Method for realizing drilling and hole sealing based on drill cuttings during uplink gas extraction

Abstract

The invention provides a method for realizing drilling and hole sealing based on drill cuttings during uplink gas extraction. The method comprises the following steps: constructing a large drilled hole in a coal body upwards; inserting a PVC (Polyvinyl Chloride) drivepipe with the total length of 14m and the diameter of phi 90mm into the large drilled hole after drill removing, wherein the distance between the inner end of the PVC drivepipe and the bottom of the hole is 1.5m; fixing two ends of the PVC drivepipe by use of fixing racks; sealing the PVC drivepipe in the port end of the large drilled hole and the large drilled hole by use of polyurethane; then continuously drilling inward along the interior of the large drilled hole so as to construct a small drilled hole, wherein the drill cuttings discharged during the drilling process fall into gaps between the PVC drivepipe and the wall surface of the large drilled hole due to the action of gravity so as to automatically fill and compact the gaps between the PVC drivepipe ad the wall surface of the large drilled hole, so that integration of drilling and hole sealing is realized; after drilling the small drilled hole at a preset position, completely removing a drill stem; connecting the outer end of the PVC drivepipe with a gas extraction pipe by virtue of a reducing joint so as to finish the whole hole sealing process. The method provided by the invention is reasonable in design, convenient in operation and simple in process; the hole sealing process can be finished by use of the drill cuttings discharged in the drilling progress, so that the hole sealing cost is lowered, and the hole sealing efficiency is improved.

Description

technical field [0001] The invention relates to a hole sealing method, in particular to a drilling cuttings sealing method suitable for upward gas drainage in underground coal mines. Background technique [0002] Most of the coal mines in my country are mines with gas gushing, and the annual gas gushing volume of coal mines in the country is 10 billion m 3 above. With the continuous increase of mining depth, the ground stress and gas pressure are increasing, the amount of gas gushing is increasing, and the danger of coal and gas outburst is also increasing. Gas accidents have become one of the most harmful natural disasters in my country's coal mine disasters. [0003] In the process of controlling coal mine gas problem, gas drainage is one of the most effective measures. Since the 1950s, my country has taken gas drainage as an important measure to control coal mine gas disasters, and promoted it in high gas and outburst mines. After decades of development, my country's g...

AI Technical Summary

Problems solved by technology

[0007] Technical problem: The purpose of the present invention is to provide a convenient, low-cost, high-efficiency upward gas drainage drilling and sealing method for the problems of high sealing cost and low sealing efficiency in the prior art

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