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Closed air circulation through type mud protection wall bundling down-the-hole hammer for hole expansion and method

The technology of mud wall protection and down-the-hole hammer is applied in drilling equipment and methods, earthwork drilling, driving device for drilling in wellbore, etc. It is beneficial to the upward return, reducing the amount of compressed air and improving the stability of the hole wall

Active Publication Date: 2019-12-20
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects and deficiencies in the prior art, the present invention provides a gas-closed circulation through-type mud retaining wall cluster-type down-the-hole hammer and method for reaming, which overcomes the inability of the prior art to solve deep hole construction, water gushing in the hole, and hole wall failure. Defects that bring about a series of problems

Method used

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  • Closed air circulation through type mud protection wall bundling down-the-hole hammer for hole expansion and method
  • Closed air circulation through type mud protection wall bundling down-the-hole hammer for hole expansion and method
  • Closed air circulation through type mud protection wall bundling down-the-hole hammer for hole expansion and method

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Embodiment 1

[0061] Such as Figure 1 to Figure 12 As shown, this embodiment provides an air-tight circulation through-type mud protection wall cluster type down-the-hole hammer for reaming, which includes an inner tube 1, an intermediate tube 2 and an outer tube 3 that are sequentially sleeved from the inside to the outside; and the inner tube 1, The lower ends of the middle pipe 2 and the outer pipe 3 are connected to the coaxial guide joint 4; it also includes a plurality of slag guide bends 5 arranged along the circumference of the outer pipe 3, and one end of the slag guide bend 5 passes through the outer pipe 3 and the middle pipe 2 And it is sealed and communicated with the inner pipe 1, and the other end is connected with the slag guide joint 6 parallel to the outer pipe 3; The slag outer pipe 6-1 and the intermediate pipe 2 are sealed and communicated through the air guide pipe 7; a gas distribution chamber 8 that is closely connected to the outer pipe 3 and connected with the out...

Embodiment 2

[0071] This embodiment also provides a construction method of closed-air circulation through-type mud retaining cluster type down-the-hole hammer for hole expansion, which includes the following steps:

[0072] a. Construction preparation steps, it is necessary to prepare the air compressor with the air volume required to drive the through-type down-the-hole hammer, the mud pump for driving the mud circulation and the supporting orifice sealing device, and it is also necessary to dig the mud pool and plan the ground in advance pipeline arrangement;

[0073] b. Drilling tool installation step, connect the outer pipe, middle pipe, and inner pipe to form a coaxial three-channel structure, including the inner pipe as the first slag return channel, the middle pipe and the inner pipe to form the first exhaust channel, and the outer pipe The first air intake passage is formed between the middle pipe, the air distribution chamber is connected to the outer pipe and communicated with th...

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Abstract

The invention discloses a closed air circulation through type mud protection wall bundling down-the-hole hammer for hole expansion and a method. The hammer comprises a coaxial three-channel structuresleeved by an outer pipe, a middle pipe and an inner pipe in sequence; the inner pipe is a first slag discharge channel; a first exhaust channel is formed between the inner pipe and the middle pipe; afirst intake channel is formed between the middle pipe and the outer pipe; the outer pipe is connected with an air distribution chamber; multiple through type down-the-hole hammers are arranged between the air distribution chamber and a fixed disc; compressed air enters the air distribution chamber through the first intake channel to drive the down-the-hole hammers to work; waste gas is fed in the first exhaust channel through a gas guide pipe; mud is injected from a hole annulus to carry with hole bottom rock chips to upwards return to the ground surface along through type down-the-hole hammer center channels, a slag guide bent pipe and a first slag discharge channel; in the process, the compressed air is circulated in a closed mode only for driving the down-the-hole hammers to work without being limited by water burst in holes and deep holes; meanwhile, the slag discharge through reverse circulation of the mud is realized; the hole wall stabilization, the drill bit cooling and the environment protection are facilitated; and the stratum adaptability is high.

Description

technical field [0001] The invention belongs to the technical field of drilling equipment, and in particular relates to an air-tight circulation through type mud retaining wall cluster type down-the-hole hammer for hole expansion and a method thereof. Background technique [0002] With the continuous development of oil and gas resources exploration and development, large-scale building bridge pile foundation drilling construction, geothermal drilling, mine rescue wells and other fields, drilling projects are gradually transitioning to medium and large diameters. When using conventional drilling methods to drill hard rock formations, drilling The efficiency and life of drilling tools are significantly reduced, and the construction cost and drilling cycle are significantly increased, which has become a technical problem recognized by domestic scholars and experts. [0003] Pneumatic down-the-hole hammer, as one of the main tools for high-efficiency rock breaking, has been well...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/28E21B4/14
CPCE21B4/14E21B7/28
Inventor 杨冬冬李泉新赵江鹏王四一赵建国刘建林
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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