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A hard coal anti-scouring and pressure relief drilling construction method and equipment

A construction method and anti-scouring technology, which is applied in earth square drilling, liquid/gas jet drilling, ground mining, etc., and can solve problems such as dust accumulation, low-efficiency drilling, stuck drill and lost rods, etc.

Active Publication Date: 2021-05-28
NORTH CHINA INST OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The "break first and then break" drilling technology changes the mechanical drilling mode, retains the mechanical crushing characteristics, improves the drilling efficiency, and integrates the hydraulic anti-scour characteristics, so as to effectively solve the inefficient drilling of coal seam anti-scour drilling , sticking drill rods, powder accumulation and dust accumulation, etc.

Method used

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  • A hard coal anti-scouring and pressure relief drilling construction method and equipment
  • A hard coal anti-scouring and pressure relief drilling construction method and equipment
  • A hard coal anti-scouring and pressure relief drilling construction method and equipment

Examples

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Embodiment 1

[0048] As a typical deep mine (mining depth exceeding 1000m), Yuncheng Coal Mine in Shandong Province is seriously threatened by rock burst disasters. In the past two years, there have been 6 occurrences of rock bursts in the Yuncheng mine field, causing damage to hundreds of meters of roadways, causing large economic losses to mining companies, and also seriously threatening the lives of underground personnel.

[0049] The mineable coal seam of Yuncheng Coal Mine is 3 coal seams, with an average thickness of 6.3m and a unidirectional compressive strength of 15MPa. During the process of roadway excavation and working face mining, it is threatened by rock burst. The Yuncheng Coal Mine used to use column-type pressure relief drilling rigs for construction. Three people worked as a shift. Under normal conditions where the drill did not get stuck, one shift constructed 3 pressure relief drilling holes, ie 75m.

[0050] The method of the present invention is used to implement large...

Embodiment 2

[0065] A kind of hard coal anti-scouring and pressure-relieving drilling construction method adopts the coal seam anti-scouring drilling technology of mechanical drilling and hydraulic jet drilling, and the steps are:

[0066] (1) First use high-pressure water to wash down the coal body and form a drilling section; the pressure of the high-pressure water flow is greater than the compressive strength of the coal body and is not greater than 30MPa. The drilling diameter after punching is 100-150mm. (2) Reuse the drilling rig to break the washed down coal body;

[0067] (3) Then use the water flow to wash out the coal powder.

[0068] The hard coal refers to the Platts coefficient f>2.

[0069] A kind of hard coal anti-scouring and pressure-relief drilling construction method of the present invention adopts the coal seam anti-scouring drilling technology of mechanical drilling and hydraulic jet drilling, first uses high-pressure water to wash down the coal body and forms a dril...

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Abstract

The invention discloses a hard coal anti-scouring and pressure-relief drilling construction method and equipment. The coal seam anti-scouring drilling technology adopts mechanical drilling and hydraulic jet drilling. First, the high-pressure water jet is used to wash down the coal body and form a drill The section of the hole, and then use the drill bit to break the washed coal body, and then use the high-pressure water backflow to bring out the coal powder, thus forming a three-level drilling technology of "hydraulic rock falling, mechanical rock breaking, and backflow with rock", which plays a role in drilling. It has the functions of feeding, forming holes, reducing dust, discharging powder and cooling. The "break first and then break" drilling technology changes the mechanical drilling mode, retains the mechanical crushing characteristics, improves the drilling efficiency, and integrates the hydraulic anti-scour characteristics, so as to effectively solve the inefficient drilling of coal seam anti-scour drilling , sticking drill rods, powder accumulation and dust accumulation, etc.

Description

technical field [0001] The invention relates to the technical field of prevention and control of rock burst in coal mines, in particular to a hard coal anti-scouring and pressure-relieving drilling construction method and equipment. Background technique [0002] Rock burst is one of the most serious dynamic disasters faced by coal mines in my country. With the gradual reduction of shallow coal resource reserves, the mining depth continues to increase. According to statistics, coal resource reserves with a depth of more than 1,000 meters account for 53% of the total coal resources in my country. The maximum mining depth is close to 1,500 meters; easy-to-mine coal resources are gradually exhausted, and the proportion of complex and difficult-to-mine coal production is increasing. With the increase of coal mining intensity and the deterioration of coal mining conditions, rock burst disasters are becoming more and more serious. At present, there are more than 160 rock burst mine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/18E21B7/18
CPCE21B7/18E21C41/18
Inventor 刘金海田昭军高林生程建平王永朱权洁曲乐明王维斌居昌波李恒章
Owner NORTH CHINA INST OF SCI & TECH
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