All hole depth different-diameter hole protecting and hole sealing system and method for deep-buried soft coal seam

Abstract

The invention provides an all hole depth different-diameter hole protecting and hole sealing system and method for a deep-buried soft coal seam. The system involves a small floral tube hole protectingsection, a large floral tube hole protecting section and a hole sealing section which are sequentially arranged form a hole bottom part to a hole opening of a drilled hole, wherein the small floral tube hole protecting section is provided with a plurality of small floral tubes which are sequentially connected, the large floral tube hole protecting section is provided with a plurality of large floral tubes which are sequentially connected, the tube diameter of the small floral tubes is smaller than the tube diameter of the large floral tubes, and the end parts of the small floral tubes adjacent to the large floral tubes are arranged in the large floral tubes; and the hole sealing section comprises a plurality of short connecting tubes which are sequentially connected, the end parts of every adjacent short connecting pipes are connected with each other through a soft connecting buried wire tubes, the end parts of the short connecting tubes adjacent to the large floral tubes communicatewith the large floral tubes, and plugging materials are arranged between the short connecting tubes and the inner wall of the drilled hole. The all hole depth different-diameter hole protecting and hole sealing system has the advantages that the process is simple, the construction is convenient, the hole sealing time is shortened, the labor efficiency is improved, all hole depth hole protecting ofgas extraction drilling is realized, and the drilling gas extraction efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of gas drainage, in particular to a sealing system and method for full-hole deep and different-diameter protection holes in deep-buried soft coal seams. Background technique [0002] Mine gas is one of the major disasters in coal mines, which has threatened the safety of coal mine production and affected economic benefits for a long time. The research on gas occurrence, gas gushing and gas prevention technology has always been the research topic of my country's coal front, especially Gaotu gas mine. [0003] Gas drainage is the fundamental way to control mine gas. With the increase of mining depth in most of the country's mining areas, the complexity of coal seam gas geological factors and the difficulty of gas control are increasing. In recent years, with the continuous update and use of coal mine gas control technology and equipment, a good situation has emerged for large-scale gas control, and large-aper...

AI Technical Summary

Problems solved by technology

However, the influence of the structural stress of the coal rock mass in the grouting section is ignored, and long-distance hard sealing materials are used to seal the hole. Due to the concentration of structural stress in the coal rock wall area at the hole opening of the deep-buried soft coal rock mass, the hole protection pipe and Hard plugging materials such as grouting sections are often fractured and broken, resulting in gas leakage in gas drainage boreholes and low gas drainage efficiency

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