An oil-water separation and simultaneous injection-production well completion structure

Abstract

The application discloses an oil-water separation and injection-production completion structure, and solves the technical problem of poor oil-water separation effect. The device comprises an oil tree, a tubing assembly, an injection-production pack-off assembly, a cable passing packer, a bridge assembly and an oil-water separation assembly, wherein the oil-water separation assembly comprises an oil-water separation pipe connected to the tubing assembly, an oil-water separator connected to the bottom of the oil-water separation pipe, a screw pump connected to the bottom of the oil-water separator, the screw pump being used for pressurizing the oil reservoir and conveying the oil reservoir to the oil-water separator, and a power source connected to the screw pump and providing power for the screw pump. The application can reduce the shearing and crushing effect on oil droplets, reduce the emulsification degree of the oil droplets, and improve the oil-water separation effect.

Description

Technical Field

[0001] This invention belongs to the field of oilfield development technology, specifically relating to a well completion structure for oil-water separation and simultaneous injection and production. Background Technology

[0002] Existing well completion systems for oil-water separation and injection-production in both offshore and onshore ultra-high-efficiency oilfields are mainly represented by Daqing Oilfield and Dagang Oilfield. These systems mostly employ rod screw pump production-screw pump injection, rod screw pump production-electric pump injection, pumping unit production-electric pump injection, and pumping unit production-pumping unit injection. Offshore systems, on the other hand, employ pressurized oil-water separation and injection-production in both offshore and offshore systems, represented by single motor single electric pump and dual electric pump.

[0003] However, existing offshore oil-water separation and injection-production completion processes are based on the separation of oil-water after pressurization by an oil-water separator. Due to the strong shearing and breaking effect of the oil droplets when the multi-stage centrifugal pump rotates at high speed, the oil droplets will be emulsified to a certain extent, thus affecting the oil-water separation effect, which needs to be improved. Summary of the Invention

[0004] In order to solve all or part of the above problems, the purpose of this invention is to provide an oil-water separation well injection-production-completion structure that can reduce the shearing and breaking effect on oil droplets, thereby reducing the degree of oil droplet emulsification and improving the oil-water separation effect.

[0005] This invention provides a well completion structure for oil-water separation and simultaneous injection and production, comprising:

[0006] A tree, used to secure the top of the casing;

[0007] The tubing assembly is connected to the bottom of the Christmas tree and is used to be lowered into the casing;

[0008] The injection-production isolation assembly is located at the bottom of the tubing assembly and is used to separate the casing into a production layer and a reinjection layer.

[0009] A cable packer is connected to the upper end of the tubing assembly, and an oil production annulus is formed between the cable packer and the injection-production packer assembly;

[0010] A bridge assembly connects the tubing assembly and the injection-production isolation assembly, and the bridge assembly is provided with a bridge channel connecting the production layer and the production annulus;

[0011] An oil-water separation assembly is connected to the oil pipe assembly and located within the oil production annulus;

[0012] The oil-water separation assembly includes:

[0013] An oil-water separator pipe is connected to the oil pipe assembly;

[0014] An oil-water separator is connected to the bottom of the oil-water separation pipe;

[0015] A screw pump is connected to the bottom of the oil-water separator. The screw pump is used to pressurize the oil reservoir and deliver it to the oil-water separator.

[0016] A power source is connected to the screw pump and provides power to the screw pump.

[0017] Optionally, the power source includes:

[0018] A submersible permanent magnet motor is connected to the bottom of the screw pump;

[0019] The power cable is connected at the bottom to the submersible permanent magnet motor and at the top passes through the cable sealer and connects to external power facilities.

[0020] A motor protector is connected to the submersible permanent magnet motor.

[0021] Optionally, the bottom of the submersible permanent magnet motor is connected to a downhole operating condition monitoring device to monitor the reservoir information in the oil production annulus in real time.

[0022] Optionally, a dual-channel check valve is connected to the oil-water separation pipe, and the dual-channel check valve is used to restrict the backflow of oil and water toward the oil-water separator.

[0023] Optionally, the tubing assembly includes:

[0024] Oil production tubing, connected to the bottom of the tree;

[0025] A multi-channel Y-type separator is connected to the bottom of the oil production pipe. The multi-channel Y-type separator is equipped with an oil channel and a water channel. The oil discharge pipe in the oil-water separation pipe is connected to the oil channel, and the drainage pipe is connected to the water channel.

[0026] The reinjection assembly is connected at the top to the water channel in the multi-channel Y-type suspension and at the bottom to the bridge assembly, and the separated water can be injected into the reinjection layer through the reinjection assembly.

[0027] Optionally, the reinjection assembly includes:

[0028] The return pipe is connected at the top to the water channel inside the multi-channel Y-type hanger and at the bottom to the injection bridge assembly.

[0029] A two-way valve is connected to the reinjection pipe and is used to provide an injection channel for unblocking fluid during unblocking and a backwashing channel during well backwashing.

[0030] An injection monitoring and control device is connected to the reinjection pipe and located below the bidirectional valve. The injection monitoring and control device is used to monitor information in the oil production annulus and continuously control the injection volume.

[0031] The signal cable is connected at the bottom to the injection monitoring and control device, and at the top passes through the cable seal and is connected to the external power facility.

[0032] Optionally, a downhole safety valve is connected to the oil production pipe, and the downhole safety valve is located above the cable packer.

[0033] Optionally, a flow sensor is connected to the oil production pipe to monitor the amount of oil produced.

[0034] Optionally, the injection-sequestration sealing assembly includes:

[0035] The injection and production pipe is connected to the bottom of the tubing assembly via the bridge assembly;

[0036] A top packer is installed on the injection-production tube;

[0037] Interlayer packer, connected to the injection-production tube and located below the top packer;

[0038] The production layer is formed between the top packer and the interlayer packer, and the reinjection layer is formed below the interlayer packer.

[0039] Optionally, the bridge assembly includes:

[0040] A bridge-type positioner is connected to the top of the injection-production pipe and to the reinjection pipe, and the top packer is connected to the bridge-type positioner;

[0041] A bridge-type injection device is connected to the injection-production tube and located between the top packer and the interlayer packer;

[0042] The bridge positioner and the bridge dispenser are respectively provided with interconnected bridge channels.

[0043] As can be seen from the above technical solution, the oil-water separation and simultaneous injection-production completion structure provided by the present invention has the following advantages:

[0044] This device utilizes a screw pump to pressurize and transport oil from the reservoir. Compared to centrifugal pumps, screw pumps reduce the shearing and fragmentation of oil droplets, thereby reducing oil droplet emulsification and improving oil-water separation. Simultaneously, the device integrates functions such as same-well injection and production, unblocking, backflow, and well washing, making it suitable for production applications in both offshore and onshore oilfields, including horizontal, directional, and vertical wells.

[0045] Other features and advantages of the present invention will be set forth in the following description. Attached Figure Description

[0046] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0047] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram illustrating the use of an embodiment of the present invention, showing the injection and production status of the same well;

[0049] Figure 3 This is a schematic diagram illustrating the use of an embodiment of the present invention, showing the unblocked state of the reinjection layer;

[0050] Figure 4 This is a schematic diagram illustrating the usage of an embodiment of the present invention, showing the unblocking state of the production layer;

[0051] Figure 5 This is a schematic diagram illustrating the use of an embodiment of the present invention, showing the state of the backwashing well.

[0052] Explanation of reference numerals in the attached figures:

[0053] 1. Wellhead; 2. Tubing Assembly; 21. Production Tubing; 22. Downhole Safety Valve; 23. Flow Sensor; 24. Multi-channel Y-type Hanger; 25. Reinjection Assembly; 251. Reinjection Pipe; 252. Two-way Valve; 253. Injection Monitoring and Control Device; 254. Signal Cable; 3. Injection-Production Packer Assembly; 31. Injection-Production Pipe; 32. Top Packer; 33. Interlayer Packer; 4. Bridge Assembly; 4 1. Bridge positioner; 42. Bridge injector; 5. Cable packer; 6. Production layer; 7. Reinjection layer; 8. Production annulus; 9. Oil-water separation assembly; 91. Oil-water separation pipe; 92. Oil-water separator; 93. Screw pump; 94. Power source; 941. Submersible permanent magnet motor; 942. Power cable; 943. Motor protector; 944. Downhole condition monitoring device; 10. Dual-channel check valve. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be arbitrarily combined with each other.

[0055] like Figures 1-5The figure shown is an embodiment of the present invention. This embodiment discloses an oil-water separation well injection and production completion structure, including a production tree 1 for fixing to the top of the casing, and a tubing assembly 2 fixedly connected to the bottom of the production tree 1, and the tubing assembly 2 is used to be lowered into the casing.

[0056] In one embodiment, such as Figure 1 As shown, the bottom of the tubing assembly 2 is provided with an injection-production packer assembly 3, and the injection-production packer assembly 3 is connected to the tubing assembly 2 through a bridge assembly 4. Meanwhile, the upper end of the tubing assembly 2 is provided with a cable packer 5, which is used to set on the inner wall of the casing.

[0057] In one embodiment, such as Figure 1 As shown, the injection-production packer assembly 3 is used to divide the casing into a production layer 6 and a reinjection layer 7. An oil production annulus 8 is formed between the cable packer 5 and the injection-production packer assembly 3. At the same time, a bridge channel (not shown in the figure) is provided on the bridge assembly 4, and the bridge channel connects the production layer 6 and the oil production annulus 8.

[0058] In one embodiment, such as Figure 1 As shown, an oil-water separation assembly 9 is connected to the tubing assembly 2, and the oil-water separation assembly 9 is located in the oil production annulus 8. The oil-water separation assembly 9 is used to separate oil and water in the oil reservoir in the oil production annulus 8 and transport the oil to the tubing assembly 2.

[0059] In one embodiment, such as Figure 1 As shown, the oil-water separation assembly 9 includes an oil-water separation pipe 91, an oil-water separator 92, a screw pump 93, and a power source 94. The top of the oil-water separation pipe 91 is connected to the oil pipe assembly 2, and the oil-water separator 92 is connected to the bottom of the oil-water separation pipe 91. The screw pump 93 is connected to the bottom of the oil-water separator 92, and the screw pump 93 is used to pressurize the oil reservoir and deliver it to the oil-water separator 92. The power source 94 is used to provide power to the screw pump 93.

[0060] In this embodiment, the oil-water separation is carried out using the same well injection-production completion structure. A screw pump 93 is used to pressurize and transport the oil reservoir. Compared with a centrifugal pump, the screw pump 93 can reduce the shearing and breaking effect on oil droplets, thereby reducing the degree of oil droplet emulsification and improving the oil-water separation effect.

[0061] In this embodiment, the oil-water separator 92 adopts a downhole parallel vortex oil-water separator, which achieves efficient separation of oil and water produced from the formation downhole based on coalescence collision and micro-vortex. It can be adapted to 7″ and 9-5 / 8″ casing and can be applied to horizontal wells, directional wells, vertical wells and other working conditions.

[0062] In one embodiment, such as Figure 1As shown, the power source 94 includes a submersible permanent magnet motor 941, a power cable 942, a motor protector 943, and a downhole condition monitoring device 944. The submersible permanent magnet motor 941 is connected to the bottom of the screw pump 93 and is used to control the operation of the screw pump 93. The bottom of the power cable 942 is connected to the submersible permanent magnet motor 941, and the top passes through the cable packer 5 and is connected to the external power facility. The motor protector 943 is connected to the submersible permanent magnet motor 941 to protect the submersible permanent magnet motor 941. The downhole condition monitoring device 944 is connected to the bottom of the submersible permanent magnet motor 941 to monitor the reservoir information in the production annulus 8 in real time.

[0063] In this embodiment, the downhole condition monitoring device 944 includes, but is not limited to, pressure sensors, temperature sensors, etc., to monitor the temperature and pressure signals of the reservoir within the production annulus 8 in real time.

[0064] In one embodiment, such as Figure 1 As shown, a dual-channel check valve 10 is connected to the oil-water separation pipe 91. The dual-channel check valve 10 is used to restrict the backflow of oil and water toward the oil-water separator 92. That is, after oil-water separation, oil and water can only enter the oil-water separation pipe 91 to ensure the smooth progress of oil production operations.

[0065] In one embodiment, such as Figure 1 As shown, the tubing assembly 2 includes a production tubing 21 fixedly connected to the bottom of the tree 1. A downhole safety valve 22 and a flow sensor 23 are connected to the production tubing 21. The downhole safety valve 22 is located above the cable packer 5, and the flow sensor 23 is located below the cable packer 5 and is used to monitor the amount of oil produced in real time.

[0066] In one embodiment, such as Figure 1 As shown, a multi-channel Y-type separator 24 is fixedly connected to the bottom of the oil production pipe 21. The multi-channel Y-type separator 24 is equipped with an oil channel and a water channel (not shown in the figure). The oil drain pipe in the oil-water separation pipe 91 is connected to the oil channel, and the drain pipe is connected to the water channel. That is, after oil-water separation, oil enters the oil production pipe 21 through the oil channel, and water enters the water channel.

[0067] In one embodiment, such as Figure 1 As shown, the bottom of the multi-channel Y-type hanger 24 is fixedly connected to the reinjection assembly 25. The top of the reinjection assembly 25 is connected to the water channel inside the multi-channel Y-type hanger 24, and the bottom is connected to the bridge assembly 4. The water after oil-water separation can be injected into the reinjection layer 7 through the reinjection assembly 25, thereby realizing injection and production in the same well.

[0068] In one embodiment, such as Figure 1As shown, the reinjection assembly 25 includes a reinjection pipe 251, a two-way valve 252, a injection monitoring and control device 253, and a signal cable 254. The top of the reinjection pipe 251 is connected to the water channel in the multi-channel Y-type hanger 24, and the bottom is connected to the bridge assembly 4. The two-way valve 252 and the injection monitoring and control device 253 are respectively connected to the reinjection pipe 251, and the injection monitoring and control device 253 is located below the two-way valve 252. The bottom of the signal cable 254 is connected to the injection monitoring and control device 253, and the top passes through the cable packer 5 and is connected to the external power facility.

[0069] In this embodiment, the bidirectional valve 252 has two functions: firstly, to provide an injection channel for the unblocking fluid during the unblocking process; and secondly, to provide a backwash channel during the backwashing process. The injection monitoring and control device 253 includes, but is not limited to, sensors, control valves, and other monitoring and control devices to measure parameters such as injection flow rate, injection pressure, production annulus pressure, and bottom hole temperature. It also enables continuous control of the injection volume, ensuring that the injection pressure and volume meet design requirements while maintaining a high oil-water separation ratio.

[0070] In one embodiment, such as Figure 1 As shown, the injection-production packer assembly 3 includes an injection-production pipe 31, a top packer 32, and an interlayer packer 33. The injection-production pipe 31 is connected to the bottom of the reinjection pipe 251 via a bridge assembly 4. The top packer 32 and the interlayer packer 33 are respectively disposed on the injection-production pipe 31, with the interlayer packer 33 located below the top packer 32. When the top packer 32 and the interlayer packer 33 are respectively set on the inner wall of the wellbore, a production layer 6 is formed between the top packer 32 and the interlayer packer 33, and a reinjection layer 7 is formed below the interlayer packer 33, thereby realizing the stratification of the wellbore and enabling the well completion structure to have stratified production capability.

[0071] In one embodiment, such as Figure 1 As shown, the bridge assembly 4 includes a bridge positioner 41 and a bridge dispenser 42. The bridge positioner 41 is connected to the top of the injection-production pipe 31 and to the reinjection pipe 251. Simultaneously, the top packer 32 is fixedly connected to the bridge positioner 41. The bridge dispenser 42 is fixedly connected to the injection-production pipe 31 and is located between the top packer 32 and the interlayer packer 33. Furthermore, the bridge positioner 41 and the bridge dispenser 42 are respectively provided with interconnected bridge channels to connect the production layer 6 and the annulus 8.

[0072] The oil-water separation and injection-production well completion structure in this embodiment is used as follows:

[0073] (1) Same well injection and production

[0074] like Figure 2As shown, the production tree 1, production tubing 21, multi-channel Y-type hanger 24, oil-water separator 91, oil-water separator 92, screw pump 93, and power source 94 constitute the production channel. The multi-channel Y-type hanger 24, bidirectional valve 252, reinjection pipe 251, and injection-production pipe 31 constitute the reinjection channel. That is, the oil reservoir in the production layer 6 enters the production annulus 8 through the bridge-type pipes of bridge positioner 41 and bridge injector 42. Power source 94 drives screw pump 93 to work, and screw pump 93 pressurizes and delivers the oil reservoir to oil-water separator 92. Subsequently, oil-water separator 92 separates the oil reservoir. The oil phase is extracted through the production channel, and the water phase enters the reinjection layer 7 through the reinjection channel, thereby realizing injection and production in the same well.

[0075] (2) Unblocking the reinjection layer

[0076] like Figure 3 As shown, the unblocking fluid is injected into the production pipe 21. The unblocking fluid enters the reinjection pipe 251 through the two-way valve 252, and finally enters the reinjection layer 7 through the injection-production pipe 31, flushing out the flocculent blockage in the reinjection layer 7, thereby unblocking the reinjection layer 7.

[0077] (3) Unblocking of the production layer

[0078] like Figure 4 As shown, the unblocking fluid is injected into the annulus 8 of the oil production zone. The unblocking fluid enters the production zone 6 through the bridge channel and flushes the production zone 6 before finally being discharged into the formation, thereby unblocking the production zone 6.

[0079] (4) Backwashing well

[0080] like Figure 5 As shown, the part of the reinjection pipe 251 below the two-way valve 252 is closed by the injection monitoring and control device 253, and the bridge assembly 4 is closed. The well washing fluid is injected into the production annulus 8. When the well pressure in the production annulus 8 reaches a certain value, the two-way valve 252 is automatically opened. At this time, the well washing fluid enters the reinjection pipe 251 through the two-way valve 252, and enters the production pipe 21 through the multi-channel Y-type hanger 24. Finally, it is discharged through the production pipe 21, thereby realizing the well washing.

[0081] As can be seen from the above, this device has the following advantages:

[0082] (1) The downhole parallel cyclone oil-water separator adopts micro cyclone technology, which has high separation efficiency and large processing capacity to improve oil production efficiency.

[0083] (2) The formation produced fluid is pressurized by screw pump 93 and then separated into oil and water. Since screw pump 93 is a positive displacement pump, it has no shearing action and has little emulsification effect on oil droplets, which can minimize the impact on oil-water separation efficiency.

[0084] (3) The injection monitoring and control device 253, together with the two-way valve 252, can realize the functions of acidizing and unblocking the injection and production layers, well fluid backflow, and well backwashing, making the process integration more comprehensive;

[0085] (4) The permanent magnet screw pump 93 provides the pump lifting and reinjection drive source, which makes the system more efficient and more energy-saving.

[0086] It should be noted that, unless otherwise stated, the technical or scientific terms used in this invention should have the ordinary meaning as understood by one of ordinary skill in the art.

[0087] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A well completion structure for oil-water separation and simultaneous injection and production, characterized in that, include: A tree (1) is used to fix the top of the casing; The tubing assembly (2) is connected to the bottom of the tree (1) and is used to be lowered into the casing; The injection-production isolation assembly (3) is located at the bottom of the tubing assembly (2) and is used to divide the casing into a production layer (6) and a reinjection layer (7). A cable packer (5) is connected to the upper end of the tubing assembly (2), and an oil production annulus (8) is formed between the cable packer (5) and the injection-production packer assembly (3); A bridge assembly (4) connects the tubing assembly (2) and the injection-production isolation assembly (3), and the bridge assembly (4) is provided with a bridge channel connecting the production layer (6) and the production annulus (8); The oil-water separation assembly (9) is connected to the oil pipe assembly (2) and is located within the oil production annulus (8); The oil-water separation assembly (9) includes: An oil-water separator (91) is connected to the oil pipe assembly (2); An oil-water separator (92) is connected to the bottom of the oil-water separation pipe (91); A screw pump (93) is connected to the bottom of the oil-water separator (92). The screw pump (93) is used to pressurize the oil reservoir and deliver it to the oil-water separator (92). A power source (94) is connected to the screw pump (93) and provides power to the screw pump (93).

2. The oil-water separation and simultaneous injection-production well completion structure according to claim 1, characterized in that, The power source (94) includes: A submersible permanent magnet motor (941) is connected to the bottom of the screw pump (93); The power cable (942) is connected at the bottom to the submersible permanent magnet motor (941), passes through the cable packer (5) at the top, and is connected to the external power facility; A motor protector (943) is connected to the submersible permanent magnet motor (941).

3. The oil-water separation and simultaneous injection-production completion structure according to claim 2, characterized in that, The bottom of the submersible permanent magnet motor (941) is connected to a downhole operating condition monitoring device (944) to monitor the reservoir information in the production annulus (8) in real time.

4. The oil-water separation and simultaneous injection-production well completion structure according to claim 2, characterized in that, A dual-channel check valve (10) is connected to the oil-water separation pipe (91), and the dual-channel check valve (10) is used to restrict the backflow of oil and water toward the oil-water separator (92).

5. The oil-water separation and simultaneous injection-production well completion structure according to claim 1, characterized in that, The oil pipe assembly (2) includes: Oil production tubing (21) is connected to the bottom of the tree (1); A multi-channel Y-type splitter hanger (24) is connected to the bottom of the oil production pipe (21). The multi-channel Y-type splitter hanger (24) is provided with an oil channel and a water channel. The oil drain pipe in the oil-water separation pipe (91) is connected to the oil channel, and the drain pipe is connected to the water channel. The reinjection assembly (25) is connected at the top to the water channel in the multi-channel Y-type hanger (24) and at the bottom to the bridge assembly (4), and the separated water can be injected into the reinjection layer (7) through the reinjection assembly (25).

6. The oil-water separation and simultaneous injection-production completion structure according to claim 5, characterized in that, The reinjection assembly (25) includes: The return pipe (251) is connected at the top to the water channel in the multi-channel Y-type hanger (24) and at the bottom to the bridge assembly (4); A two-way valve (252) is connected to the reinjection pipe (251) and is used to provide a channel for injecting unblocking fluid during unblocking and a channel for backwashing during well backwashing. The injection monitoring and control device (253) is connected to the reinjection pipe (251) and located below the two-way valve (252). The injection monitoring and control device (253) is used to monitor the information in the oil production annulus (8) and continuously control the injection volume. The signal cable (254) is connected at the bottom to the injection monitoring and control device (253), passes through the cable seal (5) at the top, and is connected to the external power facility.

7. The oil-water separation and simultaneous injection-production completion structure according to claim 5, characterized in that, The oil production pipe (21) is connected to a downhole safety valve (22), and the downhole safety valve (22) is located above the cable packer (5).

8. The oil-water separation and simultaneous injection-production well completion structure according to claim 5, characterized in that, A flow sensor (23) is connected to the oil production pipe (21) to monitor the amount of oil produced.

9. The oil-water separation and simultaneous injection-production well completion structure according to claim 1, characterized in that, The injection-production sealing assembly (3) includes: The injection and production pipe (31) is connected to the bottom of the tubing assembly (2) via the bridge assembly (4); A top packer (32) is disposed on the injection / production tube (31); Interlayer packer (33) is connected to the injection-production tube (31) and located below the top packer (32); The production layer (6) is formed between the top packer (32) and the interlayer packer (33), and the reinjection layer (7) is formed below the interlayer packer (33).

10. The oil-water separation and simultaneous injection-production completion structure according to claim 9, characterized in that, The bridge assembly (4) includes: A bridge positioner (41) is connected to the top of the injection and production pipe (31) and to the reinjection pipe (251), and the top packer (32) is connected to the bridge positioner (41). A bridge-type injection device (42) is connected to the injection tube (31) and located between the top packer (32) and the interlayer packer (33); The bridge positioner (41) and the bridge dispenser (42) are respectively provided with interconnected bridge channels.

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