Fully-sealed intelligent over-the-line drill pipe joint

Abstract

A fully sealed intelligent wired drill pipe tool joint. A male tool joint (1) and a female tool joint (2) are sealingly screwed together by means of a first screw thread pair (3) and a second screw thread pair (4). A contact ring (5) for sealing and insulating the male tool joint is provided on an outer wall of the male tool joint and between the first screw thread pair and the second screw thread pair, a metal contact member (6) of the male tool joint is embedded in an outer wall of the contact ring (5) for sealing and insulating the male tool joint, a wire hole (1a) of the male tool joint is provided in the male tool joint, and a pre-embedded wire (7) of the male tool joint is pre-embedded in the contact ring for sealing and insulating the male tool joint. A contact ring (8) for sealing and insulating the female tool joint is provided on an inner wall of the female tool joint, a metal contact member (9) of the female tool joint is embedded in an inner wall of the contact ring for sealing and insulating the female tool joint, a wire hole (2a) of the female tool joint is provided in the female tool joint, and a pre-embedded wire (10) of the female tool joint is pre-embedded in the contact ring for sealing and insulating the female tool joint. The metal contact member of the male tool joint tightly abuts the metal contact member of the female tool joint. The tool joints have a simple structure and low cost, and effectively solves the problems of seal, insulation, and high vibration while ensuring transmission of power, signals, and torque.

Description

technical field [0001] The invention relates to a sealed over-the-line drill pipe joint capable of transmitting electrical signals and communication signals in the drill pipe, and can be widely used in intelligent over-the-line drill pipes, tool joints while drilling and other application occasions with the same requirements. Background technique [0002] From the late 1980s to the early 1990s, the drilling technology has put forward the need to solve the requirement of real-time two-way high-speed transmission of measurement and control data while drilling, and at the same time, the requirement of power transmission downhole while drilling. So began to study smart drill pipe. The main reasons are as follows: 1. The wireless pulse transmission capability is too low, and the intelligent drill pipe can increase the transmission capability by tens of thousands of times; 2. Electric energy is needed underground, and the power supply capacity of batteries and / or underground turbi...

AI Technical Summary

Problems solved by technology

All components required for electrical connection are installed at the end, which hardly reduces the inner diameter of the joint; one disadvantage is that the metal surface seal of the extended end is easily damaged, which will greatly affect the surface sealing effect; second, because the conductive ring is on the end In the first part, when the drill pipe is bent, the displacement between the conductive ring and the sealing surface is large, which will greatly affect the surface sealing effect; third, in a strong vibration environment, the displacement between the sealing surfaces at the end will also increase, which will also affect the surface sealing effect. Its sealing effect

[0005] (2) Schlumberger (patent number: WO 2009 / 133474 A2) adopts a wet joint installed at the inner diameter of the drill pipe joint, and its joint occupies a large amount of space in the inner diameter of the drill pipe, which greatly reduces the circulation area of ​​the drilling fluid ; In addition, the wet joint and the drill pipe joint body are two-body structure, so the anti-vibration performance is not good

[0006] (3), Southwest Petroleum University's intelligent drill pipe compensation type electrical joint (patent application number: 200710049485.3), adopts the same end lengthening method as GRANT Company, and its improvement is that the insulator at the end is changed to an insulating elastomer, which can be conductive The ring interface provides the initial compressive force, but several disadvantages of the end-lengthening method persist in this design

[0007] According to the above analysis, the current design can not fully meet the application requirements, it is necessary to design a new structure, so that the electric contact intelligent drilling can be developed

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