CN103114836B - A kind of Apparatus for () and method therefor of steam heavy oil heat production - Google Patents
A kind of Apparatus for () and method therefor of steam heavy oil heat production Download PDFInfo
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- CN103114836B CN103114836B CN201310055699.7A CN201310055699A CN103114836B CN 103114836 B CN103114836 B CN 103114836B CN 201310055699 A CN201310055699 A CN 201310055699A CN 103114836 B CN103114836 B CN 103114836B
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Abstract
An equipment for 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, described oil pipe, water-supply-pipe are all connected with described ground installation with the upper end of cable, described oil pipe, water-supply-pipe and cable extend to net horizontal section in pit shaft always, the lower end of described oil pipe is in oil reservoir, described water-supply-pipe is all connected with described steam generator with the lower end of described cable, and described steam generator is arranged on above oil reservoir or in oil reservoir.The application also provides a kind of method of steam heavy oil heat production.The steam direct heating viscous crude that steam generator in the embodiment of the present invention produces, the temperature of steam can be improved, improve the recovery percent of reserves of viscous crude significantly, steam is not needed to be transported to oil layer section along pit shaft from ground, thus the steam leakage avoided in course of conveying and thermal loss, be particularly useful for offshore oilfield and some marginal restricted places.
Description
Technical field
The present invention relates to a kind of oil production equipment, particularly relate to a kind of Apparatus for () and method therefor of steam heavy oil heat production.
Background technology
The exploitation of current heavy crude reservoir, substantially based on thermal recovery, mainly contains steam soak, steam flooding, situ combustion technology, the multielement hot fluid technology of downhole electric heating technology and at present marine successful Application.
Downhole electric heating technology is heating cable with oil pipe G.I.H, the viscous crude contacted around heating cable after energising, and this technology Problems existing is that power consumption is large, and the scope that heat involves is little, has applied less at present.
Current thermal recovery dominant technology is steam soak and steam flooding, its general principle is for pass through heater on ground, the equipment such as such as boiler produce high-temperature steam, and are directly injected into target zone position by oil pipe, reduce thick oil viscosity or displacement viscous crude by the steam of HTHP.Steam soak exploitation periodically in oil well, injects a certain amount of wet saturated steam, after stewing well a period of time, by the manufacturing process of back production after the heavy oil heating viscosity reduction in oil reservoir certain limit.Steam flooding is according to certain flooding pattern, injects wet saturated steam continuously by the oil recovery by heating mode of viscous crude displacement to producing well from steam injection well.Although in the exploitation of land viscous crude field, there is a lot of problem in steam soak and steam flooding technology large-scale application:
(1) steam is along pit shaft from the injection process of ground, and steam may be leaked to non-oil layer section from along journey sleeve pipe screw thread, and cause non-oil layer section generation vapour to alter, vapour is emitted in serious can seeing from ground, therefore requires higher to brill completion and cementing technology;
(2) although take many provision for thermal insulations in pit shaft, in steam injection process, heat waste is generally between 30%-40%, causes huge energy waste;
(3) because heat waste in steam injection process is larger, ground heat extraction by steam injection technology is restricted in the degree of depth.
(4) because ground steam generating device is huge, oil field and the restricted place application of some limits is at sea 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
This application provides a kind of equipment of steam heavy oil heat production, comprise ground installation and downhole hardware, described downhole hardware comprises at least one steam generator;
Described equipment also comprises oil pipe, water-supply-pipe and cable, described oil pipe, water-supply-pipe are all connected with described ground installation with the upper end of cable, 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 in pit shaft always, the lower end of described oil pipe is in oil reservoir, described water-supply-pipe is all connected with described steam generator with the lower end of described cable, described steam generator is arranged on above oil reservoir or in oil reservoir, and the discharge of steam that described steam generator produces is in 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 the space in described pit shaft is separated into upper part space and lower part space by described packer, 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 described oil pipe of more than described packer, the interlayer path that being formed between the outer wall of described heating pipe and described oil pipe to supply water flows through, the lower end of described heating pipe is connected above described packer with the lower end of described circulating water pipe, and the upper end of described heating pipe is all connected with described solar water heater with the upper end of circulating water pipe.
Preferably, described steam generator comprises steam generator top connection, steel bushing, steam valve and at least one electrode;
Described steam generator top connection and described steel bushing are undertaken being connected by screw thread and form the vaporium closed, and 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 inner side of described venthole is provided with the conical surface matched with valve ball, described in one end precompressed of described spring, valve ball is on the described conical surface, thus forming sealing, the other end of described spring contacts with base
When described valve ball leaves the conical surface, described venthole is connected with described air inlet.
Preferably, be also provided with screen casing in the periphery of described steam generator or there is 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 can carrying stratum viscous crude, and described oil pipe is connected with the described pump housing.
Present invention also provides the method for the steam heavy oil heat production of the said equipment, the method comprises,
Steam Heating: the steam generator by described water-supply-pipe, hot water or cold water being sent into down-hole, described steam generator utilizes electric energy that hot water or cool water heating are become steam, and being discharged in oil layer section or oil reservoir by steam valve, thus the viscous crude in formation;
Viscous crude is produced: the viscous crude in 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 use the pump housing to extract viscous crude in stratum.
Preferably, between the stage that described Steam Heating and viscous crude are produced, also comprise stewing well, the method for described stewing well is: closed by described steam valve, and the steam that the described Steam Heating stage produces continues the viscous crude in formation.
Preferably, the step that circulation is successively carried out described Steam Heating, boiled in a covered pot over a slow fire well and viscous crude production is also comprised.
Preferably, in described viscous crude manufacturing process, also comprise steam flooding, the method for described steam flooding is: described steam generator continues discharged steam, the peripherad producing well of energy drives viscous crude stream utilizing steam to provide.
Preferably, described hot water is the hot water of solar water heater heating.
Preferably, also comprise by delivery in interlayer path and circulating water pipe, thus heat described oil pipe; Wherein, described equipment comprises heating pipe and circulating water pipe, described heating pipe is set in the periphery of the described oil pipe of more than described packer, the interlayer path that being formed between the outer wall of described heating pipe and described oil pipe to supply water flows through, the lower end of described heating pipe is communicated with above packer with the lower end of described circulating water pipe.
Compared 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 along in the top that horizontal segment is arranged on oil reservoir or oil reservoir, the viscous crude of horizontal segment is in the heatable scope of steam generator completely, the steam direct heating viscous crude produced, can improve the temperature of steam, can give full play to the energy of thermal source, the electric energy of consumption is all for heating viscous crude, improve viscosity reduction and the Flooding Efficiency of viscous crude, the recovery percent of reserves of viscous crude can be improved significantly; Due to the steam direct heating oil reservoir that steam generator produces, holding up well section does not need to adopt complicated thermally insulating the borehole measure, decreases thermal loss; Moreover, do not need steam to be transported to oil layer section along pit shaft from ground, thus avoid steam and be leaked to non-oil layer section from along journey sleeve pipe screw thread, cause the problem that non-oil layer section generation vapour is altered.
One or more steam generator can also be arranged according to situations such as the length of horizontal segment and thick oil viscosities, can viscous crude in formation, 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 comprises packer, and packer is arranged on the bottom in pit shaft, and the space in pit shaft is separated into upper part space and lower part space by packer, and oil pipe, water-supply-pipe and cable are through packer.Can prevent steam from entering the pit shaft of more than packer, decrease the thermal loss of steam, make steam for the viscous crude in formation as far as possible.
(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, solar energy is utilized to carry out preheating to cold water on the ground like this, then be transported in steam generator, reduce the consumption of the electric energy of steam generator.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the equipment of the steam heavy oil heat production of the embodiment of the present invention;
Fig. 2 and Fig. 3 is 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, 6-cable, 7-packer, 8-pit shaft, 9-eyelet, 10-steam generator, 11-steam valve, 12-cable connector, the top connection of 13-steam generator, 14-steel bushing, 15-cable core, 16-electrode, 17-vaporium, 18-screen casing, 19-air inlet cover, 20-fixed cover, 21-valve ball, 22-venthole, 23-spring, 24-base, 25-transformer
Detailed description of the invention
Hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can be combined mutually.
The equipment of the steam heavy oil heat production of the embodiment of the present invention realizes 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 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 net horizontal section is extended in pit shaft 8, then the lower end of water-supply-pipe 2 is all connected with steam generator 10 with the lower end of cable 6, 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 in a series arrangement.
As disposable embodiment, also the steam generator 10 of other number can be arranged according to the length of horizontal segment and thick oil viscosity, as when the length of horizontal segment is shorter and thick oil viscosity is relatively low, one or two steam generator 10 can be arranged, when the length of horizontal segment is longer and thick oil viscosity is relatively high, the steam generator 10 of more than three can be arranged, 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.
In order to avoid steam is altered along on pit shaft 8, bottom in pit shaft 8 arranges packer 7, space in pit shaft 8 is separated into upper part space and lower part space by packer 7, packer 7 is arranged can multiple through holes of passing of fuel feed pump 5, water-supply-pipe 2 and cable 6, like this can water delivery, oil transportation and transmission of electricity, the sealing performance of packer can be ensured again.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, solar water heater can be utilized like this to carry out preheating to water, and then be 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, the interlayer path that being formed between the outer wall of heating pipe 4 and oil pipe 5 to supply water flows through, the lower end of heating pipe 4 is connected on the top of packer 7 with the lower end of circulating water pipe 3, the upper end of heating pipe 4 is all connected with solar water heater 1 with the upper end of circulating water pipe 3, the solar water heater 1 of such heating pipe 4 and circulating water pipe 3 just defines circulation waterway, thus 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 stratum the thermodynamics calculation results); Cable connector 12 passes and is fixed in steam generator top connection 13, steam generator top connection 13 and steel bushing 14 are undertaken being connected by screw thread and form the vaporium 17 closed, cable core 15 one end is 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, one, two or three above electrodes 16 can be set according to the needs of down-hole heat.Cable connector 12 can select the conventional cable connector 12 used, and in order to improve the application life of cable connector 12, cable connector 12 can also adopt high temperature sealing material to encapsulate.Shape after steam generator top connection 13 is threaded with steel bushing 14, can be barrel-shaped for what seal, 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, air inlet cover 19 is provided with at least one air inlet, fixed cover 20 is provided with venthole 22, the inner side of venthole is provided with the conical surface matched with valve ball 21, and one end precompressed valve ball 21 of spring 23 on the conical surface, thus forms sealing, the other end of spring 23 contacts with base 24, when the pressure of vaporium is greater than external pressure, when valve ball backs down by steam, venthole forms with air inlet the gas circuit be communicated with.Steam valve 11 can be fixed on the copper sheathing of steam generator 10 by screw thread, and the air inlet of such steam valve 11 is connected with vaporium 17, and venthole can by discharge of steam in oil reservoir.The effect of above-mentioned steam valve 11 has two, an effect is when in vaporium 17, steam pressure is less than strata pressure, spring 23 is by valve ball 21 jack-up, valve ball 21 contacts with the conical surface and is formed and seals, steam valve 11 cuts out, when steam pressure above Ground stressor layer time, in vaporium 17, valve ball 21 backs down by steam, to oil reservoir exhaust steam; Another effect is when stewing well, and steam valve 11 keeps cutting out, thus prevents viscous crude from entering steam generator 10.
In order to prevent silt particle in stratum from entering steam generator 10, be also provided with screen casing 18 in the periphery of steam generator 10, screen casing 18 can adopt the conventional sand control screen 18 used in oil field, also can adopt the sleeve pipe, bushing pipe etc. with punching of other completion mode.
In order to better extract the viscous crude in stratum, the lower end of oil pipe 5 is also 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 like this after flush stage terminates, viscous crude can not rise voluntarily, at this moment can by the pump housing by the heavy oil transportation in stratum to aboveground.Produce due to steam and act on above oil reservoir or in oil reservoir, electric pump does not need to adopt special high temperature electric pump, and the pump housing can select conventional use electric pump or oil well pump etc.
The using method of the equipment of above-mentioned steam heavy oil heat production is as follows:
Preheating: be first adopt solar water heater 1 pair of cold water to heat, or use other device heating cold water.
Steam Heating: the hot water of preheating is sent in the steam generator 10 of down-hole along water-supply-pipe 2, after electrode 16 heats, hot water becomes steam, when steam pressure exceedes strata pressure and steam valve 11 preset pressure, steam valve 11 is opened, discharge of steam is in oil layer section or oil reservoir, thus the viscous crude in formation;
Stewing well: after Steam Heating terminates, steam off valve 11, the steam that Steam Heating produces continues the viscous crude in formation;
Viscous crude is produced: can adopt three kinds of methods, and one, viscous crude in stratum enters oil pipe 5 by eyelet 9, utilize strata pressure to make viscous crude from being sprayed onto aboveground thus realizing blowing and produce; If the pressure in two stratum can not make viscous crude aboveground from being sprayed onto, the viscous crude in pump housing extraction stratum directly can be used, and without the blowing production phase; Three, after blowing production terminates, use the pump housing to extract viscous crude in stratum, thus improve the coefficient of mining of viscous crude.
In viscous crude manufacturing process, formation temperature decline, can not heavy crude producing time, the second Steam Heating of taking turns, stewing well and viscous crude can be carried out produce, when second takes turns after exploitation terminates, then carry out the Steam Heating of third round, stewing well and viscous crude and produce, until till oil well can not exploit.
In the later stage that viscous crude is produced, along with the continuous reduction of formation temperature, viscous crude mobility is deteriorated, the hot water that now solar water heater 1 can be produced, be transported to the interlayer path between heating pipe 4 and oil pipe 5, heating oil pipe 5, reduces 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, the pipeline of a water circulation can be formed like this.As disposable embodiment, also can first by delivery to circulating water pipe 3, then enter interlayer path heating oil pipe 5, finally send solar water heater 1 back to.Also other mode of heating can be selected to replace solar water heater 1.
As disposable embodiment, the method of stewing well can not be adopted, complete above-mentioned preheating and after the Steam Heating stage, adopt steam flooding in viscous crude manufacturing process simultaneously, namely in viscous crude manufacturing process, steam generator 10 continues discharged steam, the peripherad producing well of energy drives viscous crude stream utilizing steam to provide.
Although the embodiment disclosed by the present invention is as above, the embodiment that described content just adopts for the ease of understanding the present invention, and be not used to limit the present invention.Technician in any the technical field of the invention; under the prerequisite not departing from the spirit and scope disclosed by the present invention; any amendment and change can be done what implement in form and in details; but scope of patent protection of the present invention, the scope that still must define with appending claims is as the criterion.
Claims (13)
1. an equipment for 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, described oil pipe, water-supply-pipe are all connected with described ground installation with the upper end of cable, 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 in pit shaft always, the lower end of described oil pipe is in oil reservoir, described water-supply-pipe is all connected with described steam generator with the lower end of described cable, described steam generator is arranged on above oil reservoir or in oil reservoir, and the discharge of steam that described steam generator produces is in oil layer section or oil reservoir;
Described steam generator comprises steam generator top connection, steel bushing, steam valve and at least one electrode; Described steam generator top connection and described steel bushing are undertaken being connected by screw thread and form the vaporium closed, and described electrode is fixed on the inwall of described steel bushing, and described steam valve is fixed on described steel bushing;
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 inner side of described venthole is provided with the conical surface matched with valve ball, described in one end precompressed of described spring, valve ball is on the described conical surface, thus forming sealing, the other end of described spring contacts with base
When described valve ball leaves the conical surface, described venthole is connected with described air inlet.
2. equipment according to claim 1, wherein, described equipment also comprises packer, described packer is arranged on the bottom in described Vertical Well section, space in described pit shaft is separated into upper part space and lower part space by described packer, 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, and 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 described oil pipe of more than described packer, the interlayer path that being formed between the outer wall of described heating pipe and described oil pipe to supply water flows through, the lower end of described heating pipe is connected above described packer with the lower end of described circulating water pipe, and the upper end of described heating pipe is all connected with described solar water heater with the upper end of circulating water pipe.
5. according to the equipment in claim 1-4 described in any one, wherein, be also provided with screen casing in the periphery of described steam generator or there is sleeve pipe, the bushing pipe of punching.
6. according to the equipment in claim 1-4 described in any one, wherein, the lower end of described oil pipe is provided with eyelet, and described eyelet is in oil reservoir.
7. according to the equipment in claim 1-4 described in any one, wherein, described equipment also comprises the pump housing can carrying stratum viscous crude, and described oil pipe is connected with the described pump housing.
8. adopt a method for the steam heavy oil heat production of equipment as described in claim 1, the method comprises,
Steam Heating: the steam generator by described water-supply-pipe, hot water or cold water being sent into down-hole, described steam generator utilizes electric energy that hot water or cool water heating are become steam, and being discharged in oil layer section or oil reservoir by steam valve, thus the viscous crude in formation;
Viscous crude is produced: the viscous crude in 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 use the pump housing to extract viscous crude in stratum.
9. method according to claim 8, wherein, between the stage that described Steam Heating and viscous crude are produced, also comprise stewing well, the method for described stewing well is: closed by described steam valve, and the steam that the described Steam Heating stage produces continues the viscous crude in formation.
10. method according to claim 9, wherein, also comprises the step that circulation is successively carried out described Steam Heating, boiled in a covered pot over a slow fire well and viscous crude production.
11. methods according to claim 8, wherein, in described viscous crude manufacturing process, also comprise steam flooding, the method for described steam flooding is: described steam generator continues discharged steam, the peripherad producing well of energy drives viscous crude stream utilizing steam to provide.
12. methods according to Claim 8 in-11 described in any one, wherein, described hot water is the hot water of solar water heater heating.
13. methods according to Claim 8 in-11 described in any one, wherein, also comprise by delivery in interlayer path and circulating water pipe, thus heat described oil pipe; Wherein, described equipment comprises heating pipe and circulating water pipe, described heating pipe is set in the periphery of the described oil pipe of more than packer, the interlayer path that being formed between the outer wall of described heating pipe and described oil pipe to supply water flows through, the lower end of described heating pipe is communicated with above packer with the lower end of described circulating water pipe.
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| CN104329067B (en) * | 2014-08-20 | 2018-06-01 | 中国石油化工股份有限公司 | A kind of heavy crude heat extraction technique and its dedicated unit |
| CN105756643B (en) * | 2014-12-17 | 2019-10-11 | 中国石油天然气股份有限公司 | A kind of SAGD horizontal well system and its starting method |
| 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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| US8875788B2 (en) * | 2010-04-09 | 2014-11-04 | Shell Oil Company | Low temperature inductive heating of subsurface formations |
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| US5623576A (en) * | 1993-07-26 | 1997-04-22 | Meshekow Oil Recovery Corporation | Downhole radial flow steam generator for oil wells |
| 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 |
| CN102213089A (en) * | 2011-06-02 | 2011-10-12 | 中国石油天然气股份有限公司 | Method and system for extracting oil from shallow heavy oil reservoir |
| CN202266239U (en) * | 2011-10-08 | 2012-06-06 | 中国石油化工股份有限公司胜利油田分公司孤岛采油厂 | Special check valve for thermal recovery wellhead |
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| CN202483541U (en) * | 2012-03-28 | 2012-10-10 | 周志斌 | Oil production system for heavy oil reservoir |
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