In-hole jet-suction cuttings removing and reaming method for horizontal directional drilling

Abstract

The invention relates to an in-hole jet-suction cuttings removing and reaming method for horizontal directional drilling. The in-hole jet-suction cuttings removing and reaming method includes that after completing drilling of a guide hole, a jet-suction type reamer is connected onto a drill pipe on an unearthed side, a drill pipe or pipeline is connected onto the rear of the reamer, a slurry pump or an air compressor is started up during reaming, and high-pressure fluid is delivered from the a high-pressure rubber hose, a drilling machine and the drill to the inner side of the reamer; the high-pressure fluid is jetted out from a jet flow nozzle at a high speed, negative pressure is generated in a suction chamber, and slurry fluid containing drilling cuttings on the periphery of the reamer is sucked into the suction chamber through suction inlets and blended with the high-pressure fluid jetted out from the nozzle in a throat and expansion section prior to being discharged into an earth surface sedimentation tank through the drilling pipe or the pipeline at the rear of the reamer and flowing back to a drilling hole after purification and blending; the reamer comes out from an earth-digging side to complete primary reaming, and if the drilled hole needs to be further enlarged, then a larger reamer is selected to perform repeated reaming till the hole diameter acquirement is met. By the method, drilling cuttings conveyance speed is dozens of times even a hundred times that of a conventional mode, so that cuttings can be removed thoroughly, and cuttings removal efficiency is high.

Description

Technical field [0001] The invention relates to a method for reaming holes by jet suction and chip removal in a horizontally oriented borehole, in particular to a method for applying the principle of jet suction to suck the broken drill cuttings together with the mud in the borehole through the suction port of a jet suction reamer. A method for reaming a hole in a jet suction device and quickly discharged to the surface through a drill rod or pipe connected at the rear of the jet suction reamer belongs to the field of geological engineering. Background technique [0002] In the construction process of horizontal directional drilling, the efficiency of chip removal has an important influence on the hole reaming speed, drilling safety, construction cost and environmental protection. At present, in the reaming construction of horizontal directional drilling, the high-pressure mud pumped from the surface through the drill string is discharged into the borehole through the reamer wate...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to solve the chip removal problem existing in the current horizontal directional drilling and reaming process, and provide a horizontal directional drilling with high chip removal efficiency, low mud cost, less waste slurry, and will not cause formation fracturing In-hole injection-suction chip removal reaming method

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