US2856006A - Subsurface packer - Google Patents

Description

y HQM. BUCK Erm. 2,856,006

oct. 14,1958- AsusuRi-zxclz PAcxER :s sheets-sheet 2 Filed Aug. 3, 1 956 FIG. 9.`

oef. 1'4, 195s Filed Aug. s, 195s Sheets-Sheet 3 MONITORQ INDICATOR |72 EQUIPMENT 3 VOLTS Y l f FIG. I3. 12 V 2 l 3 l I I3 A.- D. c.

\ SWITCH POWER 7o SUPPLY l I7! l22\ CABLE SHEATH l 2.

PRoTEcTlNG REslsToR I w /wl RELAY l74-. |7

INVENTORS.

Robert C. Rumble, vHenry M. Buck,

Beldon A. Peters, BY

ATTORNEY.

United States Patent O SUBSURFACE PACKER Henry M. Buck, Beldon A. Peters, and Robert C. Rumble, Houston, Tex., assignors, by mesne assignments, to Jersey Production Research Company Application August 3, 1956, Serial No. 602,047

12 Claims. (Cl. 166-187) This invention is directed to a surface operable packer for use in well bores and the like. More specifically the invention is directed to an electrically operated inflatable packer for use in combination with a fluid meter which is adapted to give surface indications of rate and direction of iluid ilow in well bores. This invention is also directed to an electrically operated packer which is lluid expansible and preformed to provide circumferentially spaced longitudinally extending pleats.

This device is designed to overcome inadequacies of packers adaptable for use with subsurface llowmeters. Accordingly, one object of this invention is to provide a surface operable packer for use with a subsurface ilowmeter, which is surface indicating, the packer and ilowmeter being designed to be run through tubing, whereby the packer may be selectively and controllably inated and deated and the measurement of fluid llow rate and direction may be made at any selected point in the borehole.

Another object of this invention is to provide a reversible packer pump which is adapted to inflate the packer when operated in one direction and to permit dellation of the packer when operated in a reverse direction.

For rates of ilow up to as much as 140 barrels of fluid per day the device will seal the borehole and divert all iluid ilow through the metering section of the device. For higher rates a measurable portion of the iluid ilow can be diverted through the device so that the total ilow can be derived from this measured portion. Further, the device is readily adaptable to give surface indication of the degree of pack-oil of the packer element.

Essentially, the invention consists ofa reversible electric motor, a pump, and a packer adaptable for use with a flowmeter. An electrical circuit connects the motor and the tlowmeter whereby the motor may be actuated to inflate or deflate the packer, and the ilowmeter is employed to register the rate and direction of fluid tlow.

Referring to the drawings:

Figs. l through 4 are sectional views from top to bottom, respectively, of the device of the present invention;

Fig. 5 is an enlarged `sectional View taken along the line 5 5 of Fig. 2;

Fig. 6 is a sectional view taken along the line 6 6 of Fig. 3;

Fig. 7 is an elevational view of the rotatable helical cam of Fig. 2;

Fig. 8 is a sectional View taken along the line 8 8 of Fig. 2;

Fig. 9 is a sectional view of the pump section of l Figs. 2 and 3 in packer inilating position;

Fig. 10 is an elevational view of a preferred packer for use in the device of the present invention;

Fig. l1 is a sectional View taken along the line 11 11 of Fig. l0;

Fig. 12 is an elevational view of the device of the present invention positioned in a well bore; and

Patented Oct. 14, 1958 Fig. 13 is a schematic diagram of the electrical circuitry employed in the operation of the device of the present invention.

For a clearer understanding of the elements and operation of this device, reference to the figures in greater detail will now be made.

Figs. l through 4 are sectional views illustrating from top to bottom the elements of the present device. The device consists essentially of four sections. These are a pressure sealed motor section 11, a pump section 12, a packer section 13, and a ilowmeter section 14. Section 11 (Fig. 1) consists of a hollow cylinder 15 which has connected to its upper end a fishing neck 16. This connection is pressure sealed by means of an O-ring not shown. A cable 20, consisting of an outer steel sheath 21 and an inner insulated conductor 22, is shown connected to shing neck 16. The cable 20 extends to the surface of the earth and forms part of the electrical circuit to be described later herein. The lower end of cylinder 15 is connected to a wall member 23 by means of threads 24 and a pressure seal is maintained at this connection by means of O-ring 25. Positioned in section 11 as shown is a reversible motor, such as a permanent magnet motor, 29.

A housing 30 is attached to and shouldered against wall member 23 by means of threads 32. Motor 29 is mounted in housing 30 and connected thereto by means of set screws 31. The lower end of housing 30 holds the outer race of a thrust bearing 33. A shoulder 34 formed on wall member 23 provides a stop for housing 30. A shaft 35 of motor 29 is connected to a coupling 37 by means of a pin 36. An opening in the lower end of coupling 37 is hexagonal in cross section in order to engage with the upper end of a shaft 38 which is milled to a hexagonal cross section as `shown `on its upper end. Shaft 38 extends through the inner race of thrust bearing 33 and is prevented from moving upwardly by a flange 39 formed on shaft 38. The lower end of shaft 3S below flange 39 has a reduced diameter and is provided with a milled polygonal cross section for driving a helical cam 40.

The pump section 12 consists of a cylinder 41 which is connected to wall member 23 by means of threads 42 and to a lower wall member 43 by means of threads 44. A fluid seal surrounding the lower end portion of shaft 38 consisting of a bronze bushing 50, an O-ring 51, and felt washers 52, is housed in a removable holder 45 which in turn is pressure sealed to wall member 23 by means of an O-ring 46. Grease escape ports 50a are provided in bronze bushing 50 to allow O-ring 51 to deform and cause a positive iluid seal between rotating shaft 38 and holder 45 when fluid pressure is exerted below packing 52 and O-ring 51. Holder 45 and the sealing elements 5(1 52 are maintained in position by a shaft aligning washer 48 which is held by screws 49 threaded into wall member 23.

A cylinder 53 is shown (Figs. 2, 3 and 9) screw threadedly attached to wall member 43 as at 44a and is also attached at its upper end to a cam shaft holder 54 by means of screws 54a. Cylinder 53 has formed intermediate the length thereof longitudinal `slits 55 and 55a and has formed adjacent its lower end iluid drain'ng ports S6. Cylinder 41 is provided with fluid entry and draining slits 57 positioned adjacent ports 56.

Cam shaft holder 54 contains a sleeve bearing 58 and is formed to provide a longitudinally extending port 59. A shaft 6i), attached at its upper end to helical cam 40 by means of-pin 61, may rotate freely in bearing 58. A washer 62 serves as a bearing between rotatable cam 40 and cam shaft holder 54. The upper end of cam 40 is a hollow cylinder which contains an engaging member 63 which latter member is formed with a hole having a square cross section in its upper end which is adapted to engage the lower end of shaft 38. Engaging means 63 is held in cam 40 by a pin 64 which is free to move longitudinally in yslot 65 in cam 40 and is biased upwardly by a coil spring 66 supported on the upper end of shaft 60. The lower end `of shaft 60 is connected to a pawl holder 67 by means of a pin 68.

Pawl holder 67 `carries two identical but oppositely directed pawls 69 and 70 mounted on a common pin 71, as more clearly seen in Fig. 5. Pawl biasing spring 72 is mounted on a pin 73. The lower end of pawl holder 67 spears into a bearing recess in a pawl follower 74, the bearing recess being provided with a relief slot 77. Pawl follower 74 is provided with a key 75 which projects internally from the pawl follower wall. A plurality of drain holes 76 permits drainage of any fluid or sediment that may enter pawl follower 74. The pawl follower 74 is threadedly engaged to and movable in a wall member 78 by means of threads 79. Wall member 78 is affixed to cylinder 53 by means of screws 80. The lower end of pawl follower 74 is free to rotate in a cylinder head 81 but is constrained from longitudinal movement by means -of a washer 82 positioned on the lower end of pawl follower 74.

The cylinder head 81 forms the upper end of a pump cylinder 83 and is connected thereto by means of a screw 84 which is free to move longitudinally in a slot 85 formed in cylinder 53. The lower end of pump cylinder 83 is mounted on shoulder 88 of stinger 86 and is threadedly connected to stinger 86 by means of threads 87. Stinger 86 is provided with a fluid exhaust port 89 and an O-ring 91. The upper end of stinger 86 supports a spring 92 which in turn bears against a check member 93 positioned in a port 94 formed in the lower portion of cylinder 83. This permits only downward flow through port 94 in pump cylinder 83. The piston 95 is slidably arranged in pump cylinder 83. The piston 95 is provided with a uid entry port 96, check 97, biasing spring 98, cup washer 99 and a retainer 100 which latter is threadedly connected to piston 95. Piston 95 is connected to a piston rod 102 by means of a pin 103. The piston rod 102 extends through a slit 104 formed in pump cylinder 83. Slit 104 in cylinder 83 and slit 55a in cylinder 53 are in alignment.

The upper end of piston rod 102 is attached to a cam follower wheel 105 by means of an axle 106. Cam follower wheel 105 moves in a continuous helical slot 107 in cam 40. Piston rod 102 extends through an opening in cam shaft holder 54 and moves longitudinally in a keyway 108 formed in a cylinder 109 which latter is attached at its lower end to cam shaft holder 54 (Figs. 2 and 8).

The packer section 13 consists of a tubular mandrel 115 which is preferably silver soldered to a packer stinger 116 which is pressure sealed from packer adapter 110 by means of O-ring 117. Stinger 116 shoulders against a ledge 119 formed in packer adapter 110 and the upper end thereof extends into a passageway 120 in wall member 43 where a uid seal is maintained by means of an O-ring 121. Stinger 116 is provided with a longitudinally extending passageway 123 communicating with transverse ports 124 formed in tubular mandrel 115 which` is thickwalled at its upper end and threadedly connected into the lower end of adapter 110. A plurality of longitudinally extending passageways 126 are provided throughout the length of the thick walled portion of mandrel 115 and these passageways fluidly communicate with ports 124 as seen in Figs. 3 and 6. A series of fluid inlet and outlet ports 127 extend through the upper end of mandrel 115 between the passageways 126. A plug 128 screws into the bottom of stinger 116 in line with passageway 123.

A packer 129 is mounted on mandrel 115 with its upper end clamped by clamping ring 130 and threaded nut 131 while its lower end is clamped by clamping ring 132 and threaded nut 133. The latter is threadedly mounted on sleeve 134 which is, in turn, slidable on mandrel 115. A

fluid seal is maintained between sleeve 134 and mandrel by O-ring 136. Sleeve 134 may be locked on mandrel 115 in any desired position by set screws 135. As shown in Fig. 3, passageways 126 fluidly communicate with the interior of packer 129. Packer mandrel 115 is threadedly connected to the lluid metering section 14 as at 137.

The packer 129 may consist of a preformed oil resistant rubber element having a maximum diameter approximating the diameter of the borehole wherein the flow measurement is to be made. The oil resistant rubber element may be reinforced with fabric so that it may be inflated to a definite size to form a selected sized baffle which would provide a controlled fluid bypass in the borehole when measuring large rates of flow. From a measure of the amount of well fluid being diverted through the device, the total fluid flowing in the wellbore may readily be derived. With this type of packer a small pressure release valve may be screwed into stinger 116 in the hole plugged off by plug 128. The release valve will assure that the packer is always inflated to the proper pressure.

Regardless of the variety of packer employed, protection of the packer is necessary when being run into the well. The protection may be afforded by a thin enveloping rubber sheath which has a small longitudinal slit therein. This sheath will fail and fall away when the packer enclosed by the sheath is inflated. Instead of a sheath, protection for the packer may be afforded by rubber bands positioned at random along the packer length. In this instance, ination of the packer in the well will cause these bands to slip toward the packer ends.

Although any of the indicated packer types may be used, the packer 129, as shown in Figs. l0 and ll, is preferred.

The packer element 129 is preformed of `oil resistant rubber or other elastic material to assume in its cornpletely relaxed position the shape as shown in Figs. l0 and 1l. Each end of the packer 129 is tubular in shape with a major portion of its walls forming longitudinally extending pleats 160. The pleats 160 provide for substantial enlargement of the packer without excessive stretching. A packer so formed, when mounted on a device such as the present invention in its relaxed state, does not extend outwardly beyond the nominal diameter of the device. This feature eliminates tearing of the packer element while raising or lowering the device in the borehole.

The fluid metering section 14 is the same as that described in U. S. application Serial No. 525,916 in the name of H. M. Buck, led August 8, 1955, entitled Flowmeter. Any type of flowmeter which is adapted to electrically transmit rate or direction of fluid ow or both to the earths surface may be used in combination with the motor, pump and packer of this device. However, the meter disclosed in the above-entitled application is preferred. Since this meter has been described in detail in the above-cited application, a detailed description of the elements of this apparatus is not considered necessary. The essential parts are as follows: a nose plug is connected to a cylindrical member 141 which, in turn, is screw threadedly connected to mandrel 115 at 137. The cylindrical member 141 is provided with fluid inlet ports 141a. A rotor 144 is mounted on a shaft 1440 and stator deectors 142 and 143 are mounted below and above the rotor 144, respectively. A cam 145 is formed on shaft 144:1 and a circuit spinner breaker 146 which also acts as a cam follower is positioned so as to bear against the cam 145 and is arranged to move in response to rotation of the cam 145 and to make and break contact with switch contact 146:1 in response t-o this movement. Cam 145 is designed to cause cam followeror circuit breaker 146 to make and break contact with switch contact 146:1 in one sequence when the cam rotates in one direction and in a different sequence when the cam is rotated in an opposite direction. Thus, coded signals are generated which are transmitted to the earths surface as described hereinafter. The difference in the signals indicating direction of flow through the meter and the rate at which the signals are transmitted indicating rate of fluid flow through the meter.

An electrical conductor lead 147 connects to switch contact 146a and extends through-out the length of the device and into the motor section 11 where electrical connection is made with conductor 22 as shown more clearly in the electrical circuit diagram of Fig. 13. Although conductor lead 147 is shown as one continuous lead, it is obvious that a number of slip ring connections would be included in order to threadedly assemble the various sections.

Fig. 13 shows schematically the electric circuitry involved in the operation of this device. On the surface is positioned a double pole three position switch generally designated 170, a D. C. power supply 171, and monitor and indicator equipment 172. The switch 178 alternatively connects the monitor and indicator equipment 172 and the D. C. power supply 171 in forward or reverse directions with the conductor cable 22 housed in sheath 21. The sheath is grounded as at 173. The subsurface electric circuitry connected to conductor cable 22 includes relay 174, a protecting resistor 175, permanent magnet type pump motor 29 and spinner breaker 146 suitably grounded as at 176.

As shown in position 2 of switch 170, the cable 22 is connected directly to the monitor and indicator equipment 172. In the subsurface connection the relay is not at this time energized since the voltage in the monitor and indicator equipment 172 is of a relatively small amount, for example, three volts. Hence, the spinner breaker 146 is connected through relay Contact 177, resistor 175, lead 147, directly to the cable 22. In this position the flowmeter functions as the spinner described in the Buck application noted supra. With the switch 170 in position l or 3, the D. C. power supply is connected to cable 22. This voltage being higher, for example 65 volts, actuates the relay 174 so that the applied voltage is connected to the pump motor 29 through contact 178 of relay 174. Pump motor 29 rotates shaft 38 clockwise or counterclockwise depending `on whether surface switch 170 is in position 1 or 3.

In operation, the device is lowered in the well with the packer 129 in a deflated condition and with the switch 170 in position 2, as shown in Fig. 13. At a depth at which it is desired to take a reading, vertical travel of the flowmeter is arrested. Then switch 170 is thrown to position l which actuates pump motor 29 which causes rotation of shaft 38 in one circumferential direction which in turn rotates shaft 6i) and cam 40. Rotation of cam 40 reciprocates piston rod 102 which forces fluid into the pump chamber 53a via ports 55a and 104 and check 97 and out pump chamber 53a through check 93. Also, pawl follower 74 moves downwardly on screw thread 79 in wall member 78 until pawl 69 moves over the top of key 75. This moves pump cylinder 83 downwardly carrying stinger 86 downwardly into passageway 120. O-ring 91 when positioned in passageway 120 prevents uid from passing out ports 89 and directs lluid coming from pump chamber 53a through passageways 120, 123, 124 and 126 into packer 129 to inflate the packer.

When a seal is effected by the packer 129 in the wellbore, the switch 170 is thrown back to position 2 so that a reading of the flow rate may be made on the monitor and indicator equipment 172. After the reading has been made and it is desired to retrieve the device or obtain another reading at a different depth, the packer is deflated preparatory to moving the device by positioning the switch atposition 3 for about 1/2 minute, then it is returned to position 2. This permits the packer to drain and leaves it in a condition to continue draining while raising and lowering the device. It is equally important that the packer be open to permit draining while being raised in the borehole since the decreased pressure at lesser depths in the well causes the gas in the vestige of oil remaining in the packer after deflation to break out of solution. If the packer is not in draining condition when the device is raised this liberated gas would cause expansion of the packer and thus cause damage to the packer or prevent its removal from the well. When the packer is sealed against the wellbore, any fluid flow in the well will be diverted through the metering section 14 via ports 141a and 127. When a reading or measurement of the flow reading is made, the D. C. power supply 171 is disconnected from the upper terminus of the cable 22 thereby disconnecting the pump motor 29 from the power supply. When the pump motor ceases to run, the packer remains inflated. The relay 174 when not energized will automatically connect the spinner breaker 146 in the circuit for measurement of the flow direction and rate.

When the direction of rotation of the armature of motor 29 is reversed by reversing the polarity of the D. C. supply voltage 171 by moving the switch from position 1 to position 3, the direction of rotation of pawl holder 67 is also reversed. This causes pawl 70 to engage key 75 of pawl follower 74 which in turn causes pawl follower 74 to move upwardly with respect to wall member 78 by means of the threaded connection 79 in wall member 78. This results in pump cylinder 83 being moved upwardly until the ports 89 in stinger 86 are withdrawn from passageway 120. By uncovering ports 89 the flow through the stinger from pump chamber 53a will pass outwardly through ports 89, 56 and 57. The ports 89 are uncovered after the motor 29 has run foi approximately 5 seconds in the clockwise direction afterwhich pawl 70 has slipped over the lower end of key 75. Hence, protracted running of the motor 29 in a reverse direction is not necessary to drain the packer.

Obviously, successive readings of flow rates in the well bore may be made b'y spotting the llowmeter at the desired depth and then inflating the packer, making the flow measurement and deflating the packer as described above. It is possible to employ attachments with this device to determine if the packer is being inflated or whether or not it is holding the fluid pressure. For eX- ample, it may be desirable to screw in the hole blocked by plug 128 in stinger 116 a small bellows. The bellows, when containing a certain minimum pressure, would actuate a switch which would remove a partial short circuit in the spinner breaker circuit. When properly adjusted this switch would be a means for determining if the packer is being inflated and whether or not it is holding lluid pressure.

Having described the apparatus, operation, and objects of our invention, we claim:

l. A surface operable packer comprising a longitudinally extending housing, driving means including a rotatable shaft mounted in said housing, a rotatable cylindrical cam having a helical continuous slot formed thereon ailixed to said shaft, a cam follower wheel positioned in said slot, a rotatable pawl holder connected t0 said shaft, oppositely directed pawls arranged on said pawl holder, a rst stationary wall member mounted in said housing, a longitudinally movable pawl follower` screw threadedly connected to said first wall member, said pawl follower being formed to provide a key adjacent said pawls, said pawl holder being mounted on said pawl follower, said pawls being engageable with and longitudinally slidable on said key thereby rotating said pawl follower with said pawl holder until said pawl follower moves a selected longitudinal distance whereby said pawl disengages from said key and said pawl holder rotates free of said pawl follower, a pump cylinder connected with said pawl holder for longitudinal movement therewith, said pump cylinder having first and second positions and being formed to provide upper inlet and lower outlet ports, a piston slidably arranged in said cylinder, a piston rod interconnecting said cam follower and said piston, a first valve on said piston adapted to admit fluid to said cylinder below said piston upon movement of said piston in one direction, a second valve positioned on said cylinder adapted to permit discharge of uid from said cylinder upon movement of said piston in an opposite direction, a second stationary wall member secured to said housing and formed to provide a fluid passageway, the lower end of said cylinder including said outlet ports being slidably arranged in said passageway, sealing means on said cylinder above said outlet ports whereby fluid discharge through said second valve is directed through said passageway when said cylinder is in said second position, a packer adapter connected to said second wall member, an upper packer support secured to said packer adapter, a fluid expansible packer having one end thereof secured to said upper packer support, said upper packer support being formed to provide a plurality of passageways uidly communicating with said second wall member passageway, a mandrel extending through said packer, a lower packer support slidably arranged on said mandrel, the other end of said packer being secured to said lower packer support, a D. C. power supply, electrical means interconnecting said driving means and said D. C. power supply and means in said electrical conducting means adapted to reverse the polarity of said voltage to reverse the direction of said driving means.

2. A surface operable borehole packer comprising driving means including a rotatable shaft; a longitudinally movable pump cylinder being formed to provide a pump chamber and fluid flow inlet and outlet ports, a piston slidably arranged in said chamber, a piston rod connected to said piston, means interconnecting said piston rod and said shaft adapted to reciprocate said piston rod longitudinally upon rotation of said shaft, means interconnecting said cylinder and said shaft adapted to move said cylinder a selected longitudinal distance upon rotation of said shaft, an intake valve on said piston adapted to admit iiuid to said chamber, a discharge valve on said cylinder adapted to discharge fluid from said chamber, a liuid inflatable packer, means interconnecting said packer and said cylinder adapted to direct fluid discharged from said pump to said packer to inate said packer when said cylinder is in one position and to permit fluid to discharge from the packer when said cylinder is in another position, a source of D. C. power, electrical conducting means interconnecting said driving means and said power supply, and means in said conducting means adapted to reverse the polarity of said D. C. voltage to reverse the direction of said driving means.

3. A surface operable borehole packer comprising a reversible electrical motor, a reciprocating pump cylinder having first and second positions, a piston arranged in said cylinder, a uid inflatable packer, means interconnecting said motor and said cylinder adapted to move said cylinder from said first to said second position when said motor is actuated in one direction and to move said cylinder from said second to said first position when said motor is actuated in a reverse direction, means interconnecting said motor and said piston adapted to reciprocate said piston, fluid flow control means interconnecting said cylinder and said packer adapted to direct iiuid ow from said cylinder to said packer to inflate said packer when said cylinder is in said first position and to permit deflation of said packer when said cylinder is in said second position, a source of D. C. supply, electrical conducting means interconnecting said D. C. supply and said motor, and means in said electrical conducting means adapted to reverse the polarity of said D. C. voltage to reverse said motor.

4. A surface operable packer comprising a longitudinally extending housing, driving means including a rotatable shaft mounted in said housing, a rotatable cylindrical cam having a helical continuous slot formed thereon affixed to said shaft, a cam follower wheel positioned in said slot, a rotatable pawl holder connected to said shaft, two oppositely directed pawls arranged on said pawl holder, a first stationary wall member mounted in said housing, a longitudinally movable pawl follower screw threadedly connected to said first wall member, said pawl follower being formed to provide a key adjacent said pawls, said pawl holder being mounted on said pawl follower, said pawls being engageable with and longitudinally slidable on said key thereby rotating said pawl follower with said pawl holder until said pawl follower moves a selected longitudinal distance whereby one of said pawls disengages from said key and said pawl holder rotates free of said pawl follower, a pump cylinder connected with said pawl holder for longitudinal movement therewith, said pump cylinder having first and second positions and being formed to provide upper inlet and lower outlet ports, a piston slidably arranged in said cylinder, a piston rod interconnecting said cam follower and said piston, a first valve on said piston adapted to admit uid to said cylinder below said piston upon movement of said piston in one direction, a second valve positioned on said cylinder adapted to permit discharge of fluid from said cylinder upon movement of said piston in an opposite direction, a second stationary wall member secured to said housing and formed to provide a iiuid passageway, the lower end of said cylinder including said outlet ports being slidably arranged in said passageway, sealing means on said cylinder above said outlet ports whereby fluid discharge through said second valve is directed through said passageway when said cylinder is in said second position, a packer adapter connected to said second wall member, an upper packer support secured to said packer adapter, a Huid expansible packer having one end thereof secured to said upper packer support, said upper packer support being formed to provide a plurality of passageways iiuidly communicating with said second wall member passageway, a mandrel extending through said packer, and a lower packer support slidably arranged on said mandrel, the other end of said packer being secured to said lower packer support.

5. A surface operable borehole packer comprising driving means including a rotatable shaft, a longitudinally movable pump cylinder being formed to provide a pump chamber and liuid flow inlet and outlet ports, a piston slidably arranged in said chamber, a piston rod connected to said piston, means interconnecting said piston rod and said shaft adapted to reciprocate said piston rod longitudinally upon rotation of said shaft, means interconnecting said cylinder and said shaft adapted to move said cylinder a selected longitudinal distance upon rotation of said shaft, an intake valve on said piston adapted to admit fluid to said chamber, a discharge valve on said cylinder adapted to discharge fluid from said chamber, a fluid inflatable packer, and means interconnecting said packer and said cylinder adapted to direct uid discharged from said pump to said packer to inflate said packer when said cylinder is in one position and to permit fiuid to discharge from the packer when said cylinder is in another position.

6. A surface operable borehole packer comprising a reversible motor, a reciprocating pump cylinder having first and second positions, a piston arranged in said cylinder, a fluid inflatable packer, means interconnecting said motor and said pump cylinder adapted to move said pump cylinder from said first to said second position when said motor is actuated in one direction and to move said pump cylinder from said second to said first position when said motor is actuated in a reverse direction,

means interconnecting said motor and said piston adapted to reciprocate said piston and iiuid flow control means interconnecting said pump cylinder and said packer adapted to direct Huid ow from said pump cylinder to said packer to inilate sai-d packer when said pump cylinder is in said first position and to permit deflation of said packer when said pump cylinder is in said second position.

7. A subsurface pump comprising a longitudinally extending housing, driving means including a rotatable shaft mounted in said housing, a rotatable cylindrical cam having a helical continuous slot formed thereon aflixed to said shaft, a cam follower wheel positioned in said slot, a rotatable pawl holder connected to said shaft, oppositely directed pawls arranged on said pawl holder, a first stationary wall member mounted in said housing, a longitudinally movable pawl follower screw threadedly connected to said first wall member, said pawl follower being formed to provide a key adjacent said pawls, said pawl holder being mounted on said pawl follower, said pawls being engageable with and longitudinally slidable on said key thereby rotating said pawl follower with said pawl holder until said pawl follower moves a selected longitudinal distance whereby one of sai-d pawls disengages from said key and said pawl holder rotates free of said pawl follower, a pump cylinder connected to said pawl holder for longitudinal movement therewith, said pump cylinder having rst and second positions and being formed to provide spaced apart inlet and outlet ports, a piston slidably arranged in said cylinder, a piston rod interconnecting said cam follower and said piston, a rst valve on said piston adapted to admit fluid to said cylinder below said piston upon movement of said piston in one direction, a second valve positioned on said cylinder adapted to permit discharge of fluid from said cylinder upon movement of said piston in an opposite direction, a second stationary wall member secured to said housing and formed to provide a fluid passageway, the lower end of said cylinder including said outlet ports being slidably arranged in said passageway, and sealing means on said cylinder above said outlet ports whereby fluid discharged through said second valve is directed through said passageway when said cylinder is in said second position.

S. A subsurface pump comprising driving means including a rotatable shaft, a longitudinally movable pump cylinder being formed to provide a pump chamber and iluid flow inlet and outlet ports, a piston slidably arranged in said chamber, a piston rod connected to said piston, means interconnecting said piston rod and said shaft adapted to reciprocate said piston rod longitudinally upon rotation of said shaft, means interconnecting said cylinder and said shaft adapted to move said cylinder a selected longitudinal distance upon rotation of said shaft, an intake valve on said piston adapted to admit fluid to said chamber on the intake stroke of said piston, and a discharge valve on said cylinder adapted to discharge iluid from said chamber on the discharge stroke of said piston.

9. A subsurface pump comprising a reversible motor and a reciprocating pump cylinder having first and second positions, a piston arranged in said cylinder means interconnecting said motor and said pump cylinder adapted to move said pump cylinder from said first to said second position when said motor is actuated in one direction and to move said pump cylinder from said second to said first position when said motor is actuated in a reverse direction and means interconnecting said motor and said piston adapted to reciprocate said piston.

10. A cylindrically configured fluid inflatable packer preformed to provide a plurality of circumferentially spaced apart, radially extending pleats when retracted, said pleats extending substantially the length of said packer and being formed entirely of elastic material.

1l. A surface operable packer comprising a longitudinally extending housing, driving means including a rotatable shaft mounted -in said housing, a rotatable cylindrical cam having a helical continuous slot formed thereon affixed to said shaft, a cam follower wheel positioned in said slot, a rotatable pawl holder connected to said shaft, two oppositely directed pawls arranged on said pawl holder, a first stationary wall member mounted in said housing, a longitudinally movable pawl follower screw threadedly connected to said first wall member, said pawl follower being formed to provide a key adjacent said pawls, said pawl holder being mounted on said pawl follower, said pawls being engageable with and longitiudinally slidable on said key thereby rotating said pawl follower with said pawl holder until said pawl follower moves a selected longitudinal distance whereby one of said pawls disengages from said key and said pawl holder rotates free of said pawl follower, a pump cylinder connected with said pawl holder for longitudinal movement therewith, said pump cylinder having first and second positions and being formed to provide upper inlet and lower outlet ports, a piston slidably arranged in said cylinder, a piston rod interconnecting said cam follower and said piston, a first Valve on said piston adapted to admit fluid to said cylinder below said piston upon movement of said piston in one direction, a second valve positioned on said cylinder adapted to permit discharge of fluid from said cylinder upon movement of said piston in an opposite direction, a secon-d stationary wall member secured to said housing and formed to provide a fluid passageway, the lower end of said cylinder including said outlet ports being slidably arranged in said passageway, sealing means on said cylinder above said outlet ports whereby fluid discharge through said second valve is directed through said passageway when said cylinder is in said second position, a packer adapter connected to said second wall member, an upper packer support secured to said packer adapter, a fluid expansible packer having one end thereof secured to said upper packer support, said upper packer support being formed to provide, a plurality of passageways tluidly communicating with said second wall member passageway, a mandrel extending through said packer, a lower packer support slidably arranged on said mandrel, the other end of said packer being secured to said lower packer support and means for reversing said driving means in order to reverse the direction of rotation of said rotatable shaft.

12. A surface operable borehole packer comprising driving means including a rotatable shaft, a longitudinally movable pump cylinder being formed to provide a pump chamber and fluid flow inlet and outlet ports, a piston slidably arranged in said chamber, a piston rod connected to said piston, means interconnecting said piston rod and said shaft adapted to reciprocate said piston rod longitudinally upon rotation of said shaft, means interconnecting said cylinder and said shaft adapted to move said cylinder a selected longitudinal distance upon rotation of said shaft, an intake valve on said piston adapted to admit fluid to said chamber, a discharge valve on said cylinder adapted to discharge fluid from said chamber, a fluid inflatable packer, means interconnecting said packer and said cylinder adapted to direct fluid discharged frorn said pump to said packer to inflate said packer when said cylinder is in one position and to permit uid to discharge from the packer when said cylinder is in another position and means for reversing said driving means in order to reverse the direction of rotation of said rotatable shaft.

References Cited in the le of this patent UNITED STATES PATENTS 1,539,242 Carder May 26, 1925 2,334,920 Gosline et al. Nov. 23, 1943 2,629,446 Freling et al. Feb. 24, 1953 2,654,433 Piety Oct. 6, 1953 2,681,706 Pottorf June 22, 1954

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