Underground torsion impact stimulation device based on drill string vibration

Abstract

The invention relates to an underground torsion impact stimulation device based on drill string vibration. The device comprises an upper stress transmission assembly, a reset torsion transmission assembly and a torsion activation transmission assembly, wherein the upper stress transmission assembly comprises a vibration transmission shaft, a spacing ring, a driving torsion impact body and a driving torsion impact body compression block; the reset torsion transmission assembly comprises a spline outer barrel, a spring protection barrel, a spring, a spring lower plugging joint, a torsion transmission protection barrel and a spacing joint; the torsion activation transmission assembly comprises a driven torsion impact body and a conversion joint; the vibration transmission shaft and the driving torsion impact body compression block are in threaded connection; the driving torsion impact body is installed on the mounting surface of the driving torsion impact body of the vibration transmission shaft in a clearance fit way; the driven torsion impact body and the conversion joint are in threaded connection; the spring is arranged in the spring protection barrel. According to the device, conversion to circumferential high-frequency torsion impact vibration from axial vibration can be realized, and vibration frequency can be changed according to the number of inner torsion teeth so as to generate high-frequency torsion impact vibration which meets site requirements.

Description

technical field [0001] The invention belongs to the field of petroleum engineering, and in particular relates to a downhole torsional shock excitation device based on drill string vibration, which is used for converting the longitudinal vibration of the drill string into circumferential high-frequency torsional shock vibration of the drill bit in oil and natural gas drilling operations. Background technique [0002] Drilling field practice shows that applying circumferential high-frequency impact load to the PDC bit can improve the rock-breaking efficiency of the bit and speed up the drilling operation. For this reason, a variety of torsional impactors have been designed at home and abroad to achieve the purpose of applying circumferential high-frequency impact loads to the PDC bit, mainly including: the torsional impactor of the U.S. Atra Company, the torsional impact drilling tool of the Southwest Petroleum University (application number: 200910058083.9), Sinopec Shengli E...

AI Technical Summary

Problems solved by technology

In extremely deep wells, there is even a phenomenon that the circulating medium can only satisfy the circulation of carrying rock without other energy. In such wells, the working status of the above-mentioned devices will be greatly affected, and it is very likely that they will not work or even affect the drilling operation; Moreover, when the drilling circulation medium is a medium with a large compressibility such as air or aerated drilling fluid, it is difficult for the above-mentioned devices to work normally.

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