WO2017121087A1 - 全密封智能过线钻杆接头 - Google Patents

全密封智能过线钻杆接头 Download PDF

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WO2017121087A1
WO2017121087A1 PCT/CN2016/090232 CN2016090232W WO2017121087A1 WO 2017121087 A1 WO2017121087 A1 WO 2017121087A1 CN 2016090232 W CN2016090232 W CN 2016090232W WO 2017121087 A1 WO2017121087 A1 WO 2017121087A1
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WIPO (PCT)
Prior art keywords
male
joint
sealing
female
contact ring
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PCT/CN2016/090232
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English (en)
French (fr)
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叶顶胜
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叶顶胜
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Publication of WO2017121087A1 publication Critical patent/WO2017121087A1/zh

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    • 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
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042—Threaded
    • 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
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042—Threaded
    • E21B17/0423—Threaded with plural threaded sections, e.g. with two-step threads
    • 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
    • E21B17/023—Arrangements for connecting cables or wirelines to downhole devices
    • 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
    • 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
    • E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
    • E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency

Definitions

  • the invention relates to a sealed over-line drill pipe joint capable of transmitting electrical signals and communication signals in a drill pipe, and can be widely applied to intelligent over-the-line drill pipe, drilling tool joints and other applications having the same requirements.
  • the over-line intelligent drill pipe can solve the two functions of power supply and communication at the same time. It is the key technology of intelligent drilling. It needs to solve the problem of sealing insulation, transmission torque and high vibration in the complex environment of high-voltage conductive mud. At present, there are mainly the following designs on the intelligent over-drill pipe joints, but these technical solutions fail to solve the above technical problems at the same time. The following is a brief introduction:
  • GRANT is lengthened at the end of the drill pipe (refer to SPE79886), and the conductive ring and insulator are installed on the extension part, and the end has a gas-tight metal metal surface seal (that is, the seal between the metal surface and the metal surface) a conventional metal metal seal on the shoulder, and a conductive ring is installed behind the metal metal surface seal of the long end of the male joint, when the male joint and the female joint are screwed together, The entire circuit is turned on.
  • a gas-tight metal metal surface seal that is, the seal between the metal surface and the metal surface
  • a conductive ring is installed behind the metal metal surface seal of the long end of the male joint, when the male joint and the female joint are screwed together, The entire circuit is turned on.
  • the intelligent drill pipe compensation type electric joint of Southwest Petroleum University adopts the same end lengthening method as GRANT, which is improved to the end insulator to the insulating elastomer, which can be electrically conductive.
  • the ring contact surface provides an initial compressive force, but several disadvantages of the end lengthening method remain in this design.
  • the current design can not fully meet the application requirements, it is necessary to design the new structure, so that the electric contact intelligent drilling is developed.
  • the invention aims to provide a fully sealed intelligent over-line drill pipe joint with simple structure and low cost, which solves the problem of sealing insulation and high vibration under the premise of ensuring electric power and signal transmission and transmitting torque.
  • a fully sealed intelligent wire drill pipe joint comprising a male joint and a female joint, the male joint and the female joint being axially spaced apart by a first thread pair and a second joint
  • the threaded pair is screwed and sealed
  • a male joint sealing insulating contact ring is fixed on the outer wall of the male joint, and the male joint sealing insulating contact ring is located between the first thread pair and the second thread pair, and the male joint is sealed.
  • a male connector metal contact body is embedded on the outer wall of the edge contact ring, a male connector wire hole is arranged in the male connector, and a male connector embedded wire is embedded in the male connector sealing and insulating contact ring for contacting the male connector metal
  • the body is connected with the wire in the wire hole of the male connector; a female connector sealing and insulating contact ring facing the male connector sealing and insulating contact ring is fixed on the inner wall of the female connector, and is embedded on the inner wall of the female connector sealing and insulating contact ring
  • the female connector metal contact body is provided with a female connector wire hole in the female connector, and the female connector pre-embedded wire is embedded in the female connector sealing and insulating contact ring for connecting the female connector metal contact body and the female connector wire hole The wires are connected, and the metal contact of the male connector is in close contact with the metal contact of the female connector.
  • the working principle of the invention when the male connector and the female connector are tightly screwed, the metal contact body of the male connector is in contact with the metal contact body of the female connector, and the current and communication signals can flow through the wires in the wire hole of the male connector and the embedded wire of the male connector. Connect to the metal contact body of the male connector, and then connect the wire to the lower drill pipe through the female connector metal contact body, the female connector embedded wire, and the female connector wire hole.
  • the sealing insulating contact ring is arranged in the center of the two thread pairs, and the first and second thread pairs distributed on both sides of the sealing insulating contact ring respectively act to reduce pressure, seal and transmit torque; The resultant force makes the middle contact ring tightly wrapped, which can effectively solve the high vibration problem.
  • the outer wall of the male seal insulating contact ring is provided with two sealing rings, and the two sealing rings are respectively located on the front and rear sides of the metal contact body of the male joint, and are disposed on the outer wall of the male joint.
  • a sealing ring for sealing the insulating contact ring of the male connector, and a sealing ring facing the female connector sealing the insulating contact ring is arranged on the inner wall of the female connector.
  • the sealing ring on the front and rear sides of the metal contact body of the male joint can discharge the mud on the inner wall of the female joint during the screwing process of the male and female joints, preventing the foreign matter from remaining and causing the insulation to fall; the outer wall of the male joint is facing the male joint Sealing the sealing ring of the insulating contact ring, the sealing ring of the insulating contact ring facing the female connector on the inner wall of the female connector can prevent The high-voltage conductive mud enters the wire holes of the male and female joints, which has the effect of double insurance, thus solving the electrical insulation problem more thoroughly.
  • the front end of the first pair of threads and the rear end of the second pair of threads are airtight metal metal face seals, and the mud is further sealed from the ends.
  • the first pair of threads and the second pair of threads are digitally threaded and sealed by a hermetic metal metal thread pair.
  • the digital thread has a taper and is sealed with a hermetic metal metal thread to seal better.
  • the male joint sealing and insulating contact ring is once pressed or sintered on the outer wall of the male joint or sleeved on the outer wall of the male joint by the high temperature insulating material, and the female joint sealing insulating contact ring is once pressed or sintered by the high temperature insulating material. It is sleeved on the inner wall of the female connector or after being formed on the inner wall of the female connector, which is convenient for processing and manufacturing.
  • the high-temperature insulating material used for the male joint sealing and insulating contact ring and the female joint sealing and insulating contact ring is PEEK or high-temperature ceramic, which is convenient for material selection and cost saving.
  • the male joint metal contact body and the female joint metal contact body adopt single-core contact or multi-core contact, and provide single-core or multi-core electrical connection for the joint, and are selected according to requirements to meet diversified demands.
  • the first thread pair and the second thread pair have the same length. According to the mechanical structure analysis, the length of the two pairs of threads is equal, which is different from the length of the two pairs of threads, and the ability to balance the force and transmit torque before and after is stronger.
  • the beneficial effects of the invention under the premise of ensuring the power and signal transmission of the intelligent drill pipe, the sealing and insulating contact ring of the male and female joints are protected by the thread pair on both sides by the way of the middle layout of the sealed insulating contact ring, which can effectively reduce the mud
  • the pressure exerted on the sealed insulating contact ring greatly improves the sealing insulation performance of the sealed insulating contact ring and achieves torque transmission; in addition, due to the two sides
  • the anti-vibration capability of the threaded pair and the male and female joints and the sealed insulating contact ring can be greatly improved.
  • the invention has the advantages of simple structure and low cost, and can be widely applied to intelligent over-drilling rods, as-drilling instrument joints and other applications having the same requirements.
  • Figure 1 is a schematic view of the structure of the present invention.
  • Figure 2 is a partial enlarged view of Figure 1.
  • Figure 3 is a cross-sectional view of the male connector and related parts.
  • Figure 4 is a cross-sectional view of the female connector and related parts.
  • a fully sealed intelligent over-wire drill pipe joint mainly consists of a male joint 1, a female joint 2, a male joint sealing insulating contact ring 5, a male joint metal contact body 6, a male joint embedded wire. 7.
  • the female joint seals the insulating contact ring 8, the female joint metal contact body 9, the female joint embedded wire 10, and the plurality of sealing rings 11.
  • Both the male connector 1 and the female connector 2 are metal members, and the male connector 1 and the female connector 2 are screwed and sealed by a first thread pair 3 and a second thread pair 4 which are axially spaced apart.
  • the first pair of threads 3 and the second pair of threads 4 are digitally threaded and sealed for a hermetic metal metal thread pair.
  • the front end of the first thread pair 3 and the rear end of the second thread pair 4 are airtight metal metal face seals.
  • a male joint sealing insulating contact ring 5 is fixed on the outer wall of the male joint 1, and the male joint sealing insulating contact ring 5 is located between the first thread pair 3 and the second thread pair 4, and the insulating joint contact ring 5 is sealed at the male joint.
  • a male connector metal contact body 6 is fitted to the outer wall, and a male connector wire hole 1a is provided in the male connector 1.
  • a male connector embedded wire 7 is embedded in the male sealing and insulating contact ring 5 for public connection The head metal contact body 6 is connected to a wire in the lead wire hole 1a of the male connector.
  • a female joint sealing insulating contact ring 8 facing the male joint sealing insulating contact ring 5 is fixed to the inner wall of the female joint 2, and a female joint metal contact body 9 is fitted on the inner wall of the female joint sealing insulating contact ring 8.
  • a female connector wire hole 2a is disposed in the female connector 2, and a female connector embedded wire 10 is embedded in the female connector sealing insulating contact ring 8 for guiding the female connector metal contact body 9 and the female connector wire hole 2a The connection is made, and the male metal contact body 6 is in close contact with the female metal contact body 9.
  • the male joint sealing insulating contact ring 5 is pressed or sintered at a time on the outer wall of the male joint 1 or after being formed on the outer wall of the male joint by a high temperature insulating material; likewise, the female joint sealing insulating contact ring 8 is used at a high temperature.
  • the insulating material is pressed or sintered at one time on the inner wall of the female joint 2 or after being formed and sleeved on the inner wall of the female joint.
  • the high-temperature insulating material used for the male joint sealing insulating contact ring 5 and the female joint sealing insulating contact ring 8 is PEEK or high-temperature ceramic; the male joint metal contact body 6 and the female joint metal contact body 9 adopt single-core contact or multi-core contact, Provide single or multi-core electrical connections to the connector.
  • Two sealing rings 11 are disposed on the outer wall of the male joint sealing insulating contact ring 5, and the two sealing rings 11 are respectively located on the front and rear sides of the male metal contact body 6.
  • a sealing ring 11 is disposed on the outer wall of the male connector 1 to seal the insulating contact ring 5 with the male connector, so as to prevent the high-voltage conductive mud from entering the male connector wire hole 1a; similarly, a positive electrode is disposed on the inner wall of the female connector 2.
  • the sealing ring 11 of the insulating contact ring 8 is sealed to the female connector to prevent the high-voltage conductive mud from entering the female wire hole 2a.
  • a seal ring 11 may be provided on the second thread pair 4, and a seal ring (not shown) may be provided on the first thread pair 3.
  • the lengths of the first thread pair 3 and the second thread pair 4 are equal, and of course, unequal forms are also possible. In the specific implementation, it should be ensured that the overall length of the first thread pair 3 and the second thread pair 4 is equivalent to the length of the integrated thread, ensuring that the torque transmitting capability is equivalent to that of the integrated thread.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
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Abstract

一种全密封智能过线钻杆接头，公接头（1）与母接头（2）通过第一螺纹对（3）、第二螺纹对（4）旋合密封，在公接头的外壁上设有公接头密封绝缘接触环（5），位于第一螺纹对与第二螺纹对之间，在公接头密封绝缘接触环的外壁上嵌装有公接头金属接触体（6），在公接头内设置有公接头导线孔（1a），在公接头密封绝缘接触环内预埋有公接头预埋导线（7）；在母接头的内壁上设有母接头密封绝缘接触环（8），在母接头密封绝缘接触环的内壁上嵌装有母接头金属接触体（9），在母接头内设置有母接头导线孔（2a），在母接头密封绝缘接触环内预埋有母接头预埋导线（10），公接头金属接触体与母接头金属接触体紧密接触。该接头结构简单、成本低，在确保进行电力和信号传输、传递扭矩的前提下，有效解决密封绝缘和高振动问题。

Description

全密封智能过线钻杆接头
交叉引用
本申请主张2016年1月11日提交的中国专利申请号为201610014975.9的优先权，其全部内容通过引用包含于此。
技术领域
本发明涉及能在钻杆中传输电信号和通讯信号的密封过线钻杆接头，能广泛应用于智能过线钻杆、随钻仪器接头以及有同样需求的其他应用场合。
背景技术
从20世纪80年代末90年代初钻井技术上提出了需要解决既能随钻实时双向高速传输测控数据的需求，同时又能随钻往井下送电的要求。于是开始研究智能钻杆。其主要理由：一、无线脉冲传输能力太低，而智能钻杆能成千上万倍地提高传输能力；二、井下需电能，而用电池和/或井下涡轮发电机等方法的供电能力有限、费用高，特别是加长了MWD、LWD、旋转导向钻井工具等硬件的长度，难以满足近钻头测量的轴向距离。
过线式智能钻杆能同时解决供电和通讯两大功能，是智能化钻井的关键技术，需要在高压导电泥浆这种复杂环境中，同时解决密封绝缘、传输扭矩、高振动问题。目前，在智能过线钻杆接头上主要有以下几种设计，但这些技术方案都未能同时解决好上述技术问题，下面进行简单地介绍：
(1)、GRANT公司在钻杆端部进行加长(参考SPE79886)，并在加长部分安装导电环和绝缘体，端部具有气密的金属金属面密封(即金属面与金属面接触实现的密封)，台肩上有常规的金属金属密封，在公接头加长端部的金属金属面密封后面进行安装导电环，当公接头和母接头旋合在一起时， 整个电路导通。电气连接需要的所有组件都安装在端部，几乎不减少接头内径；其一缺点是加长端部的金属金属面密封容易受损，将极大影响面密封效果；其二，由于导电环在端部，在钻杆弯曲情况下导电环与密封面的位移较大，将极大影响面密封效果；其三，在强振动环境下，端部的密封面间位移也会增大，也将影响其密封效果。
(2)、斯伦贝谢(专利号：WO 2009/133474 A2)采用的是在钻杆接头内径处安装湿式接头，其接头占用了大量的钻杆内径空间，使钻井液流通面积大量减小；另外，其湿式接头与钻杆接头本体为两体结构，因此抗振性能不好。
(3)、西南石油大学的智能钻杆补偿式电接头(专利申请号：200710049485.3)，采用与GRANT公司相同的端部加长法，其改进为端部的绝缘体改为绝缘弹性体，可以为导电环接触面提供初始压缩力，但端部加长法的几个缺点在这个设计中依然存在。
根据以上分析，现在的设计都还不能完全满足应用需求，有必要进行新结构的设计，使电接触式智能钻井得到发展。
发明内容
本发明旨在提供一种结构简单、成本低的全密封智能过线钻杆接头，在确保进行电力和信号传输、传递扭矩的前提下，解决密封绝缘和高振动问题。
为此，本发明所采用的技术方案为：一种全密封智能过线钻杆接头，包括公接头和母接头，所述公接头与母接头通过轴向间隔设置的第一螺纹对、第二螺纹对旋合密封，在公接头的外壁上固设有公接头密封绝缘接触环，该公接头密封绝缘接触环位于第一螺纹对与第二螺纹对之间，在公接头密封绝 缘接触环的外壁上嵌装有公接头金属接触体，在公接头内设置有公接头导线孔，在公接头密封绝缘接触环内预埋有公接头预埋导线，用于将公接头金属接触体与公接头导线孔内的导线连接；在所述母接头的内壁上固设有正对公接头密封绝缘接触环的母接头密封绝缘接触环，在母接头密封绝缘接触环的内壁上嵌装有母接头金属接触体，在母接头内设置有母接头导线孔，在母接头密封绝缘接触环内预埋有母接头预埋导线，用于将母接头金属接触体与母接头导线孔内的导线连接，且公接头金属接触体与母接头金属接触体紧密接触。
本发明的工作原理：当公接头与母接头旋合紧密后，公接头金属接触体与母接头金属接触体接触，电流及通讯信号可以通过公接头导线孔内的导线、公接头预埋导线流入到公接头金属接触体，再通过母接头金属接触体、母接头预埋导线、母接头导线孔里导线连接到下一级钻杆。采用将密封绝缘接触环布置在两个螺纹对的中央，分布在密封绝缘接触环两侧的第一、第二螺纹对分别起到降压、密封、传输扭矩的作用；由于两端螺纹的扭合力使得中间的接触环被牢牢包裹，能有效解决高振动问题。
作为上述方案的优选，所述公接头密封绝缘接触环的外壁上设置有两个密封圈，且这两个密封圈分别位于公接头金属接触体的前后两侧，在公接头的外壁上设置有一个正对公接头密封绝缘接触环的密封圈，在母接头的内壁上设置有一个正对母接头密封绝缘接触环的密封圈。位于公接头金属接触体的前后两侧的密封圈，在公、母接头旋合过程中可将母接头内壁上的泥浆排出，防止异物残留导致绝缘性下降；公接头的外壁上正对公接头密封绝缘接触环的密封圈，母接头的内壁上正对母接头密封绝缘接触环的密封圈，可防 止高压导电泥浆进入公、母接头导线孔内，起到双保险的效果，如此更彻底地解决电气绝缘问题。
进一步，所述第一螺纹对的前端、第二螺纹对的后端为气密的金属金属面密封，更进一步地从端头对泥浆进行密封。
所述第一螺纹对、第二螺纹对采用数字型螺纹，并为气密的金属金属螺纹对密封。数字型螺纹带有锥度，结合气密的金属金属螺纹对密封，密封效果更好。
所述公接头密封绝缘接触环采用高温绝缘材料一次压制或烧结成型在公接头的外壁上或成型后套接在公接头的外壁上，母接头密封绝缘接触环采用高温绝缘材料一次压制或烧结成型在母接头的内壁上或成型后套接在母接头的内壁上，方便加工制造。
所述公接头密封绝缘接触环、母接头密封绝缘接触环采用的高温绝缘材料为PEEK或高温陶瓷，方便选材并节约成本。
所述公接头金属接触体、母接头金属接触体采用单芯接触或多芯接触，为接头提供单芯或多芯电气连通，根据需要选择，满足多元化需求。
所述第一螺纹对、第二螺纹对的长度相等。根据力学结构分析，采用两个螺纹对长度相等，比两个螺纹对长度不等，前后受力平衡性及传递扭矩的能力更强。
本发明的有益效果：在保证智能钻杆进行电力和信号传输的前提下，采用密封绝缘接触环中部布局的方式，使公、母接头密封绝缘接触环受到两边螺纹对的保护，可以有效减轻泥浆施加在密封绝缘接触环上的压力，巨大提高密封绝缘接触环的密封绝缘性能，并实现扭矩传输；另外，由于受到两边 螺纹对和公、母接头的挤压作用，密封绝缘接触环的抗振能力能得到巨大提高。本发明结构简单，成本低，能广泛应用于智能过线钻杆、随钻仪器接头以及有同样需求的其他应用场合。
附图说明
图1为本发明的结构示意图。
图2为图1的局部放大图。
图3为公接头及相关零件的剖视图。
图4为母接头及相关零件的剖视图。
具体实施方式
下面通过实施例并结合附图，对本发明作进一步说明：
结合图1—图4所示，一种全密封智能过线钻杆接头，主要由公接头1、母接头2、公接头密封绝缘接触环5、公接头金属接触体6、公接头预埋导线7、母接头密封绝缘接触环8、母接头金属接触体9、母接头预埋导线10、多个密封圈11组成。
公接头1与母接头2均为金属件，公接头1与母接头2通过轴向间隔设置的第一螺纹对3、第二螺纹对4旋合密封。最好是，第一螺纹对3、第二螺纹对4采用数字型螺纹，并为气密的金属金属螺纹对密封。另外，第一螺纹对3的前端、第二螺纹对4的后端为气密的金属金属面密封。
在公接头1的外壁上固设有公接头密封绝缘接触环5，该公接头密封绝缘接触环5位于第一螺纹对3与第二螺纹对4之间，在公接头密封绝缘接触环5的外壁上嵌装有公接头金属接触体6，在公接头1内设置有公接头导线孔1a。在公接头密封绝缘接触环5内预埋有公接头预埋导线7，用于将公接 头金属接触体6与公接头导线孔1a内的导线连接。
在母接头2的内壁上固设有正对公接头密封绝缘接触环5的母接头密封绝缘接触环8，在母接头密封绝缘接触环8的内壁上嵌装有母接头金属接触体9。在母接头2内设置有母接头导线孔2a，在母接头密封绝缘接触环8内预埋有母接头预埋导线10，用于将母接头金属接触体9与母接头导线孔2a内的导线连接，且公接头金属接触体6与母接头金属接触体9紧密接触。
最好是，公接头密封绝缘接触环5采用高温绝缘材料一次压制或烧结成型在公接头1的外壁上或成型后套接在公接头的外壁上；同样，母接头密封绝缘接触环8采用高温绝缘材料一次压制或烧结成型在母接头2的内壁上或成型后套接在母接头的内壁上。另外，公接头密封绝缘接触环5、母接头密封绝缘接触环8采用的高温绝缘材料为PEEK或高温陶瓷；公接头金属接触体6、母接头金属接触体9采用单芯接触或多芯接触，为接头提供单芯或多芯电气连通。
公接头密封绝缘接触环5的外壁上设置有两个密封圈11，这两个密封圈11分别位于公接头金属接触体6的前后两侧。在公接头1的外壁上设置有一个正对公接头密封绝缘接触环5的密封圈11，防止高压导电泥浆进入公接头导线孔1a内；同理，在母接头2的内壁上设置有一个正对母接头密封绝缘接触环8的密封圈11，防止高压导电泥浆进入母接头导线孔2a内。进一步，还可以在第二螺纹对4上设置有一个密封圈11，以及在第一螺纹对3上设置有一个密封圈(图中未示出)。当公接头1与母接头2逐步旋紧时，公接头密封绝缘接触环的密封圈11逐步经过密封面，将密封面上的剩余泥浆排除干净。
最好是，第一螺纹对3、第二螺纹对4的长度相等，当然也可以采用不等的形式。在具体实施时，应保证第一螺纹对3、第二螺纹对4的总体长度与一体化螺纹的长度相当，确保传递扭矩能力与一体化螺纹的结构相当。

Claims (8)

  1. 一种全密封智能过线钻杆接头，包括公接头(1)和母接头(2)，其特征在于：所述公接头(1)与母接头(2)通过轴向间隔设置的第一螺纹对(3)、第二螺纹对(4)旋合密封，在公接头(1)的外壁上固设有公接头密封绝缘接触环(5)，该公接头密封绝缘接触环(5)位于第一螺纹对(3)与第二螺纹对(4)之间，在公接头密封绝缘接触环(5)的外壁上嵌装有公接头金属接触体(6)，在公接头(1)内设置有公接头导线孔(1a)，在公接头密封绝缘接触环(5)内预埋有公接头预埋导线(7)，用于将公接头金属接触体(6)与公接头导线孔(1a)内的导线连接；在所述母接头(2)的内壁上固设有正对公接头密封绝缘接触环(5)的母接头密封绝缘接触环(8)，在母接头密封绝缘接触环(8)的内壁上嵌装有母接头金属接触体(9)，在母接头(2)内设置有母接头导线孔(2a)，在母接头密封绝缘接触环(8)内预埋有母接头预埋导线(10)，用于将母接头金属接触体(9)与母接头导线孔(2a)内的导线连接，且公接头金属接触体(6)与母接头金属接触体(9)紧密接触。
  2. 根据权利要求1所述的全密封智能过线钻杆接头，其特征在于：所述公接头密封绝缘接触环(5)的外壁上设置有两个密封圈(11)，且这两个密封圈(11)分别位于公接头金属接触体(6)的前后两侧，在公接头(1)的外壁上设置有一个正对公接头密封绝缘接触环(5)的密封圈(11)，在母接头(2)的内壁上设置有一个正对母接头密封绝缘接触环(8)的密封圈(11)。
  3. 根据权利要求1或2所述的全密封智能过线钻杆接头，其特征在于：所述第一螺纹对(3)的前端、第二螺纹对(4)的后端为气密的金属金属面密封。
  4. 根据权利要求3所述的全密封智能过线钻杆接头，其特征在于：所述第一螺纹对(3)、第二螺纹对(4)采用数字型螺纹，并为气密的金属金属螺纹对密封。
  5. 根据权利要求1所述的全密封智能过线钻杆接头，其特征在于：所述公接头密封绝缘接触环(5)采用高温绝缘材料一次压制或烧结成型在公接头(1)的外壁上或成型后套接在公接头(1)的外壁上，母接头密封绝缘接触环(8)采用高温绝缘材料一次压制或烧结成型在母接头(2)的外壁上或成型后套接在母接头(2)的内壁上。
  6. 根据权利要求1所述的全密封智能过线钻杆接头，其特征在于：所述公接头密封绝缘接触环(5)、母接头密封绝缘接触环(8)采用的高温绝缘材料为PEEK或高温陶瓷。
  7. 根据权利要求1所述的全密封智能过线钻杆接头，其特征在于：所述公接头金属接触体(6)、母接头金属接触体(9)采用单芯接触或多芯接触，为接头提供单芯或多芯电气连通。
  8. 根据权利要求1所述的全密封智能过线钻杆接头，其特征在于：所述第一螺纹对(3)、第二螺纹对(4)的长度相等。
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