An intelligent downhole layered well testing injector and automatic flow control and testing system

Abstract

The present invention discloses an intelligent downhole stratified well test injector and automatic flow control and testing system, belonging to the technical field of oilfield water injection development. The water inlet of an automatic water nozzle is connected with a flow pipe, one end of a water outlet of the automatic water nozzle extends into an upper joint and is connected with the outside of the upper joint through the upper joint, a flow meter is arranged between the water inlet and the water outlet; the upper joint is connected with a well test nipple for monitoring and obtaining the external pressure of the upper joint and calculating the flow required for the water nozzle; the lower joint is connected with a control storage module and a battery unit for obtaining the data of the well test nipple and controlling the opening of the automatic water nozzle, and the control storage module is electrically connected with the battery unit, the flow meter, the well test nipple and the automatic water nozzle respectively.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield water injection development, and in particular to an intelligent downhole stratified well testing injector and a flow automatic control and testing system. Background Art

[0002] Domestic oil fields mostly adopt water injection development, and consider water injection development as the most economical and effective technical means. At present, most oil fields adopt mechanical stratified water injection technology such as bridge eccentric and bridge concentric. This method is highly dependent on personnel, and the whole process requires long-term manual operation. The stratified flow control mostly adopts water injection dynamics and experience analysis to give stratified flow indicators, and complete stratified flow control through manual operation.

[0003] At present, the operation of water injection wells generally involves three stages: testing, regulation, and water injection. During the testing process, it is necessary to lower test tools to obtain test data, formulate regulation plans based on the test data, and transmit the regulation plans from the ground to the well. Testing and regulation instruments must be lowered to the well. When officially injecting water, the water injection volume of the entire well can only be controlled by relying on the ground control system.

[0004] In the process of implementing the embodiments of the present invention, the inventors found that the background technology has at least the following defects:

[0005] The existing technology requires that different instruments be lowered into the well at different stages, and the instruments must be manually lowered and lowered for underground operations at each stage in order to achieve testing and control, which wastes manpower, material resources and time. In addition, the layered dynamic data cannot be monitored in real time, which results in complex manual lowering and lifting work at each stage, which is labor-intensive, time-consuming and costly. Summary of the invention

[0006] The present invention provides an intelligent downhole stratified well test injector and flow automatic control and testing system, the purpose of which is to reduce the workload at each stage of stratified water injection, reduce the multiple steps of raising and lowering the instrument, realize real-time monitoring of stratified dynamic data, save manpower, material resources and time costs, and shorten the process of stratified water injection control.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0008] An intelligent downhole stratified well testing injector comprises a working cylinder, a flow tube sleeved in the working cylinder, and an upper joint and a lower joint respectively connected to the two ends of the working cylinder, wherein the working cylinder, the flow tube, the upper joint and the lower joint form an annular sealed cavity; a flow meter, an automatic water nozzle, a well testing nipple, a control storage module and a battery unit are arranged in the annular sealed cavity, the water inlet of the automatic water nozzle is connected to the flow tube, one end of the water outlet of the automatic water nozzle extends into the upper joint and is connected to the outside of the upper joint through the upper joint, a flow meter is arranged between the water inlet and the water outlet; the upper joint is connected to the well testing nipple; the lower joint is connected to the battery unit and a control storage module for obtaining the well testing nipple data and controlling the automatic water nozzle, and the control storage module is respectively electrically connected to the battery unit, the flow meter, the well testing nipple and the automatic water nozzle.

[0009] The self-controlled water nozzle also includes a flow control valve, a connecting rod and a flow control cavity between the water inlet and the water outlet, the flow control valve is composed of a valve sleeve and a valve core, the valve sleeve of the flow control valve in the flow control cavity is fixed to the inner wall of the flow control cavity, the valve core of the flow control valve is connected to one end of the connecting rod, the other end of the connecting rod has a ball screw assembly and a driving motor, the connecting rod is coaxially connected to the driving motor through the ball screw assembly, when the driving motor extends the connecting rod through the ball screw assembly, the flow control valve in the flow control cavity opens, and the water inlet and the water outlet are connected; when the driving motor retracts the connecting rod through the ball screw assembly, the flow control valve in the flow control cavity is closed, and the water inlet and the water outlet are closed.

[0010] The ball screw assembly includes a ball screw pair and a guide groove for radial fixation and axial sliding of the nut of the ball screw pair. When the screw of the ball screw pair rotates, the nut of the ball screw pair slides axially along the guide groove; one end of the nut extends to form an inner cavity for the screw to fully penetrate the interior of the nut, one end of the extended nut is connected to a connecting rod, and the other end of the nut is cooperatively connected to the screw; the screw is coaxially connected to the drive motor, the guide groove is parallel to the motor shaft of the drive motor, and the guide groove and the drive motor are relatively fixed.

[0011] The connecting rod, the flow control cavity and the ball screw assembly are provided with a shell outside, and the connecting rod, the flow control cavity and the ball screw assembly are located inside the shell. The water inlet is connected with the flow pipe through the shell, and the water outlet is connected with the water injection oil layer through the shell. The two ends of the flow control valve located in the shell are provided with a first balanced pressure chamber for transmitting the internal pressure to one end of the flow control valve and a second balanced pressure chamber for transmitting the internal pressure to the other end of the flow control valve. The first balanced pressure chamber and the second balanced pressure chamber are connected with the flow pipe.

[0012] The driving motor is a servo motor, which includes a position marker and a control circuit. The control circuit and the position marker constitute a position marker servo control system. The control storage module is electrically connected to the servo motor through the position marker servo control system.

[0013] The position marker is composed of a Hall sensor and a magnetic steel. The position marker is fixed on the upper end of the servo motor and is sleeved inside the shell.

[0014] The upper connector is connected with a wireless communication module for transmitting the data stored in the control storage module, and the wireless communication module is electrically connected to the control storage module.

[0015] A multi-stage layered water injection pipe string comprises an intelligent downhole layered well testing injector.

[0016] An intelligent downhole stratified well test flow automatic control and testing system, which at least includes a multi-stage stratified water injection string;

[0017] A wireless controller, comprising:

[0018] A shell that can penetrate deep into the flow tube, the front end of the shell is connected to the antenna, the rear end of the shell is provided with a cable connector and a positioning claw, and the rear end of the shell is connected to the cable connector through the positioning claw; a main control module, a magnetic positioning short section and a communication module for short-distance communication with a wireless communication module are sealed in the shell, and the main control module is electrically connected to the cable connector, the magnetic positioning short section, the communication module and the positioning claw respectively;

[0019] When the positioning claw used for docking with the diameter reducing portion of the upper joint is opened and passes through the upper joint, the wireless controller is connected with the upper joint through the positioning claw.

[0020] The multi-stage stratified water injection string includes a casing protection packer, an interlayer packer and downhole accessories. The intelligent downhole stratified well testing injector is connected between the casing protection packer and the downhole accessories. Two adjacent intelligent downhole stratified well testing injectors are connected in sequence through the interlayer packer. The oil pipe at the wellhead of the water injection well is connected to the topmost intelligent downhole stratified well testing injector through the casing protection packer. The lower end of the bottom intelligent downhole stratified well testing injector is connected to the downhole accessories. The downhole accessories include a preset working cylinder, a double-acting valve, a screen pipe and a wire plug connected in sequence.

[0021] The beneficial effects of the present invention are that it realizes intelligent control of stratified flow in intelligent oil fields, uses well test interpretation throughout the entire process, the data is objective and reliable, human factors are minimal, and the operation is simple and convenient during dynamic data monitoring and control of water injection. At the same time, it ensures that the water injection in the oil field is stable and scientific, saves manpower, material resources and time, reduces the workload at each stage of stratified water injection, can quickly control the injection volume of stratified water injection, and reduces the starting and stopping cost of stratified water injection.

[0022] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a front view of the internal structure of an intelligent downhole stratified well testing injector according to the present invention.

[0024] Figure 2 This is a rear view of the internal structure of an intelligent downhole layered well testing injector according to the present invention.

[0025] Figure 3 The present invention is a front view cross-sectional structural diagram of an automatic water nozzle in an intelligent downhole stratified well testing injector.

[0026] Figure 4 for Figure 3 A top view of the enlarged cross-sectional structure.

[0027] Figure 5 The figure is an external structural diagram of an automatic water nozzle in an intelligent downhole stratified well testing injector according to the present invention.

[0028] Figure 6 The present invention is a schematic structural diagram of a well testing pup joint in an automatic water nozzle of an intelligent downhole stratified well testing injector.

[0029] Figure 7 The cross-sectional structural diagram of an integrated well testing control and injection tool in an intelligent downhole stratified well testing flow automatic control and testing system of the present invention.

[0030] Figure 8 The present invention is a schematic diagram of the structure of an intelligent downhole stratified well testing flow automatic control and testing system.

[0031] Fig. 9 The present invention is a graph showing the change in pressure over time measured by a well testing sub in an intelligent downhole stratified well testing injector.

[0032] Fig.10 This is a double logarithmic curve data diagram measured by a well testing test sub in an intelligent downhole stratified well testing injector of the present invention.

[0033] The markings in the figure are: 1. upper joint; 2. flow tube; 3. lower joint; 4. wireless communication module; 5. well test short section; 6. automatic water nozzle; 7. battery unit; 8. control storage module; 9. flow meter; 10. cable joint; 11. positioning claw; 12. magnetic positioning short section; 13. shell; 14. main control module; 15. communication module; 16. antenna; 17. casing protection packer; 18. an intelligent downhole layered well test injector; 19. interlayer packer; 20. second balance pressure chamber; 21. first balance pressure chamber; 22. drive motor; 23. valve sleeve; 24. valve core; 25. ball screw assembly; 26. connecting rod; 27. Hall sensor; 28. magnet; 29. ​​water inlet; 30. water outlet; 31. working cylinder. DETAILED DESCRIPTION

[0034] Example 1

[0035] An intelligent downhole stratified well test injector comprises a working cylinder 31, a flow tube 2 sleeved in the working cylinder 31, and an upper joint 1 and a lower joint 3 respectively connected to the two ends of the working cylinder 31, wherein the working cylinder 31, the flow tube 2, the upper joint 1 and the lower joint 3 form an annular sealed cavity; a flow meter 9, an automatic water nozzle 6, a well test short section 5, a control storage module 8 and a battery unit 7 are arranged in the annular sealed cavity, a water inlet 29 of the automatic water nozzle 6 is connected to the flow tube 2, one end of the water outlet 30 of the automatic water nozzle 6 extends into the upper joint 1 and is connected to the outside of the upper joint 1 through the upper joint 1, a flow meter 9 is arranged between the water inlet 29 and the water outlet 30; the upper joint 1 is connected to the well test short section 5; the lower joint 3 is connected to the battery unit 7 and a control storage module 8 for obtaining the data of the well test short section 5 and controlling the automatic water nozzle 6, and the control storage module 8 is electrically connected to the battery unit 7, the flow meter 9, the well test short section 5 and the automatic water nozzle 6 respectively.

[0036] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, the present invention is an intelligent downhole stratified well testing injector, the operating environment of which is the oil field layer environment downhole in the oil field, which is a relatively harsh environment. Its structure includes a working cylinder 31, a flow tube 2 sleeved in the working cylinder 31, and an upper joint 1 and a lower joint 3 respectively connected to the two ends of the working cylinder 31. The working cylinder 31, the flow tube 2, the upper joint 1 and the lower joint 3 form an annular sealing cavity, wherein the annular sealing cavity is a sealed cavity, which can isolate the flow tube 2 and the oil field downhole, the working cylinder 31 and the upper joint 1 and the lower joint 3 from external water, thereby realizing waterproof and oil-proof sealing of each component in the annular sealing cavity.

[0037] In the annular sealed cavity, a flow meter 9, an automatic water nozzle 6, a well test short section 5, a control storage module 8 and a battery unit 7 are fixed on the upper joint 1 or the lower joint 3. The automatic water nozzle is powered by the battery unit 7 through the control storage module 8. The automatic water nozzle 6 controls its water nozzle opening through the control storage module 8 to adjust the water flow between the water inlet 29 and the water outlet 30. The water flow between the water inlet 29 and the water outlet 30 is tested by the flow meter 9, and the flow meter 9 sends the test result to the control storage module 8 for storage and providing a basis for the opening of the automatic water nozzle 6; a high-precision pressure gauge 33 and a control module 34 are integrated in the well test short section 5. The control module 34 is responsible for control, storage and analysis. The high-precision pressure gauge 33 tests the stratified pressure and the pressure in the flow pipe 2, which is used for the later well test interpretation analysis and obtaining the pressure wave code information in the flow pipe 2, and the corresponding parameters and wave code instructions are obtained, such as Figure 6 , Fig. 9 As shown. The well test sub 5 is connected to the control storage module 8. After the well test sub 5 monitors the oil well layer pressure data and stores it, the control storage module 8 obtains the pressure data for analysis, and calculates the required water output of the automatic water nozzle 6 in combination with the flow meter 9, and controls the opening of the water nozzle; when the opening of the water nozzle increases or decreases, the data obtained by the flow meter 9 and the well test sub 5 change dynamically, and the control storage module 8 continuously controls the opening change of the automatic water nozzle 6, and performs dynamic adjustment in combination with the dynamic data obtained by the flow meter 9 and the well test sub 5, until the water output of the automatic water nozzle 6 reaches the standard water injection volume. The water inlet 29 of the automatic water nozzle 6 is connected to the flow pipe 2, and the water outlet 30 of the automatic water nozzle 6 is connected to the outside of an intelligent downhole stratified well test injector, and is connected to the oil layer of the oil well for water injection.

[0038] The automatic water nozzle 6 also has the function of transmitting pressure wave codes. The flow tube 2 provides a stable water supply pressure for the automatic water nozzle 6. The automatic water nozzle 6 itself has the function of adjusting the water flow rate of the water outlet. The automatic water nozzle 6 can quickly control the opening and closing of the water flow rate of the water outlet. The rapid opening and closing of the outlet causes the stable water pressure in the flow tube 2 to produce instantaneous changes. The constantly changing instantaneous pressure sends the information to be sent by the automatic water nozzle 6 along the flow tube 2 to the ground receiving end in the form of pressure wave codes.

[0039] In this embodiment, an intelligent downhole stratified well testing injector of the present invention is responsible for the injection of downhole oil fields. The control console located on the well for controlling the present invention is arranged on the ground. It provides a stable water supply pressure to the flow pipe 2 through a pipeline through a water injection pressure stabilizing system, so that the intelligent downhole stratified well testing injector of the present invention can stably inject water. The command sending and receiving system of the ground control console is composed of an electric control valve, a high-precision pressure detector and a computer control software. When the control console provides a stable water supply pressure to the flow pipe 2, the computer control software sends a switch command to control the electric control valve to perform a rapid switch action, and an instantaneous pressure change occurs in the flow pipe 2, thereby establishing a wave code.

[0040] Example 2

[0041] On the basis of Example 1, the automatic water nozzle 6 also includes a flow control valve, a connecting rod 26 and a flow control cavity between the water inlet 29 and the water outlet 30, the flow control valve is composed of a valve sleeve 23 and a valve core 24, the valve sleeve 23 of the flow control valve in the flow control cavity is fixed to the inner wall of the flow control cavity, the valve core 24 of the flow control valve is connected to one end of the connecting rod 26, the other end of the connecting rod 26 has a ball screw assembly 25 and a drive motor 22, the connecting rod 26 is coaxially connected to the drive motor 22 through the ball screw assembly 25, when the drive motor 22 extends the connecting rod 26 through the ball screw assembly 25, the flow control valve in the flow control cavity is opened, and the water inlet 29 and the water outlet 30 are connected; when the drive motor 22 retracts the connecting rod 26 through the ball screw assembly 25, the flow control valve in the flow control cavity is closed, and the water inlet 29 and the water outlet 30 are closed.

[0042] In this embodiment, if Figure 3 , Figure 5 As shown, the automatic water nozzle 6 has a flow control cavity inside, and the flow control cavity has a water inlet 29 and a water outlet 30. Between the water inlet 29 and the water outlet 30 in the flow control cavity, a flow control valve, a connecting rod 26, a ball screw assembly 25 and a drive motor 22 form a mechanism for controlling the water flow between the water inlet 29 and the water outlet 30.

[0043] The water inlet 29 and the water outlet 30 are mainly controlled by a flow-limiting flow control valve. The valve sleeve 23 of the flow control valve is fixed on the inner wall of the flow control cavity. The water outlet hole of the valve sleeve 23 is connected with the water outlet 30. The valve core 24 cooperates with the valve sleeve 23. The valve core 24 is connected with the water inlet 29 and can move relative to the valve sleeve 23 to control the water flow between the valve sleeve 23 and the valve core 24, thereby controlling the water flow between the water inlet 29 and the water outlet 30.

[0044] The relative movement of the valve core 24 is driven by the connecting rod 26 fixed thereto. The power of the connecting rod 26 comes from the precision power system composed of the ball screw assembly 25 and the drive motor 22. The drive motor 22 provides rotational power, and the ball screw assembly 25 converts the rotational power into sliding power along the axial direction of the motor shaft; the flow control valve can be an ordinary miniaturized valve, a ceramic valve, a steel valve, a plastic valve, etc.

[0045] The data that the well test sub 5 can test and store include: Fig.10 Double logarithmic curve: dp and dp'[MPa]-dt[hr]35, such as Fig. 9 Pressure [MPa]: Time [hr] 32.

[0046] Example 3

[0047] On the basis of Example 2, the ball screw assembly 25 includes a ball screw pair and a guide groove 36 for radial fixation and axial sliding of the nut of the ball screw pair. When the screw of the ball screw pair rotates, the nut of the ball screw pair slides axially along the guide groove 36; one end of the nut extends to form an inner cavity for the screw to fully penetrate the interior of the nut, one end of the nut is connected to the connecting rod 26, and the other end of the nut is connected to the screw; the screw is coaxially connected to the drive motor 22, the guide groove 36 is parallel to the motor shaft of the drive motor 22, and the guide groove 36 and the drive motor 22 are relatively fixed.

[0048] In this embodiment, if Figure 3 , Figure 4 As shown, the ball screw assembly 25 is a set that converts the rotational power of the motor into a refined linear motion that advances and retracts along the axial direction of the motor shaft. The ball screw assembly 25 includes a ball screw pair and an axially sliding guide groove 36. In this embodiment, the lead screw of the ball screw pair and the motor shaft of the drive motor 22 are coaxially connected, and the nut of the ball screw pair is driven to advance and retreat by the rotation of the lead screw.

[0049] In the prior art, a nut is matched with a guide rail, the nut and the lead screw are coaxial with the motor shaft, the nut slides forward and backward along the guide rail, and the nut generates forward and backward power along the guide rail. In this embodiment, considering the miniaturization of the automatic water nozzle 6, while the nut is matched with the lead screw, one end of the nut extends to form a cavity, and the lead screw can extend into the cavity. This design can save the length of the lead screw and reduce the radius length of the automatic water nozzle 6.

[0050] Example 4

[0051] On the basis of Example 3, the connecting rod 26, the flow control cavity and the ball screw assembly 25 have an outer shell, and the connecting rod 26, the flow control cavity and the ball screw assembly 25 are located inside the shell, the water inlet 29 is connected to the flow pipe 2 through the shell, and the water outlet 30 is connected to the water injection oil layer through the shell, and the first balanced pressure chamber 21 for transmitting the internal pressure to one end of the flow control valve and the second balanced pressure chamber 20 for transmitting the internal pressure to the other end of the flow control valve are provided at both ends of the flow control valve located in the shell, and the first balanced pressure chamber 21 and the second balanced pressure chamber 20 are connected to the flow pipe 2.

[0052] In this embodiment, if Figure 3 As shown, the automatic water nozzle 6 is arranged in the annular sealed cavity, so the shell is to seal the water entering the automatic water nozzle 6, prevent water from entering the annular sealed cavity, and ensure the safety of each component in each annular sealed cavity. After the shell seals the automatic water nozzle 6, there is a pressure difference between the water inlet 29 and the water outlet 30, and, in the microstructure of the present invention, the fluid viscosity of water will also produce a large resistance; so the flow control valve in the flow control cavity is opened or closed due to the pressure difference, and there will be a large resistance when opening or closing, and it will be difficult for the motor to adjust the closed flow control valve. In this embodiment, a first balanced pressure chamber 21 and a second balanced pressure chamber 20 are provided. The pressure difference and the viscosity of the water flow are balanced by arranging the first balanced pressure chamber 21 and the second balanced pressure chamber 20 at both ends of the flow control valve. Since the first balanced pressure chamber 21 and the second balanced pressure chamber 20 are both connected to the flow control channel 2, the pressures at both ends of the flow control valve are offset, and the resistance of the water flow due to viscosity is also greatly reduced, so that the resistance of the flow control valve in the opening or closing stage is greatly increased, and the sensitivity of the automatic water nozzle 6 is increased.

[0053] Example 5

[0054] Based on Example 4, the drive motor 22 is a servo motor, which includes a position marker and a control circuit. The control circuit and the position marker constitute a position marker servo control system. The control storage module 8 is electrically connected to the servo motor through the position marker servo control system.

[0055] The position marker is composed of a Hall sensor 27 and a magnetic steel 28. The position marker is fixed on the upper end of the servo motor and is sleeved inside the housing.

[0056] In this embodiment, as described in the document "Design of High-Performance Position Marker Servo Control System", published in the paper "Nanjing University of Science and Technology", the author is Jian Jun, and the instructors are Qian Weixian and Tang Hongjie; the author's unit is Guizhou Aerospace Electronics Technology Co., Ltd.; the high-performance position marker servo control system and the servo motor precision structure are introduced in detail. This embodiment adopts a high-performance position marker servo control system to accurately control and monitor the servo motor, providing a basis for accurately controlling the water nozzle opening.

[0057] Example 6

[0058] On the basis of Example 1, the upper connector 1 is connected to a wireless communication module 4 for transmitting data stored in the control storage module 8 , and the wireless communication module 4 is electrically connected to the control storage module 8 .

[0059] On the basis of Example 1, the upper connector 1 is connected to a wireless communication module 4 for transmitting data stored in the control storage module 8, and the wireless communication module 4 is electrically connected to the control storage module 8 to form an intelligent downhole stratified well testing injector for a multi-level stratified water injection string.

[0060] An intelligent downhole stratified well test flow automatic control and testing system includes: it at least includes a multi-stage stratified water injection pipe string; a wireless controller, the wireless controller includes: a shell 13 that can be deeply inserted into a flow pipe 2, the front end of the shell 13 is connected to an antenna 16, the rear of the shell 13 is provided with a cable connector 10 and a positioning claw 11, and the rear of the shell 13 is connected to the cable connector 10 through the positioning claw 11; a main control module 14, a magnetic positioning short section 12 and a communication module 15 for short-distance communication with a wireless communication module 4 are sealed in the shell 13, and the main control module 14 is electrically connected to the cable connector 10, the magnetic positioning short section 12, the communication module 15 and the positioning claw 11 respectively; when the positioning claw 11 used for docking with the diameter reducing part of the upper joint 1 is opened and passes through the upper joint 1, the wireless controller is connected to the upper joint 1 through the positioning claw 11.

[0061] In this embodiment, Figure 7 , Figure 8 As shown, the existing intelligent water injector of the multi-stage stratified water injection string adopts an intelligent downhole stratified well testing injector of the present invention. In addition to sending pressure wave codes through the automatic water nozzle 6, the intelligent downhole stratified well testing injector also integrates a wireless communication module 4, which is a short-range electromagnetic communication module.

[0062] In the multi-level stratified water injection string, an intelligent downhole stratified well testing injector in the present invention can also be controlled by a wireless controller, and cooperate with the wireless communication module 4 to perform short-distance electromagnetic communication. Control instructions and internal data of an intelligent downhole stratified well testing injector can be transmitted through short-distance electromagnetic communication. The fixed injection pressure data of the internal layers of the intelligent downhole stratified well testing injector in the present invention can also be modified to realize the collection of stratified dynamic data testing and stratified flow measurement and adjustment.

[0063] The structure of the wireless controller is composed of a shell 13, an antenna 16, a cable connector 10, and a positioning claw 11. The internal circuit part is composed of a main control module 14, a communication module 15, and a magnetic positioning short section 12. The wireless controller can be lowered into the multi-level layered water injection pipe string underground, and lowered into the position of an intelligent underground layered well test injector through a pipeline and a flow pipe to achieve cooperation with an intelligent underground layered well test injector. The wireless controller obtains the information stored in the internal well test short section 5 and the control storage module 8 of the intelligent underground layered well test injector, and the stored information is used for later well test interpretation and analysis.

[0064] The wireless controller accurately reaches the position of an intelligent downhole stratified well test injector in the multi-level stratified water injection string of the present invention. After the magnetic positioning nipple preliminarily determines the position of the water distributor, the wireless controller is lifted up, the positioning claw is opened, and the wireless controller is lowered. The positioning claw and the reducer at the joint of the water distributor are docked and positioned. At the same time, the antenna of the wireless controller establishes wireless communication with the control storage module of the water distributor, thereby recording the water distributor data and meeting the parameter setting requirements.

[0065] Example 7

[0066] On the basis of Example 6, the multi-stage stratified water injection string also has a casing protection packer 17, an interlayer packer 19 and downhole accessories. The intelligent downhole stratified well testing injector 18 is connected between the casing protection packer 17 and the downhole accessories. Two adjacent intelligent downhole stratified well testing injectors 18 are connected in sequence through the interlayer packer 19. The oil pipe at the wellhead of the water injection well is connected to the topmost intelligent downhole stratified well testing injector 18 through the casing protection packer 17. The lower end of the bottommost intelligent downhole stratified well testing injector 18 is connected to the downhole accessories. The downhole accessories include a preset working cylinder, a double-acting valve, a screen pipe and a wire plug connected in sequence.

[0067] In this embodiment, the multi-stage stratified water injection string consists of an oil pipe, an intelligent downhole stratified well testing injector 18, a packer 19, a casing protection packer 17 and downhole accessories. Each of the intelligent downhole stratified well testing injectors 18 is separated by a packer 19. The top of the intelligent downhole stratified well testing injector 18 is connected to the oil pipe at the wellhead by the casing protection packer 17, and the bottom of the intelligent downhole stratified well testing injector 18 is connected to the downhole accessories.

[0068] The principle of an intelligent downhole stratified well testing injector of the present invention is that the flow tube 2 inside it is connected to the surface water pressure stabilizing system, and the surface water pressure stabilizing system provides a stable water supply, wherein the automatic water nozzle 6 can be used to intelligently adjust the opening of the water nozzle, the water nozzle is connected to the downhole oil layer, and the opening of the water nozzle can adjust the water pressure ratio between the flow tube 2 and the downhole oil layer. The larger the opening, the more water will be produced. The automatic water nozzle 6 monitors the water injection amount and the pressure of the oil layer required for the oil layer through the flow meter 9 and the well testing short section 5 inside it, calculates the comprehensive data, compares the ratio of the optimal oil layer set in the well testing short section 5 and the pressure in the flow tube 2, performs intelligent adjustment, and realizes intelligent injection.

[0069] The power components for adjusting the opening of the automatic water nozzle 6 are the ball screw assembly 25 and the drive motor 22, and the valve for adjusting the opening of the automatic water nozzle 6 is a flow control valve.

[0070] The automatic water nozzle 6 can also quickly control the opening and closing of the automatic water nozzle 6 by controlling the storage module 8, which can act on the water source with stable pressure in the flow pipe 2, so that the water source with stable pressure produces pressure fluctuations, thereby generating pressure wave codes, and the generated pressure wave codes can interact with the ground.

[0071] The present invention discloses an intelligent downhole stratified well testing flow automatic control and testing system. The intelligent water distributor in the existing multi-level stratified water injection string is replaced by an intelligent downhole stratified well testing injector of the present invention. The intelligent downhole stratified well testing flow automatic control and testing system can generate communication interaction with the ground through pressure wave codes, and can also establish short-range electromagnetic communication with the intelligent downhole stratified well testing injector of the present invention in the well by using a wireless controller, and use the short-range electromagnetic communication to control the measurement and adjustment of the intelligent downhole stratified well testing injector of the present invention, and record the downhole dynamic data stored in the intelligent downhole stratified well testing injector of the present invention, or modify the internal data of the intelligent downhole stratified well testing injector of the present invention in the oil layer.

[0072] Installation and use of a multi-layered water injection string for an intelligent downhole layered well test flow automatic control and testing system:

[0073] Step A: lowering an intelligent stratified water injection string containing an intelligent downhole stratified well testing injector of the present invention, comprising an oil pipe, an intelligent downhole stratified well testing injector of the present invention, and an interlayer packer 19, extending from the wellhead to the perforation section of the water injection well; the upper end of the oil pipe is fixed on the water injection wellhead, and the lower end is connected to the casing protection packer 17 through a thread, the lower end of the casing protection packer 17 is connected to the oil pipe, the lower end of the oil pipe is connected to an intelligent downhole stratified well testing injector of the present invention, the lower end of the intelligent downhole stratified well testing injector of the present invention is connected to the interlayer packer 19, the lower end of the interlayer packer 19 is connected to the oil pipe, the lower end of the oil pipe is connected to an intelligent downhole stratified well testing injector of the present invention, the lower end of the connected intelligent downhole stratified well testing injector of the present invention is connected to the oil pipe, and the lower end of the oil pipe is connected to downhole accessories, the downhole accessories include a pressurized working cylinder, a double-acting valve, a screen pipe, and a thread plug, and the various parts are mechanically connected by threads.

[0074] Step B: test injection. The intelligent downhole stratified well test injection device of the present invention automatically opens the automatic water nozzle 6 according to preset parameters, and the surface water injection system starts water injection to start the full-well test injection.

[0075] Step C: Packer seal verification, the surface water injection system transmits the seal verification instruction to the intelligent downhole stratified well test injector of the present invention by means of pressure wave code, the intelligent downhole stratified well test injector of the present invention starts the seal verification function, closes the water nozzles of the intelligent downhole stratified well test injector of the present invention in other layers to be tested, and the surface water injection system performs the switch opening action. The intelligent downhole stratified well test injector of the present invention transmits the seal verification result to the surface water injection system by means of pressure wave, and stores the seal verification data in the control storage module 8 at the same time.

[0076] Step D: Automatic measurement and adjustment. The intelligent downhole stratified well test injection device of the present invention compares the preset stratified water injection volume with the stratified flow rate tested by the flow meter 9, and automatically adjusts the water nozzle opening through the automatic water nozzle 6 to achieve consistency between the stratified flow rate and the stratified water injection volume, thereby meeting the injection requirements.

[0077] Step E: stratified pressure drop test. The intelligent downhole stratified well test injector of the present invention starts the test according to the preset test cycle of the well test sub 5 or the pressure wave instruction control of the surface water injection system. The well test sub 5 automatically starts the function, closes the automatic water nozzle 6, and performs the stratified pressure drop test. The test diagram is as shown in FIG. Fig. 9 , Fig.10 As shown, after the test, the test data is stored in the control storage module 8, and the well test sub 5 performs well test interpretation and analysis based on the test data to obtain parameters such as the formation pressure, pressure coefficient, formation pressure retention level, fracture half-length, etc. of the well, and transmits the test results to the ground water injection system with the help of pressure waves.

[0078] Step F: Automatic testing and adjustment: After receiving the well test results sent by the intelligent downhole stratified well test and injection device of the present invention, the surface water injection system adjusts the full well flow rate and cooperates to complete the stratified flow test and adjustment to achieve the purpose of intelligent water injection.

[0079] Step G: Data acquisition, using a cable well test vehicle connected to a wireless controller via a cable to go down into the well, and to be positioned and docked with an intelligent downhole stratified well test injection device of the present invention, and to acquire all test data by short-distance electromagnetic communication, and to modify the preset parameters of the integrated well test control injection tool.

[0080] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. The components of the present invention can be combined with each other without conflict, and any equivalent changes and modifications made by any technician in the field without departing from the concept and principle of the present invention should fall within the scope of protection of the present invention.

[0081] The parts not described in detail in this embodiment belong to the commonly known means in the industry and are not described here one by one. The above examples are only examples of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention belong to the protection scope of the present invention.

[0082] It should be noted that all directional indications in this embodiment (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0083] In addition, the descriptions involving "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0084] The technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. An intelligent downhole layered well testing injection device, characterized in that: The invention comprises a working cylinder (31), a flow tube (2) sleeved in the working cylinder (31), and an upper joint (1) and a lower joint (3) respectively connected to the two ends of the working cylinder (31); the working cylinder (31), the flow tube (2), the upper joint (1) and the lower joint (3) form an annular sealed cavity; a flow meter (9), an automatic water nozzle (6), a well test nipple (5), a control storage module (8) and a battery unit (7) are arranged in the annular sealed cavity; a water inlet (29) of the automatic water nozzle (6) is connected to the flow tube (2); one end of the water outlet (30) of the automatic water nozzle (6) extends to the upper joint (1) and is connected to the upper joint (1) through the upper joint (1). The joint (1) is externally connected, and a flow meter (9) is arranged between the water inlet (29) and the water outlet (30); the upper joint (1) is connected to a well test sub (5); the lower joint (3) is connected to a battery unit (7) and a control storage module (8) for obtaining data of the well test sub (5) and controlling an automatic water nozzle (6), and the control storage module (8) is electrically connected to the battery unit (7), the flow meter (9), the well test sub (5) and the automatic water nozzle (6), respectively; the upper joint (1) is connected to a wireless communication module (4) for transmitting data stored in the control storage module (8), and the wireless communication module (4) is electrically connected to the control storage module (8); The automatic water nozzle (6) further comprises a flow control valve, a connecting rod (26) and a flow control cavity between a water inlet (29) and a water outlet (30), wherein the flow control valve comprises a valve sleeve (23) and a valve core (24), wherein the valve sleeve (23) of the flow control valve in the flow control cavity is fixed to the inner wall of the flow control cavity, the valve core (24) of the flow control valve is connected to one end of the connecting rod (26), and the other end of the connecting rod (26) has a ball screw assembly (25) and a drive motor (22), and the connecting rod (26) ) is coaxially connected to the driving motor (22) through a ball screw assembly (25); when the driving motor (22) extends the connecting rod (26) through the ball screw assembly (25), the flow control valve in the flow control cavity is opened, and the water inlet (29) and the water outlet (30) are connected; when the driving motor (22) retracts the connecting rod (26) through the ball screw assembly (25), the flow control valve in the flow control cavity is closed, and the water inlet (29) and the water outlet (30) are closed; The ball screw assembly (25) comprises a ball screw pair and a guide groove for radially fixing and axially sliding a nut of the ball screw pair; when the lead screw of the ball screw pair rotates, the nut of the ball screw pair slides axially along the guide groove; one end of the nut extends to form an inner cavity for the lead screw to penetrate the nut; one end of the nut is connected to a connecting rod (26), and the other end of the nut is connected to the lead screw; the lead screw is coaxially connected to the drive motor (22); the guide groove is parallel to the motor shaft of the drive motor (22), and the guide groove and the drive motor (22) are relatively fixed; A high-precision pressure gauge (33) and a control module (34) are integrated in the well test sub (5). The control module (34) is responsible for control, storage and analysis. The high-precision pressure gauge (33) tests the stratified pressure and the pressure in the flow pipe (2).

2. An intelligent downhole layered well testing injector as claimed in claim 1, characterized in that: The connecting rod (26), the flow control cavity and the ball screw assembly (25) are provided with a shell outside, and the connecting rod (26), the flow control cavity and the ball screw assembly (25) are located inside the shell, the water inlet (29) is connected to the flow pipe (2) through the shell, and the water outlet (30) is connected to the water injection oil layer through the shell, and the two ends of the flow control valve located in the shell are provided with a first balanced pressure chamber (21) for transmitting the internal pressure to one end of the flow control valve and a second balanced pressure chamber (20) for transmitting the internal pressure to the other end of the flow control valve, and the first balanced pressure chamber (21) and the second balanced pressure chamber (20) are connected to the flow pipe (2).

3. An intelligent downhole layered well testing injection device as claimed in claim 2, characterized in that: The driving motor (22) is a servo motor, which includes a position marker and a control circuit. The control circuit and the position marker constitute a position marker servo control system. The control storage module (8) is electrically connected to the servo motor via the position marker servo control system.

4. An intelligent downhole layered well testing injector as claimed in claim 3, characterized in that: The position marker is composed of a Hall sensor (27) and a magnetic steel (28). The position marker is fixed to the upper end of the servo motor and is sleeved inside the housing.

5. A multi-stage layered water injection string, characterized by: It comprises the intelligent downhole stratified well testing injection device as described in claim 4.

6. An intelligent downhole stratified well test flow automatic control and testing system, characterized in that: It at least comprises the multi-stage layered water injection string as claimed in claim 5; A wireless controller, comprising: A shell (13) that can be inserted deep into a flow tube (2), the front end of the shell (13) being connected to an antenna (16), the rear end of the shell (13) being provided with a cable connector (10) and a positioning claw (11), the rear end of the shell (13) being connected to the cable connector (10) via the positioning claw (11); a main control module (14), a magnetic positioning short section (12) and a communication module (15) for short-distance communication with a wireless communication module (4) are sealed in the shell (13), the main control module (14) being electrically connected to the cable connector (10), the magnetic positioning short section (12), the communication module (15) and the positioning claw (11) respectively; When the positioning claw (11) used for docking with the diameter reducing portion of the upper joint (1) is opened and passes through the upper joint (1), the wireless control instrument is connected to the upper joint (1) via the positioning claw (11).

7. An intelligent downhole stratified well test flow automatic control and testing system as claimed in claim 6, characterized in that: The multi-stage layered water injection string comprises a casing protection packer (17), an interlayer packer (19) and downhole accessories. The intelligent downhole layered well testing injector (18) is connected between the casing protection packer (17) and the downhole accessories. Two adjacent intelligent downhole layered well testing injectors (18) are connected in sequence through the interlayer packers (19). The oil pipe at the wellhead of the water injection well is connected to the topmost intelligent downhole layered well testing injector (18) through the casing protection packer (17). The lower end of the intelligent downhole layered well testing injector (18) at the bottom is connected to the downhole accessories. The downhole accessories comprise a preset working cylinder, a double-acting valve, a screen tube and a wire plug connected in sequence.

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