CN103114836A - Steam heavy oil thermal recovery equipment and method thereof - Google Patents
Steam heavy oil thermal recovery equipment and method thereof Download PDFInfo
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- CN103114836A CN103114836A CN2013100556997A CN201310055699A CN103114836A CN 103114836 A CN103114836 A CN 103114836A CN 2013100556997 A CN2013100556997 A CN 2013100556997A CN 201310055699 A CN201310055699 A CN 201310055699A CN 103114836 A CN103114836 A CN 103114836A
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Abstract
Steam heavy oil thermal recovery equipment comprises a ground device and a downhole device. The downhole device comprises at least one steam generator. The steam heavy oil thermal recovery equipment further comprises an oil pipe, a water delivering pipe and a cable, wherein the upper ends of the oil pipe, the water conveying pipe and the cable are connected with the ground device, the oil pipe, the water conveying pipe and the cable in a wellhole extend to a horizontal well section, the lower end of the oil pipe is positioned in an oil layer, and the lower ends of the water delivering pipe and the cable are respectively connected with the steam generators which are arranged above or in the oil layer. The invention further provides a method for steam heavy oil thermal recovery. Steam generated by the steam generators in an embodiment of the steam heavy oil thermal recovery equipment is directly used for heating heavy oil, temperature of the steam can be increased, recovering degree of the heavy oil is greatly improved, the steam is not required to be delivered to the oil layer section from the ground via the wellhole, so that steam leakage and heat loss during delivering are avoided. And the steam heavy oil thermal recovery equipment and the method thereof are particularly applicable to offshore oilfields and other fields with limited borders.
Description
Technical field
The present invention relates to a kind of oil production equipment, relate in particular to a kind of Apparatus for () and method therefor of steam heavy oil heat production.
Background technology
The exploitation of present heavy crude reservoir mainly contains steam soak, steam flooding substantially take thermal recovery as main, situ combustion technology, downhole electric heating technology and the present marine multielement hot fluid technology of successful Application.
The downhole electric heating technology be heating cable with the oil pipe G.I.H, contacted viscous crude around heating cable after energising, the problem that this technology exists is that power consumption is large, the scope that heat involves is little, has used at present less.
Present thermal recovery dominant technology is steam soak and steam flooding, its basic principle is for passing through heater on ground, such as the equipment such as boiler produce high-temperature steam, and be directly injected into the target zone position by oil pipe, reduce viscosity or the displacement viscous crude of viscous crude by the steam of HTHP.The steam soak exploitation is periodically to inject a certain amount of wet saturated steam in oil well, and stewing well is after a period of time, with the manufacturing process of back production after the viscous crude heating, viscosity reducing in the oil reservoir certain limit.Steam flooding is according to certain flooding pattern, injects continuously wet saturated steam with the oil recovery by heating mode of viscous crude displacement to producing well from the steam injection well.Although in the exploitation of land viscous crude field, there are a lot of problems in steam soak and steam flooding technology large-scale application:
(1) from the injection process of ground, steam may cause non-oil layer section generation vapour to alter from being leaked to non-oil layer section along journey sleeve pipe screw thread to steam along pit shaft, and vapour is emitted in serious can seeing from ground, therefore has relatively high expectations to boring completion and cementing technology;
(2) although taked many provision for thermal insulations in pit shaft, in the steam injection process, heat waste generally between 30%-40%, has caused huge energy waste;
(3) because heat waste in the steam injection process is larger, ground heat extraction by steam injection technology is restricted on the degree of depth.
(4) because the ground steam generating device is huge, at sea restricted local application the in oil field and some limits is restricted;
(5) ground heating device burning afterproduct is big for environment pollution;
(6) need in development process to adopt thermal insulation protection equipment, cause development cost to increase.
Summary of the invention
The application provides a kind of equipment of steam heavy oil heat production, comprises ground installation and downhole hardware, and described downhole hardware comprises at least one steam generator;
Described equipment also comprises oil pipe, water-supply-pipe and cable, the upper end of described oil pipe, water-supply-pipe and cable all is connected with described ground installation, described pit shaft comprises Vertical Well section, angle buildup interval and net horizontal section, described oil pipe, water-supply-pipe and cable extend to net horizontal section always in pit shaft, the lower end of described oil pipe is in oil reservoir, the lower end of described water-supply-pipe and described cable all is connected with described steam generator, described steam generator is arranged in oil reservoir top or oil reservoir, and the discharge of steam that described steam generator produces is in close oil layer section or oil reservoir.
Preferably, described equipment also comprises packer, described packer is arranged on the bottom in described Vertical Well section, and described packer becomes upper segment space and lower segment space with the spatial separation in described pit shaft, and described oil pipe, water-supply-pipe and cable pass described packer by the through hole on packer.
Preferably, described ground installation also comprises solar water heater, and described solar water heater is connected with described water-supply-pipe.
Preferably, described equipment also comprises heating pipe and circulating water pipe, described heating pipe is set in the periphery of the above described oil pipe of described packer, form the interlayer path that the stream that can supply water passes through between the outer wall of described heating pipe and described oil pipe, described heating pipe's lower end is connected above described packer with the lower end of described circulating water pipe, and described heating pipe's upper end and the upper end of circulating water pipe all are connected with described solar water heater.
Preferably, described steam generator comprises steam generator top connection, steel bushing, steam valve and at least one electrode;
Described steam generator top connection is connected and forms the vaporium of sealing by screw thread with described steel bushing, described electrode is fixed on the inwall of described steel bushing, and described steam valve is fixed on described steel bushing.
Preferably, described steam valve comprises valve ball, spring and base;
Described steam valve is provided with air inlet and venthole, and described air inlet is connected with vaporium, and the inboard of described venthole is provided with the conical surface that matches with valve ball, the one described valve ball of end precompressed of described spring is on the described conical surface, thereby form sealing, the other end of described spring contacts with base
When described valve ball left the conical surface, described venthole was connected with described air inlet.
Preferably, also be provided with screen casing in the periphery of described steam generator or have sleeve pipe, the bushing pipe of punching.
Preferably, the lower end of described oil pipe is provided with eyelet, and described eyelet is in oil reservoir.
Preferably, described equipment also comprises the pump housing that can carry the stratum viscous crude, and described oil pipe is connected with the described pump housing.
The application also provides the method for the steam heavy oil heat production of the said equipment, and the method comprises,
Steam Heating: by described water-supply-pipe, hot water or cold water are sent into the steam generator of down-hole, described steam generator utilizes electric energy that hot water or cool water heating are become steam, and being discharged near in oil layer section or oil reservoir by steam valve, thereby the viscous crude in the heating stratum;
Viscous crude is produced: the viscous crude in the stratum enters oil pipe by the eyelet of described oil pipe lower end, utilizes strata pressure to make viscous crude automatically be sprayed onto aboveground and/or uses the pump housing to extract viscous crude in the stratum.
Preferably, also comprise stewing well between the stage of described Steam Heating and viscous crude production, the method for described stewing well is: described steam valve cuts out, and the steam that the described Steam Heating stage produces continues to heat the viscous crude in the stratum.
Preferably, also comprise the step that loops successively described Steam Heating, stewing well and viscous crude production.
Preferably, also comprise steam flooding in described viscous crude manufacturing process, the method for described steam flooding is: described steam generator continues discharged steam, the peripherad producing well of energy drives viscous crude stream that utilizes steam to provide.
Preferably, described hot water is the hot water of solar water heater heating.
Preferably, also comprise delivery in interlayer path and circulating water pipe, thereby heat described oil pipe; Wherein, described equipment comprises heating pipe and circulating water pipe, described heating pipe is set in the periphery of the above described oil pipe of described packer, form the interlayer path that the stream that can supply water passes through between the outer wall of described heating pipe and described oil pipe, described heating pipe's lower end is communicated with above packer with the lower end of described circulating water pipe.
Compare with relevant technologies, the beneficial effect of the embodiment of the present invention is as follows:
(1) equipment of the steam heavy oil heat production of the embodiment of the present invention, steam generator is arranged in the top or oil reservoir of oil reservoir along horizontal segment, the viscous crude of horizontal segment is in the heatable scope of steam generator fully, the steam direct heating viscous crude that produces, can improve the temperature of steam, can give full play to the energy of thermal source, the electric energy of consumption is all for the heating viscous crude, improve viscosity reduction and the displacement effect of viscous crude, can improve significantly the recovery percent of reserves of viscous crude; Due to the steam direct heating oil reservoir that steam generator produces, holding up the well section does not need to adopt complicated thermally insulating the borehole measure, has reduced thermal loss; Moreover, do not need steam is transported to oil layer section along pit shaft from ground, thereby avoided steam from being leaked to non-oil layer section along journey sleeve pipe screw thread, the problem that causes non-oil layer section generation vapour to alter.
Can also arrange one or more steam generators according to the length of horizontal segment and the situations such as viscosity of viscous crude, can heat the viscous crude in the stratum, improve the degree of thickened oil recovery.
Due to equipment on ground or device volume less, be particularly useful for offshore oilfield and some marginal restricted places.
(2) equipment of the steam heavy oil heat production of the embodiment of the present invention, also comprise packer, and packer is arranged on the bottom in pit shaft, and packer becomes upper segment space and lower segment space with the spatial separation in pit shaft, and oil pipe, water-supply-pipe and cable pass packer.Can prevent that steam from entering the above pit shaft of packer, reduce the thermal loss of steam, make as far as possible steam be used for heating the viscous crude on stratum.
(3) equipment of the steam heavy oil heat production of the embodiment of the present invention, ground installation also comprises solar water heater, solar water heater is connected with water-supply-pipe, utilize like this solar energy on the ground cold water to be carried out preheating, then be transported in steam generator, reduced the consumption of the electric energy of steam generator.
Description of drawings
Fig. 1 is the schematic diagram of equipment of the steam heavy oil heat production of the embodiment of the present invention;
Fig. 2 and Fig. 3 are the schematic diagram of the steam generator of the embodiment of the present invention;
Fig. 4 is the schematic diagram of the steam valve of the embodiment of the present invention;
Reference numeral: 1-solar water heater, 2-water-supply-pipe, 3-circulating water pipe, 4-heating pipe, 5-oil pipe, the 6-cable, 7-packer, 8-pit shaft, 9-eyelet, the 10-steam generator, 11-steam valve, 12-cable connector, the top connection of 13-steam generator, the 14-steel bushing, 15-cable core, 16-electrode, 17-vaporium, the 18-screen casing, 19-air inlet cover, 20-fixed cover, 21-valve ball, the 22-venthole, 23-spring, 24-base, 25-transformer
The specific embodiment
Hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.Need to prove, in the situation that do not conflict, the embodiment in the application and the feature in embodiment be any combination mutually.
the equipment of the steam heavy oil heat production of the embodiment of the present invention is to realize like this, as shown in Figure 1, this equipment comprises ground installation and downhole hardware, ground installation comprises solar water heater 1 and transformer 25, downhole hardware comprises three steam generators 10, the upper end of water-supply-pipe 2 is connected with solar water heater 1, the upper end of cable 6 is connected with transformer 25, pit shaft 8 comprises the Vertical Well section, angle buildup interval and horizontal segment, oil pipe 5, water-supply-pipe 2 and cable 6 together enter pit shaft 8, and extend to net horizontal section in pit shaft 8 always, then the lower end of the lower end of water-supply-pipe 2 and cable 6 all is connected with steam generator 10, the lower end of oil pipe 5 is in oil reservoir, steam generator 10 arranges in oil reservoir along horizontal segment, three steam generators 10 are threaded with series system.
As disposable embodiment, also can arrange the steam generator 10 of other number according to the length of horizontal segment and the viscosity of viscous crude, when as relatively low in shorter when the length of horizontal segment in viscosity viscous crude, can arrange one or two steam generator 10, when long and viscosity viscous crude is relatively high when the length of horizontal segment, can arrange the steam generator 10 more than three, make steam and oil reservoir contact area maximum, greatly improve viscosity reduction and oil displacement efficiency.According to the needs of oil reservoir heating location, steam generator 10 also can be arranged on the top of oil reservoir.
Alter on 8 for fear of steam along pit shaft, bottom in pit shaft 8 arranges packer 7, packer 7 becomes upper segment space and lower segment space with the spatial separation in pit shaft 8, but packer 7 arranges a plurality of through holes that fuel feed pump 5, water-supply-pipe 2 and cable 6 pass, like this can water delivery, oil transportation and transmission of electricity, can guarantee again the sealing performance of packer.Packer 7 can adopt resistant to elevated temperatures material.
In order to reduce the power consumption of downhole steam generator 10, ground installation can also comprise solar water heater 1, and solar water heater 1 is connected with water-supply-pipe 2, can utilize like this solar water heater to carry out preheating to water, and then is transported to steam generator 10.As disposable embodiment, also make otherwise preheating water.
Steam heavy oil heat production equipment also comprises heating pipe 4 and circulating water pipe 3, heating pipe 4 is set in the periphery of the oil pipe 5 of packer more than 7, form the interlayer path that the stream that can supply water passes through between the outer wall of heating pipe 4 and oil pipe 5, heating pipe 4 lower end is connected on the top of packer 7 with the lower end of circulating water pipe 3, the upper end of heating pipe 4 upper end and circulating water pipe 3 all is connected with solar water heater 1, the solar water heater 1 of heating pipe 4 and circulating water pipe 3 has just formed circulation waterway like this, thereby can realize heating to oil pipe 5.
As shown in Figures 2 and 3, steam generator 10 comprises cable connector 12, steam generator top connection 13, steel bushing 14, cable core 15, vaporium 17, steam valve 11 and electrode 16 (number of electrodes can be determined according to the stratum the thermodynamics calculation results); Cable connector 12 passes and is fixed in steam generator top connection 13, steam generator top connection 13 is connected and forms the vaporium 17 of sealing by screw thread with steel bushing 14, cable core 15 1 ends are connected with cable connector 12, the other end is connected with electrode 16, electrode 16 is fixed on the inwall of steel bushing 14, and steam valve 11 is fixed on steel bushing 14.As disposable embodiment, according to the needs of down-hole heat, one, electrode 16 more than two or three can be set.Cable connector 12 can be selected the conventional cable connector 12 that uses, and in order to improve the application life of cable connector 12, cable connector 12 can also adopt high temperature sealing material to encapsulate.Steam generator top connection 13 and shape after steel bushing 14 is threaded, can be for sealing barrel-shaped, also can be designed to other shape.
As shown in Figure 4, steam valve 11 comprises air inlet cover 19, fixed cover 20, valve ball 21, spring 23 and base 24; Air inlet cover 19 is threaded with fixed cover 20, be provided with at least one air inlet on air inlet cover 19, be provided with venthole 22 on fixed cover 20, the inboard of venthole is provided with the conical surface that matches with valve ball 21, and an end precompressed valve ball 21 of spring 23 seals thereby form on the conical surface, the other end of spring 23 contacts with base 24, during greater than external pressure, when steam backed down valve ball, venthole formed with air inlet the gas circuit that is communicated with when the pressure of vaporium.Steam valve 11 can be fixed on the copper sheathing of steam generator 10 by screw thread, and the air inlet of steam valve 11 is connected with vaporium 17 like this, and venthole can be with discharge of steam in oil reservoir.The effect of above-mentioned steam valve 11 has two, effect is at the interior steam pressure of vaporium 17 during less than strata pressure, spring 23 is with valve ball 21 jack-up, valve ball 21 contacts with the conical surface and forms sealing, steam valve 11 cuts out, above Ground during stressor layer, the interior steam of vaporium 17 backs down valve ball 21, to the oil reservoir exhaust steam when steam pressure; Another effect is when stewing well, and steam valve 11 keeps cutting out, thereby prevents that viscous crude from entering steam generator 10.
In order to prevent that in the stratum, silt particle enters steam generator 10, also be provided with screen casing 18 in the periphery of steam generator 10, screen casing 18 can adopt in the oil field the conventional sand control screen 18 that uses, and also can adopt the sleeve pipe with punching, bushing pipe of other completion mode etc.
For the better viscous crude that extracts in the stratum, the lower end of oil pipe 5 also is provided with eyelet 9, and eyelet 9 is in oil reservoir.
Steam heavy oil heat production equipment can also comprise the pump housing, and this machine is adopted pump and can be placed in pit shaft, is connected with oil pipe 5, and after flush stage finished, viscous crude can not rise voluntarily like this, at this moment can arrive the heavy oil transportation in the stratum aboveground by the pump housing.Because steam produces and acts in oil reservoir top or oil reservoir, electric pump does not need to adopt special high temperature electric pump, and the pump housing can be selected conventional electric pump or the oil well pump etc. of using.
The using method of the equipment of above-mentioned steam heavy oil heat production is as follows:
Preheating: be at first to adopt 1 pair of cold water of solar water heater to heat, or use other device heating cold water.
Steam Heating: send into the hot water of preheating in the steam generator 10 of down-hole along water-supply-pipe 2, after electrode 16 heating, hot water becomes steam, when steam pressure surpasses strata pressure and steam valve 11 preset pressure, steam valve 11 is opened, discharge of steam is near in oil layer section or oil reservoir, thus the viscous crude in the heating stratum;
Stewing well: after Steam Heating finished, steam off valve 11, the steam that Steam Heating produces continued to heat the viscous crude in the stratum;
Viscous crude is produced: can adopt three kinds of methods, one, the viscous crude in the stratum enters oil pipe 5 by eyelet 9, thereby utilize strata pressure to make viscous crude from being sprayed onto the aboveground blowing production that realizes; If the pressure in two stratum can not make viscous crude aboveground from being sprayed onto, can directly use the pump housing to extract viscous crude in the stratum, and without the blowing production phase; Three, after end is produced in blowing, use the pump housing to extract viscous crude in the stratum, thereby improve the coefficient of mining of viscous crude.
In the viscous crude manufacturing process, formation temperature descends, in the time of can not heavy crude producing, can carry out the second Steam Heating of taking turns, stewing well and viscous crude production, when second take turns exploitation and finish after, then carry out the Steam Heating of third round, stewing well and viscous crude production, until till oil well can not exploit.
In the later stage that viscous crude is produced, continuous reduction along with formation temperature, viscous crude mobility variation, the hot water that can produce solar water heater 1 this moment, be transported to the interlayer path between heating pipe 4 and oil pipe 5, heat oil pipe 5, reduce the flow resistance of the viscous crude in oil pipe 5, and then send solar water heater 1 back to by circulating water pipe 3, can form like this pipeline of a water circulation.As disposable embodiment, also can first delivery be arrived circulating water pipe 3, then enter interlayer path heating oil pipe 5, send at last solar water heater 1 back to.Also can select other mode of heating to replace solar water heater 1.
As disposable embodiment, can not adopt the method for stewing well, complete above-mentioned preheating and Steam Heating after the stage, adopt simultaneously steam flooding in the viscous crude manufacturing process, namely in the viscous crude manufacturing process, steam generator 10 continues discharged steam, the peripherad producing well of energy drives viscous crude stream that utilizes steam to provide.
Although the disclosed embodiment of the present invention as above, the embodiment that described content just adopts for the ease of understanding the present invention is not to limit the present invention.Technician in any the technical field of the invention; under the prerequisite that does not break away from the disclosed spirit and scope of the present invention; can do any modification and variation what implement in form and on details; but scope of patent protection of the present invention still must be as the criterion with the scope that appending claims was defined.
Claims (15)
1. the equipment of a steam heavy oil heat production, comprise ground installation and downhole hardware, and described downhole hardware comprises at least one steam generator;
Described equipment also comprises oil pipe, water-supply-pipe and cable, the upper end of described oil pipe, water-supply-pipe and cable all is connected with described ground installation, described pit shaft comprises Vertical Well section, angle buildup interval and net horizontal section, described oil pipe, water-supply-pipe and cable extend to net horizontal section always in pit shaft, the lower end of described oil pipe is in oil reservoir, the lower end of described water-supply-pipe and described cable all is connected with described steam generator, described steam generator is arranged in oil reservoir top or oil reservoir, and the discharge of steam that described steam generator produces is in close oil layer section or oil reservoir.
2. equipment according to claim 1, wherein, described equipment also comprises packer, described packer is arranged on the bottom in described Vertical Well section, described packer becomes upper segment space and lower segment space with the spatial separation in described pit shaft, and described oil pipe, water-supply-pipe and cable pass described packer by the through hole on packer.
3. equipment according to claim 2, wherein, described ground installation also comprises solar water heater, described solar water heater is connected with described water-supply-pipe.
4. equipment according to claim 3, wherein, described equipment also comprises heating pipe and circulating water pipe, described heating pipe is set in the periphery of the above described oil pipe of described packer, form the interlayer path that the stream that can supply water passes through between the outer wall of described heating pipe and described oil pipe, described heating pipe's lower end is connected above described packer with the lower end of described circulating water pipe, and described heating pipe's upper end and the upper end of circulating water pipe all are connected with described solar water heater.
5. equipment according to claim 1, wherein, described steam generator comprises steam generator top connection, steel bushing, steam valve and at least one electrode;
Described steam generator top connection is connected and forms the vaporium of sealing by screw thread with described steel bushing, described electrode is fixed on the inwall of described steel bushing, and described steam valve is fixed on described steel bushing.
6. equipment according to claim 5, wherein, described steam valve comprises valve ball, spring and base;
Described steam valve is provided with air inlet and venthole, and described air inlet is connected with vaporium, and the inboard of described venthole is provided with the conical surface that matches with valve ball, the one described valve ball of end precompressed of described spring is on the described conical surface, thereby form sealing, the other end of described spring contacts with base
When described valve ball left the conical surface, described venthole was connected with described air inlet.
7. the described equipment of any one according to claim 1-6 wherein, also is provided with screen casing in the periphery of described steam generator or has sleeve pipe, the bushing pipe of punching.
8. the described equipment of any one according to claim 1-6, wherein, the lower end of described oil pipe is provided with eyelet, and described eyelet is in oil reservoir.
9. the described equipment of any one according to claim 1-6, wherein, described equipment also comprises the pump housing that can carry the stratum viscous crude, described oil pipe is connected with the described pump housing.
10. the method for the steam heavy oil heat production of the equipment as according to claim 1, the method comprise,
Steam Heating: by described water-supply-pipe, hot water or cold water are sent into the steam generator of down-hole, described steam generator utilizes electric energy that hot water or cool water heating are become steam, and being discharged near in oil layer section or oil reservoir by steam valve, thereby the viscous crude in the heating stratum;
Viscous crude is produced: the viscous crude in the stratum enters oil pipe by the eyelet of described oil pipe lower end, utilizes strata pressure to make viscous crude automatically be sprayed onto aboveground and/or uses the pump housing to extract viscous crude in the stratum.
11. method according to claim 10, wherein, also comprise stewing well between the stage of described Steam Heating and viscous crude production, the method for described stewing well is: described steam valve cuts out, and the steam that the described Steam Heating stage produces continues to heat the viscous crude in the stratum.
12. method according to claim 11 wherein, also comprises looping successively the step that described Steam Heating, stewing well and viscous crude are produced.
13. method according to claim 10, wherein, also comprise steam flooding in described viscous crude manufacturing process, the method for described steam flooding is: described steam generator continues discharged steam, the peripherad producing well of energy drives viscous crude stream that utilizes steam to provide.
14. the described method of any one according to claim 10-13, wherein, described hot water is the hot water of solar water heater heating.
15. the described method of any one according to claim 10-13 wherein, also comprises delivery in interlayer path and circulating water pipe, thereby heats described oil pipe; Wherein, described equipment comprises heating pipe and circulating water pipe, described heating pipe is set in the periphery of the above described oil pipe of described packer, form the interlayer path that the stream that can supply water passes through between the outer wall of described heating pipe and described oil pipe, described heating pipe's lower end is communicated with above packer with the lower end of described circulating water pipe.
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| CN104329067A (en) * | 2014-08-20 | 2015-02-04 | 中国石油化工股份有限公司 | Heavy oil thermal recovery process and special device thereof |
| CN105756643A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气股份有限公司 | SAGD (steam assisted gravity drainage) horizontal well system and starting method thereof |
| CN112871474A (en) * | 2021-01-13 | 2021-06-01 | 云南精一电力科技有限责任公司 | Centrifuge that possesses anti-shake direction function |
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| CN201621298U (en) * | 2009-12-16 | 2010-11-03 | 中国石油天然气股份有限公司 | Fixed pressure bleed valve |
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| CN112871474A (en) * | 2021-01-13 | 2021-06-01 | 云南精一电力科技有限责任公司 | Centrifuge that possesses anti-shake direction function |
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| Publication number | Publication date |
|---|---|
| CN103114836B (en) | 2016-03-23 |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: China Oilfield Services Limited Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: China Oilfield Services Limited Patentee before: China National Offshore Oil Corporation |
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