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Underground gasification ignition method

a gasification ignition and underground technology, applied in the direction of directional drilling, well accessories, borehole/well accessories, etc., can solve the problems of low efficiency and achieve the effect of fast penetration speed and high ignition efficiency

Inactive Publication Date: 2016-09-01
ENN COAL GASIFICATION MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a method of creating an underground gasification furnace using directional drilling and vertical wells. The coal seam is pre-penetrated in a cold fracturing process and ignition is made in the vertical well at the end of the directional drilling. The method has the advantages of high ignition efficiency and fast penetrating speed. Compared to prior art methods, the present invention is more efficient and efficient in creating the gasification furnace.

Problems solved by technology

It means that flame moving slowly would result in low efficiency.

Method used

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embodiment 1

[0057]A method of underground gasification ignition comprising the following steps:[0058](1′) creating a directional drilling and a vertical well to construct an underground gasification furnace, wherein the number of the vertical well is 1;[0059](2′) pre-penetrating coal seam in the manner of cold fracturing;[0060](3′) igniting in the vertical well at the end of the directional drilling.[0061](4′) when the coal-burning volume is ≧0.5 cube meter, a ignition source being considered to be formed; then it being switched to the status that gas is introduced through the directional drilling, and gas is discharged through the vertical well and the gasification channel being processed with firepower.

embodiment 2

[0062]A method of underground gasification ignition comprising the following steps:[0063](1′) creating a directional drilling well and vertical wells to construct an underground gasification furnace, wherein the number of the vertical wells is 2;[0064](2′) pre-penetrating coal seam in the manner of cold fracturing;[0065](3′) igniting in one of the vertical wells at the end of the directional drilling; gas being discharged through the other vertical well; pressure maintenance being made for the directional drilling during the process of the vertical well ignition and penetration;[0066](4′) when the coal-burning volume is ≧0.5 cubic meter, a ignition source being considered to be formed; then it being switched according to the position of ignition hole to the status that air is introduced through the directional drilling, and gas is discharged through the ignition vertical well and the gasification channel being processed with firepower.

embodiment 3

[0067]A method of underground gasification ignition comprising the following steps:[0068](1′) creating a directional drilling and vertical wells to construct an underground gasification furnace, wherein the number of the vertical wells is 2;[0069](2′) pre-penetrating coal seam in the manner of cold fracturing;[0070](3′) igniting in one of the vertical wells at the end of the directional drilling; gas being discharged through the other vertical well; pressure maintenance being made for the directional drilling during the process of vertical well ignition and penetration;[0071](4′) when the coal-burning volume is ≧0.5 cube meter, a ignition source is considered to be formed; then it being switched according to the position of ignition hole to the status that gas is introduced through the previously gas outlet vertical well, and gas is discharged through the ignition vertical well, and the gasification channel being processed with firepower.

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Abstract

An underground gasification ignition method comprises the following steps: making a directional drilling and a vertical well to construct an underground gasification furnace; using a cold fracturing method to pre-penetrate a coal seam; and igniting in the vertical well at an end of the directional drilling.

Description

TECHNICAL FIELD[0001]The present invention relates to a method of underground gasification ignition, applicable in fields such as underground coal gasification.BACKGROUND[0002]The underground coal gasification is a process in which the underground coal is transferred in situ into combustible gas through thermal chemistry reaction. As a clean coal technology, underground coal gasification has obvious technological advantages in mining low grade coal seam, deep coal seam, thin coal seam and three under-coals (under waters, buildings or roads), thus being particularly suitable for the energy resource situation of amplitude of coal, short of oil and deficiency of gas. The technology of underground coal gasification has the economical and social benefits of small investment, short construction period and friendly circumstance, thus it has received highly attention in the international coal industry. In recent few years, as the energy situation becomes more and more stressful, science res...

Claims

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Application Information

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IPC IPC(8): E21B43/295E21B7/04
CPCE21B43/295E21B43/26E21B7/04E21C43/00E21B43/243
Inventor CHEN, FENGLIU, HONGTAO
Owner ENN COAL GASIFICATION MINING