Underground self-energized signal transmission device

Abstract

The invention relates to the technical field of oil production engineering, in particular to an underground self-energized signal transmission device. The underground self-energized signal transmission device is characterized in that the bottom end of an upper main body is connected with an insertion joint; a self-power-generating mechanism used for generating electric energy through well fluid is arranged in the upper body and connected with the inserting connector. A receiving socket matched with the insertion joint is arranged in the lower main body; a signal transmitting assembly connected with a ground controller is arranged in the insertion connector, a signal receiving assembly connected with the underground measurement and control integrated bottom-hole regulator is arranged in the receiving socket, and the signal transmitting assembly is used for receiving control signals transmitted by the ground controller and wirelessly transmitting the control signals to the signal receiving assembly. The butt joint device aims to solve the problems that an existing butt joint device conducts butt joint and sealing through a sealing ring and an inserted sealing section, the one-time butt joint success rate is low, the sealing ring is prone to damage and failure after being used many times, a circuit system is short-circuited, the function of a process pipe column fails, and a large amount of manpower and resources need to be consumed during maintenance.

Description

Technical Field

[0001] The invention relates to the technical field of oil production engineering, and in particular to an underground self-powered signal transmission device. Background Art

[0002] At present, the stratified production technology of domestic oil fields is gradually developing towards intelligence and automation. The cable stratified production technology developed at this stage is mostly connected to the downhole integrated measurement and control production distributor through the ground cable (38), and the downhole integrated measurement and control production distributor is controlled on the ground to collect downhole temperature, pressure, flow and other data in real time and directly control the downhole stratified flow. Since the oil well involves pump inspection operations, it is necessary to regularly lift and lower the pumping string. Therefore, the stratified production process string adopts a drop-hand design to meet the needs of the stratified production string that does not move during pump inspection operations. After the drop-hand is completed, the stratified production string is docked with the stratified production string by lowering the docking device to realize power supply and signal transmission for the downhole tools.

[0003] The secondary docking device currently used adopts the traditional O-ring plus inserted sealing section structure design. The sealing ring is easily damaged and fails during docking, which leads to sealing failure and circuit system short circuit, and then the function of the entire process pipe string fails. The success rate of single and multiple docking is low. At the same time, once the docking fails, the ground cannot effectively control the opening of the production distributor valve, so that the oil well cannot be produced normally, and other remedial measures cannot be taken. The entire pipe string can only be pulled out and re-constructed, which consumes a lot of manpower and material resources. Summary of the invention

[0004] The present invention proposes an underground self-powered signal transmission device to solve the problems that the existing docking device is docked and sealed by a sealing ring and an inserted sealing section, the success rate of one-time docking is low, and the sealing ring is easily damaged and failed after repeated use, resulting in a short circuit of the circuit system and failure of the process pipe column function, and a large amount of manpower and resources are required for maintenance.

[0005] According to one aspect of the present invention, there is provided a downhole self-powered signal transmission device, comprising: an upper body and a lower body; The bottom end of the upper body is connected to the insertion joint; A self-generating mechanism for generating electric energy through well fluid is disposed inside the upper body, and the self-generating mechanism is connected to the insertion joint; A receiving socket matching the insertion connector is disposed inside the lower body, and the receiving socket is used to receive and store the electric energy output by the self-generating mechanism transmitted through the insertion connector, and transmit it to the distributor; The insertion connector is internally provided with a signal transmitting component connected to a ground controller, and the receiving socket is internally provided with a signal receiving component connected to a downhole measurement and control integrated production distributor. The signal transmitting component is used to receive a control signal sent by the ground controller and transmit it wirelessly to the signal receiving component.

[0006] Preferably, the self-generating mechanism comprises: a central axis, 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; The upper support body, the first lower support body and the second lower support body are fixed inside the upper body, the top end of the middle axis is connected to the upper support body axis, the middle axis passes through the first lower support body, and the bottom end is connected to the second lower support body; An impeller is arranged on the middle shaft between the upper support body and the first lower support body; The upper support body is provided with a liquid outlet, and the side wall of the upper main body between the upper support body and the first lower support body is provided with a liquid inlet; The inner coil is fixed on the central axis 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 body between the first lower support body and the second lower support body; The first battery pack is respectively connected to the inner coil, the receiving socket and the signal transmitting component.

[0007] Preferably, a throat structure is provided inside the upper body between the impeller and the liquid inlet; The diameter of the passage at the throat is 5-10 mm.

[0008] Preferably, the body of the insertion joint is Y-shaped and hollow inside, and the upper end of the Y-shaped arm of the insertion joint is connected to the upper body; The plug-in connector is internally installed with a power output coil and the signal transmitting component; The power output coil is connected to the self-generating mechanism.

[0009] Preferably, the upper body and the insertion joint are connected via a telescopic connection mechanism, and the telescopic connection mechanism is used to enable the insertion joint to move upward or downward by a certain distance while the upper body and the insertion joint remain connected.

[0010] Preferably, the telescopic connection mechanism comprises: a pin column, a telescopic tube, a track pin and an elastic wire; The top end of the pin column is connected to the bottom end of the upper body, 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; The track pin is arranged on the inner side wall of the installation groove, and a movable groove is arranged on the side wall of the telescopic tube at a position corresponding to the track pin; One end of the track pin is inserted into the movable groove, and there is a certain distance between the track pin and the top surface of the movable groove; The top end of the insertion joint is connected to the bottom end of the telescopic tube; 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 of the elastic wire is connected to the insertion joint.

[0011] Preferably, the receiving socket is provided with a power input coil, a ring-shaped battery pack and the signal receiving component; The internal shape of the receiving socket matches the external shape of the insertion connector; The power input coil is connected to the annular battery pack, and the annular battery pack and the signal receiving component are respectively connected to the distributor via cables.

[0012] Preferably, an upper magnetic ring is provided on the side wall of the insertion connector, and a lower magnetic ring is provided on the receiving socket to cooperate with the upper magnetic ring for magnetic connection.

[0013] Preferably, it also includes: a release joint, a release jacket, a spring claw, a limit ring and a shear pin; The upper end of the lower body is connected to the throw-away jacket; A spring claw is provided at the bottom end of the release joint, and a slot matching the spring claw is provided on the inner side wall of the release jacket, and the spring claw is inserted into the slot; A limiting ring is provided between the outer side wall of the lower body and the inner side wall corresponding to the release sleeve, the upper end of the limiting ring is located between the spring claw and the lower body, and the limiting ring and the release sleeve are connected by a shear pin; A step is arranged on the outer side wall of the lower body, and the limiting ring is located above the step and has a certain distance from the step.

[0014] The present invention has at least the following beneficial effects: The present invention proposes an underground self-powered signal transmission device, which solves the problem of low docking reliability after the cable-based stratified oil production process is lost by arranging an insertion connector and a receiving socket as well as wireless signal transmitting and receiving components. It can transmit signals and supply power to the stratified production pipe string after the stratified production pipe string is lost, with a high docking success rate and improved process reliability. By arranging a self-generating mechanism, there is no need to provide additional power during use, thereby improving construction convenience and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings herein are incorporated into and constitute a part of the specification. These drawings illustrate embodiments consistent with the present invention and, together with the specification, are used to explain the technical solutions of the present invention.

[0016] Figure 1 A schematic structural diagram of an upper body of a downhole self-powered signal transmission device according to an embodiment of the present invention is shown; Figure 2 A schematic structural diagram of a lower body of a downhole self-powered signal transmission device according to an embodiment of the present invention is shown.

[0017] In the figure, 1-upper body, 2-lower body, 3-insertion connector, 4-receiving socket, 5-signal transmitting component, 6-signal receiving component, 7-central axis, 8-upper support body, 9-first lower support body, 10-second lower support body, 11-inner coil, 12-outer coil, 13-first battery pack, 14-impeller, 15-liquid outlet, 16-liquid inlet, 17-throat, 18-power output coil, 19-pin column, 20-telescopic tube, 21-track pin, 22-elastic wire, 23-mounting groove, 24-movable groove, 25-power input coil, 26-annular battery pack, 27-upper magnetic ring, 28-lower magnetic ring, 29-hand-release upper connector, 30-hand-release jacket, 31-spring claw, 32-limiting ring, 33-shear pin, 34-step, 35-bearing, 36-sealing jacket, 37-sealing screw, 38-cable. Implementation

[0018] Various exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0019] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0020] The term "and / or" herein is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "at least one" herein represents any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C can represent including any one or more elements selected from the set consisting of A, B, and C.

[0021] In addition, in order to better illustrate the present invention, numerous specific details are provided in the following specific embodiments. It should be understood by those skilled in the art that the present invention can be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present invention.

[0022] Figure 1 A schematic structural diagram of an upper body of a downhole self-powered signal transmission device according to an embodiment of the present invention is shown; Figure 2 The following is a schematic diagram showing the structure of the lower body of the underground self-powered signal transmission device according to an embodiment of the present invention. Figure 1 and 2 As shown, a downhole self-powered signal transmission device comprises: an upper main body 1 and a lower main body 2; the bottom end of the upper main body 1 is connected to an insertion connector 3; a self-generating mechanism for generating electric energy through well fluid is arranged inside the upper main body 1, and the self-generating mechanism is connected to the insertion connector 3; a receiving socket 4 matching the insertion connector 3 is arranged inside the lower main body 2, and the receiving socket 4 is used to receive and store the electric energy output by the self-generating mechanism transmitted through the insertion connector 3, and transmit it to a production distributor; a signal transmitting component 5 connected to a ground controller is arranged inside the insertion connector 3, and a signal receiving component 6 connected to a downhole measurement and control integrated production distributor is arranged inside the receiving socket 4, and the signal transmitting component 5 is used to receive a control signal sent by the ground controller, and transmit it wirelessly to the signal receiving component 6.

[0023] In an embodiment of the present invention, during construction, a pipe string containing a production distributor, a packer and a lower body 2 is lowered into the target position downhole. Hydraulic pressure is added to the oil pipe to seal 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 it reaches the top of the lower body 2, the insertion joint 3 at the bottom is gradually inserted downward into the receiving socket 4 of the lower body 2, thereby completing the docking. When in use, the self-generating mechanism inside the upper body 1 generates electricity under the action of the well fluid, and the generated electric energy is transmitted to the production distributor through the insertion joint 3 and the receiving socket 4 for power supply; at the same time, the signal transmitting component 5 in the insertion joint 3 is connected to the self-generating mechanism, and the signal receiving component 6 in the receiving socket 4 is connected to the receiving socket 4. The electric energy generated by the self-generating mechanism will be transmitted to the signal transmitting component 5 for power supply, and at the same time, it will be transmitted to the signal receiving component 6 through the receiving socket 4 for power supply.

[0024] When the production distributor is being regulated, the ground controller sends a control signal to the signal transmitting component 5. The signal transmitting component 5 is connected to the signal receiving component 6 through a wireless transmission module. The signal transmitting component 5 transmits the control signal to the signal receiving component 6 wirelessly. After the signal receiving component 6 receives the control signal, it controls the production distributor to measure and adjust through the internal control circuit. The wireless transmission of the control signal can be realized through the signal transmitting component 5 and the signal receiving component 6. The control circuit is set in the signal receiving component 6, which can realize the measurement and adjustment of the production distributor in the well, and set the timing to start and debug the production distributor according to the on-site situation. The signal transmitting component 5 and the signal receiving component 6 can realize that when the insertion connector 3 and the receiving socket 4 fail to dock, the production distributor is turned on by the timing instruction of the built-in control circuit of the signal receiving component 6 to realize the measurement and adjustment of the production distributor, which does not affect the subsequent production, and can effectively avoid the problem of being unable to debug the production distributor due to docking failure during wired connection or corrosion of well fluid, broken cables, etc.

[0025] In the present invention, the self-generating mechanism comprises: a central axis 7, an upper support body 8, a first lower support body 9, a second lower support body 10, an inner coil 11, an outer coil 12 and a first battery pack 13; the upper support body 8, the first lower support body 9 and the second lower support body 10 are fixed inside the upper body 1, the top end of the central axis 7 is connected to the upper support body 8 axis, the central axis 7 passes through the first lower support body 9, and the bottom end is connected to the second lower support body 10; the upper end of the central axis 7 between the upper support body 8 and the first lower support body 9 An impeller 14 is provided; a liquid outlet 15 is provided on the upper support body 8, and a liquid inlet 16 is provided on the side wall of the upper main body 1 between the upper support body 8 and the first lower support body 9; the inner coil 11 is fixed on the central axis 7 between the first lower support body 9 and the second lower support body 10, and the outer coil 12 is fixed on the inner side wall of the upper main body 1 between the first lower support body 9 and the second lower support body 10; the first battery pack 13 is respectively connected to the inner coil 11, the receiving socket 4 and the signal transmitting component 5.

[0026] In the embodiment of the present invention, inside the upper body 1, the space between the upper support body 8 and the first lower support body 9 is a power generation chamber, the top end of the central axis 7 is connected to the upper support body 8 through a bearing 35 and a screw shaft, and the side wall is connected to the first lower support body 9 through a bolt and a bearing 35, and the central axis 7 can rotate along the axis. A plurality of liquid outlets 15 are provided on the upper support body 8; the impeller 14 is located close to the upper support body 8, and the impeller 14 is provided in two layers along the outer side wall of the central axis 7; a plurality of liquid inlets 16 are provided on the side wall of the upper support body 8 in the power generation chamber, and the position is close to the first lower support body 9.

[0027] Inside the upper main body 1, the space between the first lower support body 9 and the second lower support body 10 is a sealed chamber, and the side wall of the central axis 7 is connected to the second lower support body 10 axis through bolts and bearings 35; an inner coil 11 is sleeved on the bearing 35 in the sealed chamber, and an outer coil 12 is arranged on the side wall in the sealed chamber.

[0028] The first battery pack 13 is arranged between the second lower support body 10 and the insertion connector 3. When generating electricity, the well fluid enters the power generation chamber through the liquid inlet 16, moves upward along the central axis 7, and when it reaches the impeller 14, it drives the impeller 14 to rotate, and the impeller 14 drives the central axis 7 to rotate, and the central axis 7 drives the inner coil 11 to rotate, and cooperates with the outer coil 12 to generate electricity using the electromagnetic induction principle, and transmits the electric energy to the first battery pack 13. The first battery pack 13 stores the electric energy and transmits it to the receiving socket 4 through the insertion connector 3, and transmits it to the distributor through the receiving socket 4 for power supply. At the same time, the first battery pack 13 transmits the electric energy to the signal transmitting component 5 for power supply, and transmits the electric energy to the signal receiving component 6 through the insertion connector 3 and the receiving socket 4 for power supply.

[0029] In the present invention, a throat 17 structure is provided inside the upper body 1 between the impeller 14 and the liquid inlet 16; the diameter of the channel at the throat 17 is 5-10 mm.

[0030] In the embodiment of the present invention, the throat 17 is structured such that an inner wall of the upper body 1 and an outer wall of the corresponding central axis 7 respectively have arc-shaped protruding portions, and the distance between the two protruding portions is relatively narrow, with the shortest distance being 5-10 mm.

[0031] When the oil pump is pumping oil, the fluid in the well moves upward at a certain velocity. After the well fluid enters the upper main body 1 from the liquid inlet 16, it moves upward to the throat 17 structure. When passing through the throat 17, the flow velocity is increased again due to the narrowing of the channel, which accelerates the impeller 14 to drive the central shaft 7 and the inner coil 11 to rotate, thereby achieving the effect of improving the power generation capacity.

[0032] In the present invention, the main body of the insertion connector 3 is Y-shaped and hollow inside, and the upper end of the Y-shaped arm of the insertion connector 3 is connected to the upper main body 1; the power output coil 18 and the signal transmitting component 5 are installed inside the insertion connector 3; the power output coil 18 is connected to the self-generating mechanism.

[0033] In the embodiment of the present invention, the power output coil 18 is connected to the first battery pack 13 and the signal transmitting component 5 respectively; wherein the signal transmitting component 5 is located near the bottom of the Y-shaped hollow interior of the insertion connector 3, the power output coil 18 is located above the signal transmitting component 5, and the material of the insertion connector 3 is an insulating material. When the insertion connector 3 is connected to the receiving socket 4, the power of the first battery pack 13 is transmitted to the power output coil 18, and the power output coil 18 transmits the power to the receiving socket 4. The first battery pack 13 is connected to transmit the power to the signal transmitting component 5.

[0034] In the present invention, the upper body 1 and the insertion joint 3 are connected via a telescopic connection mechanism, and the telescopic connection mechanism is used to enable the insertion joint 3 to move a certain distance upward or downward while the upper body 1 and the insertion joint 3 remain connected.

[0035] In the embodiment of the present invention, during the oil production process, the pipe column will be continuously extended and retracted due to the influence of pumping, and the length of the pipe column will change. After the insertion joint 3 of the upper body 1 and the receiving socket 4 of the lower body 2 are docked, when the oil pipe is pumping oil, the insertion joint 3 may be frequently moved to form a gap between the insertion joint 3 and the receiving socket 4, affecting the transmission of signals and electric energy of the signal transmission component. Through the telescopic effect of the telescopic connection mechanism, the insertion joint 3 is kept connected to the upper body 1 and the first battery pack 13 while having a certain upward and downward movement space. When the upper body 1 moves slightly upward, the insertion joint 3 is always kept inside the receiving socket 4, eliminating the influence of the creeping of the oil pipe on the docking of the insertion joint 3 and the receiving socket 4, and ensuring the stability of signal transmission.

[0036] In the present invention, the telescopic connection mechanism includes: a pin column 19, a telescopic tube 20, a track pin 21 and an elastic wire 22; the top end of the pin column 19 is connected to the bottom end of the upper body 1, and a mounting groove 23 is arranged at the bottom end of the pin column 19, and the top end of the telescopic tube 20 is inserted into the mounting groove 23; the track pin 21 is arranged on the inner side wall of the mounting groove 23, and a movable groove 24 is arranged on the side wall of the telescopic tube 20 at a position corresponding to the track pin 21; one end of the track pin 21 is inserted into the movable groove 24, and a certain distance is respectively provided between the track pin 21 and the top surface in the movable groove 24; the top end of the insertion joint 3 is connected to the bottom end of the telescopic tube 20; the elastic wire 22 is arranged outside the telescopic tube 20, one end of the elastic wire 22 is connected to the self-generating mechanism, and the other end is connected to the insertion joint 3.

[0037] In the embodiment of the present invention, the interior of the telescopic tube 20 is hollow, which is convenient for reducing the weight of the device; after the telescopic tube 20 is inserted into the installation groove 23, it is connected to the pin column 19 through the track pin 21. There is a certain distance between one end of the track pin 21 and the top and bottom of the movable groove 24. When the top of the telescopic tube 20 contacts the top of the installation groove 23, the track pin 21 is located near the middle position in the movable groove 24. The elastic wire 22 is spiral and is sleeved on the outside of the telescopic tube 20.

[0038] A sealing sleeve 36 is provided on the outer sea sleeve of the pin column 19 and the telescopic tube 20, and the inner wall of the sealing sleeve 36 near the top is connected to the outer wall of the pin column 19 by threads; the upper end of the insertion joint 3 is inserted into the interior of the sealing sleeve 36 from the bottom opening thereof, and the outer wall of the part of the insertion joint 3 in the sealing sleeve 36 is tightly fitted with the inner wall of the sealing sleeve 36.

[0039] When the insertion connector 3 is docked with the receiving socket 4, the pipe column expands and contracts, causing the upper body 1, the pin column 19 and the sealing sleeve 36 to shake up and down; when the upper body 1 and the pin column 19 move upward, the track pin 21 moves toward the top of the movable groove 24. At this time, the telescopic tube 20 is stably inserted in the receiving socket 4 due to the gravity of itself and the connected insertion connector 3, and the position does not move up and down; the elastic wire 22 extends or shortens when the distance between the pin column 19 and the insertion connector 3 increases or decreases, thereby ensuring the stability of signal transmission in the insertion connector 3. Among them, the length of the part of the insertion connector 3 in the sealing sleeve 36 needs to be greater than the distance between the track pin 21 and the top of the movable groove 24 when the top of the telescopic tube 20 is close to the top of the installation groove 23, so as to prevent the insertion connector 3 from detaching from the sealing sleeve 36 when the telescopic tube 20 extends downward from the installation groove 23 to the maximum length.

[0040] When the upper body 1 is lowered or removed and the insertion joint 3 is separated from the receiving socket 4, the upper body 1 is driven to move by the pipe column, and the upper body 1 is stuck in the movable groove 24 through the pin column 19 and the track pin 21, thereby driving the telescopic tube 20 and the insertion joint 3 to move.

[0041] In the present invention, the interior of the receiving socket 4 is provided with a power input coil 25, an annular battery pack 26 and the signal receiving component 6; the internal shape of the receiving socket 4 matches the external shape of the insertion connector 3; the power input coil 25 is connected to the annular battery pack 26, and the annular battery pack 26 and the signal receiving component 6 are respectively connected to the dispenser via a cable 38.

[0042] In an embodiment of the present invention, the receiving socket 4 is a cylinder with an annular battery pack 26 arranged inside, a power input coil 25 arranged above the annular battery pack 26, and a signal receiving component 6 arranged below; the shape of the hollow interior formed by the annular battery pack 26, the power input coil 25 and the signal receiving component 6 matches the external shape of the insertion connector 3; the top end of the receiving insert is arranged as an inclined surface gradually downward from the outside to the inside, so that the bottom end of the insertion connector 3 can slide more easily into the interior of the receiving socket 4 along the inclined surface when it contacts the top end of the receiving insert.

[0043] The bottom end of the receiving socket 4 is connected to the sealing end cover, and a pressure cap is arranged below the sealing end cover; one end of the cable 38 is inside the pressure cap, and the cable 38 is fixed to the sealing end cover by a sealing screw 37, and one end of the cable 38 passes through the sealing end cover to be connected with the signal receiving component 6 and the annular battery pack 26.

[0044] When the bottom end of the insertion connector 3 is inserted into the hollow interior of the receiving socket 4, the positions of the power input coil 25 and the power output coil 18 correspond, and the positions of the signal transmitting component 5 and the signal receiving component 6 correspond; the power output coil 18 outputs electric energy, and transmits the electric energy 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 component 6 for power supply and transmits it to the distributor through the cable 38 for power supply.

[0045] When the insertion connector 3 and the receiving socket 4 fail to dock, the timing program built into the signal receiving component 6 can complete the start of the dispenser to ensure that the dispenser can achieve normal measurement and adjustment functions.

[0046] Before going down the well, the first battery pack 13 and the annular battery pack 26 have pre-stored electrical energy. When the insertion connector 3 and the receiving socket 4 fail to dock and the distance between the power input and output coils is too far, they can still provide electrical energy for the signal transmitting and receiving components and test and adjust the distributor.

[0047] In the present invention, an upper magnetic ring 27 is provided on the side wall of the insert connector 3 , and a lower magnetic ring 28 that cooperates with the upper magnetic ring 27 and is magnetically connected to the receiving socket 4 is provided.

[0048] In an embodiment of the present invention, an upper magnetic ring 27 is provided at the bottom of the two Y-shaped arms of the insertion connector 3, and a lower magnetic ring 28 is provided on the top inclined surface of the receiving socket 4; when the insertion connector 3 is docked with the receiving socket 4, the upper magnetic ring 27 and the lower magnetic ring 28 correspond in position, and are adsorbed together due to magnetic fit, so that the two are fixed by magnetic attraction, thereby improving the stability of docking and signal transmission.

[0049] The present invention also includes: a release joint 29, a release jacket 30, a spring claw 31, a limit ring 32 and a shear pin 33; the upper end of the lower body 2 is connected to the release jacket 30; the bottom end of the release joint 29 is provided with a spring claw 31, and the inner side wall of the release jacket 30 is provided with a slot that cooperates with the spring claw 31, and the spring claw 31 is inserted into the slot; a limit ring 32 is provided between the outer side wall of the lower body 2 and the inner side wall corresponding to the release jacket 30, the upper end of the limit ring 32 is located between the spring claw 31 and the lower body 2, and the limit ring 32 and the release jacket 30 are connected by the shear pin 33; a step 34 is provided on the outer side wall of the lower body 2, and the limit ring 32 is located above the step 34 and has a certain distance from the step 34.

[0050] In the embodiment of the present invention, the upper end of the lower body 2 is inserted into the inside of the release jacket 30 from the bottom end thereof, and is connected to the release jacket 30 by a thread; a step 34 is provided on the side wall of the lower body 2 in the release jacket 30, and an annular space is formed between the lower body 2 above the step 34 and the release jacket 30; a limiting ring 32 is sleeved on the outside of the lower body 2, and is located in the annular space, and a certain distance is formed between the bottom end of the limiting ring 32 and the bottom of the annular space. The inner wall of the limiting ring 32 is in close contact with the lower body 2, and part of the outer wall of the limiting ring 32 is in close contact with the inner wall of the release sleeve 30; a slot is set on the inner wall of the release sleeve 30 corresponding to the limiting ring 32, and the bottom end of the spring claw 31 is inserted downward from the top of the limiting ring 32 between the limiting ring 32 and the release sleeve 30, and the protruding part of the outer side of the bottom end of the spring claw 31 is inserted into the inside of the slot; the limiting ring 32 and the spring claw 31 are tightly fitted, and the spring claw 31 is squeezed and stuck in the inside of the slot, and cannot move upward, thereby realizing the connection and fixation between the release joint 29 and the release sleeve 30.

[0051] During construction, the release joint 29 is connected to the oil pipe, and the release joint 29 and the lower body 2 are lowered into the target position downhole along with the production device and the packer through the oil pipe. After the packer is sealed, the inside of the oil pipe is pressurized, and the liquid enters the inside of the release sleeve 30 through the release joint 29. When it reaches the top of the limit ring 32, as the pressure increases, the limit ring 32 is pushed to cut off the shear pin 33 and move downward, that is, toward the bottom of the annular space; when the limit ring 32 is away from the bottom end of the spring claw 31, the spring claw 31 slides out of the slot and detaches from the release sleeve 30, and the oil pipe drives the release joint 29 and the spring claw 31 upward and away from the release sleeve 30, thereby completing the release.

[0052] It can be understood that the above-mentioned various embodiments mentioned in the present invention can be combined with each other to form a combined embodiment without violating the principle logic. Due to space limitations, the present invention will not go into details.

[0053] The present invention provides a downhole self-powered signal transmission device, which solves the problem of low docking reliability after the cabled stratified oil production process is lost, and can transmit signals and supply power to the stratified production column after the sealing is lost, and can cope with various unexpected docking failures, thereby improving process reliability. By providing a self-generating mechanism and a battery pack for energy supply and energy storage, no additional power supply is required during measurement and adjustment, thereby improving construction convenience and safety; the inserted connector 3 and the receiving socket 4 provided can achieve repeated reliable docking after the cabled stratified oil production process is lost, thereby avoiding the failure of the entire process column due to docking failure, thereby improving the process success rate; the power supply and control signal transmission are both transmitted and received wirelessly, and are not affected by the well fluid; a telescopic connection mechanism is used to eliminate the influence of the creeping of the pumping column and the telescopic expansion of the column on signal transmission during the oil production process; it has a timing switch function, and has the ability to handle emergency opening of the production distributor valve.

[0054] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A downhole self-powered signal transmission device, characterized in that: include: an upper body (1) and a lower body (2); The bottom end of the upper body (1) is connected to the insertion joint (3); A self-generating mechanism for generating electric energy through well fluid is provided inside the upper body (1), and the self-generating mechanism is connected to the insertion joint (3); A receiving socket (4) matching the insertion connector (3) is arranged inside the lower body (2), and the receiving socket (4) is used to receive and store the electric energy output by the self-generating mechanism transmitted through the insertion connector (3), and transmit it to the distributor; The insertion joint (3) is internally provided with a signal transmitting component (5) connected to a ground controller, and the receiving socket (4) is internally provided with a signal receiving component (6) connected to a downhole measurement and control integrated production distributor. The signal transmitting component (5) is used to receive a control signal sent by the ground controller and transmit it wirelessly to the signal receiving component (6).

2. The underground self-powered signal transmission device according to claim 1, characterized in that: The self-generating mechanism comprises: a central axis (7), an upper support body (8), a first lower support body (9), a second lower support body (10), an inner coil (11), an outer coil (12), and a first battery group (13); The upper support body (8), the first lower support body (9) and the second lower support body (10) are fixed inside the upper body (1); the top end of the middle axis (7) is connected to the axis of the upper support body (8); the middle axis (7) passes through the first lower support body (9) and the bottom end is connected to the second lower support body (10); An impeller (14) is provided on the central shaft (7) between the upper support body (8) and the first lower support body (9); The upper support body (8) is provided with a liquid outlet (15), and the side wall of the upper main body (1) between the upper support body (8) and the first lower support body (9) is provided with a liquid inlet (16); The inner coil (11) is fixed on the central axis (7) between the first lower support body (9) and the second lower support body (10), and the outer coil (12) is fixed on the inner side wall of the upper body (1) between the first lower support body (9) and the second lower support body (10); The first battery pack (13) is respectively connected to the inner coil (11), the receiving socket (4) and the signal transmitting component (5).

3. The underground self-powered signal transmission device according to claim 1, characterized in that: A throat (17) structure is provided 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.

4. The underground self-powered signal transmission device according to claim 1, characterized in that: The body of the insertion joint (3) is Y-shaped and hollow inside, and the upper end of the Y-shaped arm of the insertion joint (3) is connected to the upper body (1); The insertion connector (3) has a power output coil (18) and the signal transmitting component (5) installed inside; The power output coil (18) is connected to the self-generating mechanism.

5. The underground self-powered signal transmission device according to claim 1, characterized in that: The upper body (1) and the insertion joint (3) are connected via a telescopic connection mechanism, and the telescopic connection mechanism is used to enable the insertion joint (3) to move upward or downward by a certain distance while the upper body (1) and the insertion joint (3) remain connected.

6. The underground self-powered signal transmission device according to claim 5, characterized in that: The telescopic connection mechanism comprises: a pin column (19), a telescopic tube (20), a track pin (21) and an elastic wire (22); The top end of the pin column (19) is connected to the bottom end of the upper body (1), a mounting groove (23) is provided at the bottom end of the pin column (19), and the top end of the telescopic tube (20) is inserted into the mounting groove (23); The track pin (21) is arranged on the inner side wall of the installation groove (23), and a movable groove (24) is arranged on the side wall of the telescopic tube (20) at a position corresponding to the track pin (21); One end of the track pin (21) is inserted into the movable groove (24), and a certain distance exists between the track pin (21) and the top surface of the movable groove (24); The top end of the insertion joint (3) is connected to the bottom end of the telescopic tube (20); The elastic wire (22) is arranged outside the telescopic tube (20), one end of the elastic wire (22) is connected to the self-generating mechanism, and the other end is connected to the insertion connector (3).

7. The underground self-powered signal transmission device according to claim 1, characterized in that: The receiving socket (4) is provided with a power input coil (25), a ring-shaped battery pack (26) and the signal receiving component (6) inside; The internal shape of the receiving socket (4) matches the external shape of the insertion connector (3); The power input coil (25) is connected to the annular battery pack (26), and the annular battery pack (26) and the signal receiving component (6) are respectively connected to the dispenser via cables (38).

8. The underground self-powered signal transmission device according to claim 1, characterized in that: An upper magnetic ring (27) is provided on the side wall of the insertion connector (3), and a lower magnetic ring (28) is provided on the receiving socket (4) and is magnetically connected to the upper magnetic ring (27).

9. The underground self-powered signal transmission device according to any one of claims 1 to 8, characterized in that: Also includes: A release joint (29), a release jacket (30), a spring claw (31), a stop ring (32) and a shear pin (33); The upper end of the lower body (2) is connected to the throw-away jacket (30); A spring claw (31) is provided at the bottom end of the release joint (29), a slot cooperating with the spring claw (31) is provided on the inner side wall of the release cover (30), and the spring claw (31) is inserted into the slot; A limit ring (32) is provided between the outer wall of the lower body (2) and the inner wall corresponding to the release sleeve (30), the upper end of the limit ring (32) is located between the spring claw (31) and the lower body (2), and the limit ring (32) and the release sleeve (30) are connected via a shear pin (33); A step (34) is provided on the outer side wall of the lower body (2), and the limiting ring (32) is located above the step (34) and has a certain distance from the step (34).

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