A same-well injection and production device based on hydraulic power drive

Abstract

This invention belongs to the technical field of oil extraction, specifically relating to a hydraulically driven intra-well injection and production device. The invention includes an injection pipe, a production pipe, a diverter, and a multi-channel converter arranged in the wellbore. The injection pipe is sleeved within the production pipe, with an annulus between them. The diverter connects the injection pipe and the production pipe, and the injection pipe and production pipe communicate within the diverter. The upper end of the multi-channel converter is connected to the diverter, and the multi-channel converter has two channels: one channel communicates with the injection pipe via the diverter and penetrates into the injection layer; the other channel communicates with the production layer and connects with the production pipe via the diverter. A hydraulic pump core connected to the production pipe is installed in the diverter. This invention utilizes hydraulic power as a power source, creating a diversion in the wellbore. One portion is injected into the target layer, and the other portion is lifted to the surface using a hydraulic jet pump principle, achieving intra-well injection and production through a single power source downhole.

Description

Technical Field

[0001] This invention belongs to the technical field of oil extraction, specifically relating to a hydraulically driven injection and production device for the same well. Background Technology

[0002] In-well injection and production technology refers to the separation of oil and water downhole, with the separated water reinjected into the injection layer and the remaining oil-rich oil-water mixture lifted to the surface.

[0003] Chinese Patent Publication No. CN202010206669.1 discloses a downhole oil-water separation co-production system and tubing, which includes a lift system, an oil-water separation system and a reinjection system connected sequentially from top to bottom. The oil-water separation system has an oil-water inlet connected to the production layer, an oil outlet connected to the lift system, and a water outlet connected to the reinjection system. The reinjection system is connected to the water injection layer. The oil-water mixture from the production layer enters the oil-water separation system through the oil-water inlet. The oil-water separation system separates the oil-water mixture into separated oil-rich oil and separated water. The separated oil flows out from the oil outlet and is extracted through the lift system. The separated water flows out from the water outlet and is reinjected into the water injection layer through the reinjection system.

[0004] Chinese Patent Publication No. CN200610170706.8 discloses a method for achieving simultaneous injection and production in high water-cut wells using a multi-cup isofluid downhole oil-water separator. This method utilizes a multi-cup isofluid downhole oil-water separator to allow the produced fluid from the produced layer to naturally settle as it flows through the settling cups in the separator downhole. After oil-water separation, two lifting devices are used to lift and reinject the fluid through independent fluid flow channels. These two lifting devices are referred to as the production pump and the injection pump, respectively. The produced fluid with lower water content is lifted to the surface by the production pump through the fluid flow channel of the production pump, while the produced fluid with higher water content is reinjected into the injection layer by the injection pump through the fluid flow channel of the injection pump.

[0005] One limitation of existing patented technologies is that they are only applicable to wellbores with an inclination angle of less than 15°, limiting their use for wells with large inclinations and restricting their application on a block-scale basis. A second limitation is the limited separation efficiency. Using cyclone separation or multi-cup separation in the wellbore affects the separation efficiency, only allowing for simultaneous injection and production in oil wells with a water cut greater than 90%. This imposes stringent well selection conditions, which most oil wells cannot meet. Summary of the Invention

[0006] This application provides a hydraulically driven co-injection and production device that uses hydraulic power as a power source to create a diversion in the wellbore. One part is injected into the target layer, and the other part is lifted to the surface by the principle of a hydraulic jet pump. Co-injection and production are achieved downhole using the same power source.

[0007] This application discloses a hydraulically driven injection-production device for the same well, which adopts the following technical solution:

[0008] A hydraulically driven injection-production device for the same well includes an injection pipe, a production pipe, a diverter, and a multi-channel converter arranged in the wellbore.

[0009] The injection tube is sleeved inside the production tube and there is an annular space between them;

[0010] The splitter is connected to the injection pipe and the collection pipe, and the injection pipe and the collection pipe are in communication within the splitter;

[0011] The upper end of the multi-channel converter is connected to the splitter, and the multi-channel converter has two channels. One channel is connected to the injection tube via the splitter and passes through the injection layer; the other channel is connected to the extraction layer and is connected to the extraction tube via the splitter.

[0012] The distributor is equipped with a hydraulic pump core that is connected to the production pipe. The hydraulic pump core is used to output the produced fluid to the production pipe via a multi-channel converter and distributor, and then output it to the ground via the production pipe.

[0013] By adopting the above technical solution, high-pressure fluid flows downward from the annulus formed by the injection pipe and the production pipe, forming a split in the distributor. A portion of the fluid in the distributor flows into the multi-channel converter through the split pipe, while a portion of the high-pressure fluid is injected into the injection layer through the multi-channel converter, increasing the water volume in the injection layer and squeezing the low-water-content product fluid in the production layer. This low-water-content product fluid is then sent through the multi-channel converter into the production pipe and extracted to the surface. The other portion of the fluid in the distributor enters the connecting pipe directly opposite the fluid inlet of the hydraulic pump core. The hydraulic pump core has a siphon effect, lifting the produced layer liquid upward along the production pipe and to the surface.

[0014] Optionally, the diverter includes a diverter pipe connected to the injection pipe, a baffle plate fixedly connected in the diverter pipe to close the upper and lower parts of the diverter pipe, and a connecting pipe fixedly connected to the baffle plate and connected to the extraction pipe.

[0015] There is an annular space between the connecting pipe and the diverter pipe, and the connecting pipe passes through the baffle, connecting the upper and lower parts of the baffle; a connecting hole is provided on the baffle, which connects the upper and lower parts of the diverter pipe; a through hole is provided through the connecting pipe, which connects the connecting pipe and the diverter pipe; the hydraulic pump core is installed in the connecting pipe.

[0016] By adopting the above technical solution, a portion of the fluid in the distributor flows into the multi-channel converter through the distributor pipe and the connecting hole on the baffle, while another portion of the fluid in the distributor flows into the connecting pipe through the through hole. The fluid entering the connecting pipe is directly opposite the fluid inlet of the hydraulic pump core.

[0017] Optionally, the multi-channel converter includes an installation pipe, through which a closed-end arrangement pipe is inserted. The upper end of the arrangement pipe is open, and there is an annular space between the arrangement pipe and the installation pipe. Multiple return pipes are arranged between the arrangement pipe and the installation pipe. One end of the return pipe is fixedly connected to the inner wall of the installation pipe, and the other end is fixedly connected to the inner wall of the arrangement pipe. The return pipes communicate with the inside of the arrangement pipes and with the outside of the installation pipes. When the multi-channel converter is arranged in the wellbore, the opening of the return pipe is aligned with the produced layer, and the lower end of the multi-channel converter is arranged at the injection layer.

[0018] By adopting the above technical solution

[0019] Optionally, a water injection section is installed at the lower end of the multi-channel converter. The water injection section is a cylindrical shape with one end closed, and multiple water outlet holes are opened through the water injection section. The water outlet holes are horizontally opened and aligned with the injection layer.

[0020] By adopting the above technical solution, high-pressure fluid is injected into the injection layer through the installation pipe of the multi-channel converter, squeezing the low-water-cut product fluid in the production layer. The low-water-cut product fluid then flows into the arrangement pipe through the return pipe in the multi-channel converter, and then into the connecting pipe in the distributor. After passing through the connecting pipe, it enters the production pipe and is extracted to the surface through the production pipe.

[0021] Optionally, a packer is fitted onto the multi-channel converter. The packer is arranged in the wellbore and closely adheres to the wellbore wall to separate the produced layer from the injected layer.

[0022] By adopting the above technical solution, the packer isolates the injection layer and the produced layer.

[0023] Optionally, a check valve is installed in the mounting pipe of the multi-channel device, and the check valve is arranged on the upper side of the water injection section.

[0024] By adopting the above technical solution, it is possible to prevent the injection layer pressure from being too high and causing reverse flow in the wellbore when injection is stopped.

[0025] Optionally, a stepped groove is provided on the inner wall of the connecting pipe, and the hydraulic pump core is attached to the stepped groove.

[0026] By adopting the above technical solution, the hydraulic pump core is attached to the stepped groove, and the installation of the hydraulic pump core is positioned.

[0027] Optionally, the injection pipe is threaded to the diversion pipe; the extraction pipe is threaded to the connecting pipe.

[0028] Optionally, the multichannel converter is threadedly connected to the shunt.

[0029] Optionally, the upper end of the water-filled stub is threaded to the lower end of the multi-channel converter.

[0030] The beneficial effects of this invention are as follows: by setting up a hydraulically driven injection and production device, using hydraulic power as the power source, a diversion is formed in the wellbore. One part is injected into the injection layer, and the other part is lifted to the surface by the principle of hydraulic jet pump. The same power source is used to achieve injection and production in the well. Attached Figure Description

[0031] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0032] Figure 1 This is a schematic diagram of the hydraulically driven injection and production device in this embodiment;

[0033] Figure 2 This is a schematic diagram of the splitter in this embodiment;

[0034] Figure 3 This is a schematic diagram of the splitter structure in this embodiment;

[0035] Figure 4 This is a schematic diagram of the multi-channel converter in this embodiment;

[0036] Figure 5 This is a schematic diagram of the structure of the multi-channel converter in this embodiment.

[0037] Explanation of reference numerals in the attached diagram: 1. Injection pipe; 2. Outlet pipe; 3. Diverter; 31. Diverter pipe; 32. Baffle; 33. Connecting pipe; 34. Connecting hole; 35. Through hole; 4. Multi-channel converter; 41. Mounting pipe; 42. Arrangement pipe; 43. Return pipe; 5. Water injection sub; 51. Outlet hole; 6. Packer; 7. Check valve. Detailed Implementation

[0038] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] This invention provides a hydraulically driven same-well injection and production device, with reference to... Figure 1 The hydraulically driven injection-production device includes an injection pipe 1, a production pipe 2, a diverter 3, a multi-channel converter 4, a water injection sub 5, and a packer 6, all arranged in the wellbore.

[0041] Injection pipe 1 is arranged in the wellbore, spaced apart from the inner wall of the wellbore, and is used to inject high-pressure fluid into the well.

[0042] The production pipe 2 is arranged in the injection pipe 1, and the injection pipe 1 is sleeved in the production pipe 2. There is an annulus between the injection pipe 1 and the production pipe 2. The production pipe 2 is used to transport the produced fluid from downhole to the surface.

[0043] Reference Figure 2 , Figure 3 A diverter 3 is arranged below the production pipe 2 and the injection pipe 1. The diverter 3 includes a diverter pipe 31 connected to the injection pipe 1. A baffle 32, which closes the diverter pipe 31 vertically, is fixedly connected to the diverter pipe 31. A connecting pipe 33, which connects to the production pipe 2, is fixedly connected to the baffle 32. An annular space exists between the connecting pipe 33 and the diverter pipe 31, and the connecting pipe 33 passes through the baffle 32, connecting the baffle 32 vertically. A connecting hole 34 is provided on the baffle 32, connecting the diverter pipe 31 vertically. A through hole 35 is provided through the connecting pipe 33, connecting the connecting pipe 33 and the diverter pipe 31. A hydraulic pump core is installed on the inner wall of the connecting pipe 33, which is used to output the produced fluid to the production pipe 2 via the connecting pipe 33. A stepped groove is provided on the inner wall of the connecting pipe 33, and the hydraulic pump core overlaps the stepped groove for positioning. When the diverter 3 is connected to the extraction pipe 2 and the injection pipe 1, the injection pipe 1 is threadedly connected to the diverter 31, and the connection is sealed. The extraction pipe 2 is threadedly connected to the connecting pipe 33, and the connection is sealed.

[0044] Reference Figure 4 , Figure 5 A multi-channel converter 4 is arranged below the splitter 3 and connected to it. The multi-channel converter 4 includes a mounting tube 41, which is connected to the splitter tube 31 via a threaded connection and sealed at the connection point. A closed-end arrangement tube 42 passes through the mounting tube 41, with an open upper end and an annular space between it and the mounting tube 41. When the multi-channel converter 4 is connected to the splitter 3, the arrangement tube 42 communicates with the connecting tube 33. Multiple return tubes 43 are arranged between the arrangement tube 42 and the mounting tube 41. One end of each return tube 43 is fixedly connected to the inner wall of the mounting tube 41, and the other end is fixedly connected to the inner wall of the arrangement tube 42. The return tubes 43 communicate both internally with the arrangement tubes 42 and externally with the mounting tubes 41.

[0045] When the multi-channel converter 4 is arranged in the wellbore, the inlet of the return pipe 43 is aligned with the produced layer, and the lower end of the multi-channel converter 4 is arranged at the injection layer.

[0046] Water injection section 5 is arranged below the multi-channel converter 4. Water injection section 5 is a cylindrical shape with one end closed. The upper end of water injection section 5 is threaded to the lower end of mounting pipe 41, connecting water injection section 5 and mounting pipe 41. Multiple water outlet holes 51 are opened through water injection section 5. The water outlet holes 51 are opened horizontally and aligned with the injection layer.

[0047] A packer 6 is fitted onto the multi-channel converter 4. The packer 6 is arranged in the wellbore and is in close contact with the wellbore wall to separate the produced layer from the injected layer. Furthermore, a check valve 7 is installed in the installation pipe 41 of the multi-channel device. The check valve 7 is arranged on the upper side of the water injection subsection 5.

[0048] The method of using a hydraulically driven injection-production device disclosed in this application is as follows: A packer 6 isolates the injection layer and the production layer, and a hydraulic pump core is arranged in a distributor 3 via the production pipe 2. High-pressure fluid flows downward from the annulus formed by the injection pipe 1 and the production pipe 2, forming a split in the distributor 3. A portion of the fluid in the distributor 3 flows through the distributor pipe 31 and through the connecting hole 34 on the baffle 32 into the multi-channel converter 4. A portion of the high-pressure fluid flows through the mounting pipe 41 of the multi-channel converter 4, through the check valve 7, and into the water injection sub-section 5. This water injection sub-section 5 injects the fluid into the injection layer, increasing the water volume in the injection layer and squeezing out the low-water-content product fluid in the production layer. The low-water-content product fluid flows through the return pipe 43 in the multi-channel converter 4 into the arrangement pipe 42, and then through the arrangement pipe 42 into the connecting pipe 33 in the distributor 3. After passing through the connecting pipe 33, it enters the production pipe 2 and is extracted to the surface via the production pipe 2.

[0049] Another portion of the fluid in the distributor 3 flows into the connecting pipe 33 through the through hole 35. The fluid entering the connecting pipe 33 is directly opposite the fluid inlet of the hydraulic pump core. The hydraulic pump core has a siphon effect, which lifts the produced liquid along the produced pipe 2 upward and to the ground.

[0050] By setting up a hydraulically driven co-injection and production device, water is used as the power source to form a diversion in the wellbore. One part is injected into the injection layer, and the other part is lifted to the surface by the principle of hydraulic jet pump. Co-injection and production are achieved downhole through the same power source.

[0051] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0052] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A hydraulically driven injection-production device for the same well, characterized in that: Includes an injection pipe (1), a production pipe (2), a splitter (3), and a multi-channel converter (4) arranged in the wellbore; The injection pipe (1) is sleeved in the extraction pipe (2) and there is an annular space between them; The splitter (3) is connected to the injection pipe (1) and the extraction pipe (2), and the injection pipe (1) and the extraction pipe (2) are connected in the splitter (3); The upper end of the multi-channel converter (4) is connected to the splitter (3), and there are two channels in the multi-channel converter (4). One channel is connected to the injection pipe (1) via the splitter (3) and passes through the injection layer; the other channel is connected to the extraction layer and is connected to the extraction pipe (2) via the splitter (3). The diverter (3) is equipped with a hydraulic pump core that is connected to the extraction pipe (2). The hydraulic pump core is used to output the extracted fluid to the extraction pipe (2) via the multi-channel converter (4) and the diverter (3), and then output it to the ground via the extraction pipe (2).

2. The hydraulically driven injection-production device for the same well as described in claim 1, characterized in that: The diverter (3) includes a diverter pipe (31) connected to the injection pipe (1), a baffle (32) fixedly connected in the diverter pipe (31) to close the diverter pipe (31) from top to bottom, and a connecting pipe (33) fixedly connected to the baffle (32) and connected to the extraction pipe (2). There is an annular space between the connecting pipe (33) and the diversion pipe (31), and the connecting pipe (33) passes through the baffle (32) to connect the baffle (32) vertically; a connecting hole (34) is provided on the baffle (32) to connect the diversion pipe (31) vertically; a through hole (35) is provided on the connecting pipe (33) to connect the connecting pipe (33) and the diversion pipe (31); the hydraulic pump core is installed in the connecting pipe (33).

3. The hydraulically driven injection-production device for the same well as described in claim 1, characterized in that: The multi-channel converter (4) includes an installation pipe (41), through which a closed-end arrangement pipe (42) is inserted. The upper end of the arrangement pipe (42) is open, and there is an annular space between it and the installation pipe (41). Multiple return pipes (43) are arranged between the arrangement pipe (42) and the installation pipe (41). One end of the return pipe (43) is fixedly connected to the inner wall of the installation pipe (41), and the other end is fixedly connected to the inner wall of the arrangement pipe (42). The return pipe (43) communicates with the inside of the arrangement pipe (42) and with the outside of the installation pipe (41). When the multi-channel converter (4) is arranged in the wellbore, the opening of the return pipe (43) is aligned with the production layer, and the lower end of the multi-channel converter (4) is arranged at the injection layer.

4. The hydraulically driven injection-production device for the same well as described in claim 1, characterized in that: The multi-channel converter (4) is equipped with a water injection section (5) at its lower end. The water injection section (5) is a cylindrical shape with one end closed. Multiple water outlet holes (51) are opened through the water injection section (5). The water outlet holes (51) are opened horizontally and aligned with the injection layer.

5. The hydraulically driven injection-production device for the same well as described in claim 1, characterized in that: A packer (6) is fitted on the multi-channel converter (4). The packer (6) is arranged in the wellbore and is in close contact with the wellbore wall to separate the produced layer from the injected layer.

6. The hydraulically driven injection-production device for the same well as described in claim 3, characterized in that: A check valve (7) is installed in the installation pipe (41) of the multi-channel device, and the check valve (7) is arranged on the upper side of the water injection section (5).

7. The hydraulically driven injection-production device for the same well as described in claim 2, characterized in that: A stepped groove is provided on the inner wall of the connecting pipe (33), and the hydraulic pump core is attached to the stepped groove.

8. The hydraulically driven injection-production device for the same well as described in claim 2, characterized in that: The injection pipe (1) is threadedly connected to the diversion pipe (31); the extraction pipe (2) is threadedly connected to the connecting pipe (33).

9. The hydraulically driven injection-production device for the same well as described in claim 1, characterized in that: The multichannel converter (4) is threadedly connected to the shunt (3).

10. The hydraulically driven injection-production device for the same well as described in claim 4, characterized in that: The upper end of the water-filling short section (5) is threadedly connected to the lower end of the multi-channel converter (4).

Images