Dual-controlling-channel impulse jet ball-tooth bit

Abstract

The invention relates to a dual-controlling-channel impulse jet ball-tooth bit including a pressing head, a dual-controlling-channel monostable jet element, a bit body and an inner channel. The dual-controlling-channel monostable jet element, the upper pressing head and the peripheral bit body are welded to form a whole. One big and one small controlling channels and one big and one small fluid exits are formed in a dual-controlling-channel bistable jet element and connected with big and small nozzles of the bit correspondingly. During the process of collision and separation between a ram andthe bit, one of the dual controlling channels is periodically opened and closed in the process, impulse jet is created by the high frequency switching of fluids inside the jet element, and the cleaning effect of the bottom of nozzle holes is intensified. Sharp pressure increase produced by the bit collision not only does not bring negative influence to the ram impacting process, but also facilitates ram return starting, shock frequency is increased to some degree, and rock breaking efficiency is increased.

Description

technical field [0001] The invention relates to a drilling tool, in particular to a double control channel pulse jet button drill bit. Background technique [0002] Rapid drilling of deep and ultra-deep wells in hard rock formations has always been a research hotspot, and it is also a development direction in the future. The holding effect caused by the large hydrostatic column pressure in deep wells often makes it difficult to remove the cuttings at the bottom of the hole. Especially for down-the-hole hammer drilling technology. In order to ensure that the impact energy of the hammer can be transmitted to the bottom of the well, the pressure at the entrance of the button bit of the down-the-hole hammer is usually small to avoid the adverse effect of the fluid back pressure on the impact movement of the hammer. The low nozzle inlet pressure combined with the leakage in the spline fitting part of the drill bit makes the fluid ejected from the nozzle of the DTH button bit le...

AI Technical Summary

Problems solved by technology

Low nozzle inlet pressure combined with leakage from the spline fit of the drill bit makes the fluid sprayed by the DTH button bit nozzle less effective in removing cuttings

In addition, the rotation speed of DTH hammer drilling is much lower than that of conventional rotary drilling technology, which results in a relatively fixed nozzle position covering a small area at the bottom of the hole in the same time, which intensifies the lack of power of the flushing medium at the bottom of the hole and causes rock formation. Chips accumulate, which in turn causes a series of problems such as repeated crushing, excessive local temperature, and increased wear of the drill bit, which ultimately manifests as a decrease in drilling efficiency and an increase in cost

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