An anti-wear insulating pup joint for electromagnetic wave measurement while drilling

Abstract

The invention relates to an anti-wear insulation pipe nipple for electromagnetic wave measurement while drilling. The structures of the anti-wear insulation pipe nipple are as follows: a pipe nipple body is taken as a center, and two ends of the pipe nipple body are symmetrically connected to a protection joint and an anti-wear joint through a screw thread in sequence; insulation tapes with the equal width and protection tapes with the equal width and height are uniformly distributed at the middle section of the outer surface of the pipe nipple body at intervals, flexible ceramic is sprayed on the lateral end face of a position, which is located at a junction with the screw thread, in the pipe nipple body, the inner surface of a through hole at the center and the surface of the screw thread; the insulation tapes take the flexible ceramic and glass steel cloth as insulation layers, hard alloy teeth are embedded in the surfaces of the protection tapes, and the outer diameter of the hard alloy teeth is greater than the outer diameter of the insulation tapes; the protection joint and the insulation tapes of the pipe nipple body have the same outer diameter; the outer diameter of the surface of the anti-wear joint is greater than that of the protection tapes, the anti-wear joint is a small spiral centralizer, and the outer diameter of the surface of the anti-wear joint is smaller than that of the surface of the regular spiral centralizer. According to the structure, direct collision or friction of the pipe nipple body and a well wall can be reduced, and the repair of the insulation layers is simpler. The anti-wear insulation pipe nipple for electromagnetic wave measurement while drilling has the advantages of long service life and capability of reducing well drilling cost.

Description

technical field [0001] The invention relates to an anti-wear insulating short joint for electromagnetic wave measurement while drilling. Background technique [0002] Electromagnetic wave measurement while drilling (EM-MWD) is a new drilling technology, which has the advantages of high signal transmission speed, data transmission without circulating drilling fluid, short measurement time and low cost. The insulating sub is an important part of the electromagnetic wave measurement while drilling system. The insulating sub is connected to the drill string. Its main function is to divide the drill string into two non-conductive sections, so that the electromagnetic signal mainly passes through the formation. detected by ground receivers. [0003] Foreign countries have been relatively successful in the development of insulating pup joints. The main body of the insulating pup joints they developed are all made of insulating materials. They have been used in actual drilling oper...

AI Technical Summary

Problems solved by technology

However, the insulation material has strong adhesion, and it is also a time-consuming and labor-intensive task to completely remove it.

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