Flexible connection device of logging-while-drilling instrument

Abstract

The invention relates to a flexible connection device of a logging-while-drilling instrument. The flexible connection device consists of a cable fixing box, a cable, a limiting sleeve, a fixed block, a flexible telescopic rod, a centralizing joint, a flexible connector shell and a quick plug, wherein the centralizing joint is positioned in a central hole of a drilling rod, and the outer diameter of the centralizing joint is matched with that of the central hole of the drilling rod; the flexible connector shell is positioned in the central hole of the drilling rod, and the lower end is fixed on the centralizing joint; the cable fixing box is positioned at the inner upper end of the flexible connector shell; a pressing plate is arranged on the cable fixing box; the upper end of the cable is fixed by using the pressing plate; the limiting sleeve is positioned inside the flexible connector shell and outside the central hole of the centralizing joint and connected with an upper end face of the fixed block; a lower end face of the fixed block is connected with the flexible telescopic rod; the flexible telescopic rod passes through the central hole of the centralizing joint and is connected with the quick plug; and the lower end of the cable passes through the limiting sleeve, the fixed block and the central hole of the flexible telescopic rod and is connected with the quick plug. By adoption of the flexible connection device, data transmission and up-down power supplying can be realized. With near-term well-site actual operation, the flexible connection device is extremely low in fault rate and good in effect.

Description

technical field [0001] The invention relates to a flexible connection device of a logging-while-drilling instrument. Background technique [0002] In the new LWD system, since there are many parameter nipples (parameter nipples are drill pipes with instruments installed in the central hole), the connection device of the LWD tool is to connect the parameter nipples together to transmit data. And power supply, so the connection device of the tool while drilling is an important part of the whole system that cannot be ignored. Due to the very harsh working environment downhole, high temperature and high pressure, the operation of the well platform is also very complicated, and there are many unforeseen problems, all of which require the connection device of the drilling tool to have connection reliability, simplicity, and good man-machine operation process. However, the existing connection devices have problems such as overly complex structure, high cost, inconvenient on-site o...

AI Technical Summary

Problems solved by technology

[0004] This design can change the length, and has good adaptability to drill pipes of different lengths, and can compensate the axial error of the butt drill pipe. Since the shell of the rigid telescopic rod is made of rigid material and cannot be bent, it cannot compensate the transverse direction of the butt drill pipe. Swaying, it is not easy to dock at the well site, the sealing plug is not easy to plug in, the operation time is long, and the rigid telescopic rod is easy to be damaged

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