A reusable threaded short-circuit device

Abstract

The present invention discloses a reusable threaded short-circuit device, comprising a connector whose two end joints are connected by threads on the outside and whose internal conductor is movably connected to the two end joints, the connector comprising a pressure plate and a rotating sleeve, the pressure plate and the rotating sleeve are encapsulated at the two ends of the connector and are respectively movably nested and connected with the rotating sleeves and pressure plates of the other two joints with the axis of the connector as the rotating axis, and the scheme of the present invention is adopted to realize coaxial transmission multi-core cables, and the pipelines used in oil mining can be flexibly rotated and connected by threaded joints without causing the cables in the connector to be tangled and damaged, the structure is simple, and the processing difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of downhole instrument and tool connection, and in particular to a reusable threaded connection type short-circuit device. Background Art

[0002] In the process of oil and gas extraction, a large number of downhole instruments and tools are needed. Usually, multiple instruments and tools are needed for one trip down the well. The connectors between the tools play a vital role. The connector completes the power supply and signal transmission between the instruments. The power provided by the ground instrument and the control signal sent down are sent to each downhole tool or instrument step by step, and the downhole signal is transmitted back to the ground instrument in real time and correctly. The deep formations of oil and gas wells are surrounded by a harsh environment of high temperature and high pressure with oil-mud mixture. The traditional connector is wrapped and sealed with a rubber sleeve on the outside. However, under high temperature and high pressure conditions, the insulation performance of the rubber sleeve decreases, and the extent of the decrease in insulation performance threatens the normal transmission of the electrical signal of the conductive layer, resulting in signal distortion, which leads to erroneous conclusions. Moreover, either single-core or multi-core are relatively independently distributed on the sealing block and cannot be rotated arbitrarily.

[0003] During the oil well logging and perforating process, multiple clusters of gun barrels need to be lowered into the well at one time. The gun barrels are connected by joints. The hollow space of the joints is used to place the wires. With the traditional joint structure, the wires are easily tangled, causing short circuits / short circuits.

[0004] The invention patent with announcement number CN 204905553 U discloses a high temperature and high pressure resistant sealed connector, including a jack and a pin, the outer wall of the jack is wrapped with a rubber sleeve, and an insulating protective layer is provided between the rubber sleeve and the jack; the insulating protective layer exceeds the jack body at the insertion end of the jack, and a step is formed on the inner wall of the exceeding part, and the step is flush with the jack port; the inner diameter of the insulating protective layer exceeding the jack is equal to the outer diameter of the pin shell. The connector is provided with a rubber sleeve outside the jack, and an insulating protective layer is provided between the rubber sleeve and the jack, and can still maintain good insulation performance under high temperature and high pressure. This invention is also not a coaxial multi-core high temperature and high pressure resistant sealed connector and cannot be rotated arbitrarily around the axis of the connector. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a reusable threaded short-circuit device. This patent is designed for use in multi-core sliding sleeves, avoiding the wire connection between rotating parts, and using gold-plated copper crown springs of different outer diameters as a multi-core connector. It is convenient for on-site installation and use, and reduces the dependence of construction links on skilled operation. Under the premise of ensuring the free rotation of the coaxial line, it can effectively ensure the efficient supply and transmission of underground power and signals.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] The reusable threaded short-circuit device comprises a connector whose two end joints are connected by threads on the outside and whose internal conductor is movably connected with the two end joints, and the connector comprises a pressure plate and a rotating sleeve, which are encapsulated at both ends of the connector and are movably nested and connected with the rotating sleeves and pressure plates of the other two joints respectively with the axis of the connector as the rotating axis;

[0008] The rotating sleeve includes a cylindrical joint, a central copper sleeve is nested inside the other end of the cylindrical joint, and the central copper sleeve is also provided with an electric needle wiring channel that passes through one end of the cylindrical joint; the pressure plate includes a central conductive needle and an insulating needle, the insulating needle sleeve is outside the central conductive needle, there is a limit step between the two, an interference fit is used, and a sealing O-ring is used to achieve sealing; an insulating ring is nested outside the central conductive needle; the central conductive needle and the insulating ring are both interference fit and a limit step is set; a sealing ring is also provided between the central conductive needle and the insulating ring; the central conductive needle is movably nested in the rotating sleeve;

[0009] An outer copper sleeve is fixedly nested inside one end of the cylindrical joint, and the outer copper sleeve is also connected to a crown spring wiring channel that runs through the other end of the cylindrical joint; the center conductive needle, insulating needle, hollow conductive tube and insulating ring are all interference fit and limited steps are provided; a sealing ring is also provided between the center conductive needle, insulating needle, hollow conductive tube and insulating ring; the outer copper sleeve, crown spring wiring channel and insulating needle and hollow conductive tube are arranged in pairs; the joint is a PEEk joint, and the outer copper sleeve is a gold-plated copper crown spring.

[0010] In the above-mentioned short-circuit device, the connector includes a single-core connector and a dual-core connector, and the dual-core connector also includes an insulating pin and a hollow conductive tube; the insulating pin, the hollow conductive tube and the insulating ring are nested in sequence outside the central conductive pin; the central conductive pin can be movably nested in the rotating sleeve, and the hollow conductive tube can be movably nested in the rotating sleeve through the outer copper sleeve.

[0011] In the above short-circuit device, the sealing ring is a sealing O-ring made of fluororubber.

[0012] In the above short-circuit device, the insulating needle and the insulating ring are made of polyetheretherketone (PEEK) material.

[0013] In the above short-circuit device, one end of the insulating ring is also provided with a threaded hole for fixing.

[0014] In the above short-circuit device, a metal ring for bearing pressure is nested outside the insulating ring, and a limited step is provided between the metal ring and the insulating ring.

[0015] In the above short-circuit device, the metal ring is made of CrMo metal material.

[0016] The beneficial effects of the present invention are:

[0017] 1. It can realize coaxial transmission of multi-core cables. The oil mining pipeline can be flexibly connected by threaded joints without damaging the cables in the connector. No other joints are required. The upper and lower barrels can be directly connected, which is convenient for installation, less on-site wiring, simple structure, and reduces the difficulty of processing.

[0018] 2. Reduce misoperation during on-site use and avoid human errors introduced by on-site wiring.

[0019] 3. Applied to the releasable short section structure, it can also realize arbitrary thread rotation connection and realize the reuse of the short section. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the assembly structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the pressure wire passer of the present invention;

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the pressure-bearing wire passer of the present invention;

[0023] Figure 4 This is a schematic cross-sectional structure diagram of a pressure wire passer according to another embodiment of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the rotary sleeve of the present invention;

[0025] Figure 6 It is a schematic diagram of the cross-sectional structure of the rotary sleeve of the present invention;

[0026] Figure 7 This is a schematic diagram of the present invention applied to a releasable short section structure;

[0027] Figure 8 It is a schematic diagram of the cross-sectional structure of the present invention applied to a releasable short section.

[0028] In the figure:

[0029] 1—perforating gun barrel; 2—double-core plug at the lower end of the gun; 3—connecting joint; 4—single-core connector in the joint; 5—single-core pressure-bearing wire passer; 6—retaining ring; 7—single-core plug at the upper end of the gun; 8—rotating sleeve; 801—joint; 802—outer copper sleeve; 803—center copper sleeve; 804—electric needle wiring channel; 805—crown spring wiring channel; 9—sealing ring; 10—pressure plate; 101—center conductive needle, 102—insulating needle, 103—hollow conductive cylinder, 104—insulating ring, 105—metal ring, 106—sealing ring, 107—threaded hole. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] refer to Figures 1 to 8 This patent discloses a reusable threaded short-circuit device, including a connector with two end joints connected by threads on the outside and an internal conductor movably connected to the two end joints, the connector includes a pressure plate 10 and a rotating sleeve 8, the pressure plate 10 and the rotating sleeve 8 are encapsulated at both ends of the connector and are movably nested with the rotating sleeves 8 and pressure plates 10 of the other two joints with the axis of the connector as the rotation axis.

[0032] Connectors include single-core connectors and dual-core connectors

[0033] refer to Figure 1 The single-core connector includes a pressure plate 10 and a rotating sleeve 8; the rotating sleeve 8 includes a cylindrical joint 801, and a central copper sleeve 803 is nested inside the other end of the cylindrical joint 801, and the central copper sleeve 803 is also provided with an electric needle wiring channel 804 that passes through one end of the cylindrical joint 801; the pressure plate 10 includes a central conductive needle 101 and an insulating needle 102, and the insulating needle 102 is sleeved outside the central conductive needle 101, and there is a limiting step between the two, and an interference fit and a sealing O-ring are used to achieve sealing; an insulating ring 104 is nested outside the central conductive needle 101; the central conductive needle 101 and the insulating ring 104 are both interference fit and a limiting step is set; a sealing ring 106 is also set between the central conductive needle 101 and the insulating ring 104; the central conductive needle 101 is movably nested in the rotating sleeve 8.

[0034] refer to Figure 2 and Figure 3 ,remove Figure 1In addition to the technical features, the dual-core connector also includes an insulating pin 102, a hollow conductive cylinder 103 and an insulating ring 104; the insulating pin 102 is sleeved outside the central conductive pin 101, and there is a limiting step between the two, and an interference fit and a sealing O-ring are used to achieve sealing; the hollow conductive cylinder 103 is sleeved outside the insulating pin 102, and there is a limiting step between the two, and an interference fit and a sealing O-ring are used to achieve sealing; the insulating ring 104 is sleeved outside the hollow conductive cylinder 103, and there is a limiting step between the two, and an interference fit and a sealing O-ring are used to achieve sealing, and the hollow conductive cylinder 103 is movably nested in the rotating sleeve 8 through the outer copper sleeve 802. The central conductive pin 101 and the hollow conductive cylinder 103 are both processed with beryllium copper and gold-plated to ensure conductivity and corrosion resistance in harsh environments; the insulating pin 102 and the insulating ring 104 are both processed with high temperature and high pressure resistant polyetheretherketone PEEK material; the sealing rings are made of high temperature resistant and corrosion resistant materials.

[0035] In order to further enhance the high-voltage resistance, a metal ring 105 may be provided. The metal ring 105 is sleeved on the outside of the insulating ring 104 with a limiting step between them. An interference fit and a sealing O-ring are used to achieve sealing.

[0036] In the present invention described above, an outer copper sleeve 802 is fixedly nested inside one end of the tubular connector 801 of the dual-core connector, and the outer copper sleeve 802 is also connected to a crown spring wiring channel 805 that passes through the other end of the tubular connector 801; an insulating needle 102, a hollow conductive tube 103 and an insulating ring 104 are sequentially nested outside the center conductive needle 101; the center conductive needle 101, the insulating needle 102, the hollow conductive tube 103 and the insulating ring 104 are all interference fit and a limited step is provided; a sealing ring 106 is also provided between the center conductive needle 101, the insulating needle 102, the hollow conductive tube 103 and the insulating ring 104; the outer copper sleeve 802, the crown spring wiring channel 805 and the insulating needle 102, the hollow conductive tube 103 are arranged in pairs.

[0037] In the scheme of the present invention, a sealing ring 106 is further arranged between the central conductive needle 101, the insulating needle 102, the hollow conductive tube 103 and the insulating ring 104; the outer copper sleeve 802, the crown spring wiring channel 805 and the insulating needle 102, the hollow conductive tube 103 are arranged in pairs, and the purpose of multiple cores can be achieved by nesting multiple pairs.

[0038] One end of the insulating ring 104 is also provided with a threaded hole 107 for fixing.

[0039] A metal ring 105 for bearing pressure is nested outside the insulating ring 104 , and a limiting step is provided between the metal ring 105 and the insulating ring 104 .

[0040] The pressure plate 10 is a double-core connector in the joint;

[0041] The connector 801 is a PEEk connector, and the outer copper sleeve 802 is a gold-plated copper crown spring.

[0042] The sealing ring 106 is a sealing O-ring made of fluororubber.

[0043] The insulating needle 102 and the insulating ring 104 are made of polyetheretherketone (PEEK) material.

[0044] The metal ring 105 is made of 40CrMo metal material.

[0045] The double-core pressure wire feeder is also called the double-core connector in the joint, the pressure plate or the sealing plug, which is used for signal transmission under high temperature and high pressure conditions in the oil well logging device.

[0046] The rotating sleeve is also called the outer copper sleeve or the female seat, which is also used for signal transmission under high temperature and high pressure conditions in oil well logging devices and is connected with the pressure plate.

[0047] Hollow conductive tubes, also called hollow needles, are used for the transmission of electrical signals.

[0048] The coaxial single-core high temperature and high pressure sealed connector of the present invention has a dual-core structure. The 3-core, 4-core and 5-core structures are achieved by putting one or more layers of hollow conductive cylinders with larger diameters on the outside of the hollow conductive cylinder 103, and so on to achieve multiple cores.

[0049] O-rings are made of fluororubber. Fluororubber refers to a synthetic polymer elastomer containing fluorine atoms on the carbon atoms of the main chain or side chain. The introduction of fluorine atoms gives the rubber excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance and atmospheric aging resistance.

[0050] Peek, or polyetheretherketone, is a special engineering plastic with excellent properties such as high temperature resistance, self-lubrication, easy processing and high mechanical strength. It can be manufactured and processed into various mechanical parts.

[0051] H62 brass means ordinary brass with an average copper content of 62%

[0052] Metal ring 40CrMo has high strength, hardenability, good toughness, small deformation during quenching, and high creep strength and endurance strength at high temperature.

[0053] Multiple coaxial single-core high-temperature and high-pressure resistant sealed connectors are directly connected using wires.

[0054] refer to Figure 7 and Figure 8, is an embodiment of the present invention, including a single-core connector A and a dual-core connector (B, C), the single-core connector A includes a single-core connector 4 and a single-core pressure-bearing wire passer 5 in the joint, and the dual-core connector includes a pressure plate 10 and a rotating sleeve 8; the single-core connector 4 and the single-core pressure-bearing wire passer in the connector are the lower end of a connector (dual-core connector B) with cascade effect, and the control signal and power supply of the single-core connector A need to be transmitted to the subsequent connector (dual-core connector C); the rotating sleeve 8 and the pressure plate 10 are the upper end of the dual-core connector (B, C), wherein the center pin 101 is a cascade pin, connected to the single-core pressure-bearing wire passer 5 of the previous stage short circuit (single-core connector A), and receives the signal transmitted from the previous stage, and the hollow conductive tube 103 is the signal output pin of the outer conductive tube, i.e., the dual-core connector (B, C), and outputs the downhole instrument control signal, such as the detonation signal of the magnetic detonator, the large resistance igniter, etc.

[0055] This patent is designed for multi-core sliding sleeves, avoiding the wire connection between rotating parts, and using different outer diameters of gold-plated copper crown springs as a multi-core connector. It is convenient for on-site installation and use, and reduces the dependence of construction on skilled operation. It reduces misoperation during on-site use and avoids human errors introduced by on-site wiring.

[0056] It can realize coaxial transmission of multi-core cables. The pipelines used in oil mining can be flexibly connected by threaded joints without causing the cables in the connector to be tangled and damaged. No other joints are required for conversion. The upper and lower barrels can be directly connected, which is convenient for installation, with less on-site wiring, simple structure, and reduced processing difficulty.

[0057] The present invention is applied to a releasable short section structure, and can also realize arbitrary rotational connection through threads to realize the reuse of the short section. The above content is a further detailed description of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to this. For ordinary technicians in the technical field to which the present invention belongs, making several equivalent substitutions or obvious modifications without departing from the concept of the present invention, and the performance or use is the same, should be regarded as belonging to the scope of patent protection of the present invention determined by the submitted claims.

Claims

1. A reusable threaded short-circuit device, characterized in that: A connector comprising two end connectors connected externally by means of threads and an internal conductor movably connected to the two end connectors, the connector comprising a pressure plate (10) and a rotating sleeve (8), the pressure plate (10) and the rotating sleeve (8) being encapsulated at two ends of the connector and respectively movably nested with the rotating sleeves (8) and the pressure plate (10) of the other two connectors with the axis of the connector as the rotating axis; The rotating sleeve (8) comprises a cylindrical joint (801), a central copper sleeve (803) is nested inside the other end of the cylindrical joint (801), and the central copper sleeve (803) is also provided with an electric needle wiring channel (804) that passes through one end of the cylindrical joint (801); the pressure plate (10) comprises a central conductive needle (101) and an insulating needle (102), the insulating needle (102) is sleeved outside the central conductive needle (101), and there is a limiting step between the two, and an interference fit and a sealing O-ring are used to achieve sealing; an insulating ring (104) is nested outside the central conductive needle (101); the central conductive needle (101) and the insulating ring (104) are both interference fit and provided with a limiting step; a sealing ring (106) is also provided between the central conductive needle (101) and the insulating ring (104); the central conductive needle (101) is movably nested in the rotating sleeve (8); An outer copper sleeve (802) is fixedly embedded inside one end of the cylindrical joint (801), and the outer copper sleeve (802) is also connected to a crown spring wiring channel (805) that passes through the other end of the cylindrical joint (801); the central conductive needle (101), the insulating needle (102), the hollow conductive tube (103) and the insulating ring (104) are all interference-fitted and provided with a limited step; a sealing ring (106) is also provided between the central conductive needle (101), the insulating needle (102), the hollow conductive tube (103) and the insulating ring (104); the outer copper sleeve (802), the crown spring wiring channel (805), the insulating needle (102) and the hollow conductive tube (103) are arranged in pairs; the joint (801) is a PEEk joint, and the outer copper sleeve (802) is a gold-plated copper crown spring.

2. The reusable threaded short-circuit device according to claim 1, characterized in that: The connector comprises a single-core connector and a dual-core connector, wherein the dual-core connector further comprises an insulating pin (102) and a hollow conductive tube (103); the insulating pin (102), the hollow conductive tube (103) and the insulating ring (104) are sequentially nested outside the central conductive pin (101); the central conductive pin (101) is movably nested in the rotating sleeve (8), and the hollow conductive tube (103) is movably nested in the rotating sleeve (8) via an outer copper sleeve (802).

3. The reusable threaded short-circuit device according to claim 1, characterized in that: The sealing ring (106) is a sealing O-ring made of fluororubber.

4. The reusable threaded short-circuit device according to claim 1, characterized in that: The insulating needle (102) and the insulating ring (104) are made of polyetheretherketone (PEEK) material.

5. The reusable threaded short-circuit device according to claim 1, characterized in that: One end of the insulating ring (104) is also provided with a threaded hole (107) for fixing.

6. The reusable threaded short-circuit device according to claim 1, characterized in that: A metal ring (105) for bearing pressure is also nested outside the insulating ring (104), and a limited step is provided between the metal ring (105) and the insulating ring (104).

7. The reusable threaded short-circuit device according to claim 6, characterized in that: The metal ring (105) is made of 40CrMo metal material.

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