Double-acting double-pipe single-bit coring drilling tool and application method thereof

Abstract

The invention discloses a double-acting double-pipe single-bit coring drilling tool and an application method thereof, and belongs to the field of geological exploration boring machines. The double-acting double-pipe single-bit coring drilling tool comprises an inner-outer core barrel connector, an outer pipe, an inner pipe and a drill bit body arranged at one end of the inner pipe. The outer pipe and the inner pipe are fixed to the inner-outer core barrel connector. An annular gap is reserved between the outer pipe and the inner pipe. A water dividing hole is formed in the inner-outer core barrel connector. Four to eight flange ribs are uniformly distributed on the outer side face of the drill bit body and each provided with a step. The steps of the flange ribs are sleeved with the end of the outer pipe. A row of hard alloy drill bits is embedded in the bottom face of the drill bit body, and a row of hard alloy drill bits are embedded in the bottom faces of the flange ribs. The coaxiality and the integral rigidity of the drilling tool are improved by means of the flange rib type drill bits, and vibration of the drilling tool during drilling is reduced; in addition, the rock core sampling quality and efficiency of quaternary loose strata, bed rock weathering zones and coal seam outcrops are remarkably improved; and meanwhile, the drilling efficiency is improved.

Description

technical field [0001] The invention relates to a core drilling tool in the field of geological exploration engineering, more specifically, to a double-action, double-tube, single-bit core drilling tool and its use method. Background technique [0002] In the field of geological exploration engineering, single-tube and double-tube core drilling tools are generally used for coring in loose formations. During the drilling process of the single-tube core drilling tool, the core directly enters the core tube, and the core rotates with the rotation of the core tube during drilling. However, during the drilling process, flushing fluid is required to protect the hole wall, remove rock dust, cool the drill bit, and lubricate the drill tool. etc., while the flushing fluid directly passes through the core, which has a large erosion effect on the core, so it is difficult to maintain the original shape, in-situ and authenticity of the structure with the underground formation; the double...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the above-mentioned deficiencies existing in the existing double-action double-tube drilling tool, to provide a double-action double-tube single-bit core drilling tool and its use method. The coaxiality and overall rigidity of the drilling tool are increased, the vibration of the drilling tool during drilling is reduced, and problems such as drilling bending will not occur; and the use of the water-passing section between the flange ribs effectively prevents the flushing fluid from directly washing the core The quality and recovery rate of rock cores in Quaternary loose strata, bedrock weathered zones, and coal seam outcrops have been significantly improved, and the recovery rate has reached more than 75%. At the same time, only one cemented carbide drill bit is used, and the water area Large size, fast removal of rock powder, no problems such as mud pack bit when drilling in soft formations, improving drilling efficiency and relatively reducing the cost of drilling tools

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