Single-channel intelligent control water distribution system and method for offshore platform injection well

Abstract

The application discloses a single-channel intelligent control water distribution system and method for offshore platform injection wells, which comprises a single-channel intelligent water distribution control center, a downhole control cable, a tubing, a packer, a clamping cable joint, a single-channel cable intelligent measurement and adjustment water distributor, a ground control cable, an intelligent measurement and adjustment valve, an injection main pipe and an injection pump, etc. The single-channel intelligent water distribution control center is connected with injection wells of the whole platform through the downhole control cable to realize data transmission and control between the downhole and the platform. The single-channel intelligent water distribution control center is connected with the intelligent measurement and adjustment valve and the injection pump of the whole platform through the ground control cable to realize data transmission and control between the intelligent measurement and adjustment valve, the injection pump and the single-channel intelligent water distribution control center. The application can realize the functions of collaborative control of injection wells and injection pipelines of the whole platform under the demand of large-scale testing of offshore platforms, remote control and the like, changes the previous single-well injection distribution into whole-platform injection distribution, and is suitable for layered injection testing and distribution of offshore oilfield large-scale testing.

Description

Technical Field

[0001] This invention belongs to the field of oil reservoir development technology, and in particular relates to a single-channel intelligent control water distribution system and method for water injection wells on offshore platforms. Background Technology

[0002] Water injection is a crucial technique in reservoir development, ensuring long-term high and stable oil production. Early water injection primarily employed a general water injection process; however, prolonged general water injection can lead to increasing porosity differences between oil layers. To mitigate these porosity discrepancies, oilfields typically replace the general water injection process with a stratified water injection approach.

[0003] Layered water injection technology refers to the process of installing packers in injection wells to separate oil layers with significant differences, and then using a single-channel cable-operated intelligent water distribution device to perform layered water injection. This method controls the water injection volume of large-pore layers and enhances the water injection volume of medium and small-pore layers, enabling all types of oil layers to play their roles.

[0004] Currently, the single-channel cable-operated intelligent water distribution devices commonly used in the oil and gas industry are mainly divided into several types, including traditional drop-and-retrieve type single-channel cable-operated intelligent water distribution devices, simultaneous measurement and adjustment single-channel cable-operated intelligent water distribution devices, and small-displacement automatic measurement and adjustment single-channel cable-operated intelligent water distribution devices. None of these single-channel cable-operated intelligent water distribution devices can achieve 10m accuracy while ensuring testing precision. 3 / d~1000m 3 / d Traffic control within a large test range.

[0005] Meanwhile, the existing layered water injection system cannot achieve remote control, self-inspection and self-control functions, and cannot coordinate the control of water injection wells and water injection pipelines across the entire platform, nor can it automatically allocate the water injection volume of each well and layer across the entire platform. It cannot meet the needs of efficient measurement and adjustment in offshore oil fields and needs further optimization and upgrading. Summary of the Invention

[0006] The problem this invention aims to solve is to provide a single-channel intelligent control water distribution system and method for water injection wells on offshore platforms. This method enables collaborative control of water injection wells and pipelines across the entire platform, as well as remote control, under the large-scale testing requirements of offshore platforms. It transforms the previous single-well injection distribution into full-platform injection distribution, and is suitable for layered water injection testing and distribution within a large testing range in offshore oilfields.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a single-channel intelligent control water distribution system for injection wells on offshore platforms, comprising a single-channel intelligent water distribution control center, downhole control cables, tubing, packers, cable connectors, a single-channel cable-mounted intelligent measuring and adjusting water distributor, a surface control cable, intelligent measuring and adjusting valves, a main water injection pipe, and a water injection pump. The single-channel intelligent water distribution control center is connected to all injection wells on the platform via the downhole control cables, realizing data transmission and control between the downhole and the platform. Two cable connectors are symmetrically embedded at the upper and lower ends of the packer to facilitate the passage of the downhole control cables. The single-channel intelligent water distribution control center is connected to the intelligent measuring and adjusting valves and the water injection pumps on the platform via the surface control cables, realizing data transmission and control between the intelligent measuring and adjusting valves, the water injection pumps, and the single-channel intelligent water distribution control center.

[0008] Furthermore, the clip-on cable connector comprises a lower clip-on connector, an upper clip-on connector, a clamping device, and a locking block. The lower clip-on connector, from bottom to top, has a signal connection hole, an O-ring sealing groove, a first push-type sealing groove, a locking groove, a second push-type sealing groove, a rectangular groove, and an external thread. There are two O-ring sealing grooves; the O-ring inside each groove cooperates with the sealing rings in the first and second push-type sealing grooves to form a quadruple seal. The locking groove has three layers; each layer is an upwardly inclined rectangular annular groove, and four circumferentially distributed rectangular grooves extend vertically through the groove. The upper clip-on connector is welded to the cut downhole control cable. The upper clip-on connector structure, from bottom to top, consists of a signal connection plug, an O-ring sealing block, a push-type sealing... The device comprises a face, a locking block, a push-type sealing block, and a cable. The signal connection plug mates with the signal connection hole to achieve downhole signal transmission. The locking block consists of three layers arranged in four columns. Each locking block is an upwardly inclined rectangular block. The locking block mates with the locking groove to ensure that the upper and lower locking connectors are axially fixed and can withstand axial loads. The clamping device has an internal thread that mates with the external thread. The clamping device presses the upper locking connector into the lower locking connector to ensure successful sealing of the sealing rings in the first and second push-type sealing grooves. There are four locking blocks that are embedded in the rectangular grooves within the lower locking connector to restrict the circumferential movement of the assembled upper locking connector within the lower locking connector.

[0009] Furthermore, the single-channel cable-operated intelligent water distribution device comprises a cable protector, cable connector, upper connector, pull ring, retaining ring, fixing ring, sealing connector, protective module sheath, circuit module sheath, main channel pipe, lower connector, motor assembly, water tap assembly, internal pressure measurement module, temperature measurement module, external pressure measurement module, flow test module, and outer sheath. The cable protector has a through-hole on its side to protect the cable connector. The cable protector is threaded to the upper connector. The lower outer side of the upper connector has a retaining ring groove, in which the retaining ring and fixing ring are fitted. The pull ring has threads on its outside. The upper and lower parts of the pull ring are respectively... Due to the axial limitation of the upper connector shaft step and the retaining ring, it is fitted onto the upper connector during assembly and used in conjunction with the retaining ring and the fixing ring. While ensuring that the upper connector does not rotate during the assembly of the outer protective tube, the upper connector and the outer protective tube are assembled and fixedly connected. The sealing joint is fitted onto the outside of the main channel pipe. The lower side of the sealing joint is fixedly connected to the protection module protective tube, the circuit module protective tube, and the motor assembly. The protection module protective tube contains the power-off module of the single-channel cable-stayed intelligent water distribution device. The circuit module protective tube contains the core control circuit board of the single-channel cable-stayed intelligent water distribution device and is used to protect the core control circuit board.

[0010] Furthermore, the motor assembly comprises an upper protective tube, a motor, a coupling, limit rings, springs, an upper lead screw, an upper nut, bearings, a middle protective tube, a lower protective tube, a lower lead screw, a lower nut, and a power-off trigger point. Two limit rings are fitted inside the middle of the upper protective tube; each limit ring is fixedly connected to one of the springs. A travel groove is provided inside the middle of the upper protective tube, with two power-off trigger points installed at its upper and lower ends. A travel protrusion is provided on the outside of the upper nut. The upper nut, the upper lead screw, the travel groove, and the travel protrusion work together to convert the rotational motion of the motor into the linear motion of the upper lead screw. The springs, the power-off trigger points, and the travel protrusion work together to limit the water nozzle travel. The springs buffer excessive rotational motion of the motor, preventing damage to the motor assembly components due to excessive motor rotation.

[0011] Furthermore, the single-channel intelligent water distribution control center includes an underground single-channel intelligent water distribution control center, a surface single-channel intelligent water distribution control center, and an auxiliary single-channel intelligent water distribution control center. The underground single-channel intelligent water distribution control center consists of a CPU processing center, a water absorption capacity calculation module, a signal receiving / transmitting module, a water injection volume self-checking and self-control module, and a remote communication control module. The surface single-channel intelligent water distribution control center consists of a CPU processing center, a flow rate self-checking and self-control module, a signal receiving / transmitting module, and a remote communication control module. The auxiliary single-channel intelligent water distribution control center consists of a storage module, a display module, and a power supply module.

[0012] Furthermore, the present invention also provides a single-channel intelligent control water distribution method for offshore platform water injection wells, utilizing the aforementioned single-channel intelligent control water distribution system for offshore platform water injection wells, comprising the following steps:

[0013] S1: Equipped with a single-channel cable-operated intelligent water distribution device and tubing at the deepest layer of a single injection well;

[0014] S2: Cut a downhole control cable according to the current formation depth. Connect one end of the downhole control cable to the upper end of the single-channel wired intelligent measuring and adjusting water distribution device, and weld the other end of the downhole control cable to the card-type upper connector.

[0015] S3: Embed the two cassette lower connectors into the upper and lower end faces of the packer in a mirror image, ensuring that the external threads of the cassette lower connectors are always exposed.

[0016] S4: Insert the welded upper clip into the lower clip of the packer along the rectangular groove. After it is in place, rotate it clockwise and insert four locking blocks into the slot. Finally, assemble the clamp and ensure that the clamp is rotated into place.

[0017] S5: Repeat S1 to S4, assembling the sub-deep single-channel cable-operated intelligent water distribution device, tubing, cassette cable connector, packer, and downhole control cable;

[0018] S6: Repeat S1 to S5 to complete the installation of downhole single-channel cable-operated intelligent water distribution device, tubing, card-type cable connector, packer and downhole control cable for all water injection wells;

[0019] S7: Connect the assembled downhole control cable to the single-channel intelligent water distribution control center;

[0020] S8: Install an intelligent monitoring and adjustment valve at the wellhead tubing and connect the tubing to the main water injection pipe;

[0021] S9: Connect the intelligent control valves and water pumps of the entire platform to the single-channel intelligent water distribution control center using ground control cables;

[0022] S10: Activate the single-channel intelligent water distribution control center and input parameters such as the required injection volume for each layer of each injection well into the single-channel intelligent water distribution control center;

[0023] S11: Turn on the intelligent control valve, water pump and single-channel cable intelligent control water distributor to start water injection;

[0024] S12: In the single-channel intelligent water distribution control center, activate the flow self-checking and self-control function of the single-channel cable intelligent measuring and adjusting water distributor and intelligent measuring and adjusting valve to automatically match the water injection volume of each layer, each well and each water injection pipeline.

[0025] S13: Enable the remote control function of the single-channel intelligent water distribution control center to provide complete and real-time platform water injection well information for onshore oil reservoir staff.

[0026] The advantages and positive effects of this invention are:

[0027] This invention is based on a single-channel cable-connected intelligent water distribution device with complete testing functions. It realizes the coordinated control of all water injection wells, water injection pipelines and water injection pumps on the offshore platform, and automatically allocates the water injection volume of each water injection well and each layer. It effectively solves the problems of coordinated control of water injection wells and water injection pipelines and remote control of the entire platform under the large-scale testing needs of the offshore platform, and transforms the previous single-well injection into full-platform injection. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the system structure according to an embodiment of the present invention.

[0029] Figure 2 This is a cross-sectional view of a card-type cable connector according to an embodiment of the present invention.

[0030] Figure 3 This is a schematic diagram of the card-type lower connector structure according to an embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of the card-type upper connector structure according to an embodiment of the present invention.

[0032] Figure 5 This is a schematic diagram of the clamping device structure according to an embodiment of the present invention.

[0033] Figure 6 This is a block diagram of a single-channel intelligent water distribution control center system according to an embodiment of the present invention.

[0034] Figure 7 This is a schematic diagram of the forward structure of a single-channel cable-connected intelligent water distribution device according to an embodiment of the present invention.

[0035] Figure 8 This is a schematic diagram of the rear structure of a single-channel cable-connected intelligent water distribution device according to an embodiment of the present invention.

[0036] Figure 9 This is a right-side structural schematic diagram of a single-channel cable-connected intelligent water distribution device according to an embodiment of the present invention.

[0037] Figure 10 This is a cross-sectional view of the motor assembly in a single-channel cable-connected intelligent water distribution device according to an embodiment of the present invention.

[0038] Figure 11 This is a process flow diagram of another embodiment of the present invention.

[0039] In the picture:

[0040] 1. Single-channel intelligent water distribution control center;

[0041] 2. Downhole control cables;

[0042] 3. Oil pipe;

[0043] 4. Packer;

[0044] 5. Clip-on cable connector; 5-1. Clip-on lower connector; 5-1-1. Signal connection hole; 5-1-2. O-ring sealing groove; 5-1-3. First push-type sealing groove; 5-1-4. Clip groove; 5-1-5. Second push-type sealing groove; 5-1-6. Rectangular groove; 5-1-7. External thread; 5-2. Clip-on upper connector; 5-2-1. Signal connection plug; 5-2-2. O-ring sealing block; 5-2-3. Push-type sealing surface; 5-2-4. Clip block; 5-2-5. Push-type sealing block; 5-2-6. Cable; 5-3. Clamping device; 5-3-1. Internal thread; 5-4. Positioning block;

[0045] 6. Single-channel cable-operated intelligent water distribution device; 6-1. Cable protector; 6-2. Cable connector; 6-3. Upper connector; 6-3-1. Snap ring groove; 6-4. Pull ring; 6-5. Snap ring; 6-6. Fixing ring; 6-7. Sealing connector; 6-8. Protection module protective tube; 6-9. Circuit module protective tube; 6-10. Main channel tube; 6-11. Lower connector; 6-12. Motor assembly; 6-12-1. Upper protective tube of motor assembly; 6-12-1-1. Stroke groove; 6-12-2. Motor; 6-12-3. Coupling; 6-12-4. Limit switch Ring; 6-12-5, Spring; 6-12-6, Upper Lead Screw; 6-12-7, Upper Nut; 6-12-7-1, Stroke Protrusion; 6-12-8, Bearing; 6-12-9, Middle Protective Tube of Motor Assembly; 6-12-10, Lower Protective Tube of Motor Assembly; 6-12-11, Lower Lead Screw; 6-12-12, Lower Nut; 6-12-13, Power-Off Trigger Point; 6-13, Water Tap Assembly; 6-14, Internal Pressure Measurement Module; 6-15, Temperature Measurement Module; 6-16, External Pressure Measurement Module; 6-17, Flow Rate Test Module; 6-18, Outer Protective Tube;

[0046] 7. Ground control cable;

[0047] 8. Intelligent control valve;

[0048] 9. Main water injection pipe;

[0049] 10. Water injection pump. Detailed Implementation

[0050] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0052] like Figure 1 As shown, a single-channel intelligent control water distribution system for injection wells on an offshore platform includes a single-channel intelligent water distribution control center 1, downhole control cables 2, tubing 3, packers 4, cable connectors 5, a single-channel cabled intelligent measuring and adjusting water distributor 6, a surface control cable 7, intelligent measuring and adjusting valves 8, a main injection pipe 9, and an injection pump 10. The single-channel intelligent water distribution control center 1 is connected to all injection wells on the platform via the downhole control cable 2, enabling data transmission and control between the downhole and platform. Two cable connectors 5 are symmetrically embedded at the top and bottom of the packer 4, facilitating the passage of the downhole control cable 2. The single-channel intelligent water distribution control center 1 is connected to the intelligent measuring and adjusting valves 8 and the injection pumps 10 on the platform via the surface control cable 7, enabling data transmission and control between the intelligent measuring and adjusting valves 8, the injection pumps 10, and the single-channel intelligent water distribution control center 1.

[0053] Specifically, there are multiple water injection wells, and multiple sets of surface control cables 7 and downhole control cables 2 are provided. The multiple sets of downhole control cables 2 are placed in multiple water injection wells. The multiple sets of downhole control cables 2 are connected in parallel to the single-channel intelligent water distribution control center 1. The multiple sets of surface control cables 7 are connected to the intelligent measuring and adjusting valves 8 on multiple water injection wells. The multiple sets of surface control cables 7 are connected in series to the single-channel intelligent water distribution control center 1.

[0054] This embodiment is based on a single-channel cable-connected intelligent water distribution device 6 with complete testing functions. It realizes the coordinated control of all water injection wells, water injection pipelines and water injection pumps 10 on the offshore platform, and automatically allocates the water injection volume of each water injection well and each layer. It effectively solves the problems of coordinated control of water injection wells and water injection pipelines and remote control of the entire platform under the large-scale testing needs of the offshore platform, and transforms the previous single-well injection into full-platform injection.

[0055] Specifically, such as Figure 2-5As shown, the cable clip connector 5 includes a lower clip connector 5-1, an upper clip connector 5-2, a clamping device 5-3, and a locking block 5-4. Specifically, as... Figure 3 As shown, the card-type lower connector 5-1 is a cylinder. The inside of the card-type lower connector 5-1 is provided with signal connection hole 5-1-1, O-ring sealing groove 5-1-2, first push-type sealing groove 5-1-3 and card groove 5-1-4 from bottom to top. The signal connection hole 5-1-1 is cylindrical, and the O-ring sealing groove 5-1-2 is annular. The O-ring sealing groove 5-1-2 is arranged in two parallel layers. The O-ring sealing block 5-2-2 inside it cooperates with the sealing ring in the first push-type sealing groove 5-1-3 and the second push-type sealing groove 5-1-5 to form a quadruple seal, which can greatly improve the sealing ability of the card-type cable connector 5 and ensure that the card-type cable connector 5 can work normally for a long time in the high temperature and high pressure underground environment. The push-type sealing groove is truncated cone-shaped, and the card groove 5-1-4 is annular. The edge of the card groove 5-1-4 is connected to the rectangular groove 5-1-6. There are four rectangular grooves 5-1-6. The four rectangular grooves 5-1-6 are distributed in a "+" shape with the center of the card groove 5-1-4 as the center. The card groove 5-1-4 is arranged in three parallel layers. The shape of a single layer of card groove 5-1-4 is an upwardly inclined rectangular annular groove. The top surface of the card-type lower connector 5-1 is provided with a second push-type sealing groove 5-1-5, which is conical. The outer cylindrical surface of the top of the card-type lower connector 5-1 is provided with an external thread 5-1-7, which mates with the internal thread 5-3-1 on the inner cylindrical surface of the clamp 5-3. This allows the card-type upper connector 5-2 to be pressed into the inside of the card-type lower connector 5-1, ensuring that the sealing rings in the first push-type sealing groove 5-1-3 and the second push-type sealing groove 5-1-5 can be successfully sealed.

[0056] The card-type upper connector 5-2 is welded and fixed to the cut downhole control cable 2 as a whole. Specifically, as follows: Figure 4 As shown, the card-type upper connector 5-2, from bottom to top, includes a signal connection plug 5-2-1, an O-ring sealing block 5-2-2, a push-type sealing surface 5-2-3, a locking block 5-2-4, a push-type sealing block 5-2-5, and a cable 5-2-6. The signal connection plug 5-2-1 mates with the signal connection hole 5-1-1 to achieve downhole signal transmission. The locking block 5-2-4 consists of three layers, with four rows in each layer. Each locking block 5-2-4 is an upwardly inclined rectangular block that embeds into a rectangular groove 5-1-6. This ensures the axial connection between the card-type upper connector 5-2 and the card-type lower connector 5-1 and allows it to withstand a certain axial load. The upwardly inclined rectangular groove and rectangular block ensure that the rectangular block does not scratch within the rectangular groove, greatly improving the tensile strength of the card-type cable connector 5.

[0057] The locking block 5-4 is embedded in the rectangular groove 5-1-6 within the lower clip-type connector 5-1, restricting the circumferential movement of the assembled upper clip-type connector 5-2 within the lower clip-type connector 5-1. The locking block 5-2-4 mates with the locking groove 5-1-4 to ensure an axially fixed connection between the upper clip-type connector 5-2 and the lower clip-type connector 5-1, and to withstand axial loads. The top of the upper clip-type connector 5-2 is welded to the cut-off downhole control cable 2 for integral bonding.

[0058] Preferred, such as Figure 6 As shown, the single-channel intelligent water distribution control center 1 includes an underground single-channel intelligent water distribution control center, a surface single-channel intelligent water distribution control center, and an auxiliary single-channel intelligent water distribution control center. The underground single-channel intelligent water distribution control center consists of a CPU processing center, a water absorption capacity calculation module, a signal receiving / transmitting module, a water injection volume self-checking and self-control module, and a remote communication control module. The surface single-channel intelligent water distribution control center consists of a CPU processing center, a flow rate self-checking and self-control module, a signal receiving / transmitting module, and a remote communication control module. The auxiliary single-channel intelligent water distribution control center consists of a storage module, a display module, and a power supply module.

[0059] The function of the water absorption capacity calculation module is that the single-channel intelligent water distribution control center 1 can automatically switch the water injection volume and nozzle pressure of the target layer according to the operation command, record the water injection volume and nozzle pressure of the target layer, and automatically calculate the water absorption capacity value of the target layer based on the recorded data.

[0060] The function of the water injection volume self-check and self-control module is that the single-channel intelligent water distribution control center 1 can automatically and periodically calculate the difference between the total water injection volume of each layer of a single well and the water injection volume of the intelligent measuring and adjusting valve 8 at the wellhead according to the operation command. When the difference is higher than the preset value, the accuracy of the flow test module in the single-channel cable intelligent measuring and adjusting water distributor 6 of each layer will be corrected layer by layer. The correction method is to close the water nozzles of the other layers except the target layer to ensure that the water injection volume of the intelligent measuring and adjusting valve 8 is consistent with that of the target layer. The accuracy of the flow test module in the single-channel cable intelligent measuring and adjusting water distributor 6 is corrected based on the test data of the intelligent measuring and adjusting valve 8.

[0061] The function of the flow self-check and self-control module is that the intelligent measuring and regulating valve 8 can automatically and periodically calculate the difference between the total water injection volume of each intelligent measuring and regulating valve 8 under a single water injection pump 10 pipeline and the water supply volume of the water injection pump 10 according to the operation command. When the difference is higher than the preset value, the flow test accuracy of each intelligent measuring and regulating valve 8 will be corrected one by one. The correction method is to close all water injection valves except the target intelligent measuring and regulating valve 8 to ensure that the water injection volume of the intelligent measuring and regulating valve 8 is consistent with that of the water injection pump 10. The flow test accuracy in the intelligent measuring and regulating valve 8 is corrected based on the water injection volume of the water injection pump 10.

[0062] like Figure 7-9As shown, the single-channel cable-operated intelligent water distribution device 6 includes a cable protector 6-1, a cable connector 6-2, an upper connector 6-3, a pull ring 6-4, a retaining ring 6-5, a fixing ring 6-6, a sealing connector 6-7, a protection module sheath 6-8, a circuit module sheath 6-9, a main flow channel pipe 6-10, a lower connector 6-11, a motor assembly 6-12, a water tap assembly 6-13, an internal pressure measurement module 6-14, a temperature measurement module 6-15, an external pressure measurement module 6-16, a flow rate testing module 6-17, and an outer sheath 6-18. The cable protector 6-1 has a through-hole on its upper side to protect the cable connector 6-2. The bottom of the cable protector 6-1 is connected to the upper connector 6-3 via a thread. The lower outer side of the upper connector 6-3 is provided with a retaining ring groove 6-3-1. The retaining ring 6-5 and the fixing ring 6-6 are fitted inside the retaining ring groove 6-3-1. The pull ring 6-4 is threaded on the outside. Its upper and lower parts are respectively limited by the axial step of the upper connector 6-3 and the retaining ring 6-5. During assembly, it is fitted onto the upper connector 6-3 and used in conjunction with the retaining ring 6-5 and the fixing ring 6-6. It can be assembled and fixedly connected to the outer sheath 6-18 without rotating the upper connector 6-3 when assembling the outer sheath 6-18. The bottom of the fixing ring 6-6 is equipped with a main channel pipe 6-10. A sealing joint 6-7 is fitted onto the outer cylindrical surface of the main channel pipe 6-10. The lower side of the sealing joint 6-7 is connected to the protection module protective tube 6-8, the circuit module protective tube 6-9, and the motor assembly 6-12, respectively. The protection module protective tube 6-8 contains the power-off module for the single-channel cable-connected intelligent water distributor 6. When a short-circuit fault occurs in the single-channel cable-connected intelligent water distributor 6 on a single floor, the power-off module will automatically cut off the power supply to the current floor, ensuring that the single-channel cable-connected intelligent water distributors 6 on other floors can operate normally. The circuit module protective tube 6-9 contains the core control circuit board of the single-channel cable-connected intelligent water distributor 6, used to protect the core control circuit board.

[0063] like Figure 10As shown, the motor assembly 6-12 includes an upper protective tube 6-12-1, a motor 6-12-2, a coupling 6-12-3, a limit ring 6-12-4, a spring 6-12-5, an upper lead screw 6-12-6, an upper nut 6-12-7, a bearing 6-12-8, a middle protective tube 6-12-9, a lower protective tube 6-12-10, a lower lead screw 6-12-11, a lower nut 6-12-12, and a power-off trigger point 6-12-13. The motor 6-12-2 has an upper protective tube 6-12-1 for the motor assembly. Two limiting rings 6-12-4 are fitted inside the middle of the upper protective tube 6-12-1, and each limiting ring 6-12-4 is fixedly connected to two springs 6-12-5. A travel groove 6-12-1-1 is provided inside the middle of the upper protective tube 6-12-1. Two power-off trigger points 6-12-13 are installed at the upper and lower ends of the travel groove 6-12-1-1. An upper nut 6-12-7 is located between the two springs 6-12-5, and a travel protrusion 6-12-7-1 is provided on the outside of the upper nut 6-12-7. The upper nut 6-12-7, the upper lead screw 6-12-6, the travel groove 6-12-1-1, and the travel protrusion 6-12-7-1 work together to convert the rotational motion of the motor 6-12-2 into the linear motion of the upper lead screw 6-12-6. The spring 6-12-5, the power-off trigger point 6-12-13, and the travel bump 6-12-7-1 work together to limit the travel of the water nozzle. The spring 6-12-5 can buffer the excessive rotation of the motor 6-12-2 to prevent the motor 6-12-2 from being damaged due to excessive rotation.

[0064] like Figure 11 The present invention also provides a single-channel intelligent control water distribution method for offshore platform water injection wells, which utilizes the aforementioned single-channel intelligent control water distribution system for offshore platform water injection wells and includes the following steps:

[0065] S1: Equipped with a single-channel cable-operated intelligent water distribution device 6 and tubing 3 at the deepest level in a single injection well.

[0066] S2: Cut a section of downhole control cable 2 according to the current formation depth. One end of downhole control cable 2 is connected to the upper end of single-channel wired intelligent water distribution device 6, and the other end of downhole control cable 2 is welded and fixed to card-type upper connector 5-2.

[0067] S3: Embed the two card-type lower connectors 5-1 into the upper and lower end faces of the packer 4 in a mirror image, ensuring that the external threads of the card-type lower connectors 5-1 are always exposed.

[0068] S4: Insert the welded upper clip connector 5-2 into the lower clip connector 5-1 at the bottom of the packer 4 along the rectangular groove. After it is in place, rotate it clockwise and insert four locking blocks 5-4 into the slot. Finally, assemble the clamping device 5-3 and ensure that the clamping device 5-3 is rotated into place.

[0069] S5: Repeat S1 to S4, assemble the sub-deep single-channel cable intelligent water distribution device 6, tubing 3, card cable connector 5, packer 4 and downhole control cable 2.

[0070] S6: Repeat S1 to S5 to complete the installation of the downhole single-channel cable-operated intelligent water distribution device 6, tubing 3, card-type cable connector 5, packer 4 and downhole control cable 2 for all water injection wells.

[0071] S7: Connect the assembled downhole control cable 2 to the single-channel intelligent water distribution control center 1.

[0072] S8: Install intelligent monitoring and adjustment valve 8 at the wellhead tubing 3 and connect tubing 3 to the water injection main pipe 9.

[0073] S9: Use the ground control cable 7 to connect the intelligent measuring and adjusting valve 8 and the water injection pump 10 of the entire platform to the single-channel intelligent water distribution control center 1.

[0074] S10: Activate the single-channel intelligent water distribution control center 1, and input parameters such as the required injection volume for each layer of each injection well into the single-channel intelligent water distribution control center 1.

[0075] S11: Turn on the intelligent measuring and adjusting valve 8, the water injection pump 10 and the single-channel cable intelligent measuring and adjusting water distributor 6 to start water injection.

[0076] S12: In the single-channel intelligent water distribution control center 1, activate the flow self-checking and self-control function of the single-channel cable intelligent measuring and adjusting water distributor 6 and intelligent measuring and adjusting valve 8 to automatically match the water injection volume of each layer, each well and each water injection pipeline.

[0077] S13: Enable the remote control function of the single-channel intelligent water distribution control center 1 to provide complete and real-time platform water injection well information for onshore oil reservoir staff.

[0078] The advantages and positive effects of this invention are:

[0079] This invention is based on a single-channel cable-connected intelligent water distribution device with complete testing functions. It realizes the coordinated control of all water injection wells, water injection pipelines and water injection pumps on the offshore platform, and automatically allocates the water injection volume of each water injection well and each layer. It effectively solves the problems of coordinated control of water injection wells and water injection pipelines and remote control of the entire platform under the large-scale testing needs of the offshore platform, and transforms the previous single-well injection into full-platform injection.

[0080] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made in accordance with the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A single-channel intelligent control water distribution system for water injection wells on offshore platforms, characterized in that: The system includes a single-channel intelligent water distribution control center, downhole control cables, tubing, packers, cable connectors, a single-channel wired intelligent water distribution device, surface control cables, intelligent control valves, a main water injection pipe, and a water injection pump. The single-channel intelligent water distribution control center is connected to the platform's water injection wells via the downhole control cable, enabling data transmission and control between the downhole and platform. The packer has two symmetrically embedded cable connectors at its upper and lower ends for easy passage of the downhole control cable. The single-channel intelligent water distribution control center is connected to the platform's intelligent control valve and the water injection pump via the surface control cable. The control cable connects to the intelligent measuring and adjusting valve, the water injection pump, and the single-channel intelligent water distribution control center to realize data transmission and control. The clip-on cable connector consists of a lower clip-on connector, an upper clip-on connector, a clamping device, and a locking block. The lower clip-on connector has, from bottom to top, a signal connection hole, an O-ring sealing groove, a first push-type sealing groove, a locking groove, a second push-type sealing groove, a rectangular groove, and an external thread. There are two O-ring sealing grooves, and the O-rings inside the O-ring sealing grooves cooperate with the sealing rings in the first and second push-type sealing grooves to form... The system features a quadruple seal. The slot has three layers, each layer being an upwardly sloping rectangular annular groove. The slot has four circumferentially distributed rectangular grooves running vertically through it. The card-type upper connector is welded to the cut downhole control cable. The upper connector structure, from bottom to top, consists of a signal connector plug, an O-ring seal, a push-type sealing surface, a card block, a push-type sealing block, and the cable. The signal connector plug mates with the signal connection hole to enable downhole signal transmission. The card block comprises three layers arranged in four rows, each card block being an upwardly sloping rectangular groove. The clips are connected to the slots to ensure that the upper and lower clips are axially fixed and can withstand axial loads. The clamp has an internal thread that connects with the external thread. The clamp presses the upper clip into the lower clip to ensure that the sealing rings in the first and second push-type sealing grooves are successfully sealed. There are four clips that are embedded in the rectangular grooves in the lower clip to restrict the circumferential movement of the assembled upper clip within the lower clip.

2. The single-channel intelligent control water distribution system for offshore platform water injection wells according to claim 1, characterized in that: The single-channel cable-operated intelligent water distribution device comprises a cable protector, cable connector, upper connector, pull ring, retaining ring, fixing ring, sealing connector, protective module sheath, circuit module sheath, main channel pipe, lower connector, motor assembly, water tap assembly, internal pressure measurement module, temperature measurement module, external pressure measurement module, flow test module, and outer sheath. The cable protector has a through-hole on its side to protect the cable connector. The cable protector is threaded to the upper connector. The lower outer side of the upper connector has a retaining ring groove, in which the retaining ring and fixing ring are fitted. The pull ring has threads on its exterior. The upper and lower parts of the pull ring are respectively subjected to… The upper connector shaft step and the retaining ring provide axial positioning. During assembly, they are fitted onto the upper connector and used in conjunction with the retaining ring and the fixing ring. When assembling the outer protective tube, the upper connector is fixedly connected to the outer protective tube without rotating. The sealing joint is fitted onto the outside of the main channel pipe. The lower side of the sealing joint is fixedly connected to the protection module protective tube, the circuit module protective tube, and the motor assembly. The protection module protective tube contains the power-off module of the single-channel cable-connected intelligent water distribution device. The circuit module protective tube contains the core control circuit board of the single-channel cable-connected intelligent water distribution device, which is used to protect the core control circuit board.

3. A single-channel intelligent control water distribution system for offshore platform water injection wells according to claim 2, characterized in that: The motor assembly consists of an upper protective tube, a motor, a coupling, limit rings, springs, an upper lead screw, an upper nut, bearings, a middle protective tube, a lower protective tube, a lower lead screw, a lower nut, and a power-off trigger point. Two limit rings are fitted inside the middle of the upper protective tube; each limit ring is fixedly connected to one of the springs. A travel groove is provided inside the middle of the upper protective tube, with two power-off trigger points installed at its upper and lower ends. A travel protrusion is provided on the outside of the upper nut. The upper nut, the upper lead screw, the travel groove, and the travel protrusion work together to convert the rotational motion of the motor into the linear motion of the upper lead screw. The springs, the power-off trigger points, and the travel protrusion work together to limit the water nozzle travel. The springs buffer excessive rotational motion of the motor, preventing damage to the motor assembly components due to excessive rotation.

4. A single-channel intelligent control water distribution system for offshore platform water injection wells according to claim 1 or 2, characterized in that: The single-channel intelligent water distribution control center includes an underground single-channel intelligent water distribution control center, a surface single-channel intelligent water distribution control center, and an auxiliary single-channel intelligent water distribution control center. The underground single-channel intelligent water distribution control center consists of a CPU processing center, a water absorption capacity calculation module, a signal receiving / transmitting module, a water injection volume self-checking and self-control module, and a remote communication control module. The surface single-channel intelligent water distribution control center consists of a CPU processing center, a flow rate self-checking and self-control module, a signal receiving / transmitting module, and a remote communication control module. The auxiliary single-channel intelligent water distribution control center consists of a storage module, a display module, and a power supply module.

5. A single-channel intelligent control water distribution method for offshore platform water injection wells, utilizing the single-channel intelligent control water distribution system for offshore platform water injection wells as described in any one of claims 1 to 4, characterized in that: Includes the following steps, S1: Equipped with a single-channel cable-operated intelligent water distribution device and tubing at the deepest layer of a single injection well; S2: Cut a downhole control cable according to the current formation depth. Connect one end of the downhole control cable to the upper end of the single-channel wired intelligent measuring and adjusting water distribution device, and weld the other end of the downhole control cable to the card-type upper connector. S3: Embed the two cassette lower connectors into the upper and lower end faces of the packer in a mirror image, ensuring that the external threads of the cassette lower connectors are always exposed. S4: Insert the welded upper clip into the lower clip of the packer along the rectangular groove. After it is in place, rotate it clockwise and insert four locking blocks into the slot. Finally, assemble the clamp and ensure that the clamp is rotated into place. S5: Repeat S1 to S4, assembling the sub-deep single-channel cable-operated intelligent water distribution device, tubing, cassette cable connector, packer, and downhole control cable; S6: Repeat S1 to S5 to complete the installation of downhole single-channel cable-operated intelligent water distribution device, tubing, card-type cable connector, packer and downhole control cable for all water injection wells; S7: Connect the assembled downhole control cable to the single-channel intelligent water distribution control center; S8: Install an intelligent monitoring and adjustment valve at the wellhead tubing and connect the tubing to the main water injection pipe; S9: Connect the platform's intelligent control valve and water injection pump to the single-channel intelligent water distribution control center using ground control cables; S10: Activate the single-channel intelligent water distribution control center and input the required injection volume parameters for each layer of each injection well into the single-channel intelligent water distribution control center; S11: Turn on the intelligent control valve, water pump and single-channel cable intelligent control water distributor to start water injection; S12: In the single-channel intelligent water distribution control center, activate the flow self-checking and self-control function of the single-channel cable intelligent measuring and adjusting water distributor and intelligent measuring and adjusting valve to automatically match the water injection volume of each layer, each well and each water injection pipeline. S13: Enable the remote control function of the single-channel intelligent water distribution control center to provide complete and real-time platform water injection well information for onshore oil reservoir staff.

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