Reaming and digging device for coalbed methane mining hole bottom

Abstract

A hole reaming and digging device for the bottom of a coalbed methane mining hole, comprising a connecting drill rod, a reaming drill bit is installed at the lower end of the connecting drill rod, and the inner cavity of the connecting drill rod is set as a flushing liquid circulation channel, and the flushing liquid circulates A flushing fluid back pressure valve is installed in the tunnel, and a digging cylinder is installed in the flushing fluid flow tunnel; the reaming drill bit includes a cutting head and a guide sleeve fixedly connected with the connected drill pipe, and a vertical movement device is installed in the guide sleeve. The guide rod is provided with a plurality of cutting wings for hole reaming operation evenly distributed in the circumferential direction between the guide sleeve outside the guide rod and the cutting head. The invention has the advantages of simple and reliable structure, good stability and safety, is completely suitable for the construction requirements of the coal bed methane excavation well, and has a good market prospect.

Description

technical field [0001] The invention relates to geological prospecting equipment, in particular to a hole reaming and digging device for the bottom of a coalbed methane mining hole. Background technique [0002] The coalbed methane industry is a new industry that has risen in the world in the past 20 years. The development and utilization of coalbed methane can not only prevent the occurrence of coal mine gas accidents fundamentally, improve the safety of coal mine production, but also turn harm into treasure, and turn the coal seam gas in the process of coal mining Effective utilization of natural gas can improve my country's energy structure to a certain extent, increase clean gas energy, and make up for the lack of geographical distribution and supply of conventional natural gas in my country. Some senior experts have long pointed out that the 21st century is the era of coalbed methane development, and coalbed methane is the most realistic and reliable alternative energy s...

AI Technical Summary

Problems solved by technology

[0003] At present, the existing reaming bits with movable blades are mostly used in the construction of coalbed methane excavation wells. With a large number of applications in the construction of coalbed methane excavation wells, the traditional movable blade reaming bits show some defects in application. Since there is no flushing fluid channel aligned with the cutting teeth, the cutting teeth cannot be flushed and cooled during the cutting operation, and self-sharpening cannot be achieved; due to structural reasons, the cuttings in the drilling fluid will stick to the mandrel, which is easy to cause The blade cannot be retracted after digging the hole, and the drill cannot be pulled out; at the same time, the use of the traditional movable blade reaming drill bit makes the hole wall of the reaming unable to be smooth and smooth, and the lower end of the cutter bar is easy to get stuck on the inner wall of the original hole during the equipment lowering process. , destroying the inner wall of the hole

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