Dual-control underground intelligent layered water injection process system and method

Abstract

The dual-control underground intelligent layered water injection process system comprises a working barrel electric control part and a testing and adjusting instrument testing and adjusting part, the working barrel electric control part comprises a plurality of water injection working barrels and a plurality of layered insertion seals, and the water injection working barrels are connected with a ground controller through working barrel cables; the working barrel electric control part adopts an electric control mode to carry out adjustment and parameter monitoring on the water injection working barrel; the measuring and adjusting instrument measuring and adjusting part comprises a measuring and adjusting instrument and a steel wire cable, the two ends of the steel wire cable are connected with the measuring and adjusting instrument and the ground controller respectively, when the working barrel electric control part breaks down, the measuring and adjusting instrument is placed in an oil pipe, the measuring and adjusting instrument measuring and adjusting part controls the water injection working barrel in a measuring and adjusting mode, and measuring and adjusting and real-time data monitoring of the water injection working barrel are achieved. The underground working barrel is tested and adjusted in a one-standby and one-use composite mode, and the testing and adjusting reliability of the pipe column technology is improved. And the two can be used together to calibrate and calibrate the cable injection allocation function of the working barrel, so that the injection allocation accuracy is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent measurement and adjustment of offshore oil fields, and in particular relates to a dual-control downhole intelligent stratified water injection process system and method. Background Art

[0002] The intelligent cable measurement and adjustment technology for offshore oil fields has effectively solved the problem of water injection measurement and adjustment, and has made great contributions to the fine water injection of offshore oil fields.

[0003] At present, the reliability of process strings is insufficient, and the single cable measurement and control method means that once a downhole tool failure or cable communication failure occurs, the downhole water injection volume can only be measured and adjusted by replacing the string, which increases operating costs and affects the injection and production effect and efficiency.

[0004] Therefore, in response to the above problems, a dual-control downhole intelligent stratified water injection process system and method is proposed, which optimizes the existing measurement and control methods to form a dual-control cable intelligent water injection process and operation method. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide a dual-control downhole intelligent stratified water injection process system and method. The method adopts a composite control method of two flow control methods, namely electronic control and flow control while measuring and adjusting, to make up for the shortcomings of the process in the measurement and control mode, improve the reliability of the process string, extend the life of the process string, and provide strong technical support for oil field exploitation.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a dual-control downhole intelligent stratified water injection process system, including a working barrel electrical control part and a measuring and adjusting instrument measuring and adjusting part, the working barrel electrical control part includes a tubing casing, and the tubing casing includes, from top to bottom, an oil pipe, multiple water injection working barrels, multiple layered insertion seals and round plugs, and multiple water injection working barrels are connected to the ground controller through a working barrel cable, and the working barrel electrical control part adopts an electrical control method to adjust and monitor the parameters of the water injection working barrel; the measuring and adjusting instrument measuring and adjusting part includes a measuring and adjusting instrument and a steel wire cable, the measuring and adjusting instrument is connected to one end of the steel wire cable, and the other end of the steel wire cable is connected to the ground controller. When the working barrel electrical control part fails, the measuring and adjusting instrument is placed in the oil pipe, and the measuring and adjusting instrument measuring and adjusting part controls the water injection working barrel in a measuring and adjusting manner to realize the measurement and adjustment of the water injection working barrel and real-time data monitoring.

[0007] Furthermore, the upper end of the working barrel cable is connected to the dedicated interface of the oil production tree, and the lower end of the working barrel cable is respectively connected to each of the water injection working barrels. The working barrel cable integrates two cables, power and communication, to provide power and cable communication for each of the water injection working barrels.

[0008] Furthermore, a downhole safety valve and a cable positioning seal are sequentially provided between the oil pipe and the first water injection mandrel from top to bottom, and the downhole safety valve is connected to the safety valve hydraulic control pipeline.

[0009] Furthermore, an oil pipe hanger is provided on the top of the oil pipe.

[0010] Furthermore, the water injection manifold includes, from top to bottom, a first water injection manifold, a second water injection manifold, a third water injection manifold and a fourth water injection manifold, and the layered insert seal includes, from top to bottom, a first layered insert seal, a second layered insert seal and a third layered insert seal.

[0011] Furthermore, it also includes a steel cable winch, on which the steel cable is wound.

[0012] Furthermore, the present invention also provides a dual-control downhole intelligent stratified water injection process method, which utilizes the above-mentioned dual-control downhole intelligent stratified water injection process system, including the following steps:

[0013] S1: When the downhole water injection mandrel is operating normally, the water injection mandrel is adjusted and parameters are monitored by electronic control;

[0014] S2: When the water injection mandrel cannot transmit electrical signals, the water injection mandrel is controlled by a measuring and adjusting instrument in a measuring and adjusting manner to achieve measurement and adjustment of the water injection mandrel and real-time data monitoring.

[0015] Furthermore, the S1 includes the following steps:

[0016] S11: The ground controller is connected to the dedicated interface of the Christmas tree;

[0017] S12: The ground controller sends an action instruction to the water injection mandrel on each floor to adjust the opening of the water nozzle of the water injection mandrel;

[0018] S13: The water injection mandrel transmits the flow rate, pressure, and temperature parameters to the ground controller for display via a communication cable;

[0019] S14: When the injection amount of each layer reaches the required value, the water nozzle of the water injection working cylinder stops moving, completing the regulation.

[0020] Furthermore, the S2 includes the following steps:

[0021] S21: Connect one end of a steel cable to the measuring and adjusting instrument and the other end to the ground controller, and lower the measuring and adjusting instrument layer by layer into each water injection mandrel through the steel cable for docking;

[0022] S22: Sending instructions via the ground controller to adjust the water nozzle opening of the dual-control mechanism in the water injection mandrel, and the measuring and adjusting instrument transmitting the flow, pressure, and temperature parameters at the water injection mandrel to the ground in real time via the steel cable;

[0023] S23: When the flow rate reaches the set value, the measuring and adjusting instrument stops operating, completing the measurement and adjustment;

[0024] S24: placing the measuring and adjusting instrument into the next water injection mandrel through the steel cable, repeating the above steps S22-S23, and adjusting the flow of each water injection mandrel layer by layer.

[0025] Furthermore, the following operation is also included: when the cable control of the water injection mandrel is normal, the measuring and adjusting instrument is lowered into the water injection mandrel to calibrate the cable injection function of the water injection mandrel to improve the injection accuracy.

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

[0027] 1. This invention uses a hybrid approach of electronic control and on-the-go adjustment to adjust the downhole mandrel. If the electronic control fails, on-the-go adjustment can be used, improving the reliability of string operation. Alternatively, a combination of both can be used. When cable control is functioning normally, a on-the-go adjustment instrument can be lowered into the mandrel to calibrate the mandrel's cable injection function, improving injection accuracy.

[0028] 2. The present invention reduces the production cost of the cable-controlled stratified water injection process. In the existing process, when the electric control of the downhole mandrel fails, there is no backup measurement and adjustment means, and the function of the pipe string can only be restored by replacing the pipe string, which is expensive. When the electric control fails, the present process can carry out measurement and adjustment through backup means without replacing the pipe string, thus saving the time of replacing the pipe string once and effectively saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the pipe column structure according to an embodiment of the present invention.

[0030] Figure 2 yes Figure 1 Schematic diagram of the string structure where the test and adjustment instrument is lowered via a steel wire cable after a string failure occurs.

[0031] Figure 3 2 is a schematic structural diagram of a measuring and adjusting instrument according to an embodiment of the present invention.

[0032] Figure 4 It is a schematic diagram of the overall process of an embodiment of the method of the present invention.

[0033] In the picture:

[0034] 1. Tubing hanger; 2. Tubing; 3. Casing string;

[0035] 4. Downhole safety valve; 5. Positioning seal; 6. First water injection mandrel;

[0036] 7. First layer insert seal; 8. Second water injection mandrel; 9. Second layer insert seal;

[0037] 10. Third water injection working cylinder; 11. Third layered insert seal; 12. Fourth water injection working cylinder;

[0038] 13. Round plug; 14. Steel wire cable; 15. Tester;

[0039] 16. Safety valve hydraulic control line; 17. Mandrel cable; 18. Ground controller;

[0040] 19. Wire cable winch. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0044] The embodiments of the present invention are further described below with reference to the accompanying drawings:

[0045] like Figure 1、 Figure 2 As shown, a dual-control downhole intelligent stratified water injection process system includes a mandrel electronic control unit and a measuring and adjusting instrument measurement and adjustment unit. The mandrel electronic control unit includes a tubing string casing 3. The tubing string casing 3 contains, from top to bottom, a tubing hanger 1, tubing 2, a downhole safety valve 4, a positioning seal 5, multiple water injection mandrels, multiple stratified insert seals, and a round plug 13. The multiple water injection mandrels are connected to a surface controller 18 via mandrel cables 17. The mandrel electronic control unit electronically adjusts the water injection mandrels and monitors their parameters. The measuring and adjusting instrument measurement and adjustment unit includes a measuring and adjusting instrument 15 and a steel cable 14. The measuring and adjusting instrument 15 is connected to one end of the steel cable 14, and the other end of the steel cable 14 is connected to the surface controller 18, providing power and bidirectional data transmission for the measuring and adjusting instrument 15. Preferably, the steel wire cable 14 is wound on the steel wire cable winch 19. When the electronic control part of the working cylinder fails, the measuring and adjusting instrument 15 is lowered into the well and docked with the water injection working cylinder in the manner of the steel wire cable 14. The measuring and adjusting part of the measuring and adjusting instrument controls the water injection working cylinder in a measuring and adjusting manner, thereby realizing the measurement and adjustment of the water injection working cylinder and real-time data monitoring.

[0046] Preferably, the water injection working cylinder provided in this embodiment includes, from top to bottom, a first water injection working cylinder 6, a second water injection working cylinder 8, a third water injection working cylinder 10 and a fourth water injection working cylinder 12. Multiple water injection working cylinders realize water injection of each isolation layer section, and have two flow regulation control methods: cable electric control and measurement and adjustment. The internal pressure, external pressure, flow, temperature and other parameters at the working cylinder can be fed back in real time.

[0047] The layered insert seal comprises, from top to bottom, a first layered insert seal 7, a second layered insert seal 9 and a third layered insert seal 11, for achieving stratification between the layers.

[0048] Specifically, such as Figure 1 As shown, this embodiment takes the sand control section with four water injection layers as an example. The pipe string is lowered into the well in the order of round plug 13, fourth water injection mandrel 12, third inserted seal 11, third water injection mandrel 10, second inserted seal 9, second water injection mandrel 8, first inserted seal 7, first water injection mandrel 6, top layer inserted seal, positioning seal 5, downhole safety valve 4, and oil pipe 2. The tools are connected with the oil pipe 2. During the lowering process, the mandrel cable 17 is connected in series with each layer of water injection mandrel and layered inserted seal, and lowered together with the pipe string. The mandrel cable 17 is tied to the pipe string with a cable clip.

[0049] like Figure 1 As shown, the upper end of the mandrel cable 17 is connected to the dedicated interface of the Christmas tree, and the lower end of the mandrel cable 17 is connected to each water injection mandrel. The mandrel cable 17 integrates two cables, power and communication, to provide power and cable communication for each water injection mandrel. Figure 1As shown, downhole safety valve 4 is connected to safety valve hydraulic control line 16, which is connected to the hydraulic control channel of the wellhead Christmas tree via safety valve hydraulic control line 16. During production string operation, safety valve hydraulic control line 16 maintains pressure, keeping the valve plate of downhole safety valve 4 in a normally open state.

[0050] like Figure 3 As shown, the measuring and adjusting instrument 15 provided in this embodiment has a built-in torque motor, which can adjust the opening of the water nozzle of the water injection working cylinder, and has the function of monitoring parameters such as downhole pressure, temperature, and flow.

[0051] The surface controller 18 provided in this embodiment is connected to the measuring and adjusting instrument 15 or the dedicated interface of the oil production tree. It can issue action instructions to the measuring and adjusting instrument 15 and the water injection mandrel through the wire cable 14 and the mandrel cable 17 inserted along the pipe string to adjust the opening of the water nozzle of the water injection mandrel. At the same time, it can receive flow, pressure, temperature and other signals fed back by the measuring and adjusting instrument 15 or the water injection mandrel and display the information in real time.

[0052] It should be noted that the present invention is applicable to wells with inclinations less than 60° and features two flow rate regulation methods: a cabled intelligent process and a measurement-and-adjustment process. When the cabled control of the water injection mandrel is functioning normally, a measurement-and-adjustment instrument 15 can be lowered into the mandrel to calibrate the cabled injection function of the mandrel and improve injection accuracy. This method of adding a backup measurement and adjustment mechanism to the cabled intelligent water injection mandrel, providing the cabled intelligent water injection process with a backup measurement and adjustment function and extending the service life of the tubing, is also protected by this application.

[0053] like Figure 4 As shown, the present invention also provides a dual-control downhole intelligent stratified water injection process method, using the above-mentioned dual-control downhole intelligent stratified water injection process system, including the following steps:

[0054] S1: When the downhole water injection mandrel is working normally, the water injection mandrel is adjusted and parameter monitoring is performed using an electronic control method. Specifically, S1 includes the following steps:

[0055] S11: The ground controller 18 is connected to the dedicated interface for the Christmas tree.

[0056] S12: The ground controller 18 sends an action instruction to the water injection mandrels of each layer to adjust the opening of the water nozzles of the water injection mandrels.

[0057] S13: The water injection mandrel transmits the flow rate, pressure and temperature parameters to the ground controller 18 via the communication cable for display.

[0058] S14: When the injection amount of each layer reaches the required value, the water nozzle of the water injection working cylinder stops moving and the regulation is completed.

[0059] S2: When the water injection mandrel is unable to be powered and communicated due to a short circuit, a break in the mandrel cable 17, etc., the water injection mandrel is controlled by the measuring and adjusting instrument 15 in a simultaneous measurement and adjustment manner. The formation parameters such as the internal pressure, external pressure, flow rate, and temperature of the water injection mandrel can be transmitted to the surface in real time through the measuring and adjusting instrument 15 via the steel cable 14, thereby achieving measurement and adjustment of the water injection mandrel and real-time data monitoring. Specifically, S2 includes the following steps:

[0060] S21: Connect one end of the steel cable 14 to the measuring and adjusting instrument 15 and the other end to the ground controller 18. The ground controller 18 is powered and the measuring and adjusting instrument 15 is lowered layer by layer into each water injection working cylinder through the steel cable 14 for docking.

[0061] S22: Send instructions through the ground controller 18 to adjust the water nozzle opening of the dual-control mechanism in the water injection mandrel, and the measuring and adjusting instrument 15 transmits the flow, pressure, and temperature parameters at the water injection mandrel to the ground in real time through the steel cable 14.

[0062] S23: When the dual control mechanism is activated, the original water nozzle channel is closed synchronously and the new flow channel is switched to ensure the uniqueness of the water injection flow channel, thereby achieving accurate flow regulation. When the flow rate reaches the set value, the measuring and adjusting instrument 15 stops operating, completing the measurement and adjustment.

[0063] S24: Place the measuring and adjusting instrument 15 into the water injection mandrel of the next layer through the steel cable 14, and repeat the above steps S22-S23 to adjust the flow rate of each water injection mandrel layer by layer.

[0064] It should be noted that the following operations are also included. When the cable control of the water injection working cylinder is normal, the measuring and adjusting instrument 15 can be lowered into each working cylinder through the wire cable 14 equipment, and the flow, pressure, temperature and other parameters fed back by the measuring and adjusting instrument 15 are compared with the flow, pressure, temperature and other parameters fed back by the cable intelligent water injection working cylinder, and the cable injection function of the water injection working cylinder is calibrated to improve the injection accuracy.

[0065] The advantages and positive effects of the present invention are:

[0066] 1. This invention uses a hybrid approach of electronic control and on-the-go adjustment to adjust the downhole mandrel. If the electronic control fails, on-the-go adjustment can be used, improving the reliability of string operation. Alternatively, a combination of both can be used. When cable control is functioning normally, a on-the-go adjustment instrument can be lowered into the mandrel to calibrate the mandrel's cable injection function, improving injection accuracy.

[0067] 2. The present invention reduces the production cost of the cable-controlled stratified water injection process. In the existing process, when the electric control of the downhole mandrel fails, there is no backup measurement and adjustment means, and the function of the pipe string can only be restored by replacing the pipe string, which is expensive. When the electric control fails, the present process can carry out measurement and adjustment through backup means without replacing the pipe string, thus saving the time of replacing the pipe string once and effectively saving production costs.

[0068] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A dual-control downhole intelligent stratified water injection process system, characterized by: It includes a working barrel electronic control part and a measuring and adjusting instrument measuring and adjusting part. The working barrel electronic control part includes a tubing casing. The tubing casing includes an oil pipe, multiple water injection working barrels, multiple layered insertion seals and round plugs from top to bottom. The multiple water injection working barrels are connected to the ground controller through a working barrel cable. The working barrel electronic control part uses an electronic control method to adjust and monitor the parameters of the water injection working barrel; the measuring and adjusting instrument measuring and adjusting part includes a measuring and adjusting instrument and a steel wire cable. The measuring and adjusting instrument is connected to one end of the steel wire cable, and the other end of the steel wire cable is connected to the ground controller. When the working barrel electronic control part fails, the measuring and adjusting instrument is placed in the tubing, and the measuring and adjusting instrument measuring and adjusting part controls the water injection working barrel in a measuring and adjusting method to realize the measurement and adjustment of the water injection working barrel and real-time data monitoring.

2. The dual-control downhole intelligent stratified water injection process system according to claim 1 is characterized by: The upper end of the working barrel cable is connected to the dedicated interface of the oil production tree, and the lower end of the working barrel cable is respectively connected to each of the water injection working barrels. The working barrel cable integrates two cables, power and communication, to provide power and cable communication for each of the water injection working barrels.

3. A dual-control downhole intelligent stratified water injection process system according to claim 1 or 2, characterized in that: A downhole safety valve and a cable positioning seal are sequentially provided between the oil pipe and the first water injection mandrel from top to bottom, and the downhole safety valve is connected to the safety valve hydraulic control pipeline.

4. A dual-control downhole intelligent stratified water injection process system according to claim 1 or 2, characterized in that: An oil pipe hanger is provided on the top of the oil pipe.

5. A dual-control downhole intelligent stratified water injection process system according to claim 1 or 2, characterized in that: The water injection mandrel includes a first water injection mandrel, a second water injection mandrel, a third water injection mandrel and a fourth water injection mandrel from top to bottom, and the layered insert seal includes a first layered insert seal, a second layered insert seal and a third layered insert seal from top to bottom.

6. A dual-control downhole intelligent stratified water injection process system according to claim 1 or 2, characterized in that: Also included is a steel cable winch on which the steel cable is wound.

7. A dual-control downhole intelligent stratified water injection process method, utilizing the dual-control downhole intelligent stratified water injection process system according to any one of claims 1 to 6, characterized in that: The following steps are included: S1: When the downhole water injection mandrel is operating normally, the water injection mandrel is adjusted and parameters are monitored by electronic control; S2: When the water injection mandrel cannot transmit electrical signals, the water injection mandrel is controlled by a measuring and adjusting instrument in a measuring and adjusting manner to achieve measurement and adjustment of the water injection mandrel and real-time data monitoring.

8. The dual-control downhole intelligent stratified water injection process according to claim 7, characterized in that: Said S1 comprises the following steps, S11: The ground controller is connected to the dedicated interface of the Christmas tree; S12: The ground controller sends an action instruction to the water injection mandrel on each floor to adjust the opening of the water nozzle of the water injection mandrel; S13: The water injection mandrel transmits the flow rate, pressure, and temperature parameters to the ground controller for display via a communication cable; S14: When the injection amount of each layer reaches the required value, the water nozzle of the water injection working cylinder stops moving, completing the regulation.

9. A dual-control downhole intelligent stratified water injection process according to claim 7 or 8, characterized in that: Said S2 comprises the following steps, S21: Connect one end of a steel cable to the measuring and adjusting instrument and the other end to the ground controller, and lower the measuring and adjusting instrument layer by layer into each water injection mandrel through the steel cable for docking; S22: Sending instructions via the ground controller to adjust the water nozzle opening of the dual-control mechanism in the water injection mandrel, and the measuring and adjusting instrument transmitting the flow, pressure, and temperature parameters at the water injection mandrel to the ground in real time via the steel cable; S23: When the flow rate reaches the set value, the measuring and adjusting instrument stops operating, completing the measurement and adjustment; S24: placing the measuring and adjusting instrument into the next water injection mandrel through the steel cable, repeating the above steps S22-S23, and adjusting the flow of each water injection mandrel layer by layer.

10. A dual-control downhole intelligent stratified water injection process according to claim 7 or 8, characterized in that: It also includes the following operations: when the cable control of the water injection mandrel is normal, the measuring and adjusting instrument is lowered into the water injection mandrel to calibrate the cable injection function of the water injection mandrel to improve the injection accuracy.

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