Integrated packer water injection and production pipe string and same-well injection and production process method using the pipe string

Abstract

The present invention relates to the technical field of co-well injection and production. Specifically disclosed are an integrated packer water distribution pipe string and a co-well injection and production process method using this pipe string, which have an oil production pipeline, a water intake pipeline, a reinjection pipeline adapted to co-well injection and production, and a plurality of capillary tubes for water distributors controlling different water injection layers, so as to be able to open the switch of a single water distributor to inject water into a single-stage water injection layer, or open the switches of multiple water distributors to inject water into a multi-stage water injection layer, realizing precise dynamic adjustment of reinjection.

Description

Technical Field

[0001] The present invention relates to the technical field of co - well injection and production, and particularly to an integrated packer and water distribution pipe string and a co - well injection and production process method using the pipe string. Background Art

[0002] At present, the oilfield water injection plan requires that the reinjection layer should meet three to five sections, and each section should be separated by a packer. In co - well injection and production, packers are used to separate multiple reinjection layers underground. Limited by the current injection and production pipe string tools, reinjection can only be carried out to multiple reinjection layers simultaneously. Since the reinjection layer is composed of multiple oil layers and there are large differences in inter - layer permeability, that is, the water absorption capacity of each oil layer is different under the same injection pressure, this leads to the reinjection layer can only be injected with water generally. To carry out layered water injection according to the requirements of the oilfield water injection plan, the requirement of multi - stage fine water injection pursued by oilfield development cannot be achieved. This results in the proportion of the water absorption thickness of oil layers with different properties not being able to increase, seriously affecting the swept volume of the injected water. Therefore, in order to implement the requirements of the pressure - sharing and layered water injection process, an integrated packer and water distribution pipe string for a single - pump co - well injection and production process adapted to layered control of reinjected water is needed. Summary of the Invention

[0003] The purpose of the present invention is to provide an integrated packer and water distribution pipe string and a co - well injection and production process method using the pipe string for the defects existing in the prior art. It has an oil - taking pipeline, a water - taking pipeline, a reinjection pipeline adapted to co - well injection and production, and capillary tubes of multiple water distributors for controlling different water injection layers, so as to be able to open the switch of a single water distributor to inject water into a single - stage water injection layer, or open the switches of multiple water distributors to inject water into a multi - stage water injection layer, realizing precise dynamic adjustment of reinjection.

[0004] The technical solution of the present invention is: an integrated packer and water distribution pipe string, including an oil pipe, a water pipe and a tool pipe arranged from the inside to the outside. An annular upper - water channel is formed between the oil pipe and the water pipe, and an annular water injection channel is formed between the water pipe and the tool pipe. A group of capillary tubes arranged in a circular pattern are provided in the water injection channel;

[0005] The tool pipe includes an upper joint, a packer and a water distributor connected in sequence from top to bottom. The pressure - transmitting and setting hole of the packer is communicated with the water injection channel. The water distributor includes a cylindrical main body. A valve cavity and an outer diversion hole communicating the valve cavity with the water injection channel are opened on the cylindrical wall of the cylindrical main body. A valve sleeve is connected to the inner bottom of the valve cavity. An inner diversion hole communicating with the outer diversion hole is opened on the valve sleeve. A valve core slidably and sealingly connected with the inner diversion hole is arranged in the valve sleeve. After the upper end of the valve core extends out of the valve sleeve, a piston head slidably and sealingly connected with the valve cavity is provided.

[0006] A set of liquid inlet channels corresponding to the inlet ends of the capillary tubes one by one are formed in the upper joint. The outlet end of one of the capillary tubes communicates with the top of the valve cavity, and the outlet ends of the remaining capillary tubes communicate with a set of liquid outlet channels formed in the cylindrical body one by one.

[0007] Preferably, a pressure transmission hole is further formed in the wall of the cylindrical body, and the pressure transmission hole communicates the annular space between the valve core and the valve cavity with the water injection channel.

[0008] Preferably, the bottom of the valve core is in a conical structure, and a conical surface for cooperating with and limiting the bottom of the valve core is provided at the bottom of the inner cavity of the valve sleeve.

[0009] A same-well injection and production process method uses the above integrated packer and water distribution pipe string;

[0010] The same-well injection and production process method includes the following steps:

[0011] First, a plurality of integrated packer and water distribution pipe strings are connected from top to bottom to form a tool string. The adjacent upper and lower oil pipes are connected into an oil production pipeline, the adjacent upper and lower water pipes are connected into a water intake pipeline, and the adjacent upper and lower water injection channels are connected into a reinjection pipeline;

[0012] Only one of a set of capillary tubes of the integrated packer and water distribution pipe string located above communicates with the valve cavity for switching the water distributor, and the bottoms of the remaining capillary tubes are connected to the tops of the capillary tubes of the integrated packer and water distribution pipe string located below. Connecting downward in this way forms a plurality of capillary tube strings for driving the switches of different water distributors;

[0013] Then, the tool string and the injection-production pump are lowered into the injection-production well. The inlet ends of the injection-production pump are respectively communicated with the oil production pipeline and the water intake pipeline, an oil production valve is installed on the oil production pipeline, and a water intake valve is installed on the water intake pipeline;

[0014] The outlet ends of the injection-production pump are respectively connected to the production pipeline pumped out of the ground and the reinjection pipeline pumped into the well through pipelines. A production valve is installed on the production pipeline, and a reinjection valve is installed on the reinjection pipeline;

[0015] A pressure transmission branch extending to the ground is also connected to the reinjection pipeline and is connected to the pressure detection module through the pressure transmission branch;

[0016] During the packer setting operation: open the water intake valve and the reinjection valve, close the oil production valve and the production valve, pump the well water into the reinjection pipeline through the water intake pipeline, the injection-production pump, and the reinjection pipeline. At this time, all the water distributors are in the closed state, and the hydraulic pressure drives each stage of the packer to set through each pressure transmission setting hole, forming multiple water injection layers arranged vertically, and a water distributor is equipped at each water injection layer;

[0017] During oil production operation: Open the oil extraction valve and the production valve, close the water intake valve and the reinjection valve, and pump the oil fluid to the ground through the oil extraction pipeline, the injection-production pump, and the production pipeline;

[0018] During water injection operation: Open the water intake valve and the reinjection valve, close the oil extraction valve and the production valve, pump the well water into the water injection layer through the water intake pipeline, the injection-production pump, and the reinjection pipeline, and during the water injection process, the water injection pressure is detected in real time by the pressure detection module, and according to the change of the water injection pressure, by injecting pressure into different capillaries, the single distributor switch is opened to inject water into the single-stage water injection layer, or multiple distributor switches are opened to adjust the position and injection volume of the reinjected water for the multi-stage water injection layer.

[0019] Preferably, a ground controller and a hydraulic pump are also adopted in the same-well injection-production process method;

[0020] Establish an electrical connection between the ground controller, the hydraulic pump, and the pressure detection module, and control the opening and closing of the oil extraction valve, the water intake valve, the production valve, and the reinjection valve through the ground controller;

[0021] The hydraulic outlet of the hydraulic pump is respectively communicated with the capillaries connecting each distributor through the pressure injection pipeline, and a pressure control valve is provided on each pressure injection pipeline entering the distributor, and both the pressure control valve and the hydraulic pump are electrically connected to the ground controller.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] The present invention has an oil extraction pipeline, a water intake pipeline, a reinjection pipeline adapted to the same-well injection-production, and multiple capillaries for controlling distributors of different water injection layers, so that the single distributor switch can be opened to inject water into the single-stage water injection layer, or multiple distributor switches can be opened to inject water into the multi-stage water injection layer, realizing precise dynamic adjustment of reinjection, thereby adapting to and promoting the process development of the same-well single-pump injection-production.

[0024] The present invention adopts a single-pump operation structure, which is simple and has high stability. The single pump is paired with a group of oil fluid production pipelines and a group of separated water reinjection pipelines, and can be switched between oil production operation and water injection operation at will according to the operation needs, which is very flexible and convenient. More importantly, the power requirement of the driving pump used in the same-well single-pump method is much lower than that of the driving double-pump, so the manufacturing and maintenance costs are also much lower, which is also the main reason for realizing large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the upper structure of the integrated packer water distribution pipe string;

[0026] Figure 2 It is a schematic diagram of the lower structure of the integrated packer water distribution pipe string;

[0027] Figure 3It is a schematic diagram of the injection-production process in the same well;

[0028] In the figure: 1. tubing, 2. water pipe, 3. upper joint, 4. packer, 5. water distributor, 6. cylindrical main body, 7. piston head, 8. valve core, 9. valve sleeve, 10. upper water channel, 11. injection channel, 12. capillary, 13. pressure transmission setting hole, 14. pressure transmission hole, 15. outer diversion hole, 16. inner diversion hole, 17. production pipeline, 18. pressure detection module, 19. production valve, 20. reinjection pipeline, 21. reinjection valve, 22. injection-production pump, 23. water intake valve, 24. oil production valve, 25. oil production pipeline, 26. water intake pipeline, 27. pressure control valve, 28. hydraulic pump, 29. ground controller, 30. pressure boosting pipeline. Specific implementation method

[0029] The following further illustrates the present invention in conjunction with the accompanying drawings and embodiments. Embodiment 1

[0030] As Figure 1 and Figure 2 , the integrated packer and water distribution pipe string includes a tubing 1, a water pipe 2 and a tool pipe arranged from inside to outside. An upper water channel 10 is formed in the annulus between the tubing 1 and the water pipe 2, and an injection channel 11 is formed in the annulus between the water pipe 2 and the tool pipe. A group of capillary tubes 12 arranged in a surrounding manner are provided in the injection channel 11.

[0031] Among them, the tool pipe includes an upper joint 3, a packer 4 and a water distributor 5 connected in sequence from top to bottom. The pressure transmission setting hole 13 of the packer 4 is communicated with the injection channel 11. The water distributor 5 includes a cylindrical main body 6. A valve cavity and an outer diversion hole 15 communicating the valve cavity with the injection channel 11 are formed on the cylindrical wall of the cylindrical main body 6.

[0032] The inner bottom of the valve cavity is connected with a valve sleeve 9. An inner diversion hole 16 communicating with the outer diversion hole 15 is formed on the valve sleeve 9. A valve core 8 cooperating with the inner diversion hole 16 is slidably and sealingly connected in the valve sleeve 9. A piston head 7 slidably and sealingly connected with the valve cavity is provided at the upper end of the valve core 8 after the valve core 8 extends out of the valve sleeve 9.

[0033] A group of liquid inlet channels corresponding to the inlet ends of the capillary tubes 12 one by one are formed on the upper joint 3. The outlet end of one of the capillary tubes 12 is communicated with the top of the valve cavity, and the outlet ends of the remaining capillary tubes 12 are communicated with a group of liquid outlet channels formed on the cylindrical main body 6 one by one.

[0034] Working principle:

[0035] Switch water distributor 5: When closing the water distributor 5, hydraulic pressure is pumped into the capillary 12 connected to the valve cavity. The hydraulic pressure enters the valve cavity through the capillary 12 to drive the piston head 7 to drive the valve core 8 to move downward, thereby blocking the internal diversion hole 16. When opening the water distributor 5, just disconnect the hydraulic pressure pumped into the capillary 12, and the downhole pressure can push the valve core 8 and the piston head 7 upward through the valve sleeve 9, thereby opening the internal diversion hole 16.

[0036] During setting: Hydraulic pressure enters the packer 4 from the water injection channel 11 and the pressure transmission setting hole 13, thereby driving the packer 4 to set. Embodiment 2

[0037] This embodiment is further optimized on the basis of the above embodiment. Specifically:

[0038] Such as Figure 2 , a pressure transmission hole 14 is also opened on the barrel wall of the cylindrical main body 6. The pressure transmission hole 14 connects the annular space between the valve core 8 and the valve cavity with the water injection channel 11;

[0039] In this design, during the water injection operation, the hydraulic pressure in the water injection channel 11 enters the annular space between the valve core 8 and the valve cavity through the pressure transmission hole 14, so as to be able to drive the piston head 7 to drive the valve core 8 to move upward to open the water injection channel 11 of the water distributor 5. Through this design, the stability and smoothness of opening the water distributor 5 are further improved.

[0040] The bottom of the valve core 8 is of a conical structure, and the bottom of the inner cavity of the valve sleeve 9 is provided with a conical surface that cooperates with and limits the bottom of the valve core 8. With this design, when the bottom of the valve core 8 contacts the conical surface, a certain gap is left between the lower end surface of the piston head 7 and the upper end surface of the valve sleeve 9, and the pressure transmission hole 14 is located in the middle of this gap, so as to be able to guide the injected liquid into this gap to drive the piston head 7 to move upward when opening the water distributor 5. Embodiment 3

[0041] Such as Figures 1 to 3 , this embodiment adopts the same-well injection and production process method of the above integrated packer and water distribution pipe string, including the following steps:

[0042] First, connect multiple groups of integrated packer and water distribution pipe strings from top to bottom to form a tool string. The adjacent upper and lower tubing 1s are connected into an oil production pipeline 25, the adjacent upper and lower water pipes 2 are connected into a water intake pipeline 26, and the adjacent upper and lower water injection channels 11 are connected into a reinjection pipeline 20.

[0043] Only one of the group of capillaries 12 in the integrated packer and water distribution pipe string located above is connected to the valve cavity for switching the water distributor 5, and the bottoms of the remaining capillaries 12 are connected to the tops of the capillaries 12 of the integrated packer and water distribution pipe string located below, and are connected downward in this way to form a string of multiple capillaries 12 for driving the switching of different water distributors 5.

[0044] Then, a tool string and an injection-production pump 22 are lowered into the injection-production well. The inlet ends of the injection-production pump 22 are respectively connected to an oil extraction pipeline 25 and a water intake pipeline 26. An oil extraction valve 24 is installed on the oil extraction pipeline 25, and a water intake valve 23 is installed on the water intake pipeline 26.

[0045] The outlet ends of the injection-production pump 22 are respectively connected to a production pipeline 17 pumped out to the ground and an injection pipeline 20 pumped into the well through pipelines. A production valve 19 is installed on the production pipeline 17, and an injection valve 21 is installed on the injection pipeline 20.

[0046] An additional pressure transmission branch extending to the ground is also connected to the injection pipeline 20 and is connected to a pressure detection module 18 through the pressure transmission branch.

[0047] During the setting operation of the packer 4: Open the water intake valve 23 and the injection valve 21, close the oil extraction valve 24 and the production valve 19, pump the well water into the injection pipeline 20 through the water intake pipeline 26, the injection-production pump 22, and the injection pipeline 20. At this time, all the water distributors 5 are in the closed state, and the hydraulic pressure drives each stage of the packer 4 to set through each pressure transmission setting hole 13, forming multiple injection layers arranged vertically, and a water distributor 5 is equipped at each injection layer.

[0048] During the oil production operation: Open the oil extraction valve 24 and the production valve 19, close the water intake valve 23 and the injection valve 21, and pump the oil to the ground through the oil extraction pipeline 25, the injection-production pump 22, and the production pipeline 17.

[0049] During the water injection operation: Open the water intake valve 23 and the injection valve 21, close the oil extraction valve 24 and the production valve 19, pump the well water into the injection layer through the water intake pipeline 26, the injection-production pump 22, and the injection pipeline 20. During the water injection process, the water injection pressure is detected in real time by the pressure detection module 18, and according to the change of the water injection pressure, the switch of a single water distributor 5 is opened to inject water into a single-stage injection layer by injecting pressure into different capillaries 12, or the switches of multiple water distributors 5 are opened to adjust the position and water injection volume of the re-injected water for a multi-stage injection layer.

[0050] As a preferred mode of this embodiment: A ground controller 29 and a hydraulic pump 28 are also adopted.

[0051] An electrical connection is established between the ground controller 29, the hydraulic pump 28, and the pressure detection module 18, and the opening and closing of the oil extraction valve 24, the water intake valve 23, the production valve 19, and the injection valve 21 are controlled through the ground controller 29.

[0052] The hydraulic outlet of the hydraulic pump 28 is respectively connected to the capillaries 12 controlling each water distributor 5 through a pressure boosting pipeline 30 in series, and a pressure control valve 27 is provided on each pressure boosting pipeline 30 entering the water distributor 5. Both the pressure control valve 27 and the hydraulic pump 28 are electrically connected to the ground controller 29.

[0053] Among them, the ground controller 29 can be a PLC controller, an industrial control computer, etc. The ground controller 29 receives the data collected by the pressure detection module 18. The hydraulic outlet of the hydraulic pump 28 and each water distributor 5 are respectively connected through a pressure boosting pipeline 30. By controlling the opening of different pressure control valves 27 through the ground controller 29, the water distributor 5 of different injection layers can be opened to perform the water injection operation on them.

[0054] In addition, chemical treatment can be implemented by pumping chemical agents into a certain injection layer through the pressure transmission branch of the pressure detection module 18. For example, a plugging removal agent can be pumped into the blocked injection layer through the pressure transmission branch for treatment.

[0055] The present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the purpose of the present invention, and the changed content still belongs to the protection scope of the present invention.

Claims

1. Integrated packer and water distribution string, characterized in that: It includes an oil pipe, a water pipe and a tool pipe arranged from the inside to the outside. An annular water inlet channel is formed between the oil pipe and the water pipe, and an annular water injection channel is formed between the water pipe and the tool pipe. A group of capillary tubes arranged in a surrounding manner are provided in the water injection channel. The tool pipe includes an upper joint, a packer and a water distributor connected in sequence from top to bottom. The pressure transmission setting hole of the packer is communicated with the water injection channel. The water distributor includes a cylindrical main body. A valve cavity and an outer diversion hole communicating the valve cavity with the water injection channel are formed on the cylindrical wall of the cylindrical main body. A valve sleeve is connected to the inner bottom of the valve cavity. An inner diversion hole communicating with the outer diversion hole is formed on the valve sleeve. A valve core matched with the inner diversion hole is slidably and sealingly connected in the valve sleeve. After the upper end of the valve core extends out of the valve sleeve, a piston head slidably and sealingly connected with the valve cavity is provided. A group of liquid inlet flow channels respectively corresponding to the inlet ends of the capillary tubes are formed on the upper joint. The outlet end of one of the capillary tubes is communicated with the top of the valve cavity, and the outlet ends of the remaining capillary tubes are respectively communicated with a group of liquid outlet flow channels formed on the cylindrical main body.

2. The integrated packer water distribution pipe string according to claim 1, wherein: A pressure transmission hole is further formed on the cylindrical wall of the cylindrical main body. The pressure transmission hole communicates the annular gap between the valve core and the valve cavity with the water injection channel.

3. The integrated packer water distribution pipe string according to claim 2, characterized in that: The bottom of the valve core is in a conical structure, and a conical surface portion for cooperating with and limiting the bottom of the valve core is provided at the inner bottom of the valve sleeve cavity.

4. A method for co - well injection and production technology, characterized in that: Adopt the integrated packer and water distribution pipe string according to any one of claims 1 to 3. The same-well injection and production process method includes the following steps: First, connect multiple groups of integrated packer and water distribution pipe strings from top to bottom to form a tool pipe string. The adjacent oil pipes above and below are connected into an oil extraction pipeline, the adjacent water pipes above and below are connected into a water extraction pipeline, and the adjacent water injection channels above and below are connected into a reinjection pipeline. Only one of a group of capillary tubes of the integrated packer and water distribution pipe string located above is communicated with the valve cavity to switch the water distributor, and the bottoms of the remaining capillary tubes are connected to the tops of the capillary tubes of the integrated packer and water distribution pipe string located below. Connect downward in this way to form multiple capillary tube strings for driving the switching of different water distributors. Then, lower the tool pipe string and the injection and production pump into the injection and production well. The inlet ends of the injection and production pump are respectively communicated with the oil extraction pipeline and the water extraction pipeline. An oil extraction valve is installed on the oil extraction pipeline, and a water extraction valve is installed on the water extraction pipeline. The outlet ends of the injection and production pump are respectively connected to the production pipeline pumped out of the ground and the reinjection pipeline pumped into the well through pipelines. A production valve is installed on the production pipeline, and a reinjection valve is installed on the reinjection pipeline. A pressure transmission branch extending to the ground is further connected to the reinjection pipeline and is connected to a pressure detection module through the pressure transmission branch. During the packer setting operation: open the water extraction valve and the reinjection valve, close the oil extraction valve and the production valve, pump the well water into the reinjection pipeline through the water extraction pipeline, the injection and production pump and the reinjection pipeline. At this time, all the water distributors are in the closed state, and the hydraulic pressure drives each stage of the packer to set through each pressure transmission setting hole, forming multiple stages of water injection layers arranged vertically, and a water distributor is equipped at each water injection layer. During the oil production operation: open the oil extraction valve and the production valve, close the water extraction valve and the reinjection valve, and pump the oil to the ground through the oil extraction pipeline, the injection and production pump and the production pipeline. During the water injection operation: Open the water intake valve and the reinjection valve, close the oil production valve and the production valve, and pump the water in the well into the water injection layer through the water intake pipeline, the injection-production pump, and the reinjection pipeline. During the water injection process, the water injection pressure is detected in real time by the pressure detection module, and according to the change of the water injection pressure, the single water distributor switch is opened by injecting pressure into different capillaries to inject water into the single-stage water injection layer, or multiple water distributor switches are opened to adjust the position and injection volume of the reinjected water in the multi-stage water injection layer.

5. A co-well injection and production process method according to claim 4, characterized in that: A surface controller and a hydraulic pump are also adopted in the same well injection-production process method. An electrical connection is established between the surface controller, the hydraulic pump, and the pressure detection module, and the opening and closing of the oil production valve, the water intake valve, the production valve, and the reinjection valve are controlled by the surface controller. The hydraulic outlet of the hydraulic pump is respectively connected to the capillary string controlling each water distributor through a pressure injection pipeline, and a pressure control valve is provided on each pressure injection pipeline entering the water distributor. Both the pressure control valve and the hydraulic pump are electrically connected to the surface controller.

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