Downhole self-powered signal transmission device

Abstract

The present application relates to the technical field of oil production engineering, and particularly relates to a downhole self-powered signal transmission device, which comprises: a bottom end of an upper main body is connected with an insertion joint; a self-generating mechanism for generating electric energy through well fluid is arranged in the upper main body, and the self-generating mechanism is connected with the insertion joint; an internal part of a lower main body is provided with a receiving socket matched with the insertion joint; a signal transmitting assembly connected with a ground controller is arranged in the internal part of the insertion joint; a signal receiving assembly connected with a downhole measurement and control integrated production allocation device is arranged in the internal part of the receiving socket; the signal transmitting assembly is used for receiving a control signal sent by the ground controller and transmitting the control signal to the signal receiving assembly wirelessly. The downhole self-powered signal transmission device is used to solve the problems that the existing docking device is docked and sealed through a sealing ring and an insertion sealing section, the success rate of one-time docking is low, the sealing ring is easily damaged and fails after being used for many times, a circuit system is short-circuited, a technological pipe column function is lost, and a large amount of manpower and resources are consumed during maintenance.

Description

Technical Field

[0001] This invention relates to the field of oil production engineering technology, and in particular to a downhole self-powered signal transmission device. Background Technology

[0002] Currently, domestic oilfield stratified production technology is gradually developing towards intelligence and automation. The existing cable-based stratified oil production technology primarily involves connecting a downhole integrated monitoring and control system (38) via a surface-mounted cable. This system controls the downhole monitoring and control system from the surface, collecting real-time data on downhole temperature, pressure, and flow rate, and directly controlling the flow rate of each stratified section. Since oil wells involve pump inspection operations, requiring periodic tripping of the pump tubing, the stratified oil production process tubing adopts a drop-off design to meet the requirement of not moving the stratified production tubing during pump inspection operations. After drop-off, the tubing is connected to the stratified production tubing via a drop-off docking device, enabling power supply and signal transmission to the downhole tools.

[0003] The currently used secondary docking device adopts a traditional O-ring sealing ring plus insertion sealing section structure design. During docking, the sealing ring is prone to damage and failure, which leads to sealing failure, short circuit in the circuit system, and ultimately failure of the entire process tubing. The success rate of both single and multiple docking is low. In addition, once docking fails, the surface cannot effectively control the opening of the production distribution valve, making the well unable to produce normally and no other remedial measures can be taken. The only option is to pull out the entire tubing and start construction again, which consumes a lot of manpower and resources. Summary of the Invention

[0004] This invention proposes a downhole self-powered signal transmission device to solve the problems of existing docking devices that use sealing rings and insert sealing sections for docking and sealing, resulting in a low success rate of docking on the first attempt, and the sealing rings being prone to damage and failure after multiple uses, leading to short circuits in the circuit system, failure of the process tubing function, and the need for a lot of manpower and resources for maintenance.

[0005] According to one aspect of the present invention, a downhole self-powered signal transmission device is provided, comprising: an upper body and a lower body;

[0006] The bottom end of the upper body is connected to the insertion connector;

[0007] The upper body is equipped with a self-generating mechanism for generating electrical energy through well fluid, and the self-generating mechanism is connected to the insertion joint.

[0008] The lower body is provided with a receiving socket that matches the insertion connector. The receiving socket is used to receive and store the electrical energy output by the self-generating mechanism transmitted through the insertion connector and transmit it to the distributor.

[0009] The insertion joint is internally provided with a signal transmitting assembly connected with the ground controller, the receiving socket is internally provided with a signal receiving assembly connected with the downhole measurement and control integrated allocation device, the signal transmitting assembly is used for receiving the control signal sent by the ground controller and wirelessly transmitting the control signal to the signal receiving assembly.

[0010] Preferably, the self-power generation mechanism comprises a middle shaft, an upper support body, a first lower support body, a second lower support body, an inner coil, an outer coil and a first battery pack.

[0011] The upper support body, the first lower support body and the second lower support body are fixed inside the upper main body, the top end of the middle shaft is connected with the upper support body in a shaft manner, the middle shaft passes through the first lower support body and is connected with the second lower support body at the bottom end.

[0012] A impeller is arranged on the middle shaft between the upper support body and the first lower support body.

[0013] A liquid outlet is arranged on the upper support body, and a liquid inlet is arranged on the side wall of the upper main body between the upper support body and the first lower support body.

[0014] The inner coil is fixed on the middle shaft between the first lower support body and the second lower support body, and the outer coil is fixed on the inner side wall of the upper main body between the first lower support body and the second lower support body.

[0015] The first battery pack is connected with the inner coil, the receiving socket and the signal transmitting assembly respectively.

[0016] Preferably, a throat structure is arranged inside the upper main body between the impeller and the liquid inlet.

[0017] The diameter of the channel at the throat is 5-10 mm.

[0018] Preferably, the body of the insertion joint is Y-shaped and hollow, and the upper end of the Y-shaped branch of the insertion joint is connected with the upper main body.

[0019] The power output coil and the signal transmitting assembly are mounted inside the insertion joint.

[0020] The power output coil is connected with the self-power generation mechanism.

[0021] Preferably, the upper main body and the insertion joint are connected through a telescopic connecting mechanism, the telescopic connecting mechanism is used for enabling the insertion joint to move upward or downward by a certain distance while keeping the connection between the upper main body and the insertion joint.

[0022] Preferably, the telescopic connecting mechanism comprises a pin column, a telescopic pipe, a track pin and an elastic lead wire.

[0023] The top end of the pin column is connected to the bottom end of the upper body, and the bottom end of the pin column is provided with a mounting groove, and the top end of the telescopic tube is inserted into the mounting groove;

[0024] The inside wall of the mounting groove is provided with the track pin, and the side wall of the telescopic tube is provided with a movable slot at a position corresponding to the track pin;

[0025] One end of the track pin is inserted into the movable slot, and the track pin and the top surface in the movable slot are respectively a certain distance apart;

[0026] The top end of the insertion joint is connected to the bottom end of the telescopic tube;

[0027] The elastic wire is arranged outside the telescopic tube, one end of the elastic wire is connected to the self-generating mechanism, and the other end is connected to the insertion joint.

[0028] Preferably, the inside of the receiving socket is provided with a power input coil, a ring-shaped battery pack, and a signal receiving assembly;

[0029] The inside of the receiving socket is matched in shape with the outside of the insertion joint;

[0030] The power input coil is connected to the ring-shaped battery pack, and the ring-shaped battery pack and the signal receiving assembly are respectively connected to the production allocator through cables.

[0031] Preferably, the side wall of the insertion joint is provided with an upper magnetic ring, and the receiving socket is provided with a lower magnetic ring matched with the upper magnetic ring for magnetic connection.

[0032] Preferably, it further comprises a release upper joint, a release sleeve, a spring claw, a limiting ring, and a shear pin;

[0033] The upper end of the lower body is connected to the release sleeve;

[0034] The bottom end of the release upper joint is provided with a spring claw, the inside wall of the release sleeve is provided with a clamping slot matched with the spring claw, and the spring claw is inserted into the clamping slot;

[0035] A limiting ring is arranged between the outside wall of the lower body and the corresponding inside wall of the release sleeve, the upper end of the limiting ring is between the spring claw and the lower body, and the limiting ring and the release sleeve are connected through a shear pin;

[0036] The outside wall of the lower body is provided with a step, the limiting ring is above the step and a certain distance apart from the step.

[0037] The present application has at least the following beneficial effects:

[0038] The present application provides a downhole self-powered signal transmission device, which solves the problem of low reliability of the butt joint after the cable layered oil production process is released by setting the insertion connector and the receiving socket and the wireless signal transmission and receiving assembly, can transmit signals and power after the layered production allocation string is set and released, has high butt joint success rate, and improves the process reliability; the self-power generation mechanism is provided, so that the power supply is not needed during use, and the construction convenience and safety are improved. BRIEF DESCRIPTION OF DRAWINGS

[0039] The drawings incorporated into the specification and forming a part thereof show embodiments consistent with the present application and, together with the specification, serve to explain the technical solutions of the present application.

[0040] Figure 1 A structure schematic view of an upper main body of the downhole self-powered signal transmission device according to the embodiment of the present application is shown;

[0041] Figure 2 A structure schematic view of a lower main body of the downhole self-powered signal transmission device according to the embodiment of the present application is shown.

[0042] In the drawings, 1 is an upper main body, 2 is a lower main body, 3 is an insertion connector, 4 is a receiving socket, 5 is a signal transmission assembly, 6 is a signal receiving assembly, 7 is a middle shaft, 8 is an upper support body, 9 is a first lower support body, 10 is a second lower support body, 11 is an inner coil, 12 is an outer coil, 13 is a first battery pack, 14 is an impeller, 15 is a liquid outlet, 16 is a liquid inlet, 17 is a throat pipe, 18 is a power output coil, 19 is a pin column, 20 is an extension tube, 21 is a track pin, 22 is an elastic wire, 23 is a mounting groove, 24 is a movable groove, 25 is a power input coil, 26 is a ring-shaped battery pack, 27 is an upper magnetic attraction ring, 28 is a lower magnetic attraction ring, 29 is a releasing upper connector, 30 is a releasing outer sleeve, 31 is a spring claw, 32 is a limiting ring, 33 is a shearing pin, 34 is a step, 35 is a bearing, 36 is a sealing sleeve, 37 is a sealing screw, and 38 is a cable. EMBODIMENT

[0043] Various exemplary embodiments, features and aspects of the present application will be explained in detail below with reference to the drawings. The same reference numerals in the drawings represent elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0044] The word "exemplary" herein means "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations.

[0045] The term "and / or", as used herein, merely describes association between associated objects, and can indicate that three cases can exist, for example, A and / or B can indicate that A exists alone, A and B exist together, and B exists alone. In addition, the term "at least one" herein indicates any one of a plurality or any combination of at least two of a plurality, for example, at least one of A, B, and C can indicate any one or more elements selected from the set consisting of A, B, and C.

[0046] In addition, in order to better illustrate the present application, numerous specific details are given in the specific embodiments below. Those skilled in the art should understand that the present application can be implemented without certain specific details. In some examples, methods, means, elements and circuits well known to those skilled in the art are not described in detail, in order to highlight the main idea of the present application.

[0047] Figure 1 A structural schematic diagram of an upper body of a downhole self-powered signal transmission device according to an embodiment of the present application is shown. Figure 2 A structural schematic diagram of a lower body of a downhole self-powered signal transmission device according to an embodiment of the present application is shown. As Figure 1 and 2 As shown, a downhole self-powered signal transmission device includes an upper body 1 and a lower body 2; the bottom end of the upper body 1 is connected to an insertion joint 3; a self-power generation mechanism for generating electric energy through well fluid is arranged inside the upper body 1, and the self-power generation mechanism is connected to the insertion joint 3; a receiving socket 4 matched with the insertion joint 3 is arranged inside the lower body 2, the receiving socket 4 is used to receive and store electric energy output by the self-power generation mechanism transmitted through the insertion joint 3, and transmit the electric energy to a production allocator; a signal transmitting assembly 5 connected to a surface controller is arranged inside the insertion joint 3, a signal receiving assembly 6 connected to a downhole measurement and control integrated production allocator is arranged inside the receiving socket 4, and the signal transmitting assembly 5 is used to receive a control signal sent by the surface controller, and wirelessly transmit the control signal to the signal receiving assembly 6.

[0048] In the embodiment of the present application, during construction, the pipe string containing the allocation device, the packer and the lower body 2 is lowered to the target position in the well. Hydraulic pressure is added in the tubing to set the packer and release the pipe string. After the release pipe string is pulled out, the upper body 1 is connected to the lower end of the oil pump and lowered into the well. When reaching above the lower body 2, the insertion joint 3 at the bottom gradually inserts into the receiving socket 4 of the lower body 2, thereby completing the butt joint. In use, the self-generating mechanism in the upper body 1 generates electricity under the action of the well fluid. The generated electric energy is transmitted to the allocation device through the insertion joint 3 and the receiving socket 4 for power supply. At the same time, the signal transmitting assembly 5 in the insertion joint 3 is connected to the self-generating mechanism, and the signal receiving assembly 6 in the receiving socket 4 is connected to the receiving socket 4. The electric energy generated by the self-generating mechanism is transmitted to the signal transmitting assembly 5 for power supply, and at the same time, it is transmitted to the signal receiving assembly 6 through the receiving socket 4 for power supply.

[0049] When the allocation device is regulated, the ground controller transmits a control signal to the signal transmitting assembly 5. The signal transmitting assembly 5 and the signal receiving assembly 6 are connected through a wireless transmission module. The signal transmitting assembly 5 transmits the control signal to the signal receiving assembly 6 wirelessly. After the signal receiving assembly 6 receives the control signal, it controls the allocation device to measure and regulate through the internal control circuit. The wireless transmission of the control signal can be realized through the signal transmitting assembly 5 and the signal receiving assembly 6. The control circuit in the signal receiving assembly 6 can realize the measurement and regulation of the allocation device in the well, and set the timing to open the debugging allocation device instruction according to the field situation. The signal transmitting assembly 5 and the signal receiving assembly 6 can realize the measurement and regulation of the allocation device through the built-in control circuit of the signal receiving assembly 6 in the case of butt joint failure of the insertion joint 3 and the receiving socket 4, without affecting the subsequent production, which can effectively avoid the problem of failure to debug the allocation device due to butt joint failure, corrosion of well fluid, broken cable and other phenomena when connected by wire.

[0050] In the application, the self-generating mechanism comprises a middle shaft 7, an upper support 8, a first lower support 9, a second lower support 10, an inner coil 11, an outer coil 12 and a first battery group 13; the upper support 8, the first lower support 9 and the second lower support 10 are fixed inside the upper main body 1, the top end of the middle shaft 7 is connected with the upper support 8 through a shaft, the middle shaft 7 passes through the first lower support 9 and is connected with the second lower support 10 at the bottom end; the impeller 14 is arranged on the middle shaft 7 between the upper support 8 and the first lower support 9; the upper support 8 is provided with a liquid outlet 15, and the sidewall of the upper main body 1 between the upper support 8 and the first lower support 9 is provided with a liquid inlet 16; the inner coil 11 is fixed on the middle shaft 7 between the first lower support 9 and the second lower support 10, and the outer coil 12 is fixed on the inner sidewall of the upper main body 1 between the first lower support 9 and the second lower support 10; the first battery group 13 is connected with the inner coil 11, the receiving socket 4 and the signal transmitting assembly 5 respectively.

[0051] In the embodiment of the application, the space between the upper support 8 and the first lower support 9 inside the upper main body 1 is a generating cavity, the top end of the middle shaft 7 is connected with the upper support 8 through a bearing 35 and a screw shaft, the sidewall is connected with the first lower support 9 through a bolt and the bearing 35, and the middle shaft 7 can rotate along the axis. The upper support 8 is provided with a plurality of liquid outlets 15; the impeller 14 is arranged close to the upper support 8, and the impeller 14 is arranged in two layers on the outer sidewall of the middle shaft 7; the sidewall of the upper support 8 in the generating cavity is provided with a plurality of liquid inlets 16 close to the first lower support 9.

[0052] In the upper main body 1, the space between the first lower support 9 and the second lower support 10 is a sealed cavity, the sidewall of the middle shaft 7 is connected with the second lower support 10 through a bolt and a bearing 35; the inner coil 11 is sleeved on the bearing 35 in the sealed cavity, and the outer coil 12 is arranged on the sidewall in the sealed cavity.

[0053] The first battery group 13 is arranged between the second lower support 10 and the insertion connector 3; during power generation, well fluid enters the generating cavity through the liquid inlet 16, moves upward along the middle shaft 7, drives the impeller 14 to rotate when reaching the impeller 14, drives the middle shaft 7 to rotate through the impeller 14, drives the inner coil 11 to rotate through the middle shaft 7, and generates electricity through electromagnetic induction principle with the outer coil 12, and transmits the electric energy to the first battery group 13; the first battery group 13 stores the electric energy and transmits the electric energy to the receiving socket 4 through the insertion connector 3, transmits the electric energy to the production distributor through the receiving socket 4 for power supply. At the same time, the first battery group 13 transmits the electric energy to the signal transmitting assembly 5 for power supply, and transmits the electric energy to the signal receiving assembly 6 through the insertion connector 3 and the receiving socket 4 for power supply.

[0054] In the application, the throat 17 structure is arranged inside the upper body 1 between the impeller 14 and the liquid inlet 16; the diameter of the passage at the throat 17 is 5-10 mm.

[0055] In the embodiment of the application, the throat 17 structure is that the inner wall of the upper body 1 and the outer side wall of the corresponding middle shaft 7 each have an arc-shaped protruding part, and the distance between the protruding parts is narrow, with a closest distance of 5-10 mm.

[0056] When the oil pump pumps oil, the fluid in the well moves upward at a certain flow rate. After the well fluid enters the inside of the upper body 1 from the liquid inlet 16, it moves upward to the throat 17 structure, and when passing through the throat 17, the flow rate is increased again due to the narrowing of the passage, accelerating the rotation of the impeller 14, the middle shaft 7 and the inner coil 11, thereby improving the power generation capacity.

[0057] In the application, the body of the insertion connector 3 is Y-shaped and hollow, and the upper end of the Y-shaped branch of the insertion connector 3 is connected to the upper body 1; the power output coil 18 and the signal emitting assembly 5 are arranged inside the insertion connector 3; the power output coil 18 is connected to the self-power generation mechanism.

[0058] In the embodiment of the application, the power output coil 18 is connected to the first battery pack 13 and the signal emitting assembly 5 respectively; the signal emitting assembly 5 is arranged at the bottom of the hollow inside of the Y-shaped insertion connector 3, the power output coil 18 is arranged above the signal emitting assembly 5, and the material of the insertion connector 3 is insulating material. When the insertion connector 3 is connected to the receiving socket 4, the electric energy of the first battery pack 13 is transmitted to the power output coil 18, and the power output coil 18 transmits the electric energy to the receiving socket 4. The first battery pack 13 transmits electric energy to the signal emitting assembly 5.

[0059] In the application, the upper body 1 and the insertion connector 3 are connected through a telescopic connecting mechanism, which is used to make the insertion connector 3 move upward or downward by a certain distance while keeping the connection between the upper body 1 and the insertion connector 3.

[0060] In the embodiment of the present application, during the oil extraction process, the pipe string will be constantly extended and contracted to change the length under the influence of pumping, and after the insertion joint 3 of the upper body 1 and the receiving socket 4 of the lower body 2 are connected, the frequent movement of the insertion joint 3 and the gap between the receiving socket 4 may cause the transmission of signals and electric energy of the signal transmission assembly to be affected. Through the extension and contraction of the extension and contraction connecting mechanism, the insertion joint 3 is kept connected with the upper body 1 and the first battery pack 13 while having a certain up and down movement space, and when the upper body 1 moves slightly upward, the insertion joint 3 is kept inside the receiving socket 4, which eliminates the influence of the peristalsis of the oil pipe on the connection of the insertion joint 3 and the receiving socket 4 and guarantees the stability of signal transmission.

[0061] In the present application, the extension and contraction connecting mechanism comprises a pin column 19, an extension and contraction pipe 20, a track pin 21 and an elastic wire 22; the top end of the pin column 19 is connected with the bottom end of the upper body 1, the bottom end of the pin column 19 is provided with a mounting groove 23, and the top end of the extension and contraction pipe 20 is inserted into the inside of the mounting groove 23; the inside wall of the mounting groove 23 is provided with the track pin 21, and the side wall of the extension and contraction pipe 20 is provided with a movable groove 24 at a position corresponding to the track pin 21; one end of the track pin 21 is inserted into the inside of the movable groove 24, and the track pin 21 and the top surface in the movable groove 24 are respectively provided with a certain distance; the top end of the insertion joint 3 is connected with the bottom end of the extension and contraction pipe 20; the elastic wire 22 is arranged outside the extension and contraction pipe 20, one end of the elastic wire 22 is connected with the self-generating mechanism, and the other end is connected with the insertion joint 3.

[0062] In the embodiment of the present application, the inside of the extension and contraction pipe 20 is hollow, which is convenient for reducing the weight of the device; after the extension and contraction pipe 20 is inserted into the mounting groove 23, the extension and contraction pipe 20 is connected with the pin column 19 through the track pin 21, one end of the track pin 21 is provided with a certain distance from the top and bottom of the movable groove 24, and when the top end of the extension and contraction pipe 20 contacts with the top of the mounting groove 23, the track pin 21 is located at the middle position in the movable groove 24. The elastic wire 22 is spiral-shaped and is sleeved outside the extension and contraction pipe 20.

[0063] A sealing jacket 36 is sleeved outside the pin column 19 and the extension and contraction pipe 20, the inside wall close to the top end of the sealing jacket 36 is connected with the outside wall of the pin column 19 through threads; the upper end of the insertion joint 3 is inserted into the inside of the sealing jacket 36 from the bottom opening of the sealing jacket 36, and the outside wall of the part of the insertion joint 3 in the sealing jacket 36 is tightly attached to the inside wall of the sealing jacket 36.

[0064] When the insertion joint 3 is connected with the receiving socket 4, the pipe column stretches and shrinks to move the upper body 1, the pin column 19 and the sealing sleeve 36 up and down; when the upper body 1 and the pin column 19 move upward, the track pin 21 moves toward the inner top of the movable slot 24, at this time, the telescopic pipe 20 keeps stable in the receiving socket 4 due to the gravity of itself and the connected insertion joint 3, and the position does not move up and down; the elastic wire 22 is stretched or shortened when the distance between the pin column 19 and the insertion joint 3 increases or decreases, so as to ensure the stability of the signal transmission in the insertion joint 3. The length of the part of the insertion joint 3 in the sealing sleeve 36 needs to be greater than the distance between the track pin 21 and the inner top of the movable slot 24 when the top of the telescopic pipe 20 is close to the inner top of the installation slot 23, so as to prevent the insertion joint 3 from being separated from the sealing sleeve 36 when the telescopic pipe 20 is stretched to the maximum length in the installation slot 23.

[0065] When the upper body 1 is lowered or taken out and the insertion joint 3 is separated from the receiving socket 4, the upper body 1 is moved by the pipe column, and the upper body 1 is clamped in the movable slot 24 by the pin column 19 and the track pin 21, so as to move the telescopic pipe 20 and the insertion joint 3.

[0066] In the application, the inside of the receiving socket 4 is provided with a power input coil 25, a ring-shaped battery group 26 and the signal receiving assembly 6; the inside shape of the receiving socket 4 matches the outside shape of the insertion joint 3; the power input coil 25 is connected with the ring-shaped battery group 26, and the ring-shaped battery group 26 and the signal receiving assembly 6 are respectively connected with the production distributor through cables 38.

[0067] In the embodiment of the application, the receiving socket 4 is a cylinder, the inside of which is provided with the ring-shaped battery group 26, the upper part of the ring-shaped battery group 26 is provided with the power input coil 25, and the lower part is provided with the signal receiving assembly 6; the hollow inside formed by the ring-shaped battery group 26, the power input coil 25 and the signal receiving assembly 6 matches the outside shape of the insertion joint 3; the top end of the receiving socket 4 is provided with a gradually downward inclined surface from outside to inside, which facilitates the bottom end of the insertion joint 3 to slide into the inside of the receiving socket 4 along the inclined surface when the bottom end of the insertion joint 3 contacts the top end of the receiving socket 4.

[0068] The bottom end of the receiving socket 4 is connected with a sealing end cover, and the lower part of the sealing end cover is provided with a pressing cap; one end of the cable 38 is in the inside of the pressing cap, the cable 38 is fixed on the sealing end cover through a sealing screw 37, and the one end of the cable 38 penetrates through the sealing end cover to be connected with the signal receiving assembly 6 and the ring-shaped battery group 26.

[0069] When the bottom end of the insertion joint 3 is inserted into the hollow interior of the receiving socket 4, the power input coil 25 corresponds to the position of the power output coil 18, and the signal transmitting assembly 5 corresponds to the position of the signal receiving assembly 6; the power output coil 18 outputs electric energy, which is transmitted to the power input coil 25 through the principle of electromagnetic induction wireless charging, and the power input coil 25 transmits the received electric energy to the annular battery pack 26; the annular battery pack 26 stores the electric energy and transmits it to the signal receiving assembly 6 for power supply and to the production allocator through the cable 38 for power supply.

[0070] When the insertion joint 3 and the receiving socket 4 fail to be docked, the production allocator can be turned on through the timing program built in the signal receiving assembly 6, so as to ensure that the production allocator realizes normal measurement and adjustment functions.

[0071] Before going down the well, the first battery pack 13 and the annular battery pack 26 have pre-stored electric energy, which can still provide electric energy for the signal transmitting and receiving assemblies and measure and adjust the production allocator when the insertion joint 3 and the receiving socket 4 fail to be docked and the distance between the power input and output coils is too far.

[0072] In the present application, the side wall of the insertion joint 3 is provided with an upper magnetic attraction ring 27, and the receiving socket 4 is provided with a lower magnetic attraction ring 28 which is magnetically connected with the upper magnetic attraction ring 27.

[0073] In the embodiment of the present application, the upper magnetic attraction ring 27 is arranged at the bottom of the two arms of the Y-shaped insertion joint 3, and the lower magnetic attraction ring 28 is arranged on the inclined surface at the top end of the receiving socket 4; when the insertion joint 3 is docked with the receiving socket 4, the upper magnetic attraction ring 27 corresponds to the position of the lower magnetic attraction ring 28 and is attached together due to magnetic attraction, so as to fix the two through magnetic attraction, thereby improving the stability of docking and signal transmission.

[0074] In the present application, it further includes a release upper joint 29, a release sleeve 30, a spring claw 31, a limiting ring 32 and a shearing pin 33; the upper end of the lower main body 2 is connected with the release sleeve 30; the bottom end of the release upper joint 29 is provided with the spring claw 31, the inner side wall of the release sleeve 30 is provided with a clamping groove which cooperates with the spring claw 31, and the spring claw 31 is inserted into the clamping groove; the limiting ring 32 is arranged between the outer side wall of the lower main body 2 and the corresponding inner side wall of the release sleeve 30, the upper end of the limiting ring 32 is between the spring claw 31 and the lower main body 2, and the limiting ring 32 and the release sleeve 30 are connected through the shearing pin 33; the outer side wall of the lower main body 2 is provided with a step 34, and the limiting ring 32 is above the step 34 and has a certain distance from the step 34.

[0075] In the embodiment of the present application, the upper end of the lower body 2 is inserted into the inside of the release sleeve 30 from the bottom end of the release sleeve 30 and is connected with the release sleeve 30 through screw threads; a step 34 is arranged on the side wall of the lower body 2 in the release sleeve 30, and an annular space is formed between the lower body 2 above the step 34 and the release sleeve 30; a limiting ring 32 is sleeved outside the lower body 2 and is located in the annular space, and there is a certain distance between the bottom end of the limiting ring 32 and the bottom of the annular space. The inner side wall of the limiting ring 32 is tightly attached to the lower body 2, and part of the outer side wall of the limiting ring 32 is tightly attached to the inner side wall of the release sleeve 30; a clamping groove is arranged on the inner side wall of the release sleeve 30 corresponding to the limiting ring 32, the bottom end of the spring claw 31 is inserted between the limiting ring 32 and the release sleeve 30 from the top end of the limiting ring 32 downward, and the protruding part outside the bottom end of the spring claw 31 is inserted into the inside of the clamping groove; the limiting ring 32 is tightly attached to the spring claw 31, the spring claw 31 is clamped in the inside of the clamping groove and cannot move upward, so that the connection and fixation of the release upper joint 29 and the release sleeve 30 are realized.

[0076] During construction, the release upper joint 29 is connected with the oil pipe, the release upper joint 29, the lower body 2, the production distributor and the packer are lowered into the target position in the well through the oil pipe, and after the packer is set and sealed, the inside of the oil pipe is pressurized, the liquid enters the inside of the release sleeve 30 through the release upper joint 29, and when reaching the top of the limiting ring 32, the limiting ring 32 is pushed to cut the shear pin 33 downward, i.e. in the direction of the bottom of the annular space, as the pressure rises; when the limiting ring 32 moves away from the bottom end of the spring claw 31, the spring claw 31 slides out of the inside of the clamping groove and is separated from the release sleeve 30, the oil pipe drives the release upper joint 29 and the spring claw 31 to move upward and away from the release sleeve 30, so that the release is completed.

[0077] It can be understood that the above-mentioned various embodiments of the present application can be combined with each other to form combined embodiments without deviating from the principle logic, and the present application will not be described in detail due to the limited space.

[0078] The downhole self-powered signal transmission device of the present application solves the problem of low reliability of the butt joint after the cable layer-by-layer oil production process is released, can perform signal transmission and power supply after the layer-by-layer production distribution pipe string is set and released, can cope with various unexpected butt joint failure conditions, and improves the process reliability. The self-generating mechanism and the battery pack are arranged to supply power and store energy, so that an additional power supply is not needed during measurement and adjustment, and the construction convenience and safety are improved; the plug-in connector 3 and the receiving socket 4 are arranged to realize repeated and reliable butt joint after the cable layer-by-layer oil production process is released, avoid the failure of the butt joint to cause the failure of the entire process pipe string, and improve the process success rate; the power supply and the control signal transmission are transmitted and received in a wireless manner and are not affected by the well fluid; the telescopic connecting mechanism is adopted to eliminate the influence of the signal transmission caused by the peristalsis of the pump extraction pipe string during the oil production process; and the device has a timing switch function and has the disposal ability of opening the valve of the production distributor in an emergency.

[0079] Having described various embodiments of the application, it is to be understood that the above description is meant not to limit and not to encompass all of the possible embodiments covered by the claims. Many modifications and variations of this application can be apparent to those of ordinary skill in the art without departing from the spirit and scope of the described embodiments. It is intended that the scope of the application should only be limited by the appended claims.

Claims

1. A downhole self-powered signal transmission device, characterized in that, The device comprises: an upper body (1) and a lower body (2); the bottom end of the upper body (1) is connected with an insertion joint (3); a self-generating mechanism for generating electric energy through well fluid is arranged inside the upper body (1), and the self-generating mechanism is connected with the insertion joint (3); the self-generating mechanism comprises: an upper support body, a first lower support body and a second lower support body fixed inside the upper body, a middle shaft, a top end of the middle shaft is connected with the upper support body, the middle shaft passes through the first lower support body, and a bottom end is connected with the second lower support body; a impeller is arranged on the middle shaft between the upper support body and the first lower support body; a liquid outlet is arranged on the upper support body, a liquid inlet is arranged on the sidewall of the upper body between the upper support body and the first lower support body; an inner coil is fixed on the middle shaft between the first lower support body and the second lower support body, and an outer coil is fixed on the inner sidewall of the upper body between the first lower support body and the second lower support body; a throat structure is arranged inside the upper body between the impeller and the liquid inlet; the diameter of the channel at the throat is 5-10mm; an electric power output coil is arranged inside the insertion joint; the electric power output coil is connected with the self-generating mechanism; a receiving socket (4) matched with the insertion joint (3) is arranged inside the lower body (2), the receiving socket (4) is used for receiving and storing the electric energy output by the self-generating mechanism through the insertion joint (3) and transmitting the electric energy to a production allocation device; an electric power input coil, a ring-shaped battery group and a signal receiving assembly are arranged inside the receiving socket; the electric power input coil is connected with the ring-shaped battery group, the ring-shaped battery group and the signal receiving assembly are respectively connected with the production allocation device through cables; the material of the insertion joint is insulating material, and the electric power output coil transmits electric energy to the electric power input coil through the principle of electromagnetic induction wireless charging; a signal transmitting assembly (5) connected with a ground controller is arranged inside the insertion joint (3), a signal receiving assembly (6) connected with a downhole measurement and control integrated production allocation device is arranged inside the receiving socket (4), the signal transmitting assembly (5) is used for receiving the control signal sent by the ground controller and transmitting the control signal to the signal receiving assembly (6) wirelessly; a control circuit is arranged inside the signal receiving assembly, the control circuit is used for realizing measurement and adjustment of the production allocation device in the well and setting a timing opening debugging production allocation device instruction according to the field situation; when the insertion joint and the receiving socket fail to be connected, the timing program built in the signal receiving assembly is used to complete opening of the production allocation device.

2. The downhole self-powered signal transmission device according to claim 1, wherein: a first battery group (13) is connected with the inner coil (11), the receiving socket (4) and the signal transmitting assembly (5) respectively.

3. The downhole self-powered signal transmission device according to claim 1, wherein: the body of the insertion joint (3) is Y-shaped and hollow, and the upper end of the Y-shaped branch of the insertion joint (3) is connected with the upper body (1).

4. The downhole self-powered signal transmission device according to claim 1, wherein: The upper body (1) and the insertion joint (3) are connected by a telescopic connecting mechanism, which is used to make the insertion joint (3) move up or down a certain distance while keeping the connection between the upper body (1) and the insertion joint (3).

5. A downhole self-powered signal transmission device according to claim 4, wherein, The telescopic connecting mechanism includes a pin column (19), a telescopic tube (20), a track pin (21), and an elastic guide wire (22). The top end of the pin column (19) is connected to the bottom end of the upper body (1), and the bottom end of the pin column (19) is provided with a mounting groove (23), and the top end of the telescopic tube (20) is inserted into the inside of the mounting groove (23). The inside wall of the mounting groove (23) is provided with the track pin (21), and the side wall of the telescopic tube (20) is provided with a movable groove (24) at the corresponding position of the track pin (21). One end of the track pin (21) is inserted into the inside of the movable groove (24), and the track pin (21) and the top surface in the movable groove (24) have a certain distance respectively. The top end of the insertion joint (3) is connected to the bottom end of the telescopic tube (20). The elastic guide wire (22) is arranged outside the telescopic tube (20), one end of the elastic guide wire (22) is connected to the self-generating mechanism, and the other end is connected to the insertion joint (3).

6. The downhole self-powered signal transmission device according to claim 1, characterized in that: The inside shape of the receiving socket (4) matches the outside shape of the insertion joint (3).

7. The downhole self-powered signal transmission device according to claim 1, characterized in that: The side wall of the insertion joint (3) is provided with an upper magnetic attraction ring (27), and the receiving socket (4) is provided with a lower magnetic attraction ring (28) that cooperates with the upper magnetic attraction ring (27) for magnetic attraction connection.

8. A downhole self-powered signal transmission device according to any of claims 1-7, characterized in that, Further comprising: A releasing upper joint (29), a releasing sleeve (30), a spring claw (31), a limiting ring (32), and a shearing pin (33); The upper end of the lower body (2) is connected to the releasing sleeve (30); The bottom end of the releasing upper joint (29) is provided with a spring claw (31), the inside wall of the releasing sleeve (30) is provided with a clamping groove that cooperates with the spring claw (31), and the spring claw (31) is inserted into the inside of the clamping groove; The limiting ring (32) is arranged between the outside wall of the lower body (2) and the corresponding inside wall of the releasing sleeve (30), the upper end of the limiting ring (32) is between the spring claw (31) and the lower body (2), and the limiting ring (32) and the releasing sleeve (30) are connected by a shearing pin (33); The outside wall of the lower body (2) is provided with a step (34), and the limiting ring (32) is above the step (34) and has a certain distance from the step (34).

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