Method for draining coal seam gas

A technology for coal seam gas and coal seam, which is applied in the field of coal mine pre-drainage of coal seam gas in the developed area or its adjacent area, can solve the problems of unfavorable gas extraction, large production investment, low methane concentration, etc., and achieves the improvement of gas efficiency. Effect

Active Publication Date: 2012-07-18
华晋煤层气综合利用有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: 1) The drainage and depressurization cycle is long, and the well holes must be far away from the coal mine production and operation area, so as to ensure that the gas well will not be damaged by the mining activities of the coal mine during the effective production period
3) The burial of the drainage operation site and the gas pipeline needs to occupy land, which increases the cost and has adverse effects on the ecological environment
The disadvantages are: 1) Due to various factors, the quality of downhole drilling and sealing is low, the air tightness is poor, and the produced gas gas is mixed with downhole air to varying degrees, resulting in low methane concentration. Generally, it can only be used as a gas-fired boiler. air source for heating or power generation
At present, there is still a large amount of produced gas in domestic coal mines, which cannot be used because the methane concentration is too l

Method used

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  • Method for draining coal seam gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 As shown, a method for extracting coal seam gas in this embodiment, it first opens up a butt hole drilling site 2 in the coal mine underground preparation roadway 1, and constructs a 30-50m methane drilling site from the butt hole drilling site to the target coal seam 3 In the butt hole 4 of the butt hole 4, a seamless steel casing 5 is inserted and cemented with high-grade cement 6; then, at the far end of the designed drainage area 7, a ground drilling field 8 is opened, and the butt hole is drilled downhole. The horizontal directional main branch hole 9 is drilled in the direction of the hole 4 along the construction of the target coal seam 3, and the horizontal directional main branch hole 9 is docked with the downhole docking hole 4 through the docking point 10; The orifice control valve is installed on the pipe head of the seam steel casing 5, and the control valve is connected with the coal mine underground gas drainage pipe network, and the coal...

Embodiment 2

[0027] Such as figure 2 As shown, a method for extracting coal seam gas in this embodiment, first of all, two docking hole drilling sites 2 are opened in the preparation roadway 1 of the coal mine, and one drilling site is constructed from the two docking hole drilling sites to the target coal seam 3 respectively. 30-50m butt borehole 4, run seamless steel casing 5 into butt borehole 4 and fix the hole with high-grade cement 6; Two horizontal directional drilling horizontal directional main branch holes 9 are constructed along the target coal seam 3 in the direction of the downhole docking hole 4, and the horizontal directional main branch hole 9 is docked with the downhole docking hole 4 through the docking point 10; An orifice control valve is installed on the pipe heads of two seamless steel casings 5 ​​that are drilled but connected, and the control valve is connected to the underground gas drainage pipe network of the coal mine, and the gas drainage pump is used for gas ...

Embodiment 3

[0031] Such as image 3 As shown, a method for extracting coal seam gas in this embodiment, first of all, three docking hole drilling sites 2 are opened in the underground preparation roadway 1 of the coal mine, and one drilling site 2 is constructed from the three docking hole drilling sites to the target coal seam 3 respectively. 30-50m butt borehole 4, run seamless steel casing 5 into butt borehole 4 and fix the hole with high-grade cement 6; Three horizontal directional drilling horizontal directional main branch holes 9 are constructed along the target coal seam 3 in the direction of the downhole docking hole 4, and the horizontal directional main branch hole 9 is docked with the downhole butt hole 4 through the docking point 10; An orifice control valve is installed on the pipe heads of two seamless steel casings 5 ​​that are drilled but connected, and the control valve is connected with the coal mine underground gas drainage pipe network, and the coal mine gas drainage ...

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Abstract

The invention relates to a method for draining coal seam gas, belonging to a method for pre-draining coal seam gas in coal mines. According to the invention, the technical problem that the existing methods for draining coal seam gas are low in drainage efficiency is solved. The technical scheme of the method for draining coal seam gas comprises the steps of: firstly opening at least one butt hole drill site in a coal mine underground preparation roadway, constructing a 30-50m long butt drill hole from the butt hole drill site to a target coal seam, lowering a seamless steel sleeve to the butt drill hole and solidifying the hole by high-quality cement, then opening a ground drill site at the far end of a designed drainage area, horizontally and directionally drilling a horizontal directional main branch hole along the target coal seam toward the underground butt drill hole, butt-jointing the horizontal directional main branch hole with the underground but drill hole, enclosing the ground orifice, arranging an orifice control valve on the head of the seamless steel sleeve, connecting the control valve with a coal mine underground gas drainage pipe network, and carrying out gas drainage by using a coal mine gas drainage pump.

Description

technical field [0001] The invention relates to a method for extracting coal seam gas, which belongs to a method suitable for coal mines to pre-extract coal seam gas in developed areas or adjacent areas. Background technique [0002] Coal mine gas (also known as "coal bed methane", the main component is methane) is one of the main disasters that threaten the safety of coal mine production, and it is also a clean energy with abundant reserves. At present, mines threatened by gas disasters in my country (especially high gas mines) have generally adopted the pre-pumping method to prevent and control gas disasters, and utilize the extracted gas. [0003] At present, coal mine gas extraction methods can be generally divided into two categories: surface drilling extraction and underground extraction. Among them: surface drilling drainage can be divided into vertical well drainage and horizontal directional drilling drainage; underground drainage includes two forms: underground dr...

Claims

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Application Information

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IPC IPC(8): E21F7/00
Inventor 李进鹏乔炜张沛牛金荣黎凤岐张铁军牛国斌
Owner 华晋煤层气综合利用有限责任公司
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