Composite coiled tubing and downhole in-situ micro hydraulic station power line carrier connection device

Abstract

The application belongs to the field of oil and gas well exploitation, and discloses a power line carrier connection device of a composite continuous tube and a downhole in-situ micro hydraulic station, which comprises a ground side and a downhole side carrier module and a downhole power line bundle connection device. The connection device comprises a sealing unit, an insulation unit and a flexible quick plug unit. The sealing unit is composed of axial sealing, circumferential sealing and combined sealing. The insulation unit is composed of an electrically glued wood ring, a filler, an insulation sleeve and a pipeline sleeve. The downhole side power line bundle is transmitted through the composite continuous tube, a switching conductor rod and a flexible jaw mechanism to realize quick plugging. The downhole hydraulic station power line bundle is connected to the jaw base. After the completion of the connection of the power line bundle connection device, according to the true connection state of the power line carrier transmission device, the downhole side is placed in a high temperature environment, the ground and downhole side carrier module receiving end resistors are adjusted to avoid signal echo interference, and the carrier module capacitor is adjusted to match the signal transmission distance, so as to realize the stable transmission of power and signal of the power line carrier connection device.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of oil exploitation, and particularly relates to a power line carrier connection device of a composite continuous pipe and a downhole in-situ micro hydraulic station. BACKGROUND

[0002] In the process of oil and gas well exploitation, the crude oil exploitation device is located at a position of thousands of meters underground, and the working environment is narrow, high temperature and high pressure, and complex and relatively harsh. With the increase of inclined wells, horizontal wells, deep wells and heavy oil wells, flexible continuous casing has more advantages than traditional metal steel pipes in power and signal transmission. Flexible composite continuous pipes are widely used in oil drilling, well completion, well testing, oil production and gathering and transportation, etc., to realize the functions of power and signal transmission for downhole operation and real-time control on the ground. Therefore, flexible composite continuous pipes that adapt to complex environments are usually selected as deep well power and signal transmission devices.

[0003] With the development of domestic oil exploitation technology, the number of devices that realize special functional requirements is increasing. Therefore, it is necessary to divert a separate cable from the flexible composite continuous pipe layer to power and signal control the device. In the high temperature and high pressure downhole environment, the above-mentioned diverted cable needs to be sleeved with a cable connection device as an electric power line carrier connection device with insulation, sealing, high pressure resistance and high temperature resistance.

[0004] At present, the cable connection device has two problems: first, the traditional cable connection device is suitable for ordinary power transmission. When signal transmission in the case of variable distance and signal interference is involved, signal distortion and unstable transmission may occur, causing interruption of signal control. Second, the insulation and sealing performance of the electric contact working environment of the traditional cable connection device in the complex environment of the oil well is always a difficult problem under the conditions of increasing pressure and temperature, and needs to be continuously improved. Therefore, it is urgent to invent a power line carrier connection device for a composite continuous pipe and a downhole in-situ micro hydraulic station to improve the stability and safety of the ground downhole power signal transmission, which is of great significance. SUMMARY

[0005] To address the shortcomings of existing technologies, in-depth research revealed that the key reason lies in the different contact methods between the surface and underground components, which affect signal transmission. Given the high temperature and pressure environment downhole, the outer casing of the downhole components bears the high pressure, while the internal components of the power line carrier connection device, such as the wiring harness, conductors, carrier module, resistors, capacitors, and inductors, do not bear pressure. Therefore, this invention innovatively proposes a power line carrier connection device for composite continuous tubing and an in-situ micro hydraulic station downhole. A novel flexible claw mechanism with double flexible hinges is constructed to achieve docking. An adjustable capacitor and adjustable resistor are connected in series in the power and carrier signal transmission circuit, constructing a distance-adjustable carrier communication module for stable signal transmission. The capacitors, resistors, and inductors are adjusted based on the actual connection status and high-temperature environment of the power line carrier connection device. The purpose of this invention is to provide a power line carrier connection device for composite continuous tubing and an in-situ micro hydraulic station downhole, operating under high-temperature conditions and with stable and reliable power and signal transmission.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A power line carrier connection device for a composite continuous tubing and a downhole in-situ micro hydraulic station, with wiring via the composite continuous tubing, is characterized by comprising: a ground side including a ground carrier module, wherein the transmitting end of the ground carrier module is connected in series with a first adjustable capacitor and the receiving end is connected in series with a first adjustable resistor; a downhole side including a downhole downhole wave module, wherein the transmitting end of the downhole downhole wave module is connected in series with a second adjustable capacitor and the receiving end is connected in series with a second adjustable resistor; and a downhole power line harness connection device, wherein the transmitting end and receiving end of the ground carrier module and the receiving end and transmitting end of the downhole downhole wave module respectively communicate half-duplex signals through the downhole power line harness connection device.

[0008] Preferably, the downhole power harness connection device is disposed between the downhole power harness shunt end and the downhole micro hydraulic station power harness lead-out end, including a conductor rod and two power harness connection units. The two power harness connection units are respectively a power harness connection unit from the shunt end to the conductor rod and a unit from the conductor rod to the downhole micro hydraulic station power harness lead-out end. The two power harness connection units are detachably connected to each other at their ends and are symmetrically arranged, and are respectively used for electrical connection with the power harness at the shunt end and the power harness of the downhole micro hydraulic station. The conductor rod is used to electrically connect the two power harness connection units.

[0009] Furthermore, the power harness connection unit includes a flexible mating unit, which includes a spun-sealed cylinder and a flexible claw mechanism disposed within the spun-sealed cylinder. The flexible claw mechanism has a claw base and multiple flexible claws formed on one side of the claw base. The power harness of the shunt end / downhole in-situ micro hydraulic station is welded to the other side of the claw base. The multiple flexible claws are arranged in a circumferential array and are centrally symmetrical to form a mating position. The flexible claws are elastic along the radial direction of the mating position. The mating position is used to insert conductor rods.

[0010] Furthermore, the flexible claw has a bidirectional flexible hinge portion and a unidirectional flexible hinge portion. Both the bidirectional and unidirectional flexible hinge portions are formed by the flexible claw being recessed radially along the insertion position. The bidirectional flexible hinge portion is located at the root of the flexible claw, so that the flexible claw is integrated with the claw base through the bidirectional flexible hinge portion. The concave part of the bidirectional flexible hinge portion is formed on opposite sides of the flexible claw and is symmetrical, while the concave part of the unidirectional flexible hinge portion is formed on one side of the flexible claw located within the insertion position.

[0011] Furthermore, the bidirectional flexible hinge portion is concave to form an arc surface, and the thickness ratio of the bidirectional flexible hinge portion to the adjacent flexible claw portion is no greater than 10%. The unidirectional flexible hinge portion is concave to form an arc surface, and the thickness ratio of the unidirectional flexible hinge portion to the adjacent flexible claw portion is no greater than 10%.

[0012] Furthermore, the power harness connection unit also includes an insulation unit. The insulation unit is used to insulate the power harness of the shunt end / downhole in-situ micro hydraulic station. It includes a first insulating cylinder, an inner insulating sleeve, a second insulating cylinder, and insulation components. The first insulating cylinder, the inner insulating sleeve, and the second insulating cylinder are all open at both ends. The conductor rod passes sequentially through the first insulating cylinder and the second insulating cylinder. The two power harness connection units are connected via their respective first insulating cylinder flanges. The inner insulating sleeve is fitted inside the first insulating cylinder, and the conductor rod passes through the inner insulating sleeve inside the first insulating cylinder. One end of the second insulating cylinder is connected to the first insulating cylinder as a connection end; the other end is detachably connected to the spun-sealed cylinder via threads. The insulating assembly includes multiple phenolic resin rings, insulating filler, and insulating retaining rings, with an inwardly protruding stop flange near the opening at the connecting end. The multiple phenolic resin rings are parallel to each other and located within a second insulating cylinder, with the outer edge of the phenolic resin rings larger than the stop flange, thus stopping the phenolic resin rings within the second insulating cylinder. The phenolic resin rings have multiple wire-passing holes through which the conductor rod passes. The insulating filler is filled between any two adjacent phenolic resin rings. The insulating retaining ring is located between the second insulating cylinder and the spun-sealed cylinder, and the phenolic resin rings, insulating filler, and insulating retaining ring are all sealed and fitted together. The first and second insulating cylinders withstand high pressure on the downhole side, while the power harness and conductor rod of the shunt end / downhole in-situ micro hydraulic station withstand normal pressure.

[0013] Furthermore, the power harness connection unit also includes a sealing assembly, comprising a first axial sealing ring, a first circumferential sealing ring, a second axial sealing ring, and a second circumferential sealing ring. The first axial sealing ring is circumferentially sealed between the first insulating cylinder and the insulating inner sleeve. The first circumferential sealing ring is circumferentially sealed between the first insulating cylinder and the second insulating cylinder. The second insulating cylinder and the spun sealing cylinder are threaded together to form a mating threaded surface and a mating abutment surface, and the threaded surface and the abutment surface are perpendicular to each other. The second axial sealing ring is circumferentially sealed between the cylindrical surfaces below the threaded surface of the second insulating cylinder. The second circumferential sealing ring is circumferentially sealed between the abutment surfaces of the second insulating cylinder.

[0014] Preferably, the surface side further includes a surface power supply, a surface coupling filter, and a first adjustable inductor, while the downhole side further includes a downhole power supply, a downhole coupling filter, and a second adjustable inductor. The first adjustable inductor, the surface coupling filter, the surface power supply, the surface carrier module, the second adjustable inductor, the downhole coupling filter, the downhole power supply, and the downhole carrier module are connected in series to form a loop.

[0015] A method for debugging the mechanical part of the power signal transmission of an in-situ micro hydraulic station in a well, characterized by comprising the following steps:

[0016] Step C1: Insert the power harness of the split-end / downhole in-situ micro hydraulic station into the corresponding spinning sealing cylinder and weld it to the claw base. The split-end / downhole in-situ micro hydraulic station is the above-mentioned surface / downhole downhole wave module, and the spinning sealing cylinder and claw base are the above-mentioned spinning sealing cylinder and claw base.

[0017] Step C2: The second insulating cylinder and the first insulating cylinder are sequentially placed on the spun sealing cylinder, so that the wire passage hole corresponds to the plug-in position, and the wire passage hole is connected to the insulating inner sleeve; the first insulating cylinder, the second insulating cylinder, the wire passage hole, the plug-in position and the insulating inner sleeve are the first insulating cylinder, the second insulating cylinder, the wire passage hole, the plug-in position and the insulating inner sleeve mentioned above.

[0018] Step C3: Insert the conductor rod into the plug-in position through the insulating inner sleeve and the wire hole in sequence, and connect it with the two first insulating cylinders. The conductor rod is the one described above.

[0019] The above-mentioned method for debugging the mechanical part of the power signal transmission of an in-situ micro hydraulic station in a well is characterized by a waveform debugging method for the power signal transmission of the well in a high-temperature and high-pressure environment, and includes the following steps:

[0020] Step E1: Start the ground carrier module and the well-ground waveform module, and use two spectrum analyzers (not shown in the attached figure) to obtain the transmitting waveform and corresponding signal energy of the ground carrier module and the receiving waveform and corresponding signal energy, respectively.

[0021] Step E2: Adjust the first adjustable resistor and / or the second adjustable resistor to absorb the echo of the transmitted signal, and return to step E3;

[0022] Step E3: Detect the received signal wave and the reflected signal echo from the transmitted signal wave in the received waveform;

[0023] Step E4: Determine whether the signal energy of the reflected signal echo is less than 10% of the signal energy of the received signal wave. If yes, continue to step E5; otherwise, return to step E2.

[0024] Step E5: After adjusting the first adjustable capacitor and / or the second adjustable capacitor to reduce signal loop loss, return to step E6;

[0025] Step E6: Detect the transmitted signal wave from the transmitted waveform;

[0026] Step E7: Determine that the waveform similarity between the received signal wave and the transmitted signal wave is 75%-85%. If yes, proceed to step E8; otherwise, proceed to step E5.

[0027] Step E8: After adjusting the first adjustable capacitor and / or the second adjustable capacitor to reduce signal loop loss, return to step E6;

[0028] Step E9: Start the downhole submersible pump and observe the waveform of the received signal wave within a predetermined time.

[0029] Step E10: Adjust the first adjustable inductor and / or the second adjustable inductor;

[0030] Step E11: Determine whether the waveforms of the received signal wave and the transmitted signal wave are missing or interrupted. If yes, return to step E10; otherwise, continue.

[0031] Step E12: Save the adjustment values ​​of resistor, capacitor and inductor. Adjustment complete.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] 1. To address the high-pressure environment downhole, the outer casing withstands the high pressure, while the internal components of the power line carrier connection device, such as the wiring harness, conductors, carrier module, resistors, capacitors, and inductors, do not bear the high pressure. To address the high-temperature environment downhole, based on the actual connection status of the power line carrier transmission device, the device is placed in a high-temperature test environment downhole for electrical parameter debugging. The resistance, capacitance, and inductance parameters of the carrier module are set to ensure stable signal transmission.

[0034] 2. Because the composite continuous tubing and the power line carrier connection device of the downhole in-situ micro hydraulic station of the present invention includes a surface side, a downhole side, and a crossing device, the surface side includes a ground carrier module, the transmitting end of the ground carrier module is connected in series with a first adjustable capacitor, and the receiving end is connected in series with a first adjustable resistor; the downhole side includes a downhole downwave module, the transmitting end of the downhole downwave module is connected in series with a second adjustable capacitor, and the receiving end is connected in series with a second adjustable resistor; the transmitting end and receiving end of the ground carrier module and the receiving end and transmitting end of the downhole downwave module respectively communicate half-duplex through the crossing device, therefore, the present invention can greatly reduce signal loss and carrier echo reflection in the signal interaction transmission between the surface and the downhole, thereby enabling the signal to match the transmission distance with excellent stability, and also enabling the signal to maintain good fidelity over a longer transmission distance.

[0035] 3. Because the flexible claw mechanism of the present invention has a bidirectional hinge portion and a unidirectional hinge portion, the bidirectional hinge portion is located at the root of the flexible claw mechanism, and the flexible claw mechanism is integrally formed with the claw base through the bidirectional hinge portion. The bidirectional hinge portion is formed by the flexible claw mechanism being symmetrically recessed on opposite sides of the radial direction of the insertion position, and the unidirectional hinge portion is formed by the inner side of the flexible claw mechanism being recessed in the radial direction of the insertion position. Therefore, the insertion position of the present invention, through the bidirectional hinge portion, makes the flexible claw mechanism as a whole have excellent bidirectional elasticity in the radial direction of the insertion position, thereby making the insertion position have excellent insertion performance for the power line harness. Furthermore, through the unidirectional hinge portion, the flexible claw mechanism has a predetermined centripetal force relative to the insertion position, thereby enabling a stable insertion of the power line harness.

[0036] 4. An invention was made of a power line carrier connection device for composite coiled tubing and in-situ micro hydraulic station in the well for power and signal transmission in the coiled tubing, which meets the requirements of stable power and signal transmission in the well, insulation between power line bundles and between power line bundles and cylinder, and good sealing performance of the well high-pressure combination.

[0037] 5. The present invention also constructs a flexible claw mechanism to achieve rapid and convenient insertion and removal of power lines, and constructs a sealing unit and insulation device to solve the sealing problem and insulation problem of power line transmission in the high pressure and high temperature environment downhole.

[0038] 6. Based on the actual conditions of the connection device, the downhole power line carrier transmission device was placed in a high-temperature environment test. The adjustment steps of carrier impedance, capacitive reactance and inductive reactance on the ground and downhole were constructed, realizing stable signal transmission and improving the reliability of remote control of the downhole fluid station from the ground. Attached Figure Description

[0039] Figure 1 This is a schematic diagram illustrating the principle and scheme of a power line carrier connection device between a composite continuous tubing and a downhole in-situ micro hydraulic station, according to an embodiment of the present invention.

[0040] Figure 2 This is a schematic diagram of the power harness connection device between the composite continuous tubing and the in-situ micro hydraulic station in the well, according to an embodiment of the present invention.

[0041] Figure 3 This is a schematic diagram of the cross-sectional power line harness of a flexible composite continuous tube according to an embodiment of the present invention.

[0042] Figure 4(a) is a schematic diagram of the structure of the conductor rod to the power harness connection device of the in-situ micro hydraulic station in the well according to an embodiment of the present invention;

[0043] Figure 4(b) is a three-dimensional schematic diagram corresponding to Figure 4(a) with the end flange and the second insulating cylinder removed;

[0044] Figure 5(a) is a schematic diagram of the insulation unit, flexible quick-connect assembly and sealing assembly in the deep well downhole power line transmission device according to an embodiment of the present invention;

[0045] Figure 5(b) is a partial schematic diagram of Figure 5(a). Figure 1 ;

[0046] Figure 5(c) is a partial schematic diagram of Figure 5(a). Figure 2 ;

[0047] Figure 6(a) is a schematic diagram of the flexible gripper mechanism of an embodiment of the present invention;

[0048] Figure 6(b) is a schematic diagram of the flexible gripper of an embodiment of the present invention;

[0049] Figure 7 This is a schematic diagram of the ground-to-underground power line carrier communication carrier module and its adjustable capacitance and impedance, according to an embodiment of the present invention.

[0050] Figure 8 The following is a block diagram showing the setting of resistance, capacitance, and inductance parameters of the power line carrier module for the downhole device in an environment at high temperature, and the signal transmission debugging steps of the downhole in-situ micro hydraulic station.

[0051] In the diagram: 100, Power line carrier connection device between the composite coiled tubing and the downhole in-situ micro hydraulic station; 101, Composite coiled tubing; 102, Downhole steel pipe section; 103, First adjustable capacitor; 104, First adjustable resistor; 105, Second adjustable capacitor; 106, Second adjustable resistor; 107, First adjustable inductor; 108, Second adjustable inductor; 109, Ground carrier module; 110, Downhole carrier module; 111, Downhole submersible pump; 112, Downhole in-situ micro hydraulic station; 2 00. Downhole power harness connection device; 201. Composite coiled tubing power harness shunt end; 202a. Power harness connection unit from shunt end to conductor rod; 202b. Power harness lead-out unit from conductor rod to downhole micro hydraulic station; 203. Micro hydraulic station power harness lead-out end; 204. Flexible composite coiled tubing downhole side shunt end power harness; 300. Flexible composite coiled tubing; 301. Pump hole; 302. Flexible composite coiled tubing downhole side power harness; 303. Downhole submersible pump. Power line harness; 401, Termination flange; 402, Second insulating cylinder; 403, Spin-sealed cylinder; 404, Sealing flange; 405, Sleeve fitting; 406, Press-fit fitting; 407, Hydraulic rigid pipe; 501, First insulating sealing unit; 501a, First insulating cylinder; 502, Second insulating unit; 503, Flexible mating unit; 504, Insulating inner sleeve; 505, First axial sealing ring; 506, First circumferential sealing ring; 507, Sealing flange connecting bolts. 508. Stop flange; 509. Insulating retaining ring; 510. Phenolic resin ring; 511. Insulating filler; 512. Pressing positioning ring; 513. Threaded surface; 514. Second axial sealing ring; 515. Abutting surface; 516. Second circumferential sealing ring; 517. Flexible claw mechanism; 518. Conductor rod; 519. Downhole side power line harness; 520. Insulating sleeve; 521. Claw base; 601. Flexible claw; 602. One-way flexible hinge part; 603. Two-way flexible hinge part. Detailed Implementation

[0052] To make the technical means, creative features, objectives and effects of the present invention easier to understand, the following embodiments, in conjunction with the accompanying drawings, specifically illustrate the power line carrier connection device of the composite continuous pipe and the downhole in-situ micro hydraulic station of the present invention, as well as the debugging method of its mechanical parts and the carrier waveform debugging method. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0053] like Figures 1 to 3As shown, in this embodiment, the composite continuous tubing and the power line carrier connection device 100 of the downhole in-situ micro hydraulic station are connected via the composite continuous tubing 101. The connection includes: on the surface side, a ground carrier module 109, with a first adjustable capacitor 103 connected in series at the transmitting end and a first adjustable resistor 104 and a first adjustable inductor 107 connected in series at the receiving end; on the downhole side, a downhole downhole wave module 110, with a second adjustable capacitor 105 connected in series at the transmitting end and a second adjustable resistor 106 and a second adjustable inductor 108 connected in series at the receiving end; and a downhole power line harness connection device 200, where the transmitting and receiving ends of the ground carrier module 109 and the receiving and transmitting ends of the downhole downhole wave module 110 communicate in half-duplex mode. This includes a surface-side, a downhole-side, and a downhole power line harness connection device 200. Specifically, the surface-side is located in a normal temperature and pressure environment at the surface, while the downhole-side is in a high temperature and high pressure environment. The downhole-side power connection device 200 is placed on the downhole side. For every 1000 meters of well depth, the ambient temperature increases by approximately 30 degrees Celsius, and the pressure increases by 10 MPa. The composite coiled tubing and the downhole in-situ micro hydraulic station 112 power line carrier connection device 100 are used in conjunction with the downhole submersible pump 111. The power line harness of the downhole submersible pump runs through the composite coiled tubing 101 and the downhole steel pipe section 102, which are sequentially coupled within the wellbore. The power lines of the hydraulic station on the surface and the downhole submersible pump coexist in the composite continuous tubing 101 and are split in the downhole steel pipe section 102. The power lines of the downhole submersible pump run through the steel pipe section 102, while the power lines of the flexible composite continuous tubing downhole side split end 204 are split and electrically connected to the power line lead-out end 203 of the micro hydraulic station through the downhole power line connection device 200. That is, the downhole power line connection device 200 is located in a high temperature and high pressure environment downhole, and the current intensity transmitted by the downhole submersible pump is 10 to 15 times that of the current intensity transmitted on the surface and downhole sides.

[0054] The ground side of the downhole hydraulic station includes a ground power supply, a ground coupling filter, a first adjustable inductor 107, a ground carrier module 109, a first adjustable capacitor 103, and a first adjustable resistor 104. The first adjustable capacitor 103 is connected in series with the transmitting end of the ground carrier module 109, and the first adjustable resistor 104 is connected in series with the receiving end of the ground carrier module 109.

[0055] The downhole side includes a downhole power supply, a downhole coupling filter, a second adjustable inductor 108, a downhole downhole wave module 110, a second adjustable capacitor 105, and a second adjustable resistor 106. The second adjustable capacitor 105 is connected in series with the transmitting end of the downhole downhole wave module, and the second adjustable resistor 106 is connected in series with the receiving end of the downhole downhole wave module 109.

[0056] The downhole power harness connection device 200, the transmitting end and receiving end of the ground carrier module 109 and the receiving end and transmitting end of the downhole downhole wave module 110 are respectively coupled through the downhole power harness connection device, and the first adjustable inductor 104, the ground coupling filter, the ground power supply, the ground carrier module 109, the second adjustable inductor 108, the downhole coupling filter, the downhole power supply and the downhole downhole wave module 110 are connected in series to form a loop.

[0057] like Figures 4(a) to 5(c) As shown, the downhole power harness connection device 200 includes a conductor rod 518 and two power harness connection units, namely, a power harness connection unit 202a from the shunt end to the conductor rod and a power harness lead-out unit 202b from the conductor rod to the downhole micro hydraulic station. The two power harness connection units are detachably connected to each other at their ends and are symmetrically arranged. They are used for electrical connection of the downhole power harness 302 and the downhole power harness 519 of the flexible composite continuous tubing, respectively. The conductor rod 518 is used to electrically connect the two power harness connection units. Specifically, the two power harness connection units are the power harness connection unit 202a from the shunt end to the conductor rod and the power harness lead-out unit 202b from the conductor rod to the downhole micro hydraulic station.

[0058] Specifically, the power harness connection unit is electrically connected to the power harness 204 at the downhole branch end of the flexible composite continuous pipe and the power harness 519 at the downhole side through the crimping joint 406, and the two ends of the crimping joint 406 are fastened to the corresponding components through the sealing flange 404 and the casing joint 405.

[0059] The power harness connection unit includes a first insulating and sealing unit, a flexible mating unit, and a sealing unit.

[0060] The first insulating sealing unit is used to insulate the power harness of the split-end / downhole in-situ micro hydraulic station. It includes a first insulating cylinder 501a, an insulating inner sleeve 504, a second insulating cylinder 402, and an insulating assembly. The first insulating cylinder 501a, the insulating inner sleeve 504, and the second insulating cylinder 402 are all open at both ends. The conductor rod passes through the first insulating cylinder 501a and the second insulating cylinder 402 in sequence. The two power harness connection units are connected through the flange of their respective first insulating cylinder 501a. The insulating inner sleeve 504 is fitted inside the first insulating cylinder 501a. The conductor rod 518 passes through the insulating inner sleeve 504 and is installed inside the first insulating cylinder 501a.

[0061] One end of the second insulating cylinder 402 is connected to the first insulating cylinder 501a as a connection end. Specifically, the ends of the second insulating cylinder 402 and the first insulating cylinder 501a have corresponding end flanges 401, and the two are connected by sealing flange connecting bolts 507.

[0062] The second insulating cylinder 402 is hollow and has an inwardly protruding stop flange 508 located near the opening at the connecting end.

[0063] The insulation assembly includes an insulating retaining ring 509, multiple phenolic resin rings 510, multiple insulating fillers 511, and a clamping positioning ring 512. The multiple phenolic resin rings 510 are parallel to each other and located within the second insulating cylinder 402, with the outer edge of each phenolic resin ring 510 larger than the retaining flange 508, thus securing the phenolic resin rings 510 within the second insulating cylinder 402. Each phenolic resin ring 510 has multiple wire-passing holes (not shown in the figures), through which conductor rods 518 pass. Insulating fillers 511 are filled between any two adjacent phenolic resin rings 510. The clamping positioning ring 512 is located at the end of the second insulating cylinder 402. Specifically, the internal cavity of the second insulating cylinder 402 is cylindrical, and the retaining flange 508 facilitates the connection... The opening at one end is smaller than the cross-section of the cavity, so that the insulating retaining ring 509 can be blocked by the stopping flange 508. The phenolic resin ring 510 clamps the insulating filler 511, and the two ends of the inner cavity of the second insulating cylinder 402 are the insulating retaining ring 509 and the clamping positioning ring 512, respectively. The surface side and the underground side are transmitted by carrier current through three power lines. Correspondingly, the number of wire holes on the phenolic resin ring 510 is also three. In this embodiment, the phenolic resin ring 510 and the insulating filler 511 should be tightly attached to each other and fill the inner cavity of the second insulating cylinder 402. In order to better fit tightly to each other and fill the inner cavity of the second insulating cylinder 402, an insulating retaining ring 509 with a predetermined thickness and insulation is provided between the phenolic resin ring 510 and the stopping flange 508.

[0064] The first insulating sealing unit 501 and the second insulating cylinder 402 bear the high pressure on the downhole side, while the power harness and conductor rod 518 of the shunt end / downhole in-situ micro hydraulic station bear the normal pressure.

[0065] The flexible interlocking unit includes a spun-sealed cylinder 403 and a flexible claw mechanism 517 disposed within the spun-sealed cylinder 403.

[0066] As shown in Figures 6(a) and 6(b), the flexible claw mechanism 517 has a claw base 521 and a plurality of flexible claws 601 formed on one side of the claw base 521. The power harness of the shunt end / downhole in-situ micro hydraulic station is welded to the other side of the claw base 521. The plurality of flexible claws 601 are arranged in a circumferential array and are centrally symmetrical, thereby forming a plug-in position (not shown in the figure). The flexible claws 601 are elastic along the radial direction of the plug-in position. The plug-in position is used to plug in the conductor rod 518.

[0067] The flexible claw 515 has a unidirectional flexible hinge portion 602 and a bidirectional flexible hinge portion 603.

[0068] Both the unidirectional flexible hinge portion 602 and the bidirectional flexible hinge portion 603 are formed by the flexible claw 601 being recessed radially along the insertion position. The bidirectional flexible hinge portion 603 is located at the root of the flexible claw 601, so that the flexible claw 601 is integrated with the claw base 521 through the bidirectional flexible hinge portion 603. The indentation of the bidirectional flexible hinge portion 521 is formed on opposite sides of the flexible claw 601 and is symmetrical. The indentation of the unidirectional flexible hinge portion 602 is formed on one side of the flexible claw 601 located within the insertion position.

[0069] Specifically, the bidirectional flexible hinge portion 603 is concave to form an arc surface, and the thickness ratio of the bidirectional flexible hinge portion 603 to the adjacent flexible claw portion 601 is not greater than 10%. The unidirectional flexible hinge portion is concave to form an arc surface, and the thickness ratio of the unidirectional flexible hinge portion to the adjacent flexible claw portion is not greater than 10%.

[0070] The other end of the second insulating cylinder 402 is detachably connected to the spun sealing cylinder 403 via threads. Specifically, the second insulating cylinder 402 and the spun sealing cylinder 403 form a mating threaded surface 513 and a mating abutment surface 515 through threaded engagement, and the threaded surface 513 and the abutment surface 515 are perpendicular to each other. Both the second insulating cylinder 402 and the spun sealing cylinder 403 have mating threaded surfaces 513 and abutment surfaces 515, and the abutment surface 515 is located on the second insulating cylinder 402. A stepped surface is formed on the inner circumferential surface of 02, and a stepped surface is formed on the outer circumferential surface of the spun sealing cylinder 403 on the abutting surface 515. The clamping positioning ring 512 is located between the second insulating cylinder 402 and the spun sealing cylinder 403, and the spun sealing cylinder 403 tightens the clamping positioning ring 512 against the end face of the second insulating cylinder 402 by screwing it into the second insulating cylinder 402, so that the insulating retaining ring 509, the second phenolic resin ring 510, the insulating filler 511 and the clamping positioning ring 512 are all sealed and fitted together.

[0071] The sealing assembly includes a first axial sealing ring 505, a first circumferential sealing ring 506, a second axial sealing ring 514, and a second circumferential sealing ring 516.

[0072] The first axial sealing ring 505 is disposed circumferentially between the first insulating sealing unit 501 and the insulating inner sleeve 504; the first circumferential sealing ring 506 is disposed circumferentially between the first insulating cylinder 501 and the second insulating cylinder 402.

[0073] The second axial sealing ring 514 is disposed circumferentially between the lower cylindrical surfaces of the threaded surface 513 along the second insulating cylinder 402; the second circumferential sealing ring 516 is disposed circumferentially between the abutment surfaces 515 along the second insulating cylinder 402.

[0074] The method for debugging the mechanical part of the downhole side power harness connection device of the downhole in-situ micro hydraulic station includes the following steps:

[0075] Step C1: Insert the power harness of the split end / downhole in-situ micro hydraulic station into the corresponding spinning sealing cylinder 403 and weld it to the claw base 521.

[0076] Step C2: The second insulating cylinder 402 and the first insulating sealing unit 501 are sequentially placed on the spun sealing cylinder 403, so that the wire passage hole corresponds to the plug-in position, and the wire passage hole is connected to the insulating inner sleeve 504.

[0077] Step C3: Insert the conductor rod 518 into the plug-in position through the insulating inner sleeve 504 and the wire hole in sequence, and connect it to the two first insulating sealing units 501.

[0078] like Figure 7 and Figure 8 As shown, the waveform debugging method for the power signal transmission of the downhole in-situ micro hydraulic station, based on the above-mentioned mechanical part debugging method for the downhole side power harness connection device, is conducted in a high-temperature and high-pressure downhole environment, and includes the following steps:

[0079] Step E1: Start the ground carrier module and the well-ground waveform module, and use two spectrum analyzers (not shown in the attached figure) to obtain the transmitting waveform and corresponding signal energy of the ground carrier module and the receiving waveform and corresponding signal energy, respectively.

[0080] Step E2: Adjust the first adjustable resistor 104 and / or the second adjustable resistor 105 to absorb the echo of the transmitted signal, and return to step E3;

[0081] Step E3: Detect the received signal wave and the reflected signal echo from the transmitted signal wave in the received waveform;

[0082] Step E4: Determine whether the signal energy of the reflected signal echo is less than 10% of the signal energy of the received signal wave. If yes, continue to step E5; otherwise, return to step E2.

[0083] Step E5: After adjusting the first adjustable capacitor 103 and / or the second adjustable capacitor 106 to reduce signal loop loss, return to step E6.

[0084] Step E6: Detect the transmitted signal wave from the transmitted waveform;

[0085] Step E7: Determine that the waveform similarity between the received signal wave and the transmitted signal wave is 75%-85%. If yes, proceed to step E8; otherwise, proceed to step E5.

[0086] Step E8: After adjusting the first adjustable capacitor 103 and / or the second adjustable capacitor 106 to match the signal transmission distance, return to step E6;

[0087] Step E9: Start the downhole submersible pump and observe the waveform of the received signal wave within a predetermined time.

[0088] Step E10: Adjust the first adjustable inductor 107 and / or the second adjustable inductor 108;

[0089] Step E11: Determine whether the waveforms of the received signal wave and the transmitted signal wave are missing or interrupted. If yes, return to step E10; otherwise, continue.

[0090] Step E12: Save the adjustment values ​​of resistor, capacitor and inductor. Adjustment complete.

[0091] Specifically, when the downhole submersible pump is started, the current intensity transmitted by the downhole submersible pump is 10 to 15 times that of the power supply current of the in-situ micro hydraulic station. In the composite coiled tubing, the current transmitted by the downhole submersible pump causes significant signal interference to the carrier signal communication on the surface side and the downhole side, resulting in unstable signal fluctuations and waveform loss or interruption. This can be improved by adjusting the first adjustable inductor 107 and / or the second adjustable inductor 108.

[0092] The above embodiments are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Various modifications or variations that can be made by those skilled in the art without creative effort within the scope of the appended claims are still within the scope of protection of this patent.

Claims

1. A power line carrier connection device between a composite continuous tubing and a downhole in-situ micro hydraulic station, wherein the wiring is routed through the composite continuous tubing, characterized in that... include: On the ground side, there is a ground carrier module, the transmitting end of which is connected in series with a first adjustable capacitor and the receiving end is connected in series with a first adjustable resistor. The downhole side includes a downhole downhole wave module, the transmitting end of which is connected in series with a second adjustable capacitor, and the receiving end of which is connected in series with a second adjustable resistor; The downhole power line harness connection device allows the transmitter and receiver of the ground carrier module to communicate with the receiver and transmitter of the downhole ground carrier module via the downhole power line harness connection device in half-duplex mode. The downhole power harness connection device is located between the downhole power harness shunt end and the downhole micro hydraulic station power harness lead-out end. It includes a conductor rod and two power harness connection units: one connecting the shunt end to the conductor rod, and the other connecting the conductor rod to the downhole micro hydraulic station power harness lead-out end. The two power harness connection units are detachably connected at their ends and symmetrically arranged, respectively for electrical connection to the power harness at the shunt end and the power harness of the downhole micro hydraulic station. The conductor rod is used to electrically connect the two power harness connection units. The power harness connection unit includes a flexible plug-in unit. The flexible interlocking unit includes a spun-sealed cylinder and a flexible claw mechanism disposed within the spun-sealed cylinder. The flexible claw mechanism has a claw base and multiple flexible claws formed on one side of the claw base. The power harness of the shunt end / downhole in-situ micro hydraulic station is welded to the other side of the corresponding claw base. The multiple flexible claws are arranged in a circumferential array and are centrally symmetrical, thereby forming a plug-in position. The flexible claws are elastic along the radial direction of the plug-in position, which is used to plug in the conductor rod.

2. The power line carrier connection device for the composite continuous tubing and the downhole in-situ micro hydraulic station according to claim 1, characterized in that: in, The flexible claw has a bidirectional flexible hinge portion and a unidirectional flexible hinge portion. Both the bidirectional flexible hinge portion and the unidirectional flexible hinge portion are formed by the flexible claw being recessed radially along the insertion position. The bidirectional flexible hinge portion is located at the root of the flexible claw, thereby the flexible claw is integrally formed with the claw base through the bidirectional flexible hinge portion. The concave portion of the bidirectional flexible hinge is formed on opposite sides of the flexible claw and is symmetrical, while the concave portion of the unidirectional flexible hinge is formed on one side of the flexible claw located within the insertion position.

3. The power line carrier connection device for the composite continuous tubing and the downhole in-situ micro hydraulic station according to claim 2, characterized in that: in, The bidirectional flexible hinge portion is concave to form an arc surface, and the thickness ratio of the bidirectional flexible hinge portion to the adjacent flexible claw portion is no greater than 10%. The unidirectional flexible hinge portion is concave to form an arc surface, and the thickness ratio of the unidirectional flexible hinge portion to the adjacent flexible claw portion is not greater than 10%.

4. The power line carrier connection device for the composite continuous tubing and the downhole in-situ micro hydraulic station according to claim 3, characterized in that: in, The power harness connection unit also includes an insulation unit. The insulating unit is used to insulate the power harness of the shunt end / downhole in-situ micro hydraulic station. It includes a first insulating cylinder, an inner insulating sleeve, a second insulating cylinder, and an insulating assembly. The first insulating cylinder, the inner insulating sleeve, and the second insulating cylinder are all open at both ends. The conductor rod passes through the first insulating cylinder and the second insulating cylinder in sequence. The two power line harness connection units are connected via their respective first insulating cylinders. The inner insulating sleeve is fitted inside the first insulating cylinder, and the conductor rod passes through the inner insulating sleeve within the first insulating cylinder. One end of the second insulating cylinder is connected to the first insulating cylinder as a connection end; the other end is detachably connected to the spun-sealed cylinder via a thread. The second insulating cylinder has an inwardly projecting stop flange located near the opening at the connecting end. The insulating assembly includes multiple phenolic resin rings, insulating filler, and insulating retaining rings. The plurality of phenolic resin rings are parallel to each other and located within the second insulating cylinder, with the outer edge of each phenolic resin ring being larger than the stop flange, thereby stopping the phenolic resin ring within the second insulating cylinder. Each phenolic resin ring has a plurality of wire-passing holes through which the conductor rod passes. The insulating filler is placed between any two adjacent phenolic resin rings. The insulating retaining ring is located between the second insulating cylinder and the spun-sealed cylinder, and the phenolic resin ring, the insulating filler, and the insulating retaining ring are all sealed and fitted together. The first and second insulating cylinders are subjected to high pressure on the downhole side, while the power harness of the shunt end / downhole in-situ micro hydraulic station and the conductor rod are subjected to normal pressure.

5. The power line carrier connection device for the composite continuous tubing and the downhole in-situ micro hydraulic station according to claim 4, characterized in that: in, The power harness connection unit further includes a sealing assembly, comprising a first axial sealing ring, a first circumferential sealing ring, a second axial sealing ring, and a second circumferential sealing ring. The first axial sealing ring is circumferentially disposed between the first insulating cylinder and the insulating inner sleeve; the first circumferential sealing ring is circumferentially disposed between the first insulating cylinder and the second insulating cylinder. The second insulating cylinder and the spun sealing cylinder are connected by threads to form mating threaded surfaces and mating abutment surfaces, and the threaded surfaces and abutment surfaces are perpendicular to each other. The second axial sealing ring is disposed circumferentially between the lower cylindrical surfaces of the threaded surface of the second insulating cylinder; the second circumferential sealing ring is disposed circumferentially between the abutting surfaces of the second insulating cylinder.

6. The power line carrier connection device for the composite coiled tubing and the downhole in-situ micro hydraulic station according to claim 5, used in conjunction with a downhole submersible pump and sharing the composite coiled tubing routing with the submersible pump, is characterized in that: in, The ground side also includes a ground power supply, a ground coupling filter, and a first adjustable inductor. The downhole side also includes a downhole power supply, a downhole coupling filter, and a second adjustable inductor. The first adjustable inductor, the ground coupling filter, the ground power supply, the ground carrier module, the second adjustable inductor, the downhole coupling filter, the downhole power supply, and the downhole carrier module are connected in series to form a loop.

7. A debugging method for a power line carrier connection device applicable to the composite continuous tubing and in-situ micro hydraulic station as described in claim 6, characterized in that, Includes the following steps: Step C1: Insert the power harness of the splitter / downhole in-situ micro hydraulic station into the corresponding spinning sealing cylinder and weld it onto the claw base; Step C2: The second insulating cylinder and the first insulating cylinder are sequentially arranged on the spun sealing cylinder, such that the wire passage hole corresponds to the insertion position, and the wire passage hole is connected to the insulating inner sleeve. Step C3: Insert the conductor rod into the insertion position through the insulating inner sleeve and the wire hole in sequence, and connect it with the two first insulating cylinders.

8. The debugging method according to claim 7, wherein the debugging environment is a high-temperature and high-pressure environment, characterized in that, Includes the following steps: Step E1: Start the ground carrier module and the well-ground waveform module, and use two spectrum analyzers to obtain the transmitting waveform and corresponding signal energy of the ground carrier module and the receiving waveform and corresponding signal energy, respectively. Step E2: Adjust the first adjustable resistor and / or the second adjustable resistor to absorb the echo of the transmitted signal, and return to step E3; Step E3: Detect the received signal wave and the reflected signal echo from the transmitted signal wave in the received waveform; Step E4: Determine whether the signal energy of the reflected signal echo is less than 10% of the signal energy of the received signal wave. If yes, continue to step E5; otherwise, return to step E2. Step E5: After adjusting the first adjustable capacitor and / or the second adjustable capacitor to reduce signal loop loss, return to step E6; Step E6: Detect the transmitted signal wave from the transmitted waveform; Step E7: Determine if the waveform similarity between the received signal wave and the transmitted signal wave is 75%-85%. If yes, proceed to step E8; otherwise, proceed to step E5. Step E8: After adjusting the first adjustable capacitor and / or the second adjustable capacitor to reduce signal loop loss, return to step E6; Step E9: Start the downhole submersible pump and observe the waveform of the received signal wave within a predetermined time. Step E10: Adjust the first adjustable inductor and / or the second adjustable inductor; Step E11: Determine whether the waveforms of the received signal wave and the transmitted signal wave are missing or interrupted. If yes, return to step E10; otherwise, continue. Step E12: Save the adjustment values ​​of resistor, capacitor and inductor. Adjustment complete.

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