CN102808589A - Motor-driven underground tractor for coiled tubing - Google Patents
Motor-driven underground tractor for coiled tubing Download PDFInfo
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- CN102808589A CN102808589A CN2012102902260A CN201210290226A CN102808589A CN 102808589 A CN102808589 A CN 102808589A CN 2012102902260 A CN2012102902260 A CN 2012102902260A CN 201210290226 A CN201210290226 A CN 201210290226A CN 102808589 A CN102808589 A CN 102808589A
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Abstract
The invention belongs to the field of oil and gas field development and relates to a tractor used for drilling, logging and well repair engineering of a coiled tubing and favorable for the coiled tubing to extend into a horizontal well section for a longer distance. A motor-driven underground tractor for the coiled tubing comprises an upper tractor system, a hexagonal central sliding pipe and a lower tractor system, wherein the upper tractor system comprises an upper supporting unit, an upper electric drive and control unit and an upper traction unit; and the upper tractor system and the lower tractor system have the same structure, and are connected at the upper part and the lower part of the hexagonal central sliding pipe respectively in a sleeving way and mounted in the same or opposite direction. The tractor is directly driven and controlled by a servo stepper motor, so that the dependence on liquid energy in the process of driving the tractor by using circulating liquid and the complexity of control of a hydraulic valve of the circulating liquid on a pipeline are reduced and most of space occupied by the hydraulic pipeline is saved; and the tractor can perform dual-direction traction, is good in stability, flexible in traction and fast in traction speed, can be suitable for underground traction work of small well holes, and can guarantee normal underground liquid circulation in the traction process.
Description
Technical field
The invention belongs to the oil-gas field development field, particularly, relate to a kind of coiled tubing drilling, well logging, well workover engineering of being used for, help coiled tubing to be lowered to the tractor of longer distance at net horizontal section.
Background technology
Because the coiled tubing purposes is very extensive: can be used to do to clean pipeline flushing sand plug, wax removal, selective acidizing, gaslift ask products, squeeze method shutoff, kill-job, underbalance perforating, well testing, displacement drilling fluid, high-angle borehole logging, horizontal wellbore logging, completion, salvage, remove set the expansion type dispenser, bore plug, grinding fish, permanent installation be as producing pipe, shaft bottom shooting, little experience drilling well, secondary drilling well and intensification drilling well, casing window sidetracking, oil pipe subsidy etc., can carry out operations such as horizontal well drilling, cased hole drilling well, open hole well drilling well, intensification drilling well, slimhole drilling, small well drilling well, old well window sidetracking, under balance pressure drilling and well workover, completion; Characteristics such as coiled tubing drilling has low cost, low energy consumption, safety and environmental protection, have wide range of applications; Can improve difficulties such as old filed, " low pressure, hypotonic, low yield " three low oil-gas reservoirs and employ the development benefit of oil-gas reservoir; Especially aspect the exploration and development of unconventional gas reservoir, tight gas, shale gas and the coal bed gas etc. of China, have a wide range of applications.But coiled tubing underground work technology exists urgent problem: coiled tubing does not rotate in well when one of which, drilling well, transfers to be hampered seriously, and the pressure of the drill applies difficulty.Two, the coiled tubing down-hole is hampered, and extends the well length limited, and especially when boring high angle hole, directional well, horizontal well, deep-well, the slide problem that is hampered of coiled tubing down-hole is even more serious.For addressing these problems, the petroleum drilling and mining industry has designed multiple downhole tractor,
Downhole tractor is the down-hole crawl device, also is down-hole climbing mechanism, underground tractor, downhole tractor device people, down-hole hydraulic thruster, downhole drill bit propeller etc., is a kind of a kind of downhole tool that tractive force can be provided in the shaft bottom.Downhole tractor can be divided into roller creeping-type, crawler belt creeping-type (track-mounted) and grab three kinds of arm rest slides in telescopic formulas (step-by-step movement) by its motion principle, wherein wheeled appearance the earliest, telescopic taking second place, crawler type is the latest.The traction crawl device can be divided into continuous tubular type (Coiled Tubing Tractor), cable type (Wireline Tractor) and manage hybrid three kinds of cable continuously by its energy source.Wherein tubular type traction crawl device is connected with continuous pipe at its afterbody continuously, and ground pumps into highly pressurised liquid through continuous pipe, and the inner turbine mechanism of high pressure liquid drives traction crawl device is for whole traction crawling device provides energy.Cable type traction climbing mechanism then is to obtain energy through being connected its tail cable from ground.Pipe cable mixed traction climbing mechanism then both can pump into highly pressurised liquid through ground continuously provides energy drives, can drive through the cable transmission of electric energy again.
The later stage nineties 20th century, external many companies developed in succession can independently working in the down-hole horizontal well draw-gear (cable puller just).Through years of development; Up to the present; Representational tractor product mainly comprises: the wheeled tractor of the Well Tractor of Denmark Welltec company; The wheeled tractor of Sondex of Britain Sondex Co., Ltd; The wheeled tractor of PowerTrac Advance of Norway Maritime Well Service (MWS) company, PowerTrac INVADER crawler type tractor, the telescopic tractor of SmarTract of Britain ExproGroup company, the telescopic tractor of MaxTRAC of French Schlumberger company, the telescopic tractor of Microhole Drilling Tractor of U.S. Western Well Tool company.Wherein the telescopic tractor of Microhole Drilling Tractor of U.S. Western Well Tool company be the coiled tubing formula lean on ground high pressure drilling liquid tractor that drive, that can be used for slim-hole, the ground circulation of drilling fluid of can remaining valid during work; Remaining tractor mostly is wheeled or crawler type, and Outside Dimensions is bigger, only is applicable to large hole, connects with cable or wire rope, and electricity drives, and tractive force is less, can not carry out effective circulation of drilling fluid during work, the application of the industry that is generally limited to log well.
But no matter be the sort of tractor; As far as domestic; All taked strict technical know-how measure abroad, cause domestic research to downhole tractor also to be in the infancy: from August, 2002, the oil field, Tarim Basin is through the mode of technological cooperation; Adopt the downhole tractor technology to carry out the exploration of horizontal well industry profile logging, obtained certain effect.After this; Domestic minority scientific research institutions have also carried out the research of downhole tractor in succession; Mainly contain China University Of Petroleum Beijing, Harbin Institute of Technology, Southwest Petroleum Institute, Daqing Petroleum Institute, Xi'an Petroleum University etc.; Also applied for the patent of some tractors, but some shortcomings of these tractors existence more or less, and mostly be confined to utilize circulation fluid to compress into capable drive controlling; Directly do not carry out that tractor drives with control, can not satisfy the requirement of underground work preferably with servo step motor.
People such as the Gao Jinwei of China University Of Petroleum Beijing, Liu Meng are at document (Gao Jinwei; Liu Meng; Yan Xiangzhen. the wheeled self-adapting pipe crawl device in horizontal well down-hole: the structural concept that has proposed a kind of wheeled drag device China); And applied for utility model patent (200520008070.8.2006-08-16, sleeve pipe horizontal wellbore logging tractor reducing draw-gear); Harbin Institute of Technology also developed the wheeled drag device of a cable (Tang Dewei, Wang Xinjie, Deng Zongquan. horizontal well detecting instrument drag device. the journal .2007 of Harbin Institute of Technology, 39 (9): 1395-1397), and carried out ground experiment; The Zhu Lin of Xi'an Petroleum University, Wu Songping designed voluntarily a kind of wheeled tractor (Zhu Lin, Wu Songping. the design of horizontal wellbore logging instrument traction crawl device. new technology new technology, 2007, (12): 32-34); Liaohe Petroleum Exploration Bureau has proposed to have the wheeled tractor (200720190260.5, sleeve pipe horizontal wellbore logging tractor reducing draw-gear) of independent intellectual property right, and the underground trials that the tractor of its development carried out at the four-hole horizontal well of Liaohe Oil Field of Great Wall in 2008 probing well logging company; Also some other scientific research institutions has also carried out the research of wheeled tractor related fields; But these tractors all have some common ground: all being wheeled tractor, all is that cable connects the nothing circulation, all is that tractor is used in the little underground work of tractive force such as well logging, well workover; Therefore there are a lot of defectives; Major defect is following: (one) wheeled tractor overall structure is not compact, and outside dimension is big, only is applicable to large hole; Can not be applicable to towage under the slim hole well, it is limited in one's ability to adapt to caliber; (2) electricity that relies on cable or wire rope to connect drives, and can not effectively connect coiled tubing and drive and realize effective circulation of drilling fluid by ground hydraulic; (3) tractive force is less, only is applicable to traction logging cable or wire rope etc.; (4) major part can not realize bi-directional drive.
Shao of Daqing Petroleum Institute keep monarch, Chang Yulian proposed a kind of lock piston type walking of rising telescopic drag device (Shao Shoujun. based on the oil well fault-finding robot research of virtual prototype. the Master's thesis .2007:5 of Daqing Petroleum Institute～7) mainly by electric component, hydraulic package, go up and support the walking assembly, support walking assembly and probe assembly down and form; Through solenoid operated directional valve four hydraulic cylinders are controlled; Make upper and lower support walking assembly realize alternately stretching or withdrawal on request; Stretch out and indentation; Thereby realize independently advancing, but there is very big defective in this tractor: (one) tractive force is less, and theoretical maximum is 5000N only; Only be applicable to traction logging cable or wire rope etc., can't realize drawing coiled tubing carries out underground work; (2) supply power drive motors to make hydraulic mechanism carry out work with stube cable to electric component, the circulation of drilling fluid passage is not provided in the tractor, can't realize effective circulation of down-hole liquid and ground in the operation process; (3) support system and directive wheel partly adopt linkage, make structure not compact, and the tractor external diameter is bigger, the borehole diameter that can be suitable for be limited in scope (Φ 90-Φ 130mm).
(201110081197.2 of applications such as imitating China, Hu Zhiqiang, Shi Changshuai is wished by Southwest Petrol University; The coiled tubing crawl device and the method for creeping thereof) coiled tubing crawl device and the method for creeping thereof be made up of preceding crawling device, controller and back crawling device; Though be to adopt coiled tubing to connect; Utilize the ground hydraulic device to drive, but obviously there is weak point in this patent: two traction fluid cylinders carried out traction drive and control about (one) traction element adopted, and made traction element long; Supporting mechanism adopts single fluid cylinder to drive and spring reverse motion; Make the tractor fluid pressure line complicated, minimum suitable borehole diameter is bigger, is not suitable in slim-hole, drawing and advances; (2) the circulation pressure consumes bigger in the coiled tubing because coiled tubing underground work makes; Adopt pure hydraulic-driven and control; Tractor inside and outside differential pressure minimum value there is certain requirement; Could drive the tractor operate as normal after having only the ground pump pressure to reach certain value, make this tractor bigger to the ground pressure dependence, traction control is dumb; (3) just propose to carry out the drive controlling notion, but do not provide the pipeline embodiment of concrete hydraulic-driven and control with hydraulic pressure; (4) supporting mechanism adopts pole structure, makes that the minimum suitable borehole diameter of tractor is bigger, is not suitable for towage in slim-hole;
Summary of the invention
For overcoming the defective of prior art; The object of the present invention is to provide a kind of motor-driven coiled tubing downhole tractor; It utilizes the effective driving of four servomotors, and traction coiled tubing post is lowered to smoothly and takes out in the down-hole with the control tractor; Solved because of down-hole coiled tubing frictional resistance is bigger, be lowered to and take out technical barriers such as coiled tubing difficulty, it is longer that coiled tubing can be extended in the down-hole.
In order to achieve the above object, the present invention adopts following technical scheme:
A kind of motor-driven coiled tubing downhole tractor comprises retractor system, comprises retractor system, six side center slip pipes, following retractor system; Last retractor system and following retractor system are enclosed within the upper and lower of six side center slip pipes respectively.
Preferably, there are circulation hydrophthalmia, the outside of hollow circular to be regular hexagon in the middle of the six side center slip pipes, are respectively equipped with last traction unit correspondence position and bottom and following traction unit correspondence position on slip pipe top, six side centers and give prominence to flange, time outstanding flange; Last six side center slip pipe screw rods are given prominence on flange, the following outstanding flange last through bolts assemblies respectively with following six side center slip pipe screw rods.
Preferably, last retractor system, down the retractor system structure is identical, and the installation direction on six side center slip pipes is identical or opposite.
Preferably, last retractor system comprises support unit from top to bottom successively, driving and control module and last traction unit power on.
Preferably, last support unit comprises upper slips bearing, upper slips housing, upper slips, upper slips locking slide block, upper slips expansion link, goes up screw rod propelling slide block; The upper slips bearing is for axially having the cylinder in regular hexagon hole, and the upper slips bearing is enclosed within on the six side center slip pipes and can be in axial sliding by relative six side center slip pipes; Lower end in the regular hexagon hole of upper slips bearing has internal thread, in the outside of upper slips bearing bottom along circumferentially being evenly equipped with three upper slips bearing slide opening latch assemblies; The upper slips housing is the cylinder with regular hexagon hole, and the upper slips housing is enclosed within on the six side center slip pipes and can be in axial sliding by relative six side center slip pipes; Upper end at the upper slips housing has external screw thread, and the upper slips housing is whole through being threaded with the upper slips bearing, and is enclosed within on the six side center slip pipes, can be in axial sliding by relative six side center slip pipes; Along the circumferential direction be evenly equipped with three upper slips housing slide opening latch assemblies at the middle part of upper slips housing, upper slips housing slide opening latch assembly is corresponding up and down with upper slips bearing slide opening latch assembly; Upper slips has three, and three upper slipses circumferentially evenly distribute along the upper slips housing, and the upper slips upper end is connected with the upper slips bearing through upper slips bearing slide opening latch assembly, and the upper slips lower end is connected with the upper slips housing through upper slips housing slide opening latch assembly; Upper slips bearing slide opening and upper slips housing slide opening are elongated hole, thereby make upper slips slide opening latch when opening and shrink in elongated hole, have certain axial displacement space; Upper slips housing circumferencial direction outside evenly is provided with three chutes vertically; The lower end of chute is provided with upper slips expansion link hole; The lower end in upper slips expansion link hole is provided with screw rod and advances the slide block cavity; Last screw rod advances slide block cavity lower end to be provided with the screw rod locating hole, and last screw rod locating hole lower end is provided with screw drive rotor, upper slips drive motors module, last motor retainer ring, goes up the installation cavity of control module; Three upper slips locking slide blocks are contained in respectively in three chutes, and the lower end of upper slips locking slide block is connected with the upper slips expansion link; The upper slips expansion link is contained in the upper slips expansion link hole, and upper slips expansion link lower end advances slide block to be connected with last screw rod.
Preferably, power on to drive and comprise screw rod from top to bottom successively, go up the screw drive rotor, upper slips drive motors module, go up motor retainer ring, last control module with control module; Three last screw rods are longitudinal positioning of in three last screw rod locating holes of upper slips housing; The upper end of last screw rod and last screw rod advance slide block to be in transmission connection through screw thread; The lower end of last screw rod is connected through gear with last screw drive rotor, and upper slips drive motors module is fixedly connected and drives upward screw drive rotor; Upper slips drive motors module is fixed in the upper slips housing through last motor retainer ring, and last screw rod, last screw drive rotor, upper slips drive motors module, last motor retainer ring and last control module all are contained in the cavity of upper slips housing; The lower end of upper slips housing is provided with internal thread.
Preferably, last traction unit comprise the traction drive motor, on draw housing, on draw rotor, on draw the housing bearing; Last traction housing is the hollow circular cylinder that the upper end has hexagonal hole; Last traction housing can be in axial sliding by relative six side center slip pipes; The upper end of last traction housing has external screw thread, the lower end has radial location latch screw, on draw housing the lower end of upper end and upper slips housing through being threaded; The fixing traction drive motor of going up in upper end in the last traction housing cavity, last traction drive motor lower end connect also to drive goes up the traction rotor, on draw rotor internal cavity and be processed with and draw armature nut, on draw armature nut and be connected with last six side center slip pipe screw drive; Last traction housing bearing is the hollow circular cylinder that has hexagonal hole, on draw housing bearing upper end and have radial location latch screw, on draw the housing bearing and can be in axial sliding by relative six side center slip pipes; Last traction housing lower end is connected through the radial location latch with last traction housing bearing; What of size that last control module can be through moment of torsion and revolution are controlled last traction drive motor and upper slips drive motors module.Last control module can according to the size of the positive and reverse return veer of upper slips drive motors module, rotating speed, revolution what, the size of moment of torsion respectively the slips of tractor support system is opened or closure, the speed of slips opening and closing, the degree of slips opening and closing, the size of slips support force are controlled; Last control module can according to the size of the positive and reverse return veer of last traction drive motor, rotating speed, revolution what, the size of moment of torsion respectively to traction unit on the tractor and following traction unit to go up traction and downward lead, the size of hauling speed, the size of drawing displacement, the size of tractive force are controlled.
Preferably, upper slips and upper slips locking slide block are processed with the inclined plane that cooperatively interacts, and the angle on inclined-plane can guarantee when upper slips locking slide block moves up, to slide and expand upper slips; Upper slips has certain elasticity, can under upper slips is locked the effect of slide block, expand, and is closed under the forces situation.
The present invention compared with prior art, the present invention has following advantage:
1, each directly drives through servo step motor; Reduced when utilizing circulation fluid to drive dependence to fluid power; No matter have or not the circulation fluid power, as long as can switch on, can both draw in the down-hole and creep: the tractor major side of domestic research is heavy hydraulically powered wheeled and telescopic; Higher to the hydraulic pressure dependence, the drive system more complicated;
2, directly control through servo step motor; Comprise the promptly size of slips stretching degree, grasp; The distance that traction is creeped, the size of tractive force: the directly action of control of each servo step motor; Control is simple, has reduced the complexity of utilizing circulation fluid hydraulic valve control piper, and can save the space that most of fluid pressure line occupies;
3, have in the tractor assembly on each three promptly slips become axially to be uniformly distributed with, make tractor be not easy upset, good stability;
4, traction flexibly; Hauling speed is fast: directly use the servo step motor drive controlling, and middle drive mechanism is less, makes flexibility and speed speed that tractor draws up and down largely depend on flexibility and the speed that servo step motor is controlled; And servo step motor control is relatively convenient, flexible; Speed control range is big, and therefore the tractor traction with servo step motor control is flexible, and hauling speed is fast;
5, tractor is applicable to towage under the slim hole well: the support system of domestic a lot of tractors adopts link supports structure or pipe wheeled construction; Make that minimum suitable borehole diameter is bigger; Be not suitable for the small diameter borehole towage; The support unit that tractor of the present invention adopts is an inclined-plane slip extrapolation slips expansion type structure, and support section is compact, applicable to the down-hole towage than minor diameter;
6, can guarantee normal down-hole liquid circulation in the distraction procedure: the most domestic tractor is the well logging tractor; Can not guarantee the circulation of normal drilling fluid or flushing fluid in the work; Tractor of the present invention is reserved inner cycle channel, in the underground work process, can effectively guarantee circulation of fluid.
Description of drawings
Fig. 1 looks sketch map for motor-driven coiled tubing tractor master;
Fig. 2 is a motor-driven coiled tubing tractor schematic top plan view;
Fig. 3 a be motor-driven coiled tubing tractor upper slips when opening the first half along A-A generalized section among Fig. 2;
The first half was along A-A generalized section among Fig. 2 when Fig. 3 b was motor-driven coiled tubing tractor upper slips closure;
Fig. 4 is that motor-driven coiled tubing tractor is along B-B schematic cross-section among Fig. 3;
Fig. 5 is that motor-driven coiled tubing tractor is along C-C schematic cross-section among Fig. 3;
Fig. 6 is that motor-driven coiled tubing tractor is along D-D schematic cross-section among Fig. 3;
Fig. 7 is that motor-driven coiled tubing tractor is along E-E schematic cross-section among Fig. 3;
Fig. 8 is that motor-driven coiled tubing tractor is along F-F schematic cross-section among Fig. 3;
Fig. 9 is that motor-driven coiled tubing tractor is along G-G schematic cross-section among Fig. 3;
Figure 10 a is that motor-driven coiled tubing tractor upper slips and lower slips master look sketch map;
Figure 10 b is motor-driven coiled tubing tractor upper slips and lower slips schematic top plan view;
Figure 11 a be motor-driven coiled tubing tractor lower slips when opening the latter half along A-A generalized section among Fig. 2;
The latter half was along A-A generalized section among Fig. 2 when Figure 11 b was motor-driven coiled tubing tractor lower slips closure;
Figure 12 a is a retractor system and the main downwards sketch map of looking of following retractor system installation direction on the motor-driven coiled tubing tractor;
Figure 12 b is a retractor system and the main relatively sketch map of looking of following retractor system installation direction on the motor-driven coiled tubing tractor;
Figure 12 c is a retractor system and the upwards main sketch map of looking of following retractor system installation direction on the motor-driven coiled tubing tractor.
Among the figure: 1, go up retractor system, 2, six side center slip pipes, 3, retractor system down; 11, go up support unit, 12, powering on drives and control module, 13, go up traction unit; 21, last six side center slip pipe screw rods, 22, last outstanding flange, 23, six side center slip pipe screw rods down, 24, outstanding flange down; 31, following support unit, 32, electricity drives and control module down, 33, traction unit down; 111, upper slips bearing, 112, upper slips bearing slide opening latch assembly, 113, internal thread; 114, upper slips housing, 115, upper slips, 116, upper slips locking slide block; 117, upper slips expansion link, 118, upper slips housing slide opening latch assembly, 119, go up screw rod and advance slide block; 121, go up screw rod, 122, go up the screw drive rotor, 123, upper slips drive motors module, 124, go up the motor retainer ring, 125, go up control module; 131, go up the traction drive motor; 132, draw housing on, 133, on draw rotor, 134, on draw armature nut, 135, on draw the housing bearing; 311, lower slips bearing, 312, lower slips bearing slide opening latch assembly, 313, internal thread; 314, lower slips housing, 315, lower slips, 316, lower slips locking slide block; 317, lower slips expansion link, 318, lower slips housing slide opening latch assembly, 319, screw rod advances slide block down; 321, following screw rod, 322, screw drive rotor down, 323, lower slips drive motors module, 324, motor retainer ring down, 325, control module down; 331, following traction drive motor, 332, draw housing down, 333, draw rotor down, 334, draw armature nut down, 335, draw the housing bearing down.
The specific embodiment
Shown in Fig. 1-2, motor-driven coiled tubing downhole tractor comprises retractor system 1, six side center slip pipes 2, retractor system 3 down; Last retractor system 1 and following retractor system 3 are enclosed within the upper and lower of six side center slip pipes 2 respectively.
Shown in Fig. 1-3; There are circulation hydrophthalmia, the outside of hollow circular to be regular hexagon in the middle of the six side center slip pipes 2, are respectively equipped with last traction unit 13 correspondence positions and bottom and following traction unit 33 correspondence positions on slip pipe top, six side centers and give prominence to flange 22, time outstanding flange 24; Last six side center slip pipe screw rods 21 and six side center slip pipe screw rods 23 down respectively through bolts assemblies on last outstanding flange 22, following outstanding flange 24; Coiled tubing under six side center slip pipes, the 2 upper end connection well, the lower end connects bottom hole assemblies.
As shown in Figure 1, last retractor system 1 comprises support unit 11 from top to bottom successively, powering on drives and control module 12 and last traction unit 13.
Like Fig. 1, Fig. 3, shown in Figure 4, last support unit 11 comprises upper slips bearing 111, upper slips housing 114, upper slips 115, upper slips locking slide block 116, upper slips expansion link 117, goes up screw rod propelling slide block 119; Like Fig. 2, shown in Figure 3, upper slips bearing 111 is for axially having the cylinder in regular hexagon hole, and upper slips bearing 111 is enclosed within on the six side center slip pipes 2 and can be in axial sliding by relative six side center slip pipes 2; Lower end in the regular hexagon hole of upper slips bearing 111 has internal thread 113, in the outside of upper slips bearing 111 bottoms along circumferentially being evenly equipped with three upper slips bearing slide opening latch assemblies 112; Like Fig. 3, shown in Figure 4, upper slips housing 114 is for having the cylinder in regular hexagon hole, and upper slips housing 114 is enclosed within on the six side center slip pipes 2 and can be in axial sliding by relative six side center slip pipes 2; Upper end at upper slips housing 114 has external screw thread, and upper slips housing 114 is whole through being threaded with upper slips bearing 111, and is enclosed within on the six side center slip pipes 2, can be in axial sliding by relative six side center slip pipes 2.Like Fig. 2, Fig. 3, shown in Figure 4, along the circumferential direction be evenly equipped with three upper slips housing slide opening latch assemblies 118 at the middle part of upper slips housing 114, upper slips housing slide opening latch assembly 118 is corresponding about in the of 112 with upper slips bearing slide opening latch assembly; Upper slips 115 has three; Three upper slipses 115 circumferentially evenly distribute along the upper slips housing; Upper slips 115 upper ends are connected with upper slips bearing 111 through upper slips bearing slide opening latch assembly 112, and upper slips 115 lower ends are connected with upper slips housing 114 through upper slips housing slide opening latch assembly 118; Upper slips bearing slide opening and upper slips housing slide opening are elongated hole, thereby make upper slips 115 slide opening latch when opening and shrink in elongated hole, have certain axial displacement space.Like Fig. 3, Fig. 6, shown in Figure 7; Upper slips housing 114 circumferencial direction outside evenly is provided with three chutes vertically; The lower end of chute is provided with upper slips expansion link hole; The lower end in upper slips expansion link hole is provided with screw rod and advances the slide block cavity, and last screw rod advances slide block cavity lower end to be provided with the screw rod locating hole, and last screw rod locating hole lower end is provided with screw drive rotor 122, upper slips drive motors module 123, last motor retainer ring 124, goes up the installation cavity of control module 125; Three upper slips locking slide blocks 116 are contained in respectively in three chutes, and the lower end of upper slips locking slide block 116 is connected with upper slips expansion link 117; Upper slips expansion link 117 is contained in the upper slips expansion link hole, and upper slips expansion link 117 lower ends advance slide block 119 to be connected with last screw rod.
Like Fig. 3, Fig. 8, shown in Figure 9, powering on to drive with control module 12 comprises screw rod 121 from top to bottom successively, goes up screw drive rotor 122, upper slips drive motors module 123, goes up motor retainer ring 124, last control module 125; Three last screw rods 121 are longitudinal positioning of in three last screw rod locating holes of upper slips housing 114; The upper end of last screw rod 121 and last screw rod advance slide block 119 to be in transmission connection through screw thread; The lower end of last screw rod 121 and last screw drive rotor 122 are connected through gear, and upper slips drive motors module 123 is fixedly connected also to drive and goes up screw drive rotor 122; Upper slips drive motors module 123 is fixed in the upper slips housing through last motor retainer ring 124, last screw rod 121, goes up screw drive rotor 122, upper slips drive motors module 123, goes up motor retainer ring 124 and last control module 125 all is contained in the cavity of upper slips housing 114.The lower end of upper slips housing 114 is provided with internal thread.
Like Fig. 1, shown in Figure 3, last traction unit 13 comprise traction drive motor 131, on draw housing 132, on draw rotor 133, on draw housing bearing 135.
Like Fig. 3, Fig. 7, Fig. 8, shown in Figure 9; Last traction housing 132 has the hollow circular cylinder of hexagonal hole for the upper end; Last traction housing 132 can be in axial sliding by relative six side center slip pipes 2; The upper end of last traction housing 132 has external screw thread, the lower end has radial location latch screw, on draw housing 132 the lower end of upper end and upper slips housing 114 through being threaded; The fixing traction drive motor 131 of going up in upper end in the last traction housing cavity; Last traction drive motor 131 lower ends connect and drive goes up traction rotor 133; Last traction rotor 133 inner chambers are processed with traction armature nut 134, on draw armature nut 134 and be in transmission connection with last six side center slip pipe screw rods 21; Last traction housing bearing 135 is the hollow circular cylinder that has hexagonal hole; Last traction housing bearing 135 upper ends have the radial location latch screw corresponding with the upper end radial location latch screw of last traction housing 132, on draw housing bearing 135 and can be in axial sliding by relative six side center slip pipes 2; Last traction housing 132 lower ends are connected through radial location latch screw with last traction housing bearing 135.
As shown in Figure 3, what of size that last control module 125 can be through moment of torsion and revolution are controlled with upper slips drive motors module 123 last traction drive motor 131.
Like Fig. 3, Figure 10, shown in Figure 11, upper slips 115 is processed with the inclined plane that cooperatively interacts with upper slips locking slide block 116, and the angle on inclined-plane can guarantee when upper slips locking slide block 116 moves up, to slide and expand upper slips 115; Upper slips has certain elasticity, can under upper slips is locked the effect of slide block 116, expand, and is closed under the forces situation.
Following trailer system 1 is identical with last trailer system 3 structures, does brief description below.
As shown in Figure 1, following retractor system 3 comprises support unit 31 from top to bottom successively, electricity drives and control module 32 and following traction unit 33 down.
Like Fig. 1, shown in Figure 12, following support unit 31 comprises lower slips bearing 311, lower slips housing 314, lower slips 315, lower slips locking slide block 316, lower slips expansion link 317, screw rod advances slide block 319 down.Like Fig. 1, Fig. 2, shown in Figure 12, lower slips bearing 311 is for axially having the cylinder in regular hexagon hole, and lower slips bearing 311 is enclosed within on the six side center slip pipes 2 and can be in axial sliding by relative six side center slip pipes 2; Upper end in the regular hexagon hole of lower slips bearing 311 has internal thread 313, in the outside of lower slips bearing 311 upper ends along circumferentially being evenly equipped with three lower slips bearing slide opening latch assemblies 312.
Shown in Figure 12, lower slips housing 314 is for having the cylinder in regular hexagon hole, and lower slips bearing 311 is enclosed within on the six side center slip pipes 2 and can be in axial sliding by relative six side center slip pipes 2; Lower end at lower slips housing 314 has external screw thread, and lower slips housing 314 is whole through being threaded with lower slips bearing 311, and is enclosed within on the six side center slip pipes 2, can be in axial sliding by relative six side center slip pipes 2.
Shown in Figure 12, along the circumferential direction be evenly equipped with three lower slips housing slide opening latch assemblies 318 at the middle part of lower slips housing 314, lower slips housing slide opening latch assembly 318 is corresponding about in the of 312 with lower slips bearing slide opening latch assembly; Lower slips 315 has three; Three lower slipses 315 circumferentially evenly distribute along the lower slips housing; Lower slips 315 lower ends are connected with lower slips bearing 311 through lower slips bearing slide opening latch assembly 312, and lower slips 315 upper ends are connected with lower slips housing 314 through lower slips housing slide opening latch assembly 318; Lower slips bearing slide opening and lower slips housing slide opening are elongated hole, so that lower slips 315 slide opening latch when opening and shrink has certain axial displacement space in elongated hole.
Shown in figure 12; Lower slips housing 314 circumferencial direction outside evenly is provided with three chutes vertically; Be provided with lower slips expansion link hole in the upper end of chute; The upper end in lower slips expansion link hole is provided with down screw rod and advances slide block 316 cavitys, and following screw rod advances slide block cavity upper end to be provided with down the screw rod locating hole, and the upper end of following screw rod locating hole is provided with down screw drive rotor 322, lower slips drive motors module 323, motor retainer ring 324, following control module 325 are installed cavity down; Three lower slips locking slide blocks 316 are contained in respectively in three chutes, and the upper end of lower slips locking slide block 316 is connected with lower slips expansion link 317; Lower slips expansion link 317 is contained in the lower slips expansion link hole, and lower slips expansion link 317 upper ends advance slide block 319 to be connected with following screw rod.
Like Fig. 2, shown in Figure 12, following electric driving comprises screw rod 321, following screw drive rotor 322, lower slips drive motors module 323, following motor retainer ring 324, following control module 325 down from top to bottom successively with control module 32; Three following screw rods 321 are longitudinal positioning of in three following screw rod locating holes of lower slips housing 314; The lower end of following screw rod 321 and following screw rod propelling slide block 319 are in transmission connection through screw thread; The upper end of following screw rod 321 and following screw drive rotor 322 are connected through gear, and lower slips drive motors module 323 is fixedly connected and also drives screw drive rotor 322 down; Lower slips drive motors module 323 is fixed in the lower slips housing through following motor retainer ring 324, following screw rod 321, down screw drive rotor 322, lower slips drive motors module 323, motor retainer ring 324 and following control module 325 all are contained in the cavity of lower slips housing 314 down.
Like Fig. 1, Fig. 2, shown in Figure 12, following traction unit 33 comprise down traction drive motor 331, down draw housing 332, down draw rotor 333, draw housing bearing 335 down.
Shown in figure 12, following traction housing 332 has the hollow circular cylinder of hexagonal hole for the lower end, and following lower end of drawing housing 332 has external screw thread, the upper end has internal thread, and following traction housing 332 can be in axial sliding by relative six side center slip pipes 2; The lower end of drawing housing 332 down and the upper end of lower slips housing 314 are through being threaded; Draw the fixing traction drive motor 331 down in lower end in the housing cavity down; Following traction drive motor 331 upper ends connect and drive draws rotor 333 down; Under draw rotor 333 inner chambers and be processed with down traction armature nut 334, following traction armature nut 334 and time six side center slip pipe screw rods 23 are in transmission connection; Draw housing bearing 335 down for having the hollow circular cylinder of hexagonal hole, the upper end of following traction housing bearing 335 has radial location latch screw, and following traction housing bearing 335 can be in axial sliding by relative six side center slip pipes 2; Under draw housing 332 upper ends and following traction housing bearing 335 and be connected through the radial location latch.
Shown in figure 12, what of size that following control module 325 can be through moment of torsion and revolution are controlled with lower slips drive motors module 323 traction drive motor 331 down.
Like Figure 10, shown in Figure 11, lower slips 315 is processed with the inclined plane that cooperatively interacts with lower slips locking slide block 316, and the angle on inclined-plane can guarantee when lower slips locking slide block 316 moves down, to slide and expand lower slips 315; Lower slips has certain elasticity, can under lower slips is locked the effect of slide block 316, expand, and is closed under the forces situation.
The motion state of motor-driven coiled tubing downhole tractor of the present invention can be controlled with following control module 325 last control module 125 respectively by ground input instruction, and its control principle is following:
(1), goes up retractor system 1 control principle: after upward control module 125 receives ground signal; Can drive upper slips drive motors module 123 forward or reverse; Screw drive rotor 122 and last screw rod 121 forward or reverse in the drive; Advance the screw rod slide block mechanism lead-screw of slide block 119 to advance slide block 119 to advance or retreat through last screw rod 121 and last screw rod; Screw rod advances slide block 119 to advance through upper slips expansion link 117 promotion upper slips locking slide blocks 116 or retreats, and when slips locking slide block 116 advances, through scalene cone extrapolation upper slips 115 elastic deformation takes place; And along upper slips bearing slide opening and the slip of upper slips housing slide opening; Make it open the promptly borehole wall, the size of tensile force can be controlled through the moment of torsion of drive motors module 123, and open degree can be controlled by the number of turns and angle that upper slips drive motors module 123 is rotated; When slips locking slide block 116 was retreated, slips locking slide block 116 left with the scalene cone of upper slips 115, and extrapolability disappears, and upper slips 115 is retracted to the minimum outer diameter state under the effect of self elasticity and borehole wall extruding force.After last control module 125 receives ground signal; Control is simultaneously gone up and is drawn rotor 133 in traction drive motor 131 forward or reverse, the drive and go up traction armature nut 134 forward or reverse; Through last six side center slip pipe screw rod 21 mechanisms on the six side center slip pipes 2; Retractor system 1 is done relative slip up or down along six side center slip pipes 2 in the promotion; Accomplish traction function, the size of its tractive force, displacement and direction can be respectively transfer control by the output torque of last traction drive motor 131, revolution and positive and negative.
(2), following retractor system 3 control principles: after following control module 325 receives ground signal; Can drive lower slips drive motors module 323 forward or reverse; Drive screw drive rotor 322 and following screw rod 321 forward or reverse down; Advance the screw rod slide block mechanism lead-screw of slide block 319 to advance slide block 319 to advance or retreat through screw rod 321 and last screw rod; Screw rod advances slide block 319 to advance through lower slips expansion link 317 promotion lower slips locking slide blocks 316 or retreats, and when slips locking slide block 316 advances, through scalene cone extrapolation lower slips 315 elastic deformation takes place; And along lower slips bearing slide opening and the slip of lower slips housing slide opening; Make it open the promptly borehole wall, the size of tensile force can be controlled through the moment of torsion of drive motors module 323, and open degree can be controlled by the number of turns and angle that lower slips drive motors module 323 is rotated; When under the slips locking slide block 316 when retreating, lower slips locking slide block 316 leaves with the scalene cone of lower slips 315, and extrapolability disappears, and lower slips 315 is retracted to the minimum outer diameter state under the effect of self elasticity and borehole wall extruding force.After following control module 325 receives ground signal; Traction drive motor 331 forward or reverse, drive are drawn rotor 333 down and are drawn armature nut 334 forward or reverse down under the control simultaneously; Through last six side center slip pipe screw rod 21 mechanisms on the six side center slip pipes 2; Retractor system 3 is done relative slip up or down along six side center slip pipes 2 under promoting; Accomplish traction function, the size of its tractive force, displacement and direction can be respectively transfer control by the output torque of traction drive motor 331 down, revolution and positive and negative.
(3), going up control module 125 and following control module 325 connects each other each other; Difference according to the sequencing of the course of work; There are phase difference in last control module 125 and following control module 325 to the control of each motor module, guarantee carrying out smoothly of tractor work.
(4), utilize the outside hexagon of six side center slip pipes 2 to hinder six side center slip pipes 2 and form the axial thrust force principle around the reaction that axis rotates: except that last screw drive rotor 122, on draw rotor 133 and can make the rotational by relative six side center slip pipes 2 last retractor system 1, six side center slip pipe 2; Following retractor system 3 all can not can only be slided along axis around six side center slip pipe 2 rotational, and reason is following: go up traction rotor 133 when six side center slip pipe 2 axis rotate when last traction drive motor 131 drives; Last traction rotor 133 drives goes up 134 rotations of traction armature nut; Last traction armature nut 134 drives 21 motions of last six side center slip pipe screw rods, because slip pipe 2 outsides, last six side center are six sides, and feasible last six side center slip pipes, 2 the same traction drive motors 131; Last traction housing 132; Last traction housing bearing 135, lower slips bearing 311, upper slips housing 114; Upper slips 115 grades are an integral body rotating around axis; Hindered traction armature nut 134 rotations on the last six side center slip pipes 2, the reaction of obstruction produces end thrust to last six side center slip pipe screw rods 21, draws six side center slip pipes, 2 relative slips and does axial-movement; On the contrary; If last six side center slip pipes 2 are round; Last six side center slip pipes 2 will rotate with the driving of last traction armature nut 134, on draw 134 pairs of last six side center slip pipe screw rods 21 of armature nut end thrust can't form, tractor just loses along the function of axis traction.
(5), built-in 8 core cables are accomplished transmission of electricity and wire signal transfer function: the power supply of generally going up control module 125 and following control module 325 has three kinds of modes, and a kind of is the built-in 8 core cables of coiled tubing, both can accomplish transmission of electricity, can realize the wire signal transmission again; The 2nd, the coiled tubing tube wall buries cable outward, but less so relatively; The 3rd, coiled tubing disposes multicore cable outward, accomplishes transmission of electricity function and signal transfer functions; The present invention can adopt built-in 8 core cables to accomplish transmission of electricity and wire signal transfer function.
The course of work of motor-driven coiled tubing downhole tractor of the present invention is following:
(1), original state: upward support unit 11 all is in following support unit 31 and opens the promptly borehole wall, and last retractor system 1 is in the top of six side center slip pipes 2, and following retractor system 3 is in six side center slip pipes 2 bottom.
(2), go up support unit 11 and shrink and leave the borehole wall, following support unit 31 still is in the promptly borehole wall state that opens; Last traction unit 13 and following traction unit 33 are motionless.
(3), upward traction unit 13 tractions are gone up retractor system 1 relative six side center slip pipes 2 and are moved down a distance that goes up traction armature nut 134; Move down a distance of traction armature nut 334 down with six side center slip pipes 2 of traction unit 33 tractions at present and last retractor system 1 following support unit 31 relative and that the borehole wall is fixing; Last retractor system 1 is equivalent to have moved down one along the borehole wall and goes up traction armature nut 134 length and a distance of drawing the length sum of armature nut 334 down, and six side center slip pipes 2 are equivalent to move a distance that goes up traction armature nut 134 length to the down-hole.
(4), go up support unit 11 and open the promptly borehole wall, following support unit 31 still is in the promptly borehole wall state that opens; Last traction unit 13 and following traction unit 33 are motionless.
(5), go up support unit 11 and open the promptly borehole wall, following support unit 31 shrinks and leaves the borehole wall;
(6), retractor system 3 relative six side center slip pipes 2 moved down a distance of traction armature nut 334 down under traction unit 33 drew down; Go up simultaneously traction unit 13 tractions six side center slip pipes 2 and move down a distance that goes up traction armature nut 134 with following retractor system 3 last support units 11 relative and that the borehole wall is fixing; Following retractor system 3 is equivalent to have moved down one along the borehole wall and goes up traction armature nut 134 length and a distance of drawing the length sum of armature nut 334 down, and six side center slip pipes 2 are equivalent to move a distance of traction armature nut 334 length down to the down-hole.
(7), go up support unit 11 and still be in the promptly borehole wall state that opens, following support unit 31 opens the promptly borehole wall, tractor returns to (one) original state.
Order by " (one) → (two) → (three) → (four) → (five) → (six) → (seven) → (one) " moves back and forth successively, can make tractor constantly draw the coiled tubing post and creep to the down-hole, is lowered to coiled tubing; The order of " otherwise (seven) → (six) → (five) → (four) → (three) → (two) → (one) → (seven) " moves back and forth, and can make tractor constantly draw the coiled tubing post and creep to aboveground, takes out coiled tubing.
Last retractor system, down the retractor system structure is identical, and the installation direction on six side center slip pipes is identical or opposite: both can as shown in Figure 1ly install, also can be like Figure 12 a, and 12b, 12c installs.
Claims (10)
1. a motor-driven coiled tubing downhole tractor comprises retractor system, six side center slip pipes, following retractor system; It is characterized in that: go up the upper and lower that retractor system and following retractor system are enclosed within six side center slip pipes respectively.
2. motor-driven coiled tubing downhole tractor according to claim 1 is characterized in that: go up retractor system, descend the retractor system structure identical; Last retractor system, down the installation direction of retractor system on six side center slip pipes is identical or opposite.
3. according to the described motor-driven coiled tubing of claim 1-2 downhole tractor; It is characterized in that: have circulation hydrophthalmia, the outside of hollow circular to be regular hexagon in the middle of the six side center slip pipes, be respectively equipped with last traction unit correspondence position and bottom and following traction unit correspondence position on slip pipe top, six side centers and give prominence to flange, time outstanding flange; Last six side center slip pipe screw rods are given prominence on flange, the following outstanding flange last through bolts assemblies respectively with following six side center slip pipe screw rods.
4. according to the described motor-driven coiled tubing of claim 1-3 downhole tractor, it is characterized in that: upward retractor system comprises support unit from top to bottom successively, driving and control module and last traction unit power on.
5. according to the described motor-driven coiled tubing of claim 1-4 downhole tractor, it is characterized in that: go up support unit and comprise upper slips bearing, upper slips housing, upper slips, upper slips locking slide block, upper slips expansion link, go up screw rod propelling slide block; The upper slips bearing is for axially having the cylinder in regular hexagon hole, and the upper slips bearing is enclosed within on the six side center slip pipes and can be in axial sliding by relative six side center slip pipes; Lower end in the regular hexagon hole of upper slips bearing has internal thread, in the outside of upper slips bearing bottom along circumferentially being evenly equipped with three upper slips bearing slide opening latch assemblies; The upper slips housing is the cylinder with regular hexagon hole, and the upper slips housing is enclosed within on the six side center slip pipes and can be in axial sliding by relative six side center slip pipes; Upper end at the upper slips housing has external screw thread, and the upper slips housing is whole through being threaded with the upper slips bearing, and is enclosed within on the six side center slip pipes, can be in axial sliding by relative six side center slip pipes; Along the circumferential direction be evenly equipped with three upper slips housing slide opening latch assemblies at the middle part of upper slips housing, upper slips housing slide opening latch assembly is corresponding up and down with upper slips bearing slide opening latch assembly; Upper slips has three, and three upper slipses circumferentially evenly distribute along the upper slips housing, and the upper slips upper end is connected with the upper slips bearing through upper slips bearing slide opening latch assembly, and the upper slips lower end is connected with the upper slips housing through upper slips housing slide opening latch assembly; Upper slips bearing slide opening and upper slips housing slide opening are elongated hole, thereby make upper slips slide opening latch when opening and shrink in elongated hole, have certain axial displacement space; Upper slips housing circumferencial direction outside evenly is provided with three chutes vertically; The lower end of chute is provided with upper slips expansion link hole; The lower end in upper slips expansion link hole is provided with screw rod and advances the slide block cavity; Last screw rod advances slide block cavity lower end to be provided with the screw rod locating hole, and last screw rod locating hole lower end is provided with screw drive rotor, upper slips drive motors module, last motor retainer ring, goes up the installation cavity of control module; Three upper slips locking slide blocks are contained in respectively in three chutes, and the lower end of upper slips locking slide block is connected with the upper slips expansion link; The upper slips expansion link is contained in the upper slips expansion link hole, and upper slips expansion link lower end advances slide block to be connected with last screw rod.
6. according to the described motor-driven coiled tubing of claim 1-5 downhole tractor, it is characterized in that: powering on to drive with control module comprises screw rod from top to bottom successively, goes up the screw drive rotor, upper slips drive motors module, goes up motor retainer ring, last control module; Three last screw rods are longitudinal positioning of in three last screw rod locating holes of upper slips housing; The upper end of last screw rod and last screw rod advance slide block to be in transmission connection through screw thread; The lower end of last screw rod is connected through gear with last screw drive rotor, and upper slips drive motors module is fixedly connected and drives upward screw drive rotor; Upper slips drive motors module is fixed in the upper slips housing through last motor retainer ring, and last screw rod, last screw drive rotor, upper slips drive motors module, last motor retainer ring and last control module all are contained in the cavity of upper slips housing; The lower end of upper slips housing is provided with internal thread.
7. according to the described motor-driven coiled tubing of claim 1-6 downhole tractor, it is characterized in that: go up traction unit comprise the traction drive motor, on draw housing, on draw rotor, on draw the housing bearing; Last traction housing is the hollow circular cylinder that the upper end has hexagonal hole; Last traction housing can be in axial sliding by relative six side center slip pipes; The upper end of last traction housing has external screw thread, the lower end has radial location latch screw, on draw housing the lower end of upper end and upper slips housing through being threaded; The fixing traction drive motor of going up in upper end in the last traction housing cavity, last traction drive motor lower end connect also to drive goes up the traction rotor, on draw rotor internal cavity and be processed with and draw armature nut, the upper rotor part nut is connected with last six side center slip pipe screw drive; Last traction housing bearing is the hollow circular cylinder that has hexagonal hole, on draw housing bearing upper end and have radial location latch screw, on draw the housing bearing and can be in axial sliding by relative six side center slip pipes; Last traction housing lower end is connected through the radial location latch with last traction housing bearing; What, the size of moment of torsion of the size that last control module can be through positive and reverse return veer, rotating speed, revolution are controlled last traction drive motor and upper slips drive motors module.
8. according to the described motor-driven coiled tubing of claim 1-7 downhole tractor; It is characterized in that: upper slips and upper slips locking slide block are processed with the inclined plane that cooperatively interacts, and the angle on inclined-plane can guarantee when upper slips locking slide block moves up, to slide and expand upper slips; Upper slips has certain elasticity, can under upper slips is locked the effect of slide block, expand, and is closed under the forces situation.
9. according to the described motor-driven coiled tubing of claim 1-8 downhole tractor; What it is characterized in that: go up control module and control, and then respectively the slips of tractor support system is opened or closure, the speed of slips opening and closing, the degree of slips opening and closing, the size of slips support force are controlled through, the size of moment of torsion to the size of the positive and reverse return veer of upper slips drive motors, rotating speed, revolution; Last control module can be controlled through what, the size of moment of torsion to the size of the positive and reverse return veer of last traction drive motor, rotating speed, revolution, and then upwards controlling with downward lead, the size of hauling speed, the size of drawing displacement, the size of tractive force traction unit on the tractor and following traction unit respectively.
10. according to the described motor-driven coiled tubing of claim 1-9 downhole tractor, it is characterized in that: according to the difference of the sequencing of the course of work, there is phase difference in last control module to the control of last traction drive motor, upper slips drive motors module.
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