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Side suction type reverse circulation drilling bit

A reverse circulation and side suction technology, applied in the direction of drill bits, drilling equipment, earth square drilling and mining, etc., can solve the problem of loss of ore samples

Inactive Publication Date: 2011-01-26
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art and provide a method to solve the problems of shrinkage, drill pinching and loss of some ore samples caused by part of the gas carrying small particles of cuttings and rock powder escaping from the annular gap outside the borehole. side suction reverse circulation drill bit

Method used

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  • Side suction type reverse circulation drilling bit
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Embodiment Construction

[0011] Below in conjunction with accompanying drawing and embodiment the present invention will be described in further detail:

[0012] The reverse circulation drill bit 3 is provided with a drill ejection nozzle 2, a gas mixing nozzle 5 and a drill bit side suction port 4, and the ejection nozzle 2, the gas mixing nozzle 5 and the drill bit side suction port 4 communicate with the drill bit bottom and the drill bit center channel 1.

[0013] During the normal impact drilling of the down-the-hole hammer, a part of the exhaust gas after the impact of the driving piston enters the reverse circulation drill bit ejection nozzle 2, and the high-speed gas is directly injected into the bit gas mixing nozzle 5. According to the ejection principle, during this process, due to the high-speed The entrainment effect of the fluid will entrain the waste gas and rock dust returned from the annular gap between the drill bit and the hole wall into the gas mixing nozzle 5 of the drill bit from ...

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Abstract

The invention relates to an oil-gas well hard rock drilling tool and a drilling and tunneling tool, in particular to a through-type pneumatic down-the-hole hammer side suction type reverse circulation drill bit. The reverse circulation drill bit is provided with a drill bit injection spray nozzle, a gas mixing spray nozzle and a drill bit side suction mouth; the injection spray nozzle, the gas mixing spray nozzle and the drill bit side suction mouth are communicated with the bottom and the central channel of the drill bit. According to the injection principle, because of the entrainment of high-speed fluid, the waste gas and the rock powder returning to the circular spacing between the drill bit and the hole wall is entrained from the side suction mouth to the gas mixing spray nozzle of the drill bit, and is mixed with the high-speed air flow from the drill bit injection spray nozzle in the gas mixing spray nozzle, to form the mixed jet fluid. The invention improves the through-type down-the-hole hammer reverse circulation forming capability, and solves the problems of hole shrinkage, sticking and the loss of partial ore samples caused by escaping of partial gas with small particles of rock debris and rock powder from the circular spacing of a drill hole.

Description

technical field [0001] The invention relates to a hard rock drilling and other drilling equipment for oil and gas wells, in particular to a through-type pneumatic down-the-hole hammer side-suction reverse circulation drill bit. Background technique [0002] The reverse circulation continuous coring technology of through-type down-the-hole hammer is an advanced drilling technology. Its working principle is: compressed air enters the down-the-hole hammer through the outer ring channel of the double-wall drill pipe to drive the piston to do work, and the exhaust gas after the work passes through the reverse circulation drill bit of the multi-nozzle principle to generate a negative pressure area at the bottom of the hole, forming a full hole reverse circulation . Due to the high rate of core recovery, full-hole reverse circulation and little disturbance to the formation, this process has great advantages in solving drilling problems in complex formations. In recent years, test...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/60
Inventor 彭枧明殷琨刘建林博坤范黎明殷其雷张永光
Owner JILIN UNIV
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