Large-diameter lifesaving hole slurry gas lift reverse circulation hole forming method

Abstract

The invention discloses a large-diameter lifesaving hole slurry gas lift reverse circulation hole forming method. The method comprises the following steps that S1, a drilling structure is designed, and the size of a drill bit and a drilling machine with a double-wall power head are determined; S2, according to the size of the drill bit in the step S1, a drilling tool combination mode including a roller bit, a gas-water mixing connector, a centralizer, a double-wall drill collar, a centralizer, a double-wall drill collar and a double-wall drill rod is determined; S3, an air inlet of the double-wall drill rod communicates with an air compressor, and an air outlet is located above a mud pit; and S4, drilling is conducted in a slurry gas lift reverse circulation mode. According to the large-diameter life-saving hole slurry gas lift reverse circulation hole forming method, the drill rod is arranged to be used for stirring the drilling slag at the bottom of the hole to form a disturbance area, the slag is discharged through a slag discharging pipe, and the drilling slag carrying capacity of the slag discharging pipe is effectively improved.

Description

technical field [0001] The invention relates to the technical field of rescue hole technology, in particular to a large-diameter rescue hole mud gas lift reverse circulation hole forming method. Background technique [0002] Conventional large-diameter drilling mud positive circulation construction technology is rarely used in mining accident rescue due to slow mud return speed, incomplete slag discharge, and low construction efficiency. Large-diameter rescue holes generally use large-diameter submerged holes Hammer air reverse circulation construction process. When it is not possible to use the down-the-hole hammer for drilling due to geological conditions or the drilling structure design does not have a matching down-the-hole hammer, the large-diameter roller cone bit mud gas lift reverse circulation drilling process can be used. The mud gas lift reverse circulation is generally built in a single-wall drill pipe The construction method of air pipe is widely used. Large-di...

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Problems solved by technology

[0002] Conventional large-diameter drilling mud positive circulation construction technology is rarely used in mining accident rescue due to slow mud return speed, incomplete slag discharge, and low construction efficiency. Large-diameter rescue holes generally use large-diameter submerged holes Hammer air reverse circulation construction technology

When it is not possible to use the down-the-hole hammer for drilling due to geological conditions or the drilling structure design does not have a matching down-the-hole hammer, the large-diameter roller cone bit mud gas lift reverse circulation drilling process can be used. The mud gas lift reverse circulation is generally built in a single-wall drill pipe The construction method of air pipe is widely used. Large-diameter down-the-hole hammer air reverse circulation construction, drilling rig power head and drill pipe are double-walled. If the traditional mud gas lift reverse circulation construction method is used, the drilling rig power head and drill pipe need to be replaced. pole, that would waste a lot of time and manpower

[0003] The publication number is CN111706276A, which discloses a construction method of gas-lift anti-slag forming holes. The steel mud pool and the steel sedimentation tank are supported on the water by a support frame. The mud in the mud pool is pumped back to the bored pile, and the mud can be recycled for many times, which increases the number of times the mud is used, reduces the amount of new mud, can reduce the cost of materials, and can avoid the construction of the pile foundation on the water. contamination of the environment; but it still requires replacement of drilling tools followed by installation of gas lift equipment

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