WO2021212264A1 - 一种用于井下工具串的湿接头及井下工具串 - Google Patents

一种用于井下工具串的湿接头及井下工具串 Download PDF

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Publication number
WO2021212264A1
WO2021212264A1 PCT/CN2020/085592 CN2020085592W WO2021212264A1 WO 2021212264 A1 WO2021212264 A1 WO 2021212264A1 CN 2020085592 W CN2020085592 W CN 2020085592W WO 2021212264 A1 WO2021212264 A1 WO 2021212264A1
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Prior art keywords
cavity
insulating
opening
conductive core
wet joint
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PCT/CN2020/085592
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English (en)
French (fr)
Inventor
张强
赵梦盼
曾琦军
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成都维锐泰达能源技术有限公司
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Application filed by 成都维锐泰达能源技术有限公司 filed Critical 成都维锐泰达能源技术有限公司
Priority to PCT/CN2020/085592 priority Critical patent/WO2021212264A1/zh
Priority to US17/420,394 priority patent/US11359441B2/en
Publication of WO2021212264A1 publication Critical patent/WO2021212264A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
    • H01R13/523—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases for use under water
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/028—Electrical or electro-magnetic connections
    • E21B17/0285—Electrical or electro-magnetic connections characterised by electrically insulating elements
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/15—Pins, blades or sockets having separate spring member for producing or increasing contact pressure
    • H01R13/17—Pins, blades or sockets having separate spring member for producing or increasing contact pressure with spring member on the pin
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
    • H01R13/521—Sealing between contact members and housing, e.g. sealing insert

Definitions

  • the invention relates to the field of petroleum downhole construction, in particular to a wet joint used for downhole tool strings and downhole tool strings.
  • the technical problem to be solved by the present invention is to provide a wet joint and a downhole tool string for a downhole tool string to reduce the size of the entire wet joint.
  • a wet joint for downhole tool string further comprising:
  • An insulating material body having a first cavity, and insulating oil is arranged in the first cavity;
  • Conductive core one end of the conductive core is used for electrical connection with the outside and sealed connection with one end of the first cavity; the other end of the conductive core has a conductive core inner cavity electrically connected with a male connector, and is close to the The inner surface of the other end of the first cavity; the inner cavity of the conductive core is in communication with the first cavity, and the other end of the first cavity has a first that matches the inner diameter of the inner cavity of the conductive core. Opening
  • the insulated piston is hermetically connected to the first opening through a first sealing element, the insulated piston is connected to the inner cavity of the conductive core through an elastic component, and when the male connector abuts against the insulated piston And move to the bottom of the inner cavity of the conductive core, and the male connector is in contact with and electrically connected to the inner cavity of the conductive core.
  • the conductive core is arranged in the first cavity in the main body of the insulating material, and the first cavity is filled with insulating oil.
  • the whole structure is very simple, compact, and the size is very small;
  • the two-layer insulation protection of the oil and the main body of insulating material achieves a good downhole insulation effect;
  • the insulating piston part is hermetically connected with the first opening through the first sealing element, and when the male joint is connected to the insulating piston
  • the plug abuts and moves to the bottom of the inner cavity of the conductive core, and when the male connector contacts and is electrically connected to the inner cavity of the conductive core, the insulating oil in the first cavity is compressed, so that the insulating oil in the first cavity is compressed.
  • the pressure of the oil is greater than the pressure of the well fluid outside the wet joint to ensure that the well fluid does not enter the first cavity, so that the wet joint maintains a good insulation effect.
  • the present invention can also be improved as follows.
  • the second cavity is made of insulating material and is provided with insulating oil
  • the second cavity is provided with a second opening
  • the second opening passes through the second cavity.
  • the two sealing elements are in sealed connection with the insulating piston, and an insulating elastic film is arranged between the first cavity and the second cavity; when the insulating oil in the first cavity is pressed, the insulating elastic The membrane moves to the second cavity.
  • the beneficial effect of adopting the above-mentioned further solution is that when the male connector abuts the insulating piston member and moves to the bottom of the inner cavity of the conductive core, and the male connector contacts and is electrically connected to the inner cavity of the conductive core, the first The insulating oil in the cavity is compressed, and the insulating elastic film is moved to the second cavity under the pressure of the insulating oil in the first cavity, so that the insulating oil in the second cavity is compressed, so that the insulating oil in the second cavity is compressed.
  • the oil pressure is greater than the well fluid pressure outside the wet joint, ensuring that the well fluid will not enter the second cavity, forming a secondary insulation protection, and further improving the insulation effect of the wet joint; furthermore, due to the use of a balanced type of insulating elastic film Designed to respond to pressure fluctuations in time and improve the insulation reliability of wet joints.
  • the present invention can also be improved as follows.
  • the insulating elastic film is an insulating elastic capsule
  • the insulating elastic capsule is disposed between the third cavity and the first cavity, and the first cavity is connected to the The insulating elastic capsule is in communication, the outer wall of the insulating elastic capsule is located in the third cavity, and the third cavity is in communication with the second cavity.
  • the beneficial effect of adopting the above-mentioned further solution is that due to the addition of the third cavity, the insulating elastic film is arranged between the third cavity and the first cavity, so that the insulating elastic film can be provided with a larger area and improve In order to respond to pressure fluctuations in a timely manner, the insulation reliability of the wet joint is further improved.
  • the present invention can also be improved as follows.
  • first cavity and the second cavity are both arranged in the insulating material body, and the third cavity is arranged outside the insulating material body; further comprising an insulating housing, the insulating housing Covering the first cavity, the second cavity and the third cavity
  • the insulating housing is provided with a third opening matching the second opening, and the third opening is formed
  • the second sealing element is hermetically connected with the insulating piston member.
  • the beneficial effect of adopting the above-mentioned further solution is: by providing an insulating shell, the insulating effect of the entire wet joint is further improved; in addition, if the third cavity is arranged outside the insulating material main body, the volume of the third cavity is increased, and the volume of the third cavity is increased.
  • the oil storage capacity of the third cavity is improved, which improves the insulation effect of the wet joint.
  • the volume of the third cavity increases, the area of the insulating elastic film arranged in the third cavity will increase. Further improve the timeliness of response to pressure fluctuations.
  • the present invention can also be improved as follows.
  • it further includes: a metal casing covering the insulating casing, a fourth opening matching the third opening is provided on the metal casing, and a diameter of the fourth opening is larger than that of the third opening.
  • the caliber of the opening is not limited to: a metal casing covering the insulating casing, a fourth opening matching the third opening is provided on the metal casing, and a diameter of the fourth opening is larger than that of the third opening.
  • the beneficial effect of adopting the above-mentioned further solution is: adopting a metal shell to protect the wet joint from being damaged; at the same time, it can also play a role of electromagnetic shielding.
  • the present invention can also be improved as follows.
  • a guide cone surface is provided at the fourth opening, and the guide cone surface matches the shape of the male joint.
  • the beneficial effect of adopting the above-mentioned further solution is that the guiding cone surface ensures a good guiding effect during the insertion process with the male connector, and no position shift occurs.
  • the present invention can also be improved as follows.
  • the abutting end of the insulating piston member and the male connector is provided with a positioning groove, and the positioning groove is coaxial with the male connector.
  • the beneficial effect of adopting the above-mentioned further solution is that the positioning groove is coaxial with the male connector, which ensures that the male connector is inserted into the inner cavity of the conductive core very smoothly.
  • the present invention can also be improved as follows.
  • the cavity of the inner cavity of the conductive core is provided with a plurality of through holes, and the through holes are in communication with the first cavity.
  • the beneficial effect of adopting the above-mentioned further solution is: the multiple through holes on the cavity of the conductive core ensure that the male connector is inserted into the cavity of the conductive core, and the oil pressure in the cavity of the conductive core is timely transmitted to the first cavity. .
  • the present invention can also be improved as follows.
  • the elastic member is a spring.
  • the spring is a commonly used elastic component and has good elastic deformation recovery ability.
  • the present invention also provides a downhole tool string, further comprising a wet joint connected with the cable, and the wet joint is the above-mentioned wet joint.
  • the downhole tool string of the present invention has the following beneficial effects: since the conductive core of the wet joint of the downhole tool string is arranged in the first cavity in the main body of the insulating material, and the first cavity is filled with insulating oil, the entire structure is very simple and compact.
  • the size is very small; at the same time, a good downhole insulation effect is achieved through the two-layer insulation protection of the insulating oil and the main body of the insulating material; furthermore, the insulating piston part is hermetically connected with the first opening through the first sealing element,
  • the male connector abuts the insulating piston member and moves to the bottom of the inner cavity of the conductive core, and the male connector contacts and is electrically connected to the inner cavity of the conductive core, the insulating oil in the first cavity is compressed, The pressure of the insulating oil in the first cavity is greater than the pressure of the well fluid outside the wet joint, which ensures that the well fluid does not enter the first cavity, so that the wet joint maintains a good insulation effect; and the reliability of the downhole tool string is ensured.
  • Figure 1 is a cross-sectional view of an embodiment of the present invention
  • FIG. 2 is a cross-sectional view of an insulating piston member 3 separated from the main body according to an embodiment of the present invention
  • Figure 3 is a cross-sectional view of the second embodiment of the present invention.
  • Figure 4 is a partial view of A in Figure 3;
  • FIG. 5 is a cross-sectional view of the second embodiment of the present invention separated from the male connector 9;
  • FIG. 6 is a cross-sectional view of the second embodiment of the present invention and the male connector 9 in cooperation.
  • Main body of insulating material 11, first cavity, 12, first opening, 13, internal flow channel, 2. conductive core, 21, inner cavity of conductive core, 3. insulated piston, 31, first sealing element, 32.
  • a wet joint used for downhole tool strings further comprising:
  • the insulating material body 1 has a first cavity 11 in which insulating oil is arranged.
  • a second cavity 4 the second cavity 4 is made of insulating material and is provided with insulating oil, the second cavity 4 is provided with a second opening 41, the second opening 41 passes through the second sealing element 42 is in hermetically connected with the insulating piston part 3, and an insulating elastic film 5 is provided between the first cavity 11 and the second cavity 4; when the insulating oil in the first cavity 11 is under pressure, the insulating elastic film 5 faces the second cavity Body 4 moves.
  • a third cavity 6 the insulating elastic film 5 is an insulating elastic capsule, the insulating elastic capsule is arranged between the third cavity 6 and the first cavity 11, that is, one end of the insulating elastic capsule is arranged in the first cavity
  • One end of the body 11 and the other end of the edge elastic capsule are fixedly connected to one end of the external wire 10;
  • the hole communicates with the inner cavity of the insulating elastic capsule; the outer wall of the insulating elastic capsule is located in the third cavity 6, and the third cavity 6 communicates with the second cavity 4.
  • the first cavity 11, the second cavity 4 and the third cavity 6 are all arranged in the insulating material body 1.
  • Conductive core 2 one end of the conductive core 2 is used for electrical connection with the outside, that is, it is connected to the external wire 10, and is hermetically connected to one end of the first cavity 11; the other end of the conductive core 2 has a conductive core electrically connected to the male connector 9
  • the inner cavity 21 is close to the inner surface of the other end of the first cavity 11; the conductive core inner cavity 21 is in communication with the first cavity 11, and the other end of the first cavity 11 has an inner diameter matching the inner diameter of the conductive core inner cavity 21 First opening 12;
  • Insulated piston part 3 the insulated piston part 3 is connected to the first opening 12 through the first sealing element 31, the insulated piston part 3 is connected to the conductive core cavity 21 through the elastic part 32, when the male joint 9 is in contact with the insulated piston part 3 And move to the bottom of the inner cavity 21 of the conductive core, and the male connector 9 is in contact with and electrically connected to the inner cavity 21 of the conductive core.
  • the abutting end of the insulating piston 3 and the male connector 9 is provided with a positioning groove 33, and the positioning groove 33 is coaxial with the male connector 9.
  • the insulating housing 7 which covers the first cavity 11, the second cavity 4, and the third cavity 6 and the insulating housing 7 is provided with a third opening 71 matching the second opening 41, and the third opening 71 It is connected to the insulating piston part 3 in a hermetic manner.
  • the insulating housing 7 is a rubber sleeve, and the rubber sleeve forms a second sealing element 42 at the third opening 71 so as to be connected to the insulating piston 3 in a sealed manner.
  • it further includes: a metal casing 8 covering the insulating casing 7, and the metal casing 8 is provided with a fourth opening 81 matching the third opening 71, and the fourth opening 81 has a larger diameter than the third opening 71 caliber.
  • a guiding cone 82 is provided at the fourth opening 81, and the guiding cone 82 matches the shape of the male connector 9.
  • the working principle of the present invention is: when the male connector 9 abuts against the insulating piston member 3 and moves to the bottom of the conductive core cavity 21, and the male connector 9 contacts and is electrically connected to the conductive core cavity 21, the first cavity 11
  • the insulating oil is compressed, and the insulating elastic membrane 5 is moved by the pressure of the insulating oil in the first cavity 11 and the third cavity 6 moves, and at the same time, the insulating oil in the third cavity 6 flows to the second cavity through the internal flow passage 13 4 flows so that the insulating oil in the second cavity 4 is compressed, so that the pressure of the insulating oil in the second cavity 4 is greater than the pressure of the well fluid outside the wet joint, ensuring that the well fluid does not enter the second cavity 4, A secondary insulation protection is formed, which further improves the insulation effect of the wet joint; in addition, due to the balanced design of the insulating elastic membrane 5, the pressure fluctuation feedback is timely and the insulation reliability of the wet joint is improved.
  • only one cavity may be provided, that is, the conductive core 2 is arranged in the first cavity 11 in the insulating material body 1, and the first cavity 11 is filled with insulating oil.
  • the entire structure is very simple and compact. The size is very small; at the same time, a good downhole insulation effect is achieved through the two-layer insulation protection of the insulating oil and the insulating material body 1; furthermore, the insulating piston part 3 is hermetically connected to the first opening 12 through the first sealing element 31,
  • the male connector 9 abuts against the insulating piston member 3 and moves to the bottom of the conductive core cavity 21, and the male connector 9 contacts and is electrically connected to the conductive core cavity 21, the insulating oil in the first cavity 11 is compressed, so that the first cavity 11 is compressed.
  • the pressure of the insulating oil in a cavity 11 is greater than the pressure of the well fluid outside the wet joint, which ensures that the well fluid does not enter the first cavity 11, so that the wet joint maintains a good insulation effect.
  • two cavities can also be directly provided, the first cavity 11 and the second cavity 4 are both located in the insulating material body 1, and the second cavity 4 passes through the internal flow channel and the first cavity 11.
  • an insulating elastic film 5 is provided between the first cavity 11 and the second cavity 4; when the insulating oil in the first cavity 11 is under pressure, the insulating elastic film 5 moves to the second cavity 4.
  • the membrane 5 is subjected to the pressure of the insulating oil in the first cavity 11 to move to the second cavity 4, flow into the second cavity 4 through the internal flow channel, and make the insulating oil in the second cavity 4 be compressed, making the second cavity 4
  • the pressure of the insulating oil in the cavity 4 is greater than the pressure of the well fluid outside the wet joint, ensuring that well fluid will not enter the second cavity 4, forming a secondary insulation protection, and further improving the insulation effect of the wet joint; Due to the balanced design of the insulating elastic membrane 5, the pressure fluctuation feedback is timely, and the insulation reliability of the wet joint is improved.
  • first cavity 11 and the second cavity 4 are both arranged in the insulating material body 1, and the third cavity 6 is arranged in The outside of the main body 1 of insulating material.
  • the third cavity 6 is arranged outside the insulating material body 1, and the volume of the third cavity 6 is increased, which increases the oil storage capacity of the third cavity 6, which improves the insulation effect of the wet joint; As the volume of the third cavity 6 increases, the area of the insulating elastic membrane 5 provided in the third cavity 6 will increase, which further improves the timeliness of response to pressure fluctuation feedback.
  • the elastic component 32 is a spring. In a specific embodiment, other elastic components can be used to meet different requirements.
  • the cavity of the inner cavity 21 of the conductive core is provided with a plurality of through holes, and the through holes are communicated with the first cavity 11.
  • the multiple through holes on the cavity of the conductive core cavity 21 ensure that the male connector 9 is inserted into the conductive core cavity 21 and the oil pressure in the conductive core cavity 21 is transmitted to the first cavity 11 in time.
  • the male connector 9 also includes a male connector conductive ferrule 91 and an insulating sleeve 92.
  • the male connector conductive ferrule 91 is cone-shaped and has a positioning recess for the wet connector.
  • the groove 33 is also provided in the shape of a conical groove. In the process of inserting the male connector 9 with the second embodiment of the present invention, first, the male connector conductive ferrule 91 enters the fourth opening of the metal shell 8 through the guide cone 82 81, and then contact with the positioning groove 33.
  • the positioning groove 33 is coaxial with the male connector 9, that is, the positioning groove 33 is coaxial with the male connector conductive ferrule 91, ensuring that the outer diameter of the male connector conductive ferrule 91 is insulated
  • the outer diameters of the piston 3 are coplanar, and the male connector conductive insert 91 pushes the insulating piston 3 to move to the conductive core cavity 21.
  • the male connector 9 matches the guide cone 82 at the fourth opening 81, the structure and guide When the tapered surface 82 contacts and fits, the male connector 9 stops pushing the insulating piston member 3, and the male connector conductive insert 91 completely enters the conductive core inner cavity 21 and is electrically connected to it.
  • the part of the insulating sleeve 92 of the male connector 9 located in the wet connector is in sealing contact with the first sealing element 31 and the second sealing element 42 to form a double-layer sealing structure.
  • the insulating elastic film 5 is moved by the pressure of the insulating oil in the first cavity 11 and the third cavity 6 moves, and at the same time, the insulating oil in the third cavity 6 moves.
  • the embodiment of the present invention also provides a downhole tool string, which further includes a wet joint connected with the cable, and the wet joint is the above-mentioned wet joint.
  • the working principle and beneficial effects of the downhole tool string of the present invention are: since the conductive core 2 of the wet joint of the downhole tool string is arranged in the first cavity 11 in the insulating material body 1, the first cavity 11 is filled with insulating oil, The whole structure is very simple, compact, and very small in size; at the same time, through the two-layer insulation protection of the insulating oil and the insulating material body 1, a good downhole insulation effect is achieved; furthermore, the insulating piston part 3 passes through the first sealing element 31 and The first opening 12 is hermetically connected.
  • the male connector 9 When the male connector 9 abuts against the insulating piston member 3 and moves to the bottom of the conductive core cavity 21, and the male connector 9 contacts and is electrically connected to the conductive core cavity 21, the first cavity 11
  • the insulating oil is compressed so that the pressure of the insulating oil in the first cavity 11 is greater than the pressure of the well fluid outside the wet joint, ensuring that well fluid will not enter the first cavity 11, so that the wet joint maintains a good insulation effect; The reliability of the downhole tool string.

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Abstract

一种用于井下工具串的湿接头及井下工具串，绝缘材料主体（1）具有第一腔体（11），第一腔体（11）内设置有绝缘油；导电芯（2）和导电芯内腔（21）与第一腔体（11）连通；绝缘活塞件（3）通过第一密封元件（31）与第一开口（12）密封连接，当公接头（9）与绝缘活塞件（3）抵接并向导电芯内腔（21）底部移动，公接头（9）与导电芯内腔（21）接触并电连接时，第一腔体（11）中的绝缘油被压缩，使得第一腔体（11）中的绝缘油的压力大于湿接头外部的井液压力，确保井液不会进入第一腔体（11）内，使得湿接头保持良好的绝缘效果。

Description

一种用于井下工具串的湿接头及井下工具串 技术领域
本发明涉及石油井下施工领域，具体涉及一种用于井下工具串的湿接头及井下工具串。
背景技术
石油井下施工中需要用到电缆线等工具串，由于井筒内径比较小，现有的湿接头整体尺寸较大，不便于进行电连接和其他井下作业。
发明内容
本发明所要解决的技术问题是提供一种用于井下工具串的湿接头及井下工具串，减小整个湿接头的尺寸。
本发明解决上述技术问题的技术方案如下：一种用于井下工具串的湿接头，还包括：
绝缘材料主体，所述绝缘材料主体具有第一腔体，所述第一腔体内设置有绝缘油；
导电芯，所述导电芯的一端用于与外部电连接，并与所述第一腔体的一端密封连接；所述导电芯另一端具有与公接头电连接的导电芯内腔，并靠近所述第一腔体的另一端的内表面；所述导电芯内腔与所述第一腔体连通，所述第一腔体的另一端具有与所述导电芯内腔的内径匹配的第一开口；
绝缘活塞件，所述绝缘活塞件通过第一密封元件与所述第一开口密封连接，所述绝缘活塞件通过弹性部件与导电芯内腔连接，当所述公接头与所述绝缘活塞件抵接并向所述导电芯内腔底部移动，所述公接头与所述导电芯内腔接触并电连接。
本发明的工作原理及有益效果是：导电芯设置在绝缘材料主体内的第一腔体中，在第一腔体中充满绝缘油，整个结构非常简单，紧凑，尺寸非常小； 同时，通过绝缘油和绝缘材料主体的两层绝缘防护，达到了很好的井下绝缘效果；再有，所述绝缘活塞件通过第一密封元件与所述第一开口密封连接，当公接头与所述绝缘活塞件抵接并向所述导电芯内腔底部移动，所述公接头与所述导电芯内腔接触并电连接时，第一腔体中的绝缘油被压缩，使得第一腔体中的绝缘油的压力大于湿接头外部的井液压力，确保井液不会进入第一腔体内，使得湿接头保持良好的绝缘效果。
在上述技术方案的基础上，本发明还可以做如下改进。
进一步，还包括：第二腔体，所述第二腔体由绝缘材料制成，并在其内设置有绝缘油，所述第二腔体设置有第二开口，所述第二开口通过第二密封元件与所述绝缘活塞件密封连接，所述第一腔体和所述第二腔体之间设置有绝缘弹性膜；当所述第一腔体内绝缘油受到压力时，所述绝缘弹性膜向所述第二腔体移动。
采用上述进一步方案的有益效果是：当公接头与所述绝缘活塞件抵接并向所述导电芯内腔底部移动，所述公接头与所述导电芯内腔接触并电连接时，第一腔体中的绝缘油被压缩，绝缘弹性膜受到第一腔体中的绝缘油的压力向第二腔体移动，使得第二腔体中的绝缘油被压缩，使得第二腔体中的绝缘油的压力大于湿接头外部的井液压力，确保井液不会进入第二腔体内，形成了二次绝缘保护，进一步提高了湿接头的绝缘效果；再有，由于采用绝缘弹性膜的平衡式设计，应对压力波动反馈及时，提高了湿接头的绝缘可靠性。
在上述技术方案的基础上，本发明还可以做如下改进。
进一步，还包括：第三腔体，所述绝缘弹性膜为绝缘弹性胶囊，所述绝缘弹性胶囊设置在所述第三腔体和所述第一腔体之间，所述第一腔体与所述绝缘弹性胶囊连通，所述绝缘弹性胶囊的外壁位于所述所述第三腔体内，所述第三腔体与所述第二腔体连通。
采用上述进一步方案的有益效果是：由于增设第三腔体，将绝缘弹性膜 设置在所述第三腔体和所述第一腔体之间，这样绝缘弹性膜就可以设置较大面积，提高了应对压力波动反馈及时，进一步提高了湿接头的绝缘可靠性。
在上述技术方案的基础上，本发明还可以做如下改进。
进一步，所述第一腔体和所述第二腔体都设置在所述绝缘材料主体内，所述第三腔体设置在所述绝缘材料主体的外部；还包括绝缘外壳，所述绝缘外壳包覆所述所述第一腔体、所述第二腔体和所述第三腔体所述绝缘外壳上设置有与所述第二开口匹配的第三开口，所述第三开口处形成第二密封元件与所述绝缘活塞件密封连接。
采用上述进一步方案的有益效果是：通过设置绝缘外壳，进一步提高整个湿接头的绝缘效果；另外，将第三腔体设置在所述绝缘材料主体的外部，第三腔体的容积增大，增加了第三腔体的储油量，这样提高了湿接头的绝缘效果；再有，因为第三腔体的容积增大，设置在第三腔体中的绝缘弹性膜的面积就会增大，进一步提高了应对压力波动反馈及时性。
在上述技术方案的基础上，本发明还可以做如下改进。
进一步，还包括：金属外壳，所述金属外壳包覆所述绝缘外壳，所述金属外壳上设置有与所述第三开口匹配的第四开口，所述第四开口的口径大于所述第三开口的口径。
采用上述进一步方案的有益效果是：采用金属外壳，保护湿接头不被损坏；同时，还可以起到电磁屏蔽的作用。
在上述技术方案的基础上，本发明还可以做如下改进。
进一步，所述第四开口处设置有导向锥面，所述导向锥面与公接头形状匹配。
采用上述进一步方案的有益效果是：通过导向锥面确保在与公接头的插接过程中起到良好的导向作用，不会发生位置偏移。
在上述技术方案的基础上，本发明还可以做如下改进。
进一步，所述绝缘活塞件与公接头抵接端设置有定位凹槽，所述定位凹 槽与所述公接头同轴。
采用上述进一步方案的有益效果是：定位凹槽与所述公接头同轴，确保公接头非常顺利插接入导电芯内腔。
在上述技术方案的基础上，本发明还可以做如下改进。
进一步，所述导电芯内腔的腔体上设置有多个通孔，所述通孔与所述第一腔体连通。
采用上述进一步方案的有益效果是：导电芯内腔的腔体上的多个通孔，确保公接头在插接入导电芯内腔中，导电芯内腔的油压及时传递给第一腔体。
在上述技术方案的基础上，本发明还可以做如下改进。
进一步，所述弹性部件为弹簧。
采用上述进一步方案的有益效果是：弹簧是一种常用的弹性部件，具有良好的弹性形变恢复能力。
本发明还提供一种井下工具串，还包括与电缆连接的湿接头，所述湿接头为上述的湿接头。
本发明井下工具串的有益效果是：由于井下工具串的湿接头的导电芯设置在绝缘材料主体内的第一腔体中，在第一腔体中充满绝缘油，整个结构非常简单，紧凑，尺寸非常小；同时，通过绝缘油和绝缘材料主体的两层绝缘防护，达到了很好的井下绝缘效果；再有，所述绝缘活塞件通过第一密封元件与所述第一开口密封连接，当公接头与所述绝缘活塞件抵接并向所述导电芯内腔底部移动，所述公接头与所述导电芯内腔接触并电连接时，第一腔体中的绝缘油被压缩，使得第一腔体中的绝缘油的压力大于湿接头外部的井液压力，确保井液不会进入第一腔体内，使得湿接头保持良好的绝缘效果；确保了井下工具串工作的可靠性。
附图说明
图1是本发明实施例一剖视图；
图2是本发明实施例一种绝缘活塞件3与主体分离的剖视图；
图3是本发明实施例二剖视图；
图4是图3中A的局部视图；
图5是本发明实施例二与公接头9分离的剖视图；
图6是本发明实施例二与公接头9配合的剖视图。
附图中，各标号所代表的部件列表如下：
1、绝缘材料主体，11、第一腔体，12、第一开口，13、内部流道，2、导电芯，21、导电芯内腔，3、绝缘活塞件，31、第一密封元件，32、弹性部件，33、定位凹槽，4、第二腔体，41、第二开口，42、第二密封元件，5、绝缘弹性膜，6、第三腔体，7、绝缘外壳，71、第三开口，8、金属外壳，81、第四开口，82、导向锥面，9、公接头，91、公接头导电插芯，92、绝缘套，10、外部导线。
具体实施方式
以下结合附图对本发明的原理和特征进行描述，所举实例只用于解释本发明，并非用于限定本发明的范围。
本发明实施例一的示意图参见图1和图2。一种用于井下工具串的湿接头，还包括：
绝缘材料主体1，绝缘材料主体1具有第一腔体11，第一腔体11内设置有绝缘油。
还包括：第二腔体4，第二腔体4由绝缘材料制成，并在其内设置有绝缘油，第二腔体4设置有第二开口41，第二开口41通过第二密封元件42与绝缘活塞件3密封连接，第一腔体11和第二腔体4之间设置有绝缘弹性 膜5；当第一腔体11内绝缘油受到压力时，绝缘弹性膜5向第二腔体4移动。
以及，还包括：第三腔体6，绝缘弹性膜5为绝缘弹性胶囊，绝缘弹性胶囊设置在第三腔体6和第一腔体11之间，即绝缘弹性胶囊的一端设置在第一腔体11的一端，缘弹性胶囊的另一端与外部导线10的一端固定连接；第一腔体11与绝缘弹性胶囊内腔连通，即设置在第一腔体11内的导电芯内腔21通过通孔与绝缘弹性胶囊内腔连通连通；绝缘弹性胶囊的外壁位于第三腔体6内，第三腔体6与第二腔体4连通。
其中，第一腔体11、第二腔体4和第三腔体6都设置在绝缘材料主体1内。
导电芯2，导电芯2的一端用于与外部电连接，即与外部导线10连接，并与第一腔体11的一端密封连接；导电芯2另一端具有与公接头9电连接的导电芯内腔21，并靠近第一腔体11的另一端的内表面；导电芯内腔21与第一腔体11连通，第一腔体11的另一端具有与导电芯内腔21的内径匹配的第一开口12；
绝缘活塞件3，绝缘活塞件3通过第一密封元件31与第一开口12密封连接，绝缘活塞件3通过弹性部件32与导电芯内腔21连接，当公接头9与绝缘活塞件3抵接并向导电芯内腔21底部移动，公接头9与导电芯内腔21接触并电连接。同时，绝缘活塞件3与公接头9抵接端设置有定位凹槽33，定位凹槽33与公接头9同轴。
还包括绝缘外壳7，绝缘外壳7包覆第一腔体11、第二腔体4和第三腔体6绝缘外壳7上设置有与第二开口41匹配的第三开口71，第三开口71与绝缘活塞件3密封连接。在本实施例中，绝缘外壳7为橡胶套，该橡胶套在第三开口71形成第二密封元件42，使得与绝缘活塞件3密封连接。
在本实施例中，还包括：金属外壳8，金属外壳8包覆绝缘外壳7，金属外壳8上设置有与第三开口71匹配的第四开口81，第四开口81的口径大于第三开口71的口径。同时，第四开口81处设置有导向锥面82，导向锥面 82与公接头9形状匹配。
本发明的工作原理是：当公接头9与绝缘活塞件3抵接并向导电芯内腔21底部移动，公接头9与导电芯内腔21接触并电连接时，第一腔体11中的绝缘油被压缩，绝缘弹性膜5受到第一腔体11中的绝缘油的压力项第三腔体6移动，同时，第三腔体6中的绝缘油通过内部流道13向第二腔体4流动，使得第二腔体4中的绝缘油被压缩，使得第二腔体4中的绝缘油的压力大于湿接头外部的井液压力，确保井液不会进入第二腔体4内，形成了二次绝缘保护，进一步提高了湿接头的绝缘效果；再有，由于采用绝缘弹性膜5的平衡式设计，应对压力波动反馈及时，提高了湿接头的绝缘可靠性。
在具体实施中，也可以只设置一个腔体，即导电芯2设置在绝缘材料主体1内的第一腔体11中，在第一腔体11中充满绝缘油，整个结构非常简单，紧凑，尺寸非常小；同时，通过绝缘油和绝缘材料主体1的两层绝缘防护，达到了很好的井下绝缘效果；再有，绝缘活塞件3通过第一密封元件31与第一开口12密封连接，当公接头9与绝缘活塞件3抵接并向导电芯内腔21底部移动，公接头9与导电芯内腔21接触并电连接时，第一腔体11中的绝缘油被压缩，使得第一腔体11中的绝缘油的压力大于湿接头外部的井液压力，确保井液不会进入第一腔体11内，使得湿接头保持良好的绝缘效果。
在具体实施例中，也可以直接设置两个腔体，第一腔体11和第二腔体4都位于绝缘材料主体1中，第二腔体4通关过内部流道与第一腔体11连通，同时，第一腔体11和第二腔体4之间设置有绝缘弹性膜5；当第一腔体11内绝缘油受到压力时，绝缘弹性膜5向第二腔体4移动。
当公接头9与绝缘活塞件3抵接并向导电芯内腔21底部移动，公接头9与导电芯内腔21接触并电连接时，第一腔体11中的绝缘油被压缩，绝缘弹性膜5受到第一腔体11中的绝缘油的压力向第二腔体4移动，通过内部流道流入第二腔体4，并使得第二腔体4中的绝缘油被压缩，使得第二腔体4中的绝缘油的压力大于湿接头外部的井液压力，确保井液不会进入第二腔体 4内，形成了二次绝缘保护，进一步提高了湿接头的绝缘效果；再有，由于采用绝缘弹性膜5的平衡式设计，应对压力波动反馈及时，提高了湿接头的绝缘可靠性。
本发明实施例二的结构示意图参见图2和图3，与实施例一的区别在于，第一腔体11和第二腔体4都设置在绝缘材料主体1内，第三腔体6设置在绝缘材料主体1的外部。
将第三腔体6设置在绝缘材料主体1的外部，第三腔体6的容积增大，增加了第三腔体6的储油量，这样提高了湿接头的绝缘效果；再有，因为第三腔体6的容积增大，设置在第三腔体6中的绝缘弹性膜5的面积就会增大，进一步提高了应对压力波动反馈及时性。
在上述两个实施例中，弹性部件32为弹簧，在具体实施例中，可以采用其他具有弹性的部件以适应不同的要求。
在上述两个实施例中，导电芯内腔21的腔体上设置有多个通孔，通孔与第一腔体11连通。导电芯内腔21的腔体上的多个通孔，确保公接头9在插接入导电芯内腔21中，导电芯内腔21的油压及时传递给第一腔体11。
本发明实施例二与公接头9配合的示意图参见图5和图6，公接头9还包括公接头导电插芯91和绝缘套92，公接头导电插芯91为圆锥状，湿接头的定位凹槽33与之对应也设置为圆锥凹槽状，在公接头9与本发明实施例二插接的过程中，首先，公接头导电插芯91通过导向锥面82进入金属外壳8的第四开口81，然后与定位凹槽33接触，由于定位凹槽33与公接头9同轴，也就是定位凹槽33与公接头导电插芯91同轴，确保公接头导电插芯91的外径与绝缘活塞件3的外径共面，公接头导电插芯91推动绝缘活塞件3向导电芯内腔21移动，当公接头9上与第四开口81处的导向锥面82项匹配的结构与导向锥面82接触配合时，公接头9停止推动绝缘活塞件3，公接头导电插芯91完全进入导电芯内腔21内，并与其电连接。此时，公接头9的绝缘套92位于湿接头内的部分与第一密封元件31和第二密封元件42密 封接触，形成双层密封结构。
同时，由于第一腔体11中的绝缘油被压缩，绝缘弹性膜5受到第一腔体11中的绝缘油的压力项第三腔体6移动，同时，第三腔体6中的绝缘油通过内部流道13向第二腔体4流动，使得第二腔体4中的绝缘油被压缩，使得第二腔体4中的绝缘油的压力大于湿接头外部的井液压力，确保井液不会进入第二腔体4内，形成了二次绝缘保护，进一步提高了湿接头的绝缘效果。
本发明的实施例还提供一种井下工具串，还包括与电缆连接的湿接头，湿接头为上述的湿接头。
本发明井下工具串的工作原理及有益效果是：由于井下工具串的湿接头的导电芯2设置在绝缘材料主体1内的第一腔体11中，在第一腔体11中充满绝缘油，整个结构非常简单，紧凑，尺寸非常小；同时，通过绝缘油和绝缘材料主体1的两层绝缘防护，达到了很好的井下绝缘效果；再有，绝缘活塞件3通过第一密封元件31与第一开口12密封连接，当公接头9与绝缘活塞件3抵接并向导电芯内腔21底部移动，公接头9与导电芯内腔21接触并电连接时，第一腔体11中的绝缘油被压缩，使得第一腔体11中的绝缘油的压力大于湿接头外部的井液压力，确保井液不会进入第一腔体11内，使得湿接头保持良好的绝缘效果；确保了井下工具串工作的可靠性。
以上仅为本发明的较佳实施例，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种用于井下工具串的湿接头，其特征在于，包括：
    绝缘材料主体，所述绝缘材料主体具有第一腔体，所述第一腔体内设置有绝缘油；
    导电芯，所述导电芯的一端用于与外部电连接，并与所述第一腔体的一端密封连接；所述导电芯另一端具有与公接头电连接的导电芯内腔，并靠近所述第一腔体的另一端的内表面；所述导电芯内腔与所述第一腔体连通，所述第一腔体的另一端具有与所述导电芯内腔的内径匹配的第一开口；
    绝缘活塞件，所述绝缘活塞件通过第一密封元件与所述第一开口密封连接，所述绝缘活塞件通过弹性部件与导电芯内腔连接，当所述公接头与所述绝缘活塞件抵接并向所述导电芯内腔底部移动，所述公接头与所述导电芯内腔接触并电连接。
  2. 根据权利要求1所述的一种用于井下工具串的湿接头，其特征在于，还包括：
    第二腔体，所述第二腔体由绝缘材料制成，并在其内设置有绝缘油，所述第二腔体设置有第二开口，所述第二开口通过第二密封元件与所述绝缘活塞件密封连接，所述第一腔体和所述第二腔体之间设置有绝缘弹性膜；当所述第一腔体内绝缘油受到压力时，所述绝缘弹性膜向所述第二腔体移动。
  3. 根据权利要求2所述的一种用于井下工具串的湿接头，其特征在于，还包括：
    第三腔体，所述绝缘弹性膜为绝缘弹性胶囊，所述绝缘弹性胶囊设置在所述第三腔体和所述第一腔体之间，所述第一腔体与所述绝缘弹性胶囊连通，所述绝缘弹性胶囊的外壁位于所述所述第三腔体内，所述第三腔体与所述第二腔体连通。
  4. 根据权利要求3所述的一种用于井下工具串的湿接头，其特征在于， 还包括：
    所述第一腔体和所述第二腔体都设置在所述绝缘材料主体内；还包括绝缘外壳，所述绝缘外壳包覆所述所述第一腔体、所述第二腔体和所述第三腔体所述绝缘外壳上设置有与所述第二开口匹配的第三开口，所述第三开口处形成第二密封元件与所述绝缘活塞件密封连接。
  5. 根据权利要求4所述的一种用于井下工具串的湿接头，其特征在于，还包括：
    金属外壳，所述金属外壳包覆所述绝缘外壳，所述金属外壳上设置有与所述第三开口匹配的第四开口，所述第四开口的口径大于所述第三开口的口径。
  6. 根据权利要求5所述的一种用于井下工具串的湿接头，其特征在于，所述第四开口处设置有导向锥面，所述导向锥面与公接头形状匹配。
  7. 根据权利要求1至6任一项所述的一种用于井下工具串的湿接头，其特征在于，所述绝缘活塞件与公接头抵接端设置有定位凹槽，所述定位凹槽与所述公接头同轴。
  8. 根据权利要求1至6任一项所述的一种用于井下工具串的湿接头，其特征在于，所述导电芯内腔的腔体上设置有多个通孔，所述通孔与所述第一腔体连通。
  9. 根据权利要求1至6任一项所述的一种用于井下工具串的湿接头，其特征在于，所述弹性部件为弹簧。
  10. 一种井下工具串，还包括与电缆连接的湿接头，其特征在于，所述湿接头为上述权利要求1至9任一项的湿接头。
PCT/CN2020/085592 2020-04-20 2020-04-20 一种用于井下工具串的湿接头及井下工具串 WO2021212264A1 (zh)

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