Telescopic connector for logging-while-drilling instrument

Abstract

The invention discloses a telescopic connector for a logging-while-drilling instrument. The telescopic connector comprises a housing, an internal cylinder sleeved into the housing, a middle joint short section, a pressure balance short section, an upper oil-injection short section, a lower oil-injection short section, a telescopic short section and a rotary connector. The middle joint short section, the pressure balance short section, the upper oil-injection short section, the lower oil-injection short section, the telescopic short section and the rotary connector are sequentially connected from the top to the bottom. The telescopic connector for the logging-while-drilling instrument has following beneficial effects: the telescopic short section can be rigidly telescopic via a sliding rod so that stability is enhanced; length of the pressure balance short section and an oil-injection system can be changed by adjustments via compression springs and a floating piston and mud pressure is balanced; integral pressure-bearing capability and reliability of parts of the connector are significantly improved; a spring retractable cable runs through the interior of an enclosed cavity filled up with hydraulic oil in order to prevent from being contact with mud so that reliability of cable communication is ensured; the lower end of the sliding rod is provided with the rotary connector; when the rotary connector is connected with the LWD instrument, a sliding ring does not relatively rotate and the cable does not get twisted; due to the fact that spline fit is achieved between an anti-rotating plunger head at the upper end of the sliding rod and the internal cylinder, the sliding rod is prevented from rotating relative to the internal cylinder when being scoured by mud so that the cable does not get twisted.

Description

【Technical field】 [0001] The invention belongs to the technical field of petroleum drilling, and relates to logging-while-drilling equipment in petroleum drilling, in particular to a telescopic connector for drilling-while-drilling instruments. 【Background technique】 [0002] The while-drilling connector is a key component connecting MWD (measurement while drilling) and LWD (logging while drilling) tools in logging while drilling operations. It provides power supply and communication for MWD tools and LWD tools. The reliability of the connection unit has a direct impact on the logging-while-drilling system. [0003] During the operation while drilling, the current flexible connector is exposed to the cable in the mud of the drill collar water hole, and is subjected to loads such as torsion, bending, erosion and vibration, and is prone to failures such as insulation deterioration and cable breakage, resulting in The reliability of the whole LWD system is reduced, affecting t...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and to provide a telescopic connector for drilling instruments. Problems such as cable erosion, severe wear, and poor insulation have improved the reliability of LWD tool connections

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