Coring drilling tool with compressed air as conveying medium and scouring medium

Abstract

The invention provides a coring drilling tool with compressed air as a conveying medium and a scouring medium. The coring drilling tool comprises a coring device and an auxiliary device; the auxiliary device comprises a drill rod and a positioning ring arranged in the drill rod; the coring device comprises a rod body, a penetrating mechanism, a sealing ring and a suspension ring; the rod body is sleeved with the drill rod; a gas circulation channel is formed in the rod body; a gas hole is formed in the side wall of the middle of the rod body and communicates with the gas circulation channel; the penetrating mechanism is arranged in the rod body and used for controlling opening and closing of the gas hole and the gas circulation channel; the rod body is sleeved with the sealing ring, and the sealing ring is used for guaranteeing the sealing performance of the rod body and the drill rod; and the suspension ring is connected to the end of the rod body. In the propelling process of the coring device, the suspension ring abuts against the positioning ring. According to the coring drilling tool, the compressed air serves as the conveying medium and the scouring medium, a rock core and a rock core tube are protected, waste gas of a down-the-hole hammer is prevented from blowing away the rock core, and powder slag is prevented from being accumulated between a hammer head and the rock core tube; and the compressed air serves as the scouring medium, water resources are saved, and the environment is protected.

Description

technical field [0001] The invention relates to the technical field of wireline coring in geological exploration, in particular to a core drilling tool using compressed air as a transport medium and a flushing medium. Background technique [0002] At present, the widely used wireline coring mostly adopts the method of diamond bit grinding + flushing fluid delivery coring device + flushing fluid scouring, the drilling fluid is easy to lose during horizontal drilling, resulting in problems such as sticking, burning, and rapid wear of the seal. Drilling fluid is easy to disperse and pollute the core, affecting the rate of coring and judgment of lithology. Moreover, in water-deficient alpine regions, it is difficult to configure drilling fluid and the cost is high. [0003] There are a small number of pneumatic DTH hammers on the market to impact wireline coring, most of which are vertical coring, the drilling distance is short, and the integrity of the core cannot be guarantee...

AI Technical Summary

Problems solved by technology

[0002] At present, the widely used wireline coring mostly adopts the method of diamond bit grinding + flushing fluid delivery coring device + flushing fluid scouring, the drilling fluid is easy to lose during horizontal drilling, resulting in problems such as sticking, burning, and rapid wear of the seal. Drilling fluid is easy to disperse and contaminate the core, which affects the coring rate and lithology judgment

Moreover, in water-deficient alpine regions, it is difficult to configure drilling fluid and the cost is high

[0003] There are a small number of pneumatic DTH hammers on the market to impact wireline coring, most of which are vertical coring, the drilling distance is short, and it cannot guarantee the integrity of the core

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