Hydraulic control downhole flow control device and control method thereof

Abstract

The invention discloses a hydraulic control downhole flow control device. Comprising a first underground flow controller to an Mth underground flow controller which are respectively arranged on an underground production pipe column; the ground controller drives the Mth downhole flow controller through an L1 hydraulic pipeline and an (M + 1) th hydraulic pipeline and measures pressure and flow data of the hydraulic pipelines; wherein the hydraulic pipelines from L1 to (M + 1) th are connected to a ground controller at a wellhead from an underground flow controller located at an underground production pipe column; the L1 hydraulic pipeline and the (M + 1) th hydraulic pipeline are interlocked, and the L1 hydraulic pipeline and the (M + 1) th hydraulic pipeline are interlocked. The device has the beneficial effects that the underground flow can be accurately adjusted, and changes of underground conditions can be quickly responded. The method is crucial for ensuring the continuity and efficiency of oil gas extraction.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole flow control, and in particular to a hydraulically controlled downhole flow control device and a control method thereof. Background Art

[0002] In the process of oil and gas well exploitation, flow control is crucial to the effective extraction of resources, underground safety and environmental protection. Traditional underground flow control methods mainly rely on mechanical or semi-automatic control systems. These systems usually require intervention from ground operators to adjust the flow or rely on simple mechanical devices to respond to changes in underground pressure. However, these traditional methods have obvious limitations, such as the inability to provide precise flow regulation, especially under complex or changing underground conditions; requiring ground personnel to operate, increasing labor costs and possible safety risks; slow response speed, and unable to adapt to rapid changes in the underground environment in a timely manner.

[0003] With the development of automation and intelligent technology, downhole flow control methods have begun to develop in a more efficient and precise direction. For example, the patent "Downhole Electric Control Variable Flow Control Valve" (application number: CN202360078U) proposes a downhole electric control variable flow controller, which aims to improve the accuracy and reliability of downhole fluid control. However, even these advanced systems face challenges such as complex electronic equipment and software dependence, high costs, and the need for expertise in maintenance and operation.

[0004] The papers "A Hydraulically Controlled Downhole Multi-stage Water Injection Sleeve for Intelligent Well Completion" and "Development and Application of Hydraulic-controlled Downhole Flow Controller" explore the application of hydraulically controlled downhole flow control technology in the field of intelligent well completion. These studies show the potential of hydraulic control systems in oil and gas well production, but also expose the space for further optimization and innovation.

[0005] The present invention aims to solve the above problems and provide a more reliable, accurate and cost-effective hydraulic downhole flow control device and control method thereof, which not only improves the control accuracy, but also increases the stability and operability of the system, making it more suitable for complex and changing oil and gas well environments. Summary of the invention

[0006] The object of the present invention is to provide a hydraulically controlled downhole flow control device, wherein N downhole flow controllers are arranged in sequence from top to bottom on the downhole production pipe string, and the ground controller controls the flow of the downhole flow through the L1 hydraulic pipeline and the L M+1 The hydraulic pipeline drives the Mth downhole flow controller, which improves the control accuracy and increases the stability and operability of the system.

[0007] The purpose of the present invention is to provide a hydraulically controlled downhole flow control method, wherein the Nth downhole flow controllers are arranged in sequence from top to bottom on the downhole production string, and the ground controller controls the flow of the downhole flow through the L1 hydraulic pipeline and the L M+1 The hydraulic pipeline drives the Mth downhole flow controller, which improves the control accuracy and increases the stability and operability of the system.

[0008] To achieve the above object, the present invention adopts the following technical solutions, including:

[0009] The Nth downhole flow controllers are arranged on the downhole production string in order from top to bottom;

[0010] Ground control, which is connected through L1 hydraulic line and L M+1 The hydraulic pipeline drives the Mth downhole flow controller; the surface controller measures the flow from L1 hydraulic pipeline to L M+1 Pressure and flow data of hydraulic pipelines;

[0011] Among them, the L1 hydraulic pipeline to L M+1 The hydraulic pipeline is connected from the downhole flow controller located in the downhole production string to the surface controller at the wellhead; M+1 Solenoid valves are respectively provided on the hydraulic pipelines; when the solenoid valve on one of the two hydraulic pipelines connected to the same downhole flow controller is opened, the solenoid valve on the other hydraulic pipeline is closed, forming an interlock; N is a natural number greater than or equal to 2; M=1, 2, ..., N.

[0012] Preferably, the downhole flow controller comprises:

[0013] An outer sleeve, wherein an annular groove is provided on the inner circumference of the upper portion;

[0014] The central shaft is axially movably arranged in the outer sleeve, and an enlarged portion is provided on the outer periphery of the upper middle portion of the central shaft; the outer periphery of the central shaft on both sides of the annular groove is sealed and connected with the inner periphery of the outer sleeve; a first piston cavity and a second piston cavity are formed between the two sides of the enlarged portion and the annular groove; the outer periphery of the enlarged portion is sealed and matched with the inner wall of the annular groove;

[0015] The inner ends of the first interface and the second interface are connected to the first piston chamber and the second piston chamber respectively, and the outer ends of the first interface and the second interface are connected to the L1 hydraulic pipeline and the L2 hydraulic pipeline respectively. M+1 Hydraulic line connections;

[0016] The outer sleeve hole and the central axis hole are radially arranged at the lower part of the outer sleeve and the central axis respectively. By pressing the first piston cavity or the second piston cavity, the overlap between the outer sleeve hole and the central axis hole is controlled to adjust the opening of the downhole flow controller.

[0017] Preferably, the central axis hole is composed of 7 through holes arranged in sequence; the downhole flow controller is provided with 8 openings, and the 8 openings are represented by numbers 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7, respectively, and n represents the current opening; the ground controller controls the opening size of the downhole flow controller by pressure.

[0018] Preferably, it also includes:

[0019] a sensor disposed in a ground controller;

[0020] The host computer has a detector disposed therein, and the host computer is connected to the sensor in electronic communication. When the detector detects that the communication is momentarily interrupted, the host computer issues an instruction to the ground controller, and the ground controller re-collects and verifies the signal, and performs subsequent operations after confirming that it is correct.

[0021] A control method for a hydraulically controlled downhole flow control device as described in any one of the above, comprising the following steps:

[0022] S1, respectively setting N downhole flow controllers on the downhole production string;

[0023] S2, ground controller output L1 hydraulic pipeline to L M+1 Hydraulic lines;

[0024] S3, ground controller through L1 hydraulic pipeline and L M+1 The hydraulic pipeline drives the Mth downhole flow controller;

[0025] Among them, the L1 hydraulic pipeline to L M+1 Solenoid valves are respectively provided on the hydraulic pipelines; when the solenoid valve on one of the two hydraulic pipelines connected to the same downhole flow controller is opened, the solenoid valve on the other hydraulic pipeline is closed, forming an interlock; N is a natural number greater than or equal to 2; M=1, 2, ..., N.

[0026] Preferably, the pressure-increasing action of the downhole flow controller includes a pressure-increasing step and a pressure-releasing step. The pressure-increasing step is completed first, and then the pressure-releasing step is completed. When both steps are completed, the pressure-increasing action is considered to be completed.

[0027] Preferably, when L M+1 After the hydraulic pipeline starts the pressurization operation, when conditions 1 to 5 are met at the same time and the waiting time is delayed for Ty, the pressurization step is considered to be completed; L M+1 After the hydraulic pipeline starts the pressure relief operation, when condition six is ​​met and the waiting time is delayed for Ty, the pressure relief step is considered to be completed;

[0028] After the L1 hydraulic pipeline starts the pressure-injection operation, when conditions seven to eleven are met at the same time, and after the delay waiting time Ty, the pressure-injection step is considered to be completed; after the L1 hydraulic pipeline starts the pressure-relieving operation, when condition twelve is met, and after the delay waiting time Ty, the pressure-relieving step is considered to be completed;

[0029] The determination conditions one to twelve are as follows:

[0030] Condition 1: When L M+1 The pipeline is pressurized, and L M+1 P>LPi, and L M+1 T>L M+1 When Ti, it is considered that condition 1 is met;

[0031] Condition 2: When L M+1 The pipeline is pressurized, and L M+1 Q>LQi1, and after Td time, L M+1 Q≤LQi2, it is considered that condition 2 is met;

[0032] Condition 3: When L M+1 The pipeline is pressurized, and L1Q>LQi3, and after Td time, L1Q≤LQi4, it is considered that condition three is met;

[0033] Condition 4: When L M+1 The pipeline is pressurized, and L M+1 VH>LVi 1, it is considered that condition 4 is met;

[0034] Condition 5: When L M+1 The pipeline is pressurized, and L1VL>LVi2, which is considered to meet condition five;

[0035] Condition 6: When L M+1 The pipeline is depressurized, and L M+1 Q>LQi5, and after Tx time, L M+1 Q≤LQi6, it is considered that condition six is ​​met;

[0036] Condition 7: When the L1 pipeline is pressurized, and L1P>LPi, and L1T>L1Ti, it is considered that condition 7 is met;

[0037] Condition 8: When the L1 pipeline is pressurized, and L1Q>LQi1, and after Td time, L1Q≤LQi2, it is considered that condition 8 is met;

[0038] Condition 9: When the L1 pipeline is pressurized and L M+1 Q>LQi3, and after Td time, L M+1 Q≤LQi4, it is considered that condition nine is met;

[0039] Condition 10: When the L1 pipeline is pressurized and L1VH>LVi1, it is considered that condition 10 is met;

[0040] Condition 11: When the L1 pipeline is pressurized and L M+1 VL>LVi2, it is considered that condition 11 is met;

[0041] Condition 12: When the L1 pipeline is depressurized, and L1Q>LQi5, and after Tx time, L1Q≤LQi6, it is considered that condition 12 is met;

[0042] Among them, L M+1 P represents pipeline L M+1 Road pressure; L M+1 T represents pipeline L M+1 The time for the road to meet the requirements of condition 1, 0≤L M+1 T≤60min; L M+1 Q represents pipeline L M+1 L1P represents the pressure of pipeline L1; L1T represents the pressurization time of pipeline L1 that meets the requirements of condition 7, 0≤L1T≤60min; L1Q represents the instantaneous flow of pipeline L1; L1VH represents the cumulative output flow after the pipeline starts to be pressurized; L1VL represents the cumulative return flow of the return liquid pipeline after the pipeline starts to be pressurized; Td represents the pressure step, L M+1 P.L M+1 Q, L1Q, L M+1 After VH, L1VL meet the specified conditions 1 to 5 and conditions 7 to 11, the waiting time for data change is 0≤Td≤30min; Tx represents the pressure relief step, L M+1Q is the time to wait for data changes after the specified conditions six and twelve are met, 0≤Tx≤30min; Ty is the standard time to wait before the next operation after the pressure step and the pressure relief step meet the specified conditions, 0≤Ty≤30min; LPi is the judgment pressure set in conditions one and seven when executing the i-th action, 0≤LPi≤60MPa; LTi is the judgment pressure time set in conditions one and seven when executing the i-th action, 0≤LTi≤60min; LQi 1 means that when the i-th action is executed and the high-pressure oil inlet pipeline starts the instantaneous flow during the pressure release, 0≤LQi 1≤30ml / s; LQi2 means that when the i-th action is executed and the high-pressure oil inlet pipeline stops the instantaneous flow rate during pressure application, 0≤LQi2≤30ml / s; LQi3 means that when the i-th action is executed and the low-pressure oil return pipeline starts the instantaneous flow rate during pressure application, 0≤LQi3≤30ml / s; LQi4 means that when the i-th action is executed and the low-pressure oil return pipeline stops the instantaneous flow rate during pressure application, 0≤LQi4≤1ml / s; LQi5 means that when the i-th action is executed and the low-pressure oil return pipeline stops the instantaneous flow rate during pressure release, 0≤LQi1≤1ml / s; LVi 1 means that when the i-th action is executed, the theoretical oil inlet volume of the high-pressure oil inlet pipeline is executed, and its value is determined by the piston volume when the hydraulic control flow valve executes the i-th action, 50≤LVi 1≤1000ml; LVi2 represents the theoretical return oil volume of the low-pressure return oil pipeline when executing the i-th action. Its value is determined by the piston volume when the hydraulic control flow valve executes the i-th action, 0≤LVi2≤1000ml.

[0043] The beneficial effects of the present invention are that it can accurately adjust the downhole flow rate and quickly respond to changes in downhole conditions, which is crucial to ensuring the continuity and efficiency of oil and gas extraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 The figure is a schematic diagram of a hydraulically controlled downhole flow controller of the present invention.

[0045] Figure 2 This is a diagram showing the opening variation of the downhole flow controller in the present invention.

[0046] Figure 3 A flow chart is added for the opening of the downhole flow controller in the present invention.

[0047] Figure 4 It is a cross-sectional view of the downhole flow controller in the present invention. DETAILED DESCRIPTION

[0048] The invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement it according to the description.

[0049] It should be understood that terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or other elements or combinations thereof.

[0050] like Figure 1-4 As shown, an automatic control method 1 of a hydraulically controlled downhole flow controller of the present invention comprises:

[0051] The Nth downhole flow controllers 100 are arranged on the downhole production string in order from top to bottom;

[0052] Ground controller 200, which is connected to the ground through L1 hydraulic line and L M+1 The hydraulic pipeline drives the Mth downhole flow controller 100; the surface controller measures the flow from the L1 hydraulic pipeline to the L M+1 Pressure and flow data of hydraulic pipelines;

[0053] Among them, the L1 hydraulic pipeline to L M+1 The hydraulic pipeline is connected from the downhole flow controller located in the downhole production string to the surface controller at the wellhead; M+1 Solenoid valves 210 are respectively provided on the hydraulic pipelines; when the solenoid valve 210 on one of the two hydraulic pipelines connected to the same downhole flow controller 100 is opened, the solenoid valve 210 on the other hydraulic pipeline is closed, forming an interlock; N is a natural number greater than or equal to 2; M=1, 2, ..., N.

[0054] In another embodiment, the downhole flow controller 100 comprises:

[0055] An outer sleeve 110, wherein an annular groove 111 is provided on the inner circumference of the upper portion;

[0056] The central shaft 120 is axially movably arranged in the outer sleeve, and an enlarged portion 121 is provided on the outer periphery of the middle and upper part of the central shaft; the outer periphery of the central shaft on both sides of the annular groove is sealed and connected with the inner periphery of the outer sleeve 111; a first piston cavity 131 and a second piston cavity 132 are formed between the two sides of the enlarged portion 121 and the annular groove 111; the outer periphery of the enlarged portion 121 is sealed and matched with the inner wall of the annular groove 111;

[0057] The inner ends of the first interface 112 and the second interface 113 are connected to the first piston chamber 131 and the second piston chamber 132 respectively, and the outer ends of the first interface 112 and the second interface 113 are connected to the L1 hydraulic pipeline and the L2 hydraulic pipeline respectively. M+1 Hydraulic line connections;

[0058] The outer sleeve hole 114 and the central shaft hole 122 are radially arranged at the lower part of the outer sleeve 110 and the central shaft 120, respectively. By pressing into the first piston chamber 131 or the second piston chamber 132, the overlap between the outer sleeve hole 114 and the central shaft hole 122 is controlled to adjust the opening of the downhole flow controller 100. As a preferred embodiment, the outer periphery of the central shaft 120 on both sides of the annular groove 111 and the inner periphery of the outer sleeve 111 are sealed and connected through the first sealing ring 141; the outer periphery of the enlarged part 121 and the inner wall of the annular groove 111 are sealed and matched through the second sealing ring 142.

[0059] In another embodiment, the central axis hole 122 is composed of 7 through holes arranged in sequence; the downhole flow controller 100 is provided with 8 openings, and the 8 openings are represented by numbers 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7, respectively, and n represents the current opening; the ground controller 200 controls the opening size of the downhole flow controller 100 by pressure.

[0060] In another embodiment, it also includes:

[0061] A sensor disposed in the ground controller 200;

[0062] The host computer has a detector disposed therein, and the host computer is connected to the sensor in electronic communication. When the detector detects that the communication is momentarily interrupted, the host computer issues an instruction to the ground controller, and the ground controller re-collects and verifies the signal, and performs subsequent operations after confirming that it is correct.

[0063] Example

[0064] A control method for a hydraulically controlled downhole flow control device as described in any one of the above, comprising the following steps:

[0065] S1, respectively setting N downhole flow controllers 100 on downhole production strings;

[0066] S2, ground controller 200 outputs L1 hydraulic pipeline to L M+1 Hydraulic lines;

[0067] S3, ground controller 200 through L1 hydraulic pipeline and L M+1 The hydraulic pipeline drives the Mth downhole flow controller 100;

[0068] Among them, the L1 hydraulic pipeline to L M+1Solenoid valves 210 are respectively provided on the hydraulic pipelines; when the solenoid valve 210 on one of the two hydraulic pipelines connected to the same downhole flow controller 100 is opened, the solenoid valve 210 on the other hydraulic pipeline is closed, forming an interlock; N is a natural number greater than or equal to 2; M=1, 2, ..., N.

[0069] The pressure-increasing action of the downhole flow controller includes a pressure-increasing step and a pressure-releasing step. The pressure-increasing step is completed first, and then the pressure-releasing step is completed. When both steps are completed, the pressure-increasing action is considered to be completed.

[0070] When L M+1 After the hydraulic pipeline starts the pressurization operation, when conditions 1 to 5 are met at the same time and the waiting time is delayed for Ty, the pressurization step is considered to be completed; L M+1 After the hydraulic pipeline starts the pressure relief operation, when condition six is ​​met and the waiting time is delayed for Ty, the pressure relief step is considered to be completed;

[0071] After the L1 hydraulic pipeline starts the pressure-injection operation, when conditions seven to eleven are met at the same time, and after the delay waiting time Ty, the pressure-injection step is considered to be completed; after the L1 hydraulic pipeline starts the pressure-relieving operation, when condition twelve is met, and after the delay waiting time Ty, the pressure-relieving step is considered to be completed;

[0072] The determination conditions one to twelve are as follows:

[0073] Condition 1: When L M+1 The pipeline is pressurized, and L M+1 P>LPi, and L M+1 T>L M+1 When Ti, it is considered that condition 1 is met;

[0074] Condition 2: When L M+1 The pipeline is pressurized, and L M+1 Q>LQi1, and after Td time, L M+1 Q≤LQi2, it is considered that condition 2 is met;

[0075] Condition 3: When L M+1 The pipeline is pressurized, and L1Q>LQi3, and after Td time, L1Q≤LQi4, it is considered that condition three is met;

[0076] Condition 4: When L M+1 The pipeline is pressurized, and L M+1 VH>LVi 1, it is considered that condition 4 is met;

[0077] Condition 5: When L M+1 The pipeline is pressurized, and L1VL>LVi2, which is considered to meet condition five;

[0078] Condition 6: When L M+1 The pipeline is depressurized, and LM+1 Q>LQi5, and after Tx time, L M+1 Q≤LQi6, it is considered that condition six is ​​met;

[0079] Condition 7: When the L1 pipeline is pressurized, and L1P>LPi, and L1T>L1Ti, it is considered that condition 7 is met;

[0080] Condition 8: When the L1 pipeline is pressurized, and L1Q>LQi1, and after Td time, L1Q≤LQi2, it is considered that condition 8 is met;

[0081] Condition 9: When the L1 pipeline is pressurized and L M+1 Q>LQi3, and after Td time, L M+1 Q≤LQi4, it is considered that condition nine is met;

[0082] Condition 10: When the L1 pipeline is pressurized and L1VH>LVi1, it is considered that condition 10 is met;

[0083] Condition 11: When the L1 pipeline is pressurized and L M+1 VL>LVi2, it is considered that condition 11 is met;

[0084] Condition 12: When the L1 pipeline is depressurized, and L1Q>LQi5, and after Tx time, L1Q≤LQi6, it is considered that condition 12 is met;

[0085] Among them, L M+1 P represents pipeline L M+1 Road pressure; L M+1 T represents pipeline L M+1 The time for the road to meet the requirements of condition 1, 0≤L M+1 T≤60min; L M+1 Q represents pipeline L M+1 L1P represents the pressure of pipeline L1; L1T represents the pressurization time of pipeline L1 that meets the requirements of condition 7, 0≤L1T≤60min; L1Q represents the instantaneous flow of pipeline L1; L1VH represents the cumulative output flow after the pipeline starts to be pressurized; L1VL represents the cumulative return flow of the return liquid pipeline after the pipeline starts to be pressurized; Td represents the pressure step, L M+1 P.L M+1 Q, L1Q, L M+1 After VH, L1VL meet the specified conditions 1 to 5 and conditions 7 to 11, the waiting time for data change is 0≤Td≤30min; Tx represents the pressure relief step, L M+1Q is the time to wait for data changes after the specified conditions six and twelve are met, 0≤Tx≤30min; Ty is the standard time to wait before the next operation after the pressure step and the pressure relief step meet the specified conditions, 0≤Ty≤30min; LPi is the judgment pressure set in conditions one and seven when executing the i-th action, 0≤LPi≤60MPa; LTi is the judgment pressure time set in conditions one and seven when executing the i-th action, 0≤LTi≤60min; LQi 1 means that when the i-th action is executed and the high-pressure oil inlet pipeline starts the instantaneous flow during the pressure release, 0≤LQi 1≤30ml / s; LQi2 means that when the i-th action is executed and the high-pressure oil inlet pipeline stops the instantaneous flow rate during pressure application, 0≤LQi2≤30ml / s; LQi3 means that when the i-th action is executed and the low-pressure oil return pipeline starts the instantaneous flow rate during pressure application, 0≤LQi3≤30ml / s; LQi4 means that when the i-th action is executed and the low-pressure oil return pipeline stops the instantaneous flow rate during pressure application, 0≤LQi4≤1ml / s; LQi5 means that when the i-th action is executed and the low-pressure oil return pipeline stops the instantaneous flow rate during pressure release, 0≤LQi1≤1ml / s; LVi 1 means that when the i-th action is executed, the theoretical oil inlet volume of the high-pressure oil inlet pipeline is executed, and its value is determined by the piston volume when the hydraulic control flow valve executes the i-th action, 50≤LVi 1≤1000ml; LVi2 represents the theoretical return oil volume of the low-pressure return oil pipeline when executing the i-th action. Its value is determined by the piston volume when the hydraulic control flow valve executes the i-th action, 0≤LVi2≤1000ml.

[0086] The beneficial effects of the present invention are that it can accurately adjust the downhole flow rate and quickly respond to changes in downhole conditions, which is crucial to ensuring the continuity and efficiency of oil and gas extraction.

[0087] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A hydraulically controlled downhole flow control device, characterized in that: include: The Nth downhole flow controllers are arranged on the downhole production string in order from top to bottom; Ground controls, which are connected via L1 hydraulic line and L M+1 The hydraulic pipeline drives the Mth downhole flow controller; the surface controller measures the flow from L1 hydraulic pipeline to L M+1 Pressure and flow data of hydraulic pipelines; Among them, the L1 hydraulic pipeline to L M+1 The hydraulic pipeline is connected from the downhole flow controller located in the downhole production string to the surface controller at the wellhead; M+1 Solenoid valves are respectively provided on the hydraulic pipelines; when the solenoid valve on one of the two hydraulic pipelines connected to the same downhole flow controller is opened, the solenoid valve on the other hydraulic pipeline is closed, forming an interlock; N is a natural number greater than or equal to 2; M=1, 2, ..., N.

2. The hydraulically controlled downhole flow control device according to claim 1, characterized in that: The downhole flow controller comprises: An outer sleeve, wherein an annular groove is provided on the inner circumference of the upper portion; The central shaft is axially movably arranged in the outer sleeve, and an enlarged portion is provided on the outer periphery of the upper middle portion of the central shaft; the outer periphery of the central shaft on both sides of the annular groove is sealed and connected with the inner periphery of the outer sleeve; a first piston cavity and a second piston cavity are formed between the two sides of the enlarged portion and the annular groove; the outer periphery of the enlarged portion is sealed and matched with the inner wall of the annular groove; The inner ends of the first interface and the second interface are connected to the first piston chamber and the second piston chamber respectively, and the outer ends of the first interface and the second interface are connected to the L1 hydraulic pipeline and the L2 hydraulic pipeline respectively. M+1 Hydraulic line connections; The outer sleeve hole and the central axis hole are radially arranged at the lower part of the outer sleeve and the central axis respectively. By pressing the first piston cavity or the second piston cavity, the overlap between the outer sleeve hole and the central axis hole is controlled to adjust the opening of the downhole flow controller.

3. The hydraulically controlled downhole flow control device according to claim 2, characterized in that: The central axis hole is composed of 7 through holes arranged in sequence; the downhole flow controller is provided with 8 openings, and the 8 openings are represented by the numbers 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7, and n represents the current opening; the ground controller controls the opening size of the downhole flow controller by pressure.

4. The hydraulically controlled downhole flow control device according to claim 1, characterized in that: Also includes: a sensor disposed in a ground controller; The host computer has a detector disposed therein, and the host computer is connected to the sensor in electronic communication. When the detector detects that the communication is momentarily interrupted, the host computer issues an instruction to the ground controller, and the ground controller re-collects and verifies the signal, and performs subsequent operations after confirming that it is correct.

5. A control method for a hydraulically controlled downhole flow control device according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, respectively setting N downhole flow controllers on the downhole production string; S2, ground controller output L1 hydraulic pipeline to L M+1 Hydraulic lines; S3, ground controller through L1 hydraulic pipeline and L M+1 The hydraulic pipeline drives the Mth downhole flow controller; Among them, in the L1 hydraulic pipeline to L M+1 Solenoid valves are respectively provided on the hydraulic pipelines; when the solenoid valve on one of the two hydraulic pipelines connected to the same downhole flow controller is opened, the solenoid valve on the other hydraulic pipeline is closed, forming an interlock; N is a natural number greater than or equal to 2; M=1, 2, ..., N.

6. The control method of the hydraulically controlled downhole flow control device according to claim 5, characterized in that: The pressure-increasing action of the downhole flow controller includes a pressure-increasing step and a pressure-releasing step. The pressure-increasing step is completed first, and then the pressure-releasing step is completed. When both steps are completed, the pressure-increasing action is considered to be completed.

7. The control method of the hydraulically controlled downhole flow control device according to claim 4, characterized in that: When L M+1 After the hydraulic pipeline starts the pressurization operation, when conditions 1 to 5 are met at the same time and the waiting time is delayed for Ty, the pressurization step is considered to be completed; L M+1 After the hydraulic pipeline starts the pressure relief operation, when condition six is ​​met and the waiting time is delayed for Ty, the pressure relief step is considered to be completed; After the L1 hydraulic pipeline starts the pressure-injection operation, when conditions seven to eleven are met at the same time, and after the delay waiting time Ty, the pressure-injection step is considered to be completed; after the L1 hydraulic pipeline starts the pressure-relieving operation, when condition twelve is met, and after the delay waiting time Ty, the pressure-relieving step is considered to be completed; The determination conditions one to twelve are as follows: Condition 1: When L M+1 The pipeline is pressurized, and L M+1 P>LPi, and L M+1 T>L M+1 When Ti, it is considered that condition 1 is met; Condition 2: When L M+1 The pipeline is pressurized, and L M+1 Q>LQi1, and after Td time, L M+1 Q≤LQi2, it is considered that condition 2 is met; Condition 3: When L M+1 The pipeline is pressurized, and L1Q>LQi3, and after Td time, L1Q≤LQi4, it is considered that condition three is met; Condition 4: When L M+1 The pipeline is pressurized, and L M+1 VH>LVi 1, it is considered that condition 4 is met; Condition 5: When L M+1 The pipeline is pressurized, and L1VL>LVi2, which is considered to meet condition five; Condition 6: When L M+1 The pipeline is depressurized, and L M+1 Q>LQi5, and after Tx time, L M+1 Q≤LQi6, it is considered that condition six is ​​met; Condition 7: When the L1 pipeline is pressurized, and L1P>LPi, and L1T>L1Ti, it is considered that condition 7 is met; Condition 8: When the L1 pipeline is pressurized, and L1Q>LQi1, and after Td time, L1Q≤LQi2, it is considered that condition 8 is met; Condition 9: When the L1 pipeline is pressurized and L M+1 Q>LQi3, and after Td time, L M+1 Q≤LQi4, it is considered that condition nine is met; Condition 10: When the L1 pipeline is pressurized and L1VH>LVi1, it is considered that condition 10 is met; Condition 11: When the L1 pipeline is pressurized and L M+1 VL>LVi2, it is considered that condition 11 is met; Condition 12: When the L1 pipeline is depressurized, and L1Q>LQi5, and after Tx time, L1Q≤LQi6, it is considered that condition 12 is met; Among them, L M+1 P represents pipeline L M+1 Road pressure; L M+1 T represents pipeline L M+1 The time for the road to meet the requirements of condition 1, 0≤L M+1 T≤60min; L M+1 Q represents pipeline L M+1 L1P represents the pressure of pipeline L1; L1T represents the pressurization time of pipeline L1 that meets the requirements of condition 7, 0≤L1T≤60min; L1Q represents the instantaneous flow of pipeline L1; L1VH represents the cumulative output flow after the pipeline starts to be pressurized; L1VL represents the cumulative return flow of the return liquid pipeline after the pipeline starts to be pressurized; Td represents the pressure step, L M+1 P.L M+1 Q, L1Q, L M+1 After VH, L1VL meet the specified conditions 1 to 5 and conditions 7 to 11, the waiting time for data change is 0≤Td≤30min; Tx represents the pressure relief step, L M+1 Q is the time to wait for data changes after the specified conditions six and twelve are met, 0≤Tx≤30min; Ty is the standard time to wait before the next operation after the pressure step and the pressure relief step meet the specified conditions, 0≤Ty≤30min; LPi is the judgment pressure set in conditions one and seven when executing the i-th action, 0≤LPi≤60MPa; LTi is the judgment pressure time set in conditions one and seven when executing the i-th action, 0≤LTi≤60min; LQi 1 means that when the i-th action is executed and the high-pressure oil inlet pipeline starts the instantaneous flow during the pressure release, 0≤LQi 1≤30ml / s; LQi2 means that when the i-th action is executed and the high-pressure oil inlet pipeline stops the instantaneous flow during pressure application, 0≤LQi2≤30ml / s; LQi3 means that when the i-th action is executed and the low-pressure oil return pipeline starts the instantaneous flow during pressure application, 0≤LQi3≤30ml / s; LQi4 means that when the i-th action is executed and the low-pressure oil return pipeline stops the instantaneous flow during pressure application, 0≤LQi4≤1ml / s; LQi5 means that when the i-th action is executed and the low-pressure oil return pipeline stops the instantaneous flow during pressure release, 0≤LQi 1≤1ml / s; LVi 1 represents the theoretical oil inlet volume of the high-pressure oil inlet pipeline when executing the i-th action. Its value is determined by the piston volume when the hydraulic control flow valve executes the i-th action, 50≤LVi 1≤1000ml; LVi2 represents the theoretical oil return volume of the low-pressure oil return pipeline when executing the i-th action. Its value is determined by the piston volume when the hydraulic control flow valve executes the i-th action, 0≤LVi2≤1000 ml.

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