An injection-production integrated hydraulic-driven heavy oil recovery system

Abstract

The present invention relates to a mining system, specifically to an integrated injection-production hydraulic-driven heavy oil mining system. The mining system includes a power fluid injection pump, an oil storage tank, a steam injection pump, a casing, a heat-insulating oil pipe, a coiled tubing, a turbine assembly and a centrifugal pump assembly. The top end of the turbine assembly is communicated with the outlet of the power fluid injection pump through the coiled tubing and a connecting pipe; the bottom end of the turbine assembly is communicated with the inlet of the power fluid injection pump through the annulus between the heat-insulating oil pipe and the casing; the top end of the centrifugal pump assembly is communicated with the steam injection pump or the oil storage tank through the annulus between the heat-insulating oil pipe and the coiled tubing. The mining system separates steam and heavy oil from the power fluid, ensuring no pollution to the heavy oil; can counteract the downward force generated by the centrifugal pump assembly on the main shaft to ensure normal operation; can maintain sealing while withstanding higher temperatures and pressures; and solves the problem that the power fluid is prone to cause oil reservoir pollution.

Description

Technical Field

[0001] The present invention relates to a mining device, and more particularly to an integrated injection-production hydraulic-driven heavy oil mining system. Background Art

[0002] In the exploitation of heavy oil fields, due to the characteristics of high viscosity, high density, and poor fluidity of heavy oil, steam huff and puff or steam flooding methods are usually adopted for exploitation. The principle is to inject high-temperature (350°C) and high-pressure (21 MPa) steam into the heavy oil layer to increase the temperature of the oil layer, decrease the viscosity, and increase the fluidity, facilitating exploitation.

[0003] Submersible pump systems are usually used in the exploitation of heavy oil wells to lift oil from underground reservoir formations to the ground. In this application, electric submersible pumps are often used for exploitation. Due to the limitation of the temperature resistance grade of the cable, two strings of pipes are required for injection and production during the exploitation process. And when oil production is carried out at temperatures exceeding 200°C, because electronic components such as motors in the electric submersible pump and bearings lubricated with conventional lubricating oil are difficult to adapt to such a high-temperature environment, the existing electric submersible pumps still have certain limitations for the high-temperature exploitation of heavy oil.

[0004] A hydraulic submersible pump pressurizes the power fluid on the ground, injects the power fluid into the well by an injection pump to drive the turbine to rotate, and then drives the downhole centrifugal pump to rotate, lifting the downhole liquid to the wellhead through the oil pipe. The hydraulic submersible pump has no downhole motor, electrical components such as cables, and no friction bearings. It has a simple structure, only mechanical components such as turbines, impellers, and shafts, and will not require a pump inspection due to the damage of electrical components, with high reliability and can operate stably at high temperatures. Due to the unique structure and power form of the hydraulic submersible pump, its pump system is very different from that of ordinary electric submersible pumps. The working forms of the hydraulic submersible pump are open-loop and closed-loop. In the open-loop mode, the power fluid and the reservoir fluid are mixed in the oil pipe and lifted to the wellhead, and the mixed return fluid is separated by a separator on the wellhead; in the closed-loop mode, the power fluid and the reservoir fluid each form a set of circulation pipelines, and the power fluid and the reservoir fluid do not affect each other.

[0005] The patent application with the publication number CN112922846A discloses a hydraulic submersible pump for lifting bottom heavy oil during thermal recovery in oil fields, which includes: an oil outlet casing, a steam inner pipe, a power fluid inner pipe, a turbine pump, a centrifugal pump, a first pipe joint, a first switch sleeve connection assembly, a production oil flow-through sleeve, a steam delivery pipeline, a tail pipe, a second switch sleeve connection assembly, and a static pressure thrust bearing. The submersible pump of the present invention uses the power fluid as the power for the turbine pump and the centrifugal pump, which is a mechanical drive rather than the existing motor drive. Therefore, electrical components are eliminated, with high reliability and long service life; and a static pressure thrust bearing is used, greatly improving the axial load-bearing capacity of the submersible pump; at the same time, this submersible pump can realize the integration of injection and production for offshore heavy oil exploitation, and uses the power fluid as the lubricating fluid for the bearings, overcoming the disadvantages of electric submersible pumps, other types of bearings, and lubricating oils not being resistant to high temperatures.

[0006] During the process of lifting heavy oil at the bottom of the well, after the power fluid passes through the turbine, it flows back to the surface pump through the power fluid return port, the first steam flow channel, and the steam inlet flow channel. The power fluid will remain in the first steam flow channel and the steam inlet flow channel. When steam is introduced again, the steam will carry the power fluid into the downhole oil layer. Therefore, the power fluid is likely to cause oil layer pollution and affect the quality of heavy oil.

[0007] Therefore, it is necessary to improve it to solve the problem of oil layer pollution. Summary of the Invention

[0008] The purpose of the present invention is to provide, in view of the deficiencies of the prior art, an integrated injection-production hydraulic-driven heavy oil production system that isolates the flow channels of the power fluid, steam, and heavy oil, so that the power fluid is not easily introduced into the oil layer and does not easily pollute the oil layer.

[0009] The technical solution of the present invention is as follows:

[0010] An integrated injection-production hydraulic-driven heavy oil production system, which consists of a surface mechanism, a coiled tubing, a heat-insulating oil pipe, a casing, and a hydraulic submersible pump. The surface mechanism includes a power fluid injection pump, an oil storage tank, and a steam injection pump; the coiled tubing is sleeved with a heat-insulating oil pipe, and the heat-insulating oil pipe is sleeved with a casing; the bottom end of the coiled tubing is connected with a hydraulic submersible pump; the hydraulic submersible pump is composed of a turbine assembly and a centrifugal pump assembly. The centrifugal pump assembly is arranged below the turbine assembly. Its characteristics are that the top end of the turbine assembly is connected to the outlet of the power fluid injection pump through the coiled tubing and a connecting pipe; the bottom end of the turbine assembly is connected to the inlet of the power fluid injection pump through the annulus between the heat-insulating oil pipe and the casing and a connecting pipe; the bottom end of the centrifugal pump assembly extends below the heat-insulating oil pipe, and the top end of the centrifugal pump assembly is connected to the steam injection pump or the oil storage tank through the annulus between the heat-insulating oil pipe and the coiled tubing and a connecting pipe.

[0011] The turbine assembly is composed of an upper housing, a main shaft, and a turbine. The main shaft is arranged in the upper housing, and the turbine is arranged on the main shaft in the upper housing; the upper housing is connected to the coiled tubing through an upper joint.

[0012] The centrifugal pump assembly is composed of a lower housing, a pump housing, and an impeller. The pump housing is arranged in the lower housing, the impeller is arranged in the pump housing, and the impeller is connected to the main shaft extending into the pump housing; the lower housing is threadedly connected to the upper housing.

[0013] The bottom end of the heat-insulated oil pipe is provided with a nipple. On the inner wall of the nipple, an upper sealing flange, a middle sealing flange and a lower sealing flange are successively arranged from top to bottom. Liquid outlet holes are respectively arranged on the upper sealing flange and the middle sealing flange. Injection and production channels are arranged on the upper sealing flange between the liquid outlet holes and on the end face of the middle sealing flange; the upper sealing flange and the middle sealing flange are respectively and hermetically connected with the upper shell through a metal sealing mechanism; the lower sealing flange is hermetically connected with the lower shell through a metal sealing mechanism; the bottom end of the nipple is hermetically connected with the casing through a packer.

[0014] A positioning block is arranged on the top end face of the upper sealing flange. A spiral groove is arranged on the nipple above the positioning block; a positioning flange is arranged on the upper shell. The positioning flange abuts against and is connected with the upper sealing flange and is clamped with the positioning block and the spiral groove.

[0015] The metal sealing mechanism is composed of a metal sealing ring, an annular spring and a disc spring. The outer wall of the metal sealing ring is hoop-shaped with the annular spring, and a disc spring is arranged at the bottom of the metal sealing ring.

[0016] The metal sealing structure is composed of a metal bellows, an elastic lining and a metal coating. An elastic lining is arranged on the end face of the metal bellows, and a metal coating is arranged on the elastic lining.

[0017] An upper bearing seat is fixedly installed in the upper shell at the top end of the main shaft. The top end of the main shaft is threadedly installed with an upper balance drum. The top of the upper balance drum is connected with the upper bearing seat through a thrust bearing; an upper sliding sleeve is sleeved on the main shaft at the bottom of the upper balance drum. The upper sliding sleeve is connected with the turbine through an upper limit sleeve; a collar is threadedly installed on the upper bearing seat outside the upper sliding sleeve. A flow-limiting sleeve is arranged inside the collar; an upper central hole is arranged at the center of the bottom of the upper bearing seat. Upper radial flow holes are evenly distributed on the circumference of the upper bearing seat. The upper radial flow holes are successively communicated with the turbine through the upper central hole, the annulus between the upper balance drum and the upper bearing seat, and the annulus between the upper sliding sleeve and the flow-limiting sleeve; the upper radial flow holes are also successively communicated with the annulus between the heat-insulated oil pipe and the casing through the communication hole on the upper shell and the liquid outlet hole on the upper sealing flange.

[0018] A power liquid injection channel is arranged on the upper bearing seat between the upper radial flow holes; a closing valve is arranged on the top end face of the upper bearing seat; the top end of the turbine is successively communicated with the coiled tubing through the power liquid injection channel, the closing valve and an upper joint; the bottom of the turbine is successively communicated with the annulus between the casing and the heat-insulated oil pipe through the power liquid outlet on the upper shell and the liquid outlet hole on the middle sealing flange.

[0019] A flow deflector is arranged on the main shaft above the centrifugal pump assembly.

[0020] The described flow guide is composed of a mechanical seal, an outer flow guide cylinder, an inner flow guide cylinder, a lower bearing seat, and a centrifugal ring. An outer flow guide cylinder is sleeved on the mechanical seal, and the outer flow guide cylinder is slidably and sealingly connected to the mechanical seal; a lower bearing seat is arranged on the end face of the outer flow guide cylinder; an inner flow guide cylinder is inserted into the outer flow guide cylinder above the mechanical seal. A limiting flange is arranged on the circumference of the inner flow guide cylinder, and the limiting flange is movably connected to the lower bearing seat through a thrust bearing; a centrifugal ring is arranged on the top of the lower bearing seat; the outer flow guide cylinder, the lower bearing seat, and the centrifugal ring are respectively fixedly and sealingly connected to the upper housing; the inner flow guide cylinder and the mechanical seal are fixedly connected to the main shaft; the bottom end of the outer flow guide cylinder abuts against the pump casing; the top end of the inner flow guide cylinder abuts against the turbine through a lower limiting sleeve.

[0021] The cross-section of the described inner flow guide cylinder is in an umbrella shape, and the inner flow guide cylinder and the top end face of the centrifugal ring are arranged at intervals.

[0022] The cross-section of the described outer flow guide cylinder is in an "I" shape, and upper radial holes are arranged on the bottom circumference of the outer flow guide cylinder. The upper radial holes are communicated with the bottom of the turbine through the annulus between the outer flow guide cylinder and the inner flow guide cylinder, the axial liquid flow holes arranged on the lower bearing seat, and the annulus between the centrifugal ring and the inner flow guide cylinder in sequence.

[0023] Upper oil flow channels are arranged on the bottom end faces of the outer flow guide cylinder on both sides of the upper radial holes; an oil outlet hole is arranged on the upper housing outside the middle of the outer flow guide cylinder. The outside of the oil outlet hole is communicated with the annulus between the coiled tubing and the heat-insulated tubing through the annulus between the short connecting cylinder and the upper housing and the injection-production channel, and the inside of the oil outlet hole is communicated with the pump casing through the annulus between the outer flow guide cylinder and the upper housing and the upper oil flow channels.

[0024] A power fluid axial flow channel is arranged on the lower housing outside the pump casing.

[0025] A support seat, a limiting sliding sleeve, and a lower flow guide cylinder are sequentially arranged on the inner wall of the lower housing below the pump casing from top to bottom. A lower joint is installed on the bottom end of the lower housing by threading, and the pump casing, the support seat, the limiting sliding sleeve, the lower flow guide cylinder, and the lower joint are abutted and connected to each other.

[0026] The cross-section of the described lower flow guide cylinder is in an "H" shape, and lower radial holes are arranged on the circumference of the lower flow guide cylinder. The lower radial holes are communicated with the upper radial holes through the power fluid axial flow channel; lower oil flow channels are respectively arranged on the lower flow guide cylinder on both sides of the lower radial holes, and the lower oil flow channels are respectively communicated with the pump casing and the lower joint; a lower balance drum is movably installed at the center of the upper end of the lower flow guide cylinder through a sliding sleeve, and the lower balance drum is sleeved and connected to the bottom end of the main shaft; a flow dividing block is installed on the lower flow guide cylinder below the lower balance drum by threading.

[0027] The beneficial effects of the present invention are as follows:

[0028] The integrated injection-production hydraulic-driven heavy oil production system separates the channels for flowing steam and heavy oil from the channels for flowing power fluid, preventing the power fluid from easily entering the channels for flowing steam and heavy oil, thereby ensuring that the heavy oil is not polluted; with the cooperation of a deflector and a balance drum, it can counteract the downward force generated by the centrifugal pump assembly on the main shaft, ensuring the normal rotation of the main shaft and thus the normal operation of the centrifugal pump assembly; the metal sealing structure can maintain the seal, and compared with the rubber sealing ring, the metal sealing structure can maintain the seal while withstanding higher temperatures and pressures; it solves the problem that the power fluid of the existing hydraulic submersible pump easily causes oil layer pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the state when the present invention injects steam ( Figure 1 the hollow arrow in it indicates the steam flow direction);

[0030] Figure 2 is a schematic diagram of the state when the present invention produces oil ( Figure 2 the hollow arrow in it indicates the power fluid flow direction; the solid arrow indicates the heavy oil flow direction);

[0031] Figure 3 is a schematic cross-sectional view of the hydraulic submersible pump of the present invention ( Figure 3 the hollow arrow in it indicates the steam flow direction);

[0032] Figure 4 is an enlarged schematic view of the upper end of the hydraulic submersible pump of the present invention ( Figure 4 the solid arrow in it indicates the power fluid flow direction);

[0033] Figure 5 is an enlarged schematic view of the middle part of the hydraulic submersible pump of the present invention ( Figure 5 the solid arrow in it indicates the power fluid flow direction; the hollow arrow indicates the heavy oil flow direction);

[0034] Figure 6 is an enlarged schematic view of the lower end of the hydraulic submersible pump of the present invention ( Figure 6 the solid arrow in it indicates the power fluid flow direction; the hollow arrow indicates the heavy oil flow direction);

[0035] Figure 7 is a schematic structural view of the short joint cylinder of the present invention;

[0036] Figure 8 is Figure 7 an enlarged schematic view of the position A in it;

[0037] Figure 9 is an assembly schematic view of the metal sealing structure of the present invention;

[0038] Figure 10 is an assembly schematic view of the improved type of the metal sealing structure of the present invention;

[0039] Figure 11 is Figure 10 An enlarged schematic view at position B in

[0040] Figure 12 is Figure 4 A schematic structural view in the C-C direction in

[0041] Figure 13 is Figure 3 A schematic structural view in the D-D direction in

[0042] Figure 14 is Figure 5 A schematic structural view in the E-E direction in

[0043] Figure 15 is Figure 5 A schematic structural view in the F-F direction in

[0044] Figure 16 is Figure 6 A schematic structural view in the G-G direction in

[0045] In the figure: 1. coiled tubing, 2. insulated tubing, 3. casing, 4. power fluid injection pump, 5. storage oil tank, 6. steam injection pump, 7. upper housing, 8. main shaft, 9. turbine, 10. upper joint, 11. lower housing, 12. pump housing, 13. impeller, 14. nipple, 15. upper sealing flange, 16. middle sealing flange, 17. lower sealing flange, 18. liquid outlet hole, 19. injection-production channel, 20. packer, 21. positioning block, 22. spiral groove, 23. positioning flange, 24. metal sealing ring, 25. annular spring, 26. disc spring, 27. metal bellows, 28. elastic lining, 29. metal coating, 30. upper bearing seat, 31. upper balance drum, 32. thrust bearing, 33. upper sliding sleeve, 34. upper limiting sleeve, 35. collar, 36. flow-limiting sleeve, 37. upper central hole, 38. upper radial flow hole, 39. power fluid injection channel, 40. shut-off valve, 41. power fluid outlet, 42. mechanical seal, 43. outer guide cylinder, 44. inner guide cylinder, 45. lower bearing seat, 46. centrifugal ring, 47. limiting flange, 48. lower limiting sleeve, 49. upper radial hole, 50. axial liquid flow hole, 51. upper oil outlet flow channel, 52. oil outlet hole, 53. power fluid axial flow channel, 54. support seat, 55. limiting sliding sleeve, 56. lower guide cylinder, 57. lower joint, 58. lower radial hole, 59. lower oil outlet flow channel, 60. sliding sleeve, 61. lower balance drum, 62. flow splitting block, 63. oil reservoir. Specific embodiments

[0046] The integrated injection-production hydraulic-driven heavy oil production system consists of a surface mechanism, coiled tubing 1, insulated tubing 2, casing 3, and a submersible hydraulic pump. The surface mechanism includes a power fluid injection pump 4, an oil storage tank 5, and a steam injection pump 6. The coiled tubing 1 is sleeved with the insulated tubing 2, and the insulated tubing 2 is sleeved with the casing 3, so as to transport steam to the bottom of the well (or transport heavy oil upward) through the annulus between the insulated tubing 2 and the coiled tubing 1, transport the power fluid downward through the coiled tubing 1, and transport the returned power fluid upward through the annulus between the insulated tubing 2 and the casing 3. Thus, the transport flow channels of the power fluid and steam (or heavy oil) are separated, making it difficult for the power fluid to enter the oil layer through the steam transport channel or directly enter the heavy oil during the transport of heavy oil, and further making it difficult for the power fluid to contaminate the heavy oil. The bottom end of the coiled tubing 1 is connected to a submersible hydraulic pump. The submersible hydraulic pump consists of a turbine assembly and a centrifugal pump assembly. The centrifugal pump assembly is arranged below the turbine assembly, so that when the power fluid passes through the turbine assembly, the turbine assembly is rotated by the high-pressure power fluid, and then the turbine assembly can drive the centrifugal pump assembly to rotate. Thus, the heavy oil in the oil layer is pumped out by the centrifugal pump assembly and transported to the surface. The top end of the turbine assembly is connected to the outlet of the power fluid injection pump 4 through the coiled tubing 1 and a connecting pipe; the bottom end of the turbine assembly is connected to the inlet of the power fluid injection pump 4 through the annulus between the insulated tubing 2 and the casing 3 and a connecting pipe, so that the power fluid injection pump 4 drives the power fluid to enter the turbine assembly from the connecting pipe and the coiled tubing 1, drives the turbine assembly to rotate, and after the turbine assembly rotates, the power fluid returns to the power fluid injection pump 4 through the annulus between the turbine assembly, the insulated tubing 2 and the casing 3 and the connecting pipe. Thus, the power fluid circulates, and during the circulation of the power fluid, the turbine assembly is driven to rotate, and then the centrifugal pump assembly is driven to rotate. The bottom end of the centrifugal pump assembly extends below the insulated tubing 2, and the top end of the centrifugal pump assembly is connected to the steam injection pump 6 or the oil storage tank 5 through the annulus between the insulated tubing 2 and the coiled tubing 1 and a connecting pipe. The top end of the centrifugal pump assembly is respectively connected to the steam injection pump 6 and the oil storage tank 5, and the steam injection pump 6 and the oil storage tank 5 can be switched through valves to connect the steam injection pump 6 to the centrifugal pump assembly or switch to connect the oil storage tank 5 to the centrifugal pump assembly. When injecting steam into the underground oil layer, the top end of the centrifugal pump assembly is connected to the steam injection pump 6 through the annulus between the insulated tubing 2 and the coiled tubing 1 and a connecting pipe, so as to pressurize the steam through the steam injection pump 6, increase the steam pressure, and ensure that the increased steam pressure can be introduced into the bottom of the well; when pumping the heavy oil in the underground oil layer, the top end of the centrifugal pump assembly is connected to the oil storage tank 5 through the annulus between the insulated tubing 2 and the coiled tubing 1 and a connecting pipe, so that the heavy oil pumped by the centrifugal pump assembly can be injected into the oil storage tank 5 through the annulus between the insulated tubing 2 and the coiled tubing 1 and a connecting pipe to store the produced heavy oil.

[0047] The turbine assembly is composed of an upper housing 7, a main shaft 8 and a turbine 9. The main shaft 8 is arranged inside the upper housing 7, and the turbine 9 is arranged on the main shaft 8 inside the upper housing 7. The upper housing 7 is connected to the coiled tubing 1 through an upper joint 10. When the power fluid impacts the turbine 9 and drives the turbine 9 to rotate, the main shaft 8 can be driven to rotate by the turbine 9. The centrifugal pump assembly is composed of a lower housing 11, a pump housing 12 and an impeller 13. The pump housing 12 is arranged inside the lower housing 11, the impeller 13 is arranged inside the pump housing 12, and the impeller 13 is connected to the main shaft 8 extending into the pump housing 12. The lower housing 11 is threadedly connected to the upper housing 7. When the main shaft 8 rotates, the impeller 13 can be driven to rotate, so that the impeller 13 cooperates with the pump housing 12 during rotation to generate negative pressure. Thus, the viscous oil in the underground oil layer is extracted through the underground pressure and the negative pressure generated by the cooperation between the impeller 13 and the pump housing 12, and the viscous oil is transported from the underground to the ground.

[0048] A nipple 14 is provided at the bottom end of the insulated tubing 2. An upper sealing flange 15, a middle sealing flange 16 and a lower sealing flange 17 are sequentially arranged on the inner wall of the nipple 14 from top to bottom. Liquid outlet holes 18 are respectively arranged on the upper sealing flange 15 and the middle sealing flange 16. Injection and production channels 19 are arranged on the upper sealing flange 15 between the liquid outlet holes 18 and on the end faces of the middle sealing flange 16. The upper sealing flange 15 and the middle sealing flange 16 are respectively sealed and connected to the upper housing 7 through a metal sealing mechanism. The lower sealing flange 17 is sealed and connected to the lower housing 11 through a metal sealing mechanism. The bottom end of the nipple 14 is sealed and connected to the casing 3 through a packer 20 (Y211-144 type packer), so as to separate the annulus between the insulated tubing 2 and the casing 3 from the reservoir 63 at the lower end of the nipple 14 through the packer 20, so that the power fluid in the annulus between the insulated tubing 2 and the casing 3 cannot enter the reservoir below the nipple 14, and thus the power fluid is not likely to contaminate the viscous oil.

[0049] A positioning block 21 is provided on the top end face of the upper sealing flange 15, and a spiral groove 22 is provided on the short connection cylinder 14 above the positioning block 21; a positioning flange 23 is provided on the upper housing 7, and the positioning flange 23 is in abutting connection with the upper sealing flange 15 and is engaged with the positioning block 21 and the spiral groove 22. During the rotation of the main shaft 8 driven by the turbine 9, the turbine 9 generates a force on the upper housing 7 in the direction opposite to the rotation direction of the main shaft 8, causing the upper housing 7 to have a rotational tendency in the direction opposite to the rotation direction of the main shaft 8. Furthermore, the positioning flange 23 on the upper housing 7 has a rotational tendency in the direction opposite to the rotation direction of the main shaft 8, so that the positioning flange 23 has a downward movement tendency under the action of the spiral groove 22, pressing the positioning flange 23 onto the upper sealing flange 15, maintaining the axial position of the positioning flange 23 within the short connection cylinder 14, and further maintaining the position of the submersible hydraulic pump, making the submersible hydraulic pump not easily move up and down. The function of the positioning block 21 is to cooperate with the spiral groove 22 to limit the axial position of the positioning flange 23, preventing the positioning flange 23 from rotating, and further preventing the upper housing from rotating, so as to overcome the directional force of the turbine 9 on the upper housing 7 when the turbine 9 rotates.

[0050] The metal sealing structure is arranged in the assembly grooves of the upper sealing flange 15 and the middle sealing flange 16 on both sides of the lower sealing flange 17 and the liquid outlet hole 18. The metal sealing mechanism is composed of a metal sealing ring 24, an annular spring 25 and a disc spring 26. The outer wall of the metal sealing ring 24 is hoop-shaped with an annular spring 25, and a disc spring 26 is arranged at the bottom of the metal sealing ring 24; the top end face of the metal sealing ring 24 is in sealed connection with the top inner wall of the assembly groove, and the inner wall of the metal sealing ring 24 is in sliding sealed connection with the upper housing 7; the top of the disc spring 26 is in abutting connection with the metal sealing ring 24, and the bottom of the disc spring 26 is in abutting connection with the top inner wall of the assembly groove. The function of the annular spring 25 is to generate an inward contraction pre-tightening force on the metal sealing ring 24 through the elastic force of the annular spring 25, thereby maintaining the seal between the inner wall of the metal sealing ring 24 and the upper housing 7. The function of the disc spring 26 is to generate an upward thrust on the metal sealing ring 24 through the elastic force of the disc spring 26, maintaining the seal between the metal sealing ring 24 and the assembly groove, and further maintaining the seal between the metal sealing ring 24 and the upper sealing flange 15, the middle sealing flange 16 and the lower sealing flange 17, and further maintaining the seal between the upper sealing flange 15, the middle sealing flange 16 and the lower sealing flange 17 and the upper housing 7. Since the metal sealing ring 24 is made of metal, compared with the rubber sealing ring, the metal sealing ring 24 can effectively increase the wear resistance and pressure bearing capacity, and thus effectively enhance the service life; at the same time, through the elastic forces of the annular spring 25 and the disc spring 26, the metal sealing ring 24 can contract after wear, maintaining the seal of the upper housing 7, and further extending the service life of the metal sealing ring 24; and because the metal sealing ring 24 can contract under the elastic forces of the annular spring 25 and the disc spring 26, it can overcome the seal loosening caused by the vibration of the downhole components, improving the sealing performance of the metal sealing ring 24.

[0051] The metal sealing structure can also be arranged in the assembly grooves of the upper shell 7 on both sides of the liquid outlet hole 18 and corresponding to the lower sealing flange 17, and the metal sealing ring 24 of the metal sealing structure is hermetically connected to the upper sealing flange 15, the middle sealing flange 16 and the lower sealing flange 17.

[0052] As an improvement, the metal sealing structure is composed of a metal bellows 27, an elastic lining 28 and a metal coating 29. The elastic lining 28 is arranged on the end surface of the metal bellows 27, and the metal coating 29 is arranged on the elastic lining 28; the metal bellows 27 is inserted into the assembly grooves on the upper sealing flange 15 and the lower sealing flange 16 outside the liquid outlet hole 18. The elastic lining 28 keeps the metal coating 29 sealed with the upper shell 7 through the elastic force of the metal bellows 27, and at the same time squeezes the metal bellows 27 to make the metal bellows 27 expand outwards and contract inwards, so that the metal bellows 27 is sealed with the assembly groove, and further makes the metal bellows sealed with the upper sealing flange 15 and the middle sealing flange 16, thereby keeping the seal between the upper shell 7 and the upper sealing flange 15 and the middle sealing flange 16 around the liquid outlet hole 18. Since the metal bellows 27 and the metal coating 29 are both made of metal, compared with the rubber sealing ring, the pressure-bearing capacity and service life can be effectively increased.

[0053] An upper bearing seat 30 is fixedly installed inside an upper housing 7 at the top end of a main shaft 8. The top end of the main shaft 8 is threadedly installed with an upper balance drum 31. The top of the upper balance drum 31 is connected to the upper bearing seat 30 through a thrust bearing 32. A upper sliding sleeve 33 is sleeved on the main shaft 8 at the bottom of the upper balance drum 31. The upper sliding sleeve 33 is connected to a turbine 9 through an upper limit sleeve 34. A collar 35 is threadedly installed on the upper bearing seat 30 outside the upper sliding sleeve 33. A flow-limiting sleeve 36 is arranged inside the collar 35. An upper central hole 37 is arranged at the center of the bottom of the upper bearing seat 30. Upper radial flow holes 38 are evenly distributed on the circumference of the upper bearing seat 30. The upper radial flow holes 38 are sequentially communicated with the turbine 9 through the annulus between the upper central hole 37, the upper balance drum 31 and the upper bearing seat 30, and the annulus between the upper sliding sleeve 33 and the flow-limiting sleeve 36. The upper radial flow holes 38 are also sequentially communicated with the annulus between a heat-insulating oil pipe 2 and a casing 3 through a communication hole on the upper housing 7 and a liquid outlet hole 18 on an upper sealing flange 15. The function of the upper radial flow holes 38 is to enable a part of the power fluid entering the turbine 9 to sequentially pass through the annulus between the upper sliding sleeve 33 and the flow-limiting sleeve 36, the annulus between the upper balance drum 31 and the upper bearing seat 30, the upper central hole 37, the upper radial flow holes 38, the communication hole on the upper housing 7, and the liquid outlet hole 18 on the upper sealing flange 15 and enter the annulus between the heat-insulating oil pipe 2 and the casing 3, so as to enable a part of the power fluid to flow back to the inlet of a power fluid injection pump 4. Since the annular gap between the flow-limiting sleeve 36 and the outside of the sliding sleeve 33 is very small, the upwardly shunted fluid pressure will generate an upward thrust on the upper sliding sleeve 33 and the balance drum 31 to balance the downward thrust on the main shaft, and at the same time absorb the heat on the main shaft 8 and the bearings through the power fluid to cool down the main shaft 8. The function of the flow-limiting sleeve 36 is to adjust the size of the annulus outside the upper sliding sleeve 33, thereby adjusting the return flow rate of the power fluid to the power fluid injection pump 4, and adjusting the pressure of the power fluid entering the turbine 9, thereby adjusting the rotational speed of the turbine 9.

[0054] A power fluid injection channel 39 is provided on the upper bearing housing 30 between the upper radial flow holes 38; a closing valve 40 is provided on the top end face of the upper bearing housing 30; the top end of the turbine 9 is sequentially connected to the coiled tubing 1 through the power fluid injection channel 39, the closing valve 40 and the upper joint 10; so that the power fluid can be injected into the turbine 9 successively through the coiled tubing 1, the upper joint 109, the closing valve 40 and the power fluid injection channel 39, and then can impact the turbine 9 to make the turbine 9 rotate. The bottom of the turbine 9 is sequentially communicated with the annulus between the casing 3 and the thermal insulation tubing 2 through the power fluid outlet 41 provided on the upper housing 7 and the liquid outlet hole 18 on the middle sealing flange 16; so that the power fluid returns through the power fluid outlet 41 on the upper housing 7 and the liquid outlet hole 18 on the middle sealing flange 16 to the annulus between the casing 3 and the thermal insulation tubing 2 after impacting the turbine 9. The closing valve 40 is composed of a valve seat, a spring, a sliding sleeve, a valve head and a retaining ring. The valve head is movably inserted on the valve seat through the sliding sleeve, a spring is arranged between the valve head and the valve seat, a retaining ring is arranged on the upper joint above the valve head, and the retaining ring is hermetically connected to the valve head.

[0055] A flow guide is provided on the main shaft 8 above the centrifugal pump assembly. The flow guide is composed of a mechanical seal 42, an outer flow guide cylinder 43, an inner flow guide cylinder 44, a lower bearing housing 45 and a centrifugal ring 46. The outer flow guide cylinder 43 is sleeved on the mechanical seal 42, and the outer flow guide cylinder 43 is slidably and hermetically connected to the mechanical seal 42; a lower bearing housing 45 is provided on the end face of the outer flow guide cylinder 43; the inner flow guide cylinder 44 is inserted into the outer flow guide cylinder 43 above the mechanical seal 42. A limit flange 47 is provided on the circumference of the inner flow guide cylinder 44, and the limit flange 47 is movably connected to the lower bearing housing 45 through a thrust bearing 32; the inner flow guide cylinder 44 and the mechanical seal 42 are fixedly connected to the main shaft 8; the bottom end of the outer flow guide cylinder 43 abuts against and is connected to the pump casing 12; the top end of the inner flow guide cylinder 44 abuts against and is connected to the turbine 9 through a lower limit sleeve 48; when the impeller 2 rotates, the impeller 13 pushes the viscous oil to move upward, and the gravity of the viscous oil will push the impeller 13 to generate a downward thrust, causing the impeller 13 to have a tendency to move downward, and then generating a tendency for the main shaft 8 to move downward; the function of the limit flange 47 is to limit the position of the inner flow guide cylinder 44 through the limit flange 47, and then limit the main shaft 8 to prevent the main shaft 8 from sinking and maintain the relative position between the impeller 13 and the pump casing 12 to ensure that the impeller 13 can work normally. A centrifugal ring 46 is provided on the top of the lower bearing housing 45; the outer flow guide cylinder 43, the lower bearing housing 45 and the centrifugal ring 46 are respectively fixedly and hermetically connected to the upper housing 7. The cross section of the outer flow guide cylinder 43 is in the shape of a "work" character, and upper radial holes 49 are provided on the bottom circumference of the outer flow guide cylinder 43. The upper radial holes 49 are sequentially communicated with the bottom of the turbine 9 through the annulus between the outer flow guide cylinder 43 and the inner flow guide cylinder 44, the axial liquid flow holes 50 provided on the lower bearing housing 45, and the annulus between the centrifugal ring 46 and the inner flow guide cylinder 44.

[0056] The cross-section of the inner flow guide cylinder 44 is umbrella-shaped. Its purpose is to guide the power fluid through the inclined surface at the top end of the inner flow guide cylinder 44, making the power fluid flow towards the power fluid outlet 41, and reducing the impact force of the power fluid on the inner flow guide cylinder 44 and the centrifugal ring 46. The top end faces of the inner flow guide cylinder 44 and the centrifugal ring 46 are arranged at intervals, so that the power fluid can flow downward through the annulus between the inner flow guide cylinder 44 and the centrifugal ring 46. When the main shaft 8 rotates, the umbrella-shaped annulus flow channel between the centrifugal ring 46 and the inner flow guide cylinder 44 will generate centrifugal force on the power fluid in the flow channel, separating impurities in the power fluid and keeping the power fluid entering the lower bearing 32 clean, thus extending the bearing life.

[0057] On the inner wall of the lower housing 11 below the pump housing 12, a support seat 54, a limit sliding sleeve 55 and a lower flow guide cylinder 56 are successively arranged from top to bottom. The bottom end of the lower housing 11 is threadedly installed with a lower joint 57. The pump housing 12, the support seat 54, the limit sliding sleeve 55, the lower flow guide cylinder 56 and the lower joint 57 are abutted and connected to each other. A power fluid axial flow channel 53 is arranged on the lower housing 11 outside the pump housing 12. The cross-section of the lower flow guide cylinder 56 is in an "H" shape. Lower radial holes 58 are arranged on the circumference of the lower flow guide cylinder 56. The lower radial holes 58 are communicated with the upper radial holes 49 through the power fluid axial flow channel 53. Lower oil outlet flow channels 59 are respectively arranged on the lower flow guide cylinder 56 on both sides of the lower radial holes 58. The lower oil outlet flow channels 59 are respectively communicated with the pump housing 12 and the lower joint 57. The center of the upper end of the lower flow guide cylinder 56 is movably installed with a lower balance drum 61 through a sliding sleeve 60. The lower balance drum 61 is sleeved and connected to the bottom end of the main shaft 8.

[0058] The function of the flow guide device is to respectively guide the power fluid and the heavy oil, so that the power fluid can enter the power fluid axial flow channel 53 through the flow guide device (successively through the annulus between the centrifugal ring 46 and the inner flow guide cylinder 44, the axial liquid flow holes 50 arranged on the lower bearing seat 45, the annulus between the outer flow guide cylinder 43 and the inner flow guide cylinder 44, and the upper radial holes 49), and then enter between the lower balance drum 61 and the lower flow guide cylinder 56 through the lower radial holes 58. Thus, an upward thrust is formed on the lower balance drum 61 by the power fluid, and then a thrust is formed on the main shaft 8 to balance the downward acting force on the main shaft and prevent the main shaft 8 from moving downward. The function of the sliding sleeve 60 is to seal between the lower balance drum 61 and the lower flow guide cylinder 56 through the sliding sleeve 60, preventing the power fluid from entering between the impeller 13 and the pump housing 12 from between the lower balance drum 61 and the lower flow guide cylinder 56, and thus avoiding polluting the heavy oil between the impeller 13 and the pump housing 12.

[0059] On the bottom end face of the outer guide cylinder 43 on both sides of the upper radial hole 49, an upper oil outlet flow channel 51 is provided; on the upper shell 7 outside the middle of the outer guide cylinder 43, an oil outlet hole 52 is provided. The outside of the oil outlet hole 52 is communicated with the annulus between the coiled tubing 1 and the heat-insulating tubing 2 through the annulus between the stub tube 14 and the upper shell 7 and the injection-production channel 19. The inside of the oil outlet hole 52 is communicated with the pump housing 12 through the annulus between the outer guide cylinder 43 and the upper shell 7 and the upper oil outlet flow channel 51, so that the viscous oil can sequentially pass through the upper oil outlet flow channel 51 on the outer guide cylinder 43, the annulus between the outer guide cylinder 43 and the upper shell 7, and the oil outlet hole 52 to enter the annulus between the upper shell 7 and the stub tube 14, and then sequentially pass through the annulus between the stub tube 14 and the upper shell 7 and the injection-production channel 19 to enter the annulus between the coiled tubing 1 and the heat-insulating tubing 2, and thus enter the storage oil tank 5. A flow dividing block 62 is threadedly installed on the lower guide cylinder 56 below the lower balance drum 61 to divide the viscous oil through the flow dividing block 62.

[0060] When the injection-production integrated hydraulic-driven viscous oil production system injects steam into the oil layer, the annulus between the coiled tubing 1 and the heat-insulating tubing 2 is switched to be communicated with the steam injection pump 6. After the switching is completed, pressurized steam is injected into the annulus between the coiled tubing 1 and the heat-insulating tubing 2 through the steam injection pump 6. The steam entering the annulus between the coiled tubing 1 and the heat-insulating tubing 2 sequentially passes through the annulus between the stub tube 14 and the upper shell 7, the upper sealing flange 15, the injection-production channel 19 on the middle sealing flange 16, the oil outlet hole 52 on the upper shell 7, the annulus between the upper shell 7 and the outer guide cylinder 43, the upper oil outlet flow channel 51 on the outer guide cylinder 43, between the pump housing 12 and the impeller 13, and the lower oil outlet flow channel 59 on the lower guide cylinder 56 to enter the lower joint 57, and then enter the oil layer, and the viscous oil is heated by the heat of the steam, reducing the viscosity of the viscous oil and increasing the fluidity of the viscous oil.

[0061] After injecting steam into the oil reservoir to increase the fluidity of the viscous oil, the integrated injection-production hydraulic-driven viscous oil production system extracts the viscous oil. After the steam injection into the oil reservoir is completed, the annulus between the coiled tubing 1 and the insulated tubing 2 is switched to communicate with the storage tank 5. After the switching is completed, the power fluid injection pump 4 is started, and the power fluid is circulated under the drive of the power fluid injection pump 4. When the power fluid circulates, the power fluid enters the coiled tubing 1 from the outlet of the power fluid injection pump 4. The power fluid entering the coiled tubing 1 sequentially passes through the upper joint 10, the shut-off valve 40, and the power fluid injection channel 39 on the upper bearing housing 30 and enters above the turbine 9. Part of the power fluid entering above the turbine 9 sequentially passes through the annulus between the upper sliding sleeve 33 and the flow-limiting sleeve 36, the annulus between the upper balance drum 31 and the upper bearing housing 30, the upper central hole 37, the upper radial flow hole 38, the communication hole on the upper housing 7, and the liquid outlet hole 18 on the upper sealing flange 15 and enters the annulus between the nipple 14 and the casing 3. Another part of the power fluid entering above the turbine 9 impacts the turbine 9, causing the turbine 9 to drive the main shaft 8 to rotate. The power fluid after impacting the turbine 9 sequentially passes through the lower limit sleeve 48, the power fluid outlet 41 on the upper housing 7, and the liquid outlet hole 18 on the middle sealing flange 16 and enters the annulus between the nipple 14 and the casing 3. The power fluid flowing out from the power fluid outlet 41 and the power fluid flowing out from the upper radial flow hole 38 merge in the annulus between the nipple 14 and the casing 3. The merged power fluid returns to the power fluid injection pump 4 through the annulus between the insulated tubing 2 and the casing 3. When the main shaft 8 rotates, it drives the impeller 13 of the centrifugal pump assembly to rotate. During the rotation of the impeller 13, the impeller 13 and the pump casing 12 cooperate to generate a negative pressure on the oil reservoir, causing the viscous oil in the oil reservoir to sequentially pass through the annulus between the lower joint 57 and the diverter block 62, and the lower oil flow channel 59 on the lower guide cylinder 56 and enter between the impeller 13 and the pump casing 12. The viscous oil entering between the impeller 13 and the pump casing 12 is pumped upward during the rotation of the impeller 13, causing the viscous oil to sequentially pass through the upper oil flow channel 51 on the outer guide cylinder 43, the annulus between the outer guide cylinder 43 and the upper housing 7, the oil outlet hole 52 on the upper housing 7, the upper sealing flange 15, and the injection-production channel 19 on the middle sealing flange 16, the annulus between the nipple 14 and the upper housing 7, and the annulus between the insulated tubing 2 and the coiled tubing and enter the storage tank 5.

[0062] The above processes of injecting steam and extracting viscous oil are alternately carried out in sequence to extract the viscous oil.

[0063] The injection-production integrated hydraulic-driven heavy oil production system separates the channels for flowing steam and heavy oil from the channels for flowing power fluid, preventing the power fluid from easily entering the channels for flowing steam and heavy oil, thereby ensuring that the heavy oil is not contaminated; with the cooperation of the deflector, the balance drum 61 can counteract the downward force generated by the centrifugal pump assembly on the main shaft 8, ensuring the normal rotation of the main shaft and thus ensuring the normal operation of the centrifugal pump assembly; the metal sealing structure can maintain the seal, and compared with the rubber sealing ring, the metal sealing structure can maintain the seal while withstanding higher temperatures and pressures; it solves the problem that the power fluid of the existing hydraulic submersible pump easily causes oil reservoir pollution.

Claims

1. An integrated injection-production hydraulic-driven heavy oil exploitation system, which consists of a ground mechanism, a coiled tubing (1), a heat-insulating oil pipe (2), a casing (3) and a hydraulic submersible pump. The ground mechanism includes a power fluid injection pump (4), an oil storage tank (5) and a steam injection pump (6); the coiled tubing (1) is sleeved with the heat-insulating oil pipe (2), and the heat-insulating oil pipe (2) is sleeved with the casing (3); the bottom end of the coiled tubing (1) is connected with the hydraulic submersible pump; the hydraulic submersible pump consists of a turbine assembly and a centrifugal pump assembly, and the centrifugal pump assembly is arranged below the turbine assembly, and its characteristics are as follows: At the bottom end of the heat-insulating oil pipe (2), there is a nipple (14). On the inner wall of the nipple (14), there are successively arranged an upper sealing flange (15), a middle sealing flange (16), and a lower sealing flange (17) from top to bottom. Liquid outlet holes (18) are respectively arranged on the upper sealing flange (15) and the middle sealing flange (16). A injection and production channel (19) is arranged on the upper sealing flange (15) between the liquid outlet holes (18) and on the end face of the middle sealing flange (16); The top end of the turbine assembly is communicated with the outlet of the power fluid injection pump (4) through a coiled tubing (1) and a connecting pipe; The bottom end of the turbine assembly is communicated with the inlet of the power fluid injection pump (4) through the liquid outlet hole (18) of the nipple (14), the annulus between the heat-insulating oil pipe (2) and the casing (3), and the connecting pipe; The bottom end of the centrifugal pump assembly extends below the heat-insulating oil pipe (2), and the top end of the centrifugal pump assembly is communicated with the annulus between the heat-insulating oil pipe (2) and the coiled tubing (1), the connecting pipe, and the steam injection pump (6) or the oil storage tank (5) through the injection and production channel (19) of the nipple (14).

2. The integrated injection-production hydraulic-driven heavy oil exploitation system according to claim 1, and its characteristics are as follows: The described turbine assembly is composed of an upper housing (7), a main shaft (8), and a turbine (9). The main shaft (8) is arranged inside the upper housing (7), and the turbine (9) is arranged on the main shaft (8) inside the upper housing (7); The upper housing (7) is connected to the coiled tubing (1) through an upper joint (10); The described centrifugal pump assembly is composed of a lower housing (11), a pump housing (12), and an impeller (13). The pump housing (12) is arranged inside the lower housing (11), the impeller (13) is arranged inside the pump housing (12), and the impeller (13) is connected to the main shaft (8) extending into the pump housing (12); The lower housing (11) is threadedly connected to the upper housing (7); The upper sealing flange (15) and the middle sealing flange (16) are respectively sealed and connected to the upper housing (7) through a metal sealing mechanism; The lower sealing flange (17) is sealed and connected to the lower housing (11) through a metal sealing mechanism; The bottom end of the nipple (14) is sealed and connected to the casing (3) through a packer (20); A positioning block (21) is arranged on the top end face of the upper sealing flange (15), and a spiral groove (22) is arranged on the nipple (14) above the positioning block (21); A positioning flange (23) is arranged on the upper housing (7), and the positioning flange (23) abuts and connects with the upper sealing flange (15) and is clamped with the positioning block (21) and the spiral groove (22).

3. The integrated injection-production hydraulic-driven heavy oil exploitation system according to claim 2, and its characteristics are as follows: The described metal sealing mechanism is composed of a metal sealing ring (24), an annular spring (25), and a disc spring (26). The outer wall of the metal sealing ring (24) is hoop-shaped with an annular spring (25), and a disc spring (26) is arranged at the bottom of the metal sealing ring (24).

4. The integrated injection-production hydraulic-driven heavy oil exploitation system according to claim 2, and its characteristics are as follows: The described metal sealing mechanism is composed of a metal bellows (27), an elastic lining (28), and a metal coating (29). The elastic lining (28) is arranged on the end face of the metal bellows (27), and the metal coating (29) is arranged on the elastic lining (28).

5. The integrated injection-production hydraulic-driven heavy oil exploitation system according to claim 2, and its characteristics are as follows: An upper bearing seat (30) is fixedly installed inside an upper housing (7) at the top end of the main shaft (8). An upper balance drum (31) is threadedly installed at the top end of the main shaft (8). The top of the upper balance drum (31) is connected to the upper bearing seat (30) through a thrust bearing (32). An upper sliding sleeve (33) is sleeved on the main shaft (8) at the bottom of the upper balance drum (31). The upper sliding sleeve (33) is connected to the turbine (9) through an upper limit sleeve (34). A collar (35) is threadedly installed on the upper bearing seat (30) outside the upper sliding sleeve (33). A flow-limiting sleeve (36) is arranged inside the collar (35). An upper central hole (37) is provided at the center of the bottom of the upper bearing seat (30). Upper radial flow holes (38) are evenly distributed on the circumference of the upper bearing seat (30). The upper radial flow holes (38) are sequentially communicated with the turbine (9) through the annulus between the upper central hole (37), the upper balance drum (31) and the upper bearing seat (30), and the annulus between the upper sliding sleeve (33) and the flow-limiting sleeve (36). The upper radial flow holes (38) are also sequentially communicated with the annulus between the insulation oil pipe (2) and the casing (3) through the communication hole on the upper housing (7) and the liquid outlet hole (18) on the upper sealing flange (15). A power fluid injection channel (39) is provided on the upper bearing seat (30) between the upper radial flow holes (38). A shut-off valve (40) is arranged on the top end face of the upper bearing seat (30). The top end of the turbine (9) is sequentially communicated with the coiled tubing (1) through the power fluid injection channel (39), the shut-off valve (40) and the upper joint (10). The bottom of the turbine (9) is sequentially communicated with the annulus between the casing (3) and the insulation oil pipe (2) through the power fluid outlet (41) provided on the upper housing (7) and the liquid outlet hole (18) on the middle sealing flange (16).

6. The integrated injection-production hydraulic-driven heavy oil exploitation system according to claim 2, and its characteristics are as follows: A flow guide is provided on the main shaft (8) above the centrifugal pump assembly. The flow guide is composed of a mechanical seal (42), an outer flow guide cylinder (43), an inner flow guide cylinder (44), a lower bearing seat (45) and a centrifugal ring (46). The outer flow guide cylinder (43) is sleeved on the mechanical seal (42). The outer flow guide cylinder (43) is slidably and sealingly connected to the mechanical seal (42). A lower bearing seat (45) is arranged on the end face of the outer flow guide cylinder (43). The inner flow guide cylinder (44) is inserted into the outer flow guide cylinder (43) above the mechanical seal (42). A limit flange (47) is provided on the circumference of the inner flow guide cylinder (44). The limit flange (47) is movably connected to the lower bearing seat (45) through a thrust bearing (32). A centrifugal ring (46) is arranged on the top of the lower bearing seat (45). The outer flow guide cylinder (43), the lower bearing seat (45) and the centrifugal ring (46) are respectively fixedly and sealingly connected to the upper housing (7). The inner flow guide cylinder (44) and the mechanical seal (42) are fixedly connected to the main shaft (8). The bottom end of the outer flow guide cylinder (43) abuts against the pump housing (12). The top end of the inner flow guide cylinder (44) abuts against the turbine (9) through a lower limit sleeve (48).

7. The integrated injection-production hydraulic-driven heavy oil exploitation system according to claim 6, and its characteristics are as follows: The cross section of the outer guide tube (43) is in the shape of an I. An upper radial hole (49) is provided on the circumference of the bottom of the outer guide tube (43). The upper radial hole (49) is connected to the bottom of the turbine (9) through the annular space between the outer guide tube (43) and the inner guide tube (44), the axial liquid flow hole (50) provided on the lower bearing seat (45), and the annular space between the centrifugal ring (46) and the inner guide tube (44).

8. The integrated injection-production hydraulic-driven heavy oil exploitation system according to claim 7, and its characteristics are as follows: An upper oil outlet channel (51) is provided on the bottom end surface of the outer guide tube (43) on both sides of the upper radial hole (49); an oil outlet hole (52) is provided on the upper shell (7) on the outer side of the middle part of the outer guide tube (43); the outer side of the oil outlet hole (52) is connected to the annular space between the coiled tubing (1) and the insulating oil pipe (2) through the annular space between the short-circuit tube (14) and the upper shell (7) and the injection and production channel (19); the inner side of the oil outlet hole (52) is connected to the pump casing (12) through the annular space between the outer guide tube (43) and the upper shell (7) and the upper oil outlet channel (51).

9. The integrated injection-production hydraulic-driven heavy oil exploitation system according to claim 2, and its characteristics are as follows: The lower shell (11) outside the pump shell (12) is provided with a power fluid axial flow channel (53); A support seat (54), a limiting sleeve (55) and a lower guide tube (56) are arranged on the inner wall of the lower shell (11) below the pump shell (12) in order from top to bottom. A lower joint (57) is threadedly mounted on the bottom end of the lower shell (11). The pump shell (12), the support seat (54), the limiting sleeve (55), the lower guide tube (56) and the lower joint (57) are mutually abutted and connected.

10. The integrated injection-production hydraulic-driven heavy oil exploitation system according to claim 9, and its characteristics are as follows: The cross section of the lower guide tube (56) is in an "H" shape. A lower radial hole (58) is provided on the circumference of the lower guide tube (56). The lower radial hole (58) is connected to the upper radial hole (49) through the power fluid axial flow channel (53). Lower oil outlet channels (59) are provided on the lower guide tube (56) on both sides of the lower radial hole (58). The lower oil outlet channels (59) are connected to the pump housing (12) and the lower joint (57) respectively. A lower balance drum (61) is movably mounted at the center of the upper end of the lower guide tube (56) through a sliding sleeve (60). The lower balance drum (61) is sleeve-connected to the bottom end of the main shaft (8). A flow divider block (62) is threadedly mounted on the lower guide tube (56) below the lower balance drum (61).

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