Backward-flowing prevention air hammer drill for foam drilling

Abstract

The invention provides a backward-flowing prevention air hammer drill for foam drilling. The backward-flowing prevention air hammer drill is characterized by comprising a tapered check valve, wherein the tapered check valve is arranged on the upper part of a center hole of the backward-flowing prevention air hammer drill and at the lower end of a tail pipe of the drill, and comprises a valve element body and a valve plug; the valve element body comprises a valve element and a pipe plug; the valve plug is in interference fit with the center hole of the backward-flowing prevention air hammer drill; the valve element is in clearance fit with the center hole of the drill; the valve element and the pipe plug form the valve element body with a hollow inner part; the valve element body can float up and down along a vertical direction between an upper dead center and a lower dead center; the upper dead center is the highest point for the upward floating of the valve element body along the vertical direction; and the lower dead center is the lowest point for the downward floating of the valve element body along the vertical direction.

Description

technical field [0001] The invention relates to the field of oil and gas well drilling, in particular to an anti-backflow air hammer drill bit suitable for foam drilling. Background technique [0002] Foam air hammer drilling technology is a drilling method in which foam is used as the power medium to drive the air hammer to work. It organically combines air hammer drilling technology and foam drilling technology, which not only exerts the characteristics of high efficiency of air hammer in breaking hard rock and is not easy to deviate, but also fully embodies the strong rock-carrying ability of foam as a well washing medium, stable well wall, and meets the requirements of wet conditions. The characteristics of rock-carrying requirements of formations and aquifers. [0003] The application of air hammer drilling technology in oilfield gas drilling can be said to be the application of its technology in deeper fields. (up to 300m 3 / min), high-frequency impact resistance, h...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that formation water and cuttings flow back into the air hammer when the conventional air hammer is used in the field of foam drilling, causing sand sticking of the air hammer and affecting normal drilling, and even the problem that the air hammer is stuck and does not work, the invention provides An anti-backflow air hammer drill bit for foam drilling

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