Cross gas distribution device for through type down-hole hammer

Abstract

The invention discloses a cross gas distribution device for a through type down-hole hammer. The cross gas distribution device comprises an upper joint body, a lower joint body and an inner pipe, wherein an annular space formed between the inner pipe and the lower joint body, a vertical through hole in the upper section of the lower joint body, an upper through hole in the upper joint body and an inner circular hole jointly form an air inlet channel; the air inlet channel is communicated with a high-pressure air inlet channel of the through type down-hole hammer; a central hole of the inner pipe and a transverse through hole in the upper section of the lower joint body jointly form an exhaust channel; the exhaust channel is communicated with a low-pressure exhaust channel of the through type down-hole hammer; the air inlet channel and the exhaust channel are mutually independent. The cross gas distribution device for the through type down-hole hammer, disclosed by the invention, is connected between a single-channel drilling rod and the through type down-hole hammer, so that the through type down-hole hammer not only can realize reverse circulation drilling, but also can realize directional circulation drilling or rotary impact compaction drilling in required occasions such as a soft surface layer of a complex formation, and the through type down-hole hammer is enabled to form a reverse blowing operation effect.

Description

technical field [0001] The invention relates to an auxiliary device for a through-type down-the-hole impactor, in particular to a cross gas distribution device for the through-type down-the-hole impactor. Background technique [0002] Drilling in complex formations often requires a combination of multiple drilling techniques, especially for formations where the surface layer is soil, the underlying layer is sandy pebbles mixed with boulders and boulders, and deep-seated rocks are strongly weathered or moderately weathered, such as China Most of the Sichuan Basin in Southwest China has the above geological characteristics. [0003] The rotary drilling tool composed of down-the-hole pneumatic hammer can be applied to the above-mentioned types of formations to obtain higher drilling efficiency, and the through-type down-the-hole hammer is especially suitable for the above-mentioned complex formations. [0004] However, due to the relatively loose surface soil and sand and pebb...

AI Technical Summary

Problems solved by technology

[0004] However, due to the relatively loose surface soil and sand and pebble layers, the through-type DTH impactor must follow the casing when drilling in conventional positive circulation, otherwise the hole will easily collapse; there are the following defects in following the casing: first, following the casing The operation of connecting and unloading drilling tools is relatively complicated, and the labor intensity of workers is high; second, the casing is severely worn in the sand and pebble layer, the frequency of repeated use is not high, and the consumption is large

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