Insulation method for conductive liquid medium in short section electrical connection of instrument while drilling

Abstract

The invention discloses an insulating method of a conductive liquid medium in electric connection of drilling instrument nipples. Electric insulation of the inner walls of elongated axial conductive liquid channels in an electric connection device is relatively difficult. The method comprises the steps as follows: three radial holes are formed in side walls of axial holes of a connector body; meltable polytetrafluoroethylene injected into each axial hole is provided with one axial conductive liquid channel after being solidified; a liquid injection hole, an upper liquid outlet hole and a lower liquid outlet hole formed in the side wall of each axial conductive liquid channel are coaxial with the three radial holes respectively; the outer surface of the connector body is sprayed with an insulating ceramic coating; the inner surfaces of an upper pressure-resistant cylinder and a lower pressure-resistant cylinder are sprayed with insulating ceramic coatings and then are in threaded connection with the connector body; the bottom parts of annular grooves of the upper pressure-resistant cylinder and the lower pressure-resistant cylinder communicate with corresponding electric connecting lines through corresponding electric connecting piece installation holes and the top parts communicate with the corresponding upper liquid outlet holes and lower liquid outlet holes in the side walls of the axial conductive liquid channels respectively; and the electric connecting piece installation holes are in threaded connection with single-core electric connecting pieces. By the insulating method, the problem of electric insulation of the inner walls of the elongated axial conductive liquid channels in the electric connection device is solved.

Description

technical field [0001] The invention belongs to the technical field of electrical connection, and in particular relates to an insulating method for a conductive liquid medium in the electrical connection of a short section of an instrument while drilling. Background technique [0002] When making electrical connections between short sections of the tool while drilling, it is necessary to consider the rotation problem caused by the threaded connection. According to the literature consulted, at present, there are mainly two methods commonly used to solve the problem of rotating connection at home and abroad: one is to install a conductive ring on the joint of the short joint to realize it; the other is to use a pin-type connector. The connected external thread and the short joint are designed as a rotatable structure, which converts the rotary motion into a linear motion. In addition, in the patent CN204793531U, a "multi-circuit electrical connection device for sub-sections o...

AI Technical Summary

Problems solved by technology

However, the electrical insulation of the inner wall of the slender axial conductive liquid channel inside the electrical connection device is a relatively difficult problem.

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