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CN-121993129-A - Water distributor, layered water injection pipe column and water injection method

CN121993129ACN 121993129 ACN121993129 ACN 121993129ACN-121993129-A

Abstract

The invention belongs to the technical field of oilfield water injection development, and particularly relates to a water distributor, a layered water injection pipe column and a water injection method, wherein the water distributor comprises a water distributor body, the upper end of the water distributor body is provided with a water distribution cavity, the water distribution cavity is connected with a plurality of water inlet holes, the water distributor body is provided with a plurality of water injection channels, water inlets of the water injection channels are communicated with the water distribution cavity, water outlets of the water injection channels are respectively located at different heights of the water distributor body, and a flow control structure and a flow measurement structure are arranged in the water injection channels. The water distributor does not need to be provided with a pipeline for connecting with a water injection channel, and has the advantages of simple structure, high safety and low cost.

Inventors

  • FU QIANG
  • LI XU
  • HU ZHIDONG
  • WANG WEILIN
  • GUO BINJIAN
  • DONG PENGYI
  • KUANG XUGUANG
  • LIU YU
  • YANG JINKUN
  • LIU PENG
  • XU CHANGLIANG

Assignees

  • 中国石油天然气股份有限公司

Dates

Publication Date
20260508
Application Date
20241101

Claims (20)

  1. 1. The utility model provides a water distributor, its characterized in that, includes water distributor body (10), the upper end of water distributor body (10) is provided with water distribution chamber (20), water distribution chamber (20) are connected with a plurality of inlet opening (30), water distributor body (10) are provided with a plurality of water injection passageway (11), a plurality of the water inlet of water injection passageway (11) all with water distribution chamber (20) intercommunication, the delivery port of water injection passageway (11) is located respectively the different height of water distributor body (10), be provided with flow control structure (40) and flow measurement structure (50) in water injection passageway (11).
  2. 2. A water dispenser according to claim 1, wherein the outer surface of the water distribution chamber (20) is provided with a conical shape.
  3. 3. A water dispenser according to claim 1 or 2, wherein the water distribution chamber (20) is formed by enclosing the water dispenser body (10) and a conical housing (60) connected to the upper part of the water dispenser body (10), and the water inlet (30) is arranged on the conical housing (60).
  4. 4. A water dispenser according to claim 3, wherein a plurality of water inlets are provided, and a plurality of water inlet openings (30) are uniformly provided in the conical housing (60).
  5. 5. A water dispenser according to claim 3, wherein the conical housing (60) is provided at its upper end with a fishing head.
  6. 6. The water dispenser of claim 1, further comprising a controller (70) and a battery pack (80), wherein the controller (70) is configured to receive flow information measured by the flow measurement structure (50) and to control the flow control structure (40) based on the flow information, and wherein the battery pack (80) is configured to power the controller (70), the flow measurement structure (50) and the flow control structure (40).
  7. 7. A water dispenser according to claim 6, wherein the controller (70) and the battery (80) are disposed within the water dispensing chamber (20), and wherein the controller (70) and the battery (80) are water-repellent.
  8. 8. A water dispenser according to claim 7, wherein the controller (70) and the battery (80) are arranged at the top of the conical housing (60).
  9. 9. A water dispenser according to claim 1, characterized in that the water injection channel (11) comprises a first water injection channel (111), a second water injection channel (112) and a third water injection channel (113), wherein the first water inlet of the first water injection channel (111), the second water inlet of the second water injection channel (112) and the third water inlet of the third water injection channel (113) are all in communication with the water distribution chamber (20), the first water outlet of the first water injection channel (111) is located in the upper part of the water dispenser body (10), the second water outlet of the second water injection channel (112) is located in the middle part of the water dispenser body (10), and the third water outlet of the third water injection channel (113) is located in the lower part of the water dispenser body (10).
  10. 10. A water dispenser according to claim 9, wherein the first and second water outlets are located on the side of the dispenser body (10) and the third water outlet is located on the bottom surface of the dispenser (1).
  11. 11. A water dispenser according to claim 9 or 10, characterized in that a first sealing ring (12) is arranged above and below a first water outlet of the water dispenser body (10), a second sealing ring (13) is arranged above and below a second water outlet of the water dispenser body (10), and the second sealing ring (13) is arranged below the first sealing ring (12).
  12. 12. A water dispenser according to claim 9 or 10, characterized in that the outer surface of the water dispenser body (10) is provided with a first annular groove (14) and a second annular groove (15), the first annular groove (14) being connected to the first water outlet and the second annular groove (15) being connected to the second water outlet.
  13. 13. A water dispenser according to claim 1, wherein the flow control structure (40) is a solenoid valve.
  14. 14. A water dispenser according to claim 1, wherein the flow measuring structure (50) is a flow meter.
  15. 15. A layered water injection string, characterized by comprising a water distributor and an oil pipe (90) according to any one of claims 1-14, wherein the water distributor (1) is arranged in the oil pipe (90), and a water injection hole is arranged in the oil pipe (90) corresponding to a water outlet of the water distributor (1).
  16. 16. A separate layer water injection string according to claim 15, characterized in that the inner wall of the oil pipe (90) is provided with a limit structure for limiting the water distributor (1).
  17. 17. The separate-layer water injection string according to claim 15, wherein the lower end of the oil pipe (90) is provided with a ball seat (100) in the oil pipe (90), the end of the lower end of the oil pipe (90) is connected with a screen pipe (110), and the lower end of the screen pipe (110) is connected with a plug (120).
  18. 18. A layered water injection string according to claim 17, wherein the screen (110) is integrally formed with the tubing (90).
  19. 19. A water injection method of a split-level water injection string, comprising a split-level water injection string as claimed in any one of claims 15 to 16, the water injection method comprising the steps of: setting a packer (130) outside the separate-layer water injection string; lowering a separated layer water injection pipe column provided with a packer (130) into a well, and realizing setting through the packer (130); And water is injected in a layered way through a water distributor (1).
  20. 20. A water injection method of a layered water injection string, comprising a layered water injection string according to claims 17-18, wherein the water injection hole corresponding to a water injection channel (11) in the water injection channel (11) is a hole on the screen (110), the water injection method comprising the steps of: setting a packer (130) outside the separate-layer water injection string; Lowering a separate-layer water injection string provided with a packer (130) into a well, and pressurizing an oil pipe (90) through a surface pump to enable the packer (130) to realize setting; After the packer (130) is set, the surface pump continues to pressurize and drive off the ball seat (100); And water is injected in a layered way through a water distributor (1).

Description

Water distributor, layered water injection pipe column and water injection method Technical Field The invention belongs to the technical field of oilfield water injection development, and particularly relates to a water distributor, a separate-layer water injection pipe column and a water injection method. Background In order to compensate the formation pressure drop and energy loss caused by oil field exploitation, water (gas) injection and other methods are needed to supplement underground energy, so as to achieve energy balance and maintain formation pressure. In order to ensure that each production layer can keep a good pressure level, different water quantities are respectively injected into each small layer with different permeability and pressure so as to achieve balanced oil displacement efficiency and production degree. The most widely applied of heterogeneous multi-reservoir mining is a separate layer water injection technology, and various water injection technology and special matched tools are formed. CN104389563B discloses a two-layer separate injection process pipe column device for a nonmetallic coiled tubing, which comprises a nonmetallic coiled tubing and an injection quantity adjusting device, wherein a first water injection channel and a second water injection channel which are symmetrical with respect to the center of the nonmetallic coiled tubing are arranged in the nonmetallic coiled tubing, and the initial ends of the first water injection channel and the second water injection channel are respectively provided with the injection quantity adjusting device and are connected with the injection quantity adjusting device through a conversion joint. The non-metal continuous oil pipe two-layer separate injection process pipe column device replaces the original separate injection process by using a water distributor, and has better anti-corrosion and anti-scale effects. However, the pipe column device still has the following defects: (1) The first water injection channel and the second water injection channel are required to be connected from the wellhead to the underground, so that the structure is complex, the wellhead is provided with a plurality of and disordered structures, and the safety is reduced; (2) The first water injection channel and the second water injection channel are to be connected to the wellhead, which greatly increases the cost. In view of this, the present invention has been made. Disclosure of Invention In order to solve the technical problems in the prior art, the invention provides the water distributor, the layered water injection pipe column and the water injection method, and the water distributor does not need to be provided with a pipeline connected with a water injection channel and has the advantages of simple structure, high safety and low cost. The invention comprises the following technical scheme: The invention provides a water distributor, which comprises a water distributor body, wherein the upper end of the water distributor body is provided with a water distribution cavity, the water distribution cavity is connected with a plurality of water inlet holes, the water distributor body is provided with a plurality of water injection channels, water inlets of the water injection channels are communicated with the water distribution cavity, water outlets of the water injection channels are respectively positioned at different heights of the water distributor body, and a flow control structure and a flow measurement structure are arranged in the water injection channels. Further, the outer surface of the water distribution cavity is arranged to be conical. Further, the water distribution cavity is formed by enclosing the water distributor body and a conical shell connected to the upper portion of the water distributor body, and the water inlet is formed in the conical shell. Further, the water inlets are arranged in a plurality, and the water inlets are uniformly arranged on the conical shell. Further, the upper end of the conical shell is provided with a fishing head. Further, the intelligent flow control device comprises a controller and a battery pack, wherein the controller is used for receiving flow information measured by the flow measurement structure and controlling the flow control structure according to the flow information, and the battery pack is used for supplying power to the controller, the flow measurement structure and the flow control structure. Further, the controller and the battery pack are arranged in the water distribution cavity, and the outer surfaces of the controller and the battery pack are subjected to waterproof treatment. Further, the controller and battery pack are disposed at the top of the conical housing. Further, the water injection channel comprises a first water injection channel, a second water injection channel and a third water injection channel, wherein a first water inlet of the first water injection channel, a seco