Fall prevention device for torsional impacter

Abstract

The invention relates to a fall prevention device for a torsional impacter, which is used for oil and gas drilling and can prevent the failed internal parts of the torsional impacter from falling to the bottom of a well to cause drilling accidents. The technical scheme is that: a shell is in clearance fit with a transmission shaft; the shell is provided with a shell groove; the transmission shaft is provided with a transmission shaft groove; the radial thickness of a fall prevention block is smaller than the depth of the transmission shaft groove; the fall prevention block is compressed in the transmission shaft groove; when the transmission shaft groove moves to the shell groove to form a cavity, a spring is released and the fall prevention block is pushed to the shell groove and tightly attached to the wall surface of the shell groove; and a threaded pin is arranged in a threaded hole formed on the shell. The grooves are respectively formed at a centering position of the transmission shaft and the shell, so that the length and external diameter of a tool cannot be increased, and the shell has high strength; meanwhile, drilling fluid can be prevented from entering the torsional impacter from the fall prevention device; the spring is compressed and released so as to realize assembly and disassembly; and the fall prevention device has a simple structure and high safety factor and is used for an underground drilling tool.

Description

technical field [0001] The invention relates to a lower anti-falling device of a torsional impactor of a downhole power tool used for oil and gas drilling. Background technique [0002] In the process of oil and gas extraction, downhole power tools have become an essential part to increase the rate of penetration. The torsional impactor can generate high-frequency torsional impact by converting fluid energy. It is used as a downhole tool directly connected to the drill bit. , to withstand drilling pressure and torque, and to withstand the vibration generated by the torsional impactor itself, it is necessary to install a safe and reliable anti-falling device at the bottom of the torsional impactor. The transmission shaft of the torsional impactor has and can only rotate slightly relative to the shell, which puts forward high requirements for the anti-dropping device under the torsional impactor. The anti-dropping device for the setting pin of the traditional downhole tool is ...

AI Technical Summary

Problems solved by technology

The transmission shaft of the torsional impactor has and can only rotate slightly relative to the shell, which puts forward high requirements for the anti-dropping device under the torsional impactor. The anti-dropping device for the setting pin of the traditional downhole tool is provided with a through hole on the shell , the force that the pin can withstand in this device is small, the safety factor of the pin and the shell is low, and it is easy to cause downhole accidents

It is time-consuming and labor-intensive to fish the fallen fish, which affects the progress of drilling and production operations and increases drilling costs

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