Dual-controlling-channel impulse jet ball-tooth bit

A pulse jet and dual control technology, which is applied in the direction of drill bit, drilling equipment, earthwork drilling, etc., can solve the problems of poor cuttings removal effect, repeated crushing, and decreased drilling efficiency, so as to enhance the cuttings removal effect and increase the impact frequency , Improve the effect of easy accumulation
CN107795282AActive Publication Date: 2018-03-13CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2018-03-13

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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.
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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...

Claims

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