Underground gasification ignition method

An underground gasification and fire source technology, applied in coal gasification, underground mining, earth drilling and mining, etc., can solve the problems of low ignition efficiency, slow flame moving speed, long channel processing time, etc., and achieve high ignition efficiency and penetration speed fast effect

Inactive Publication Date: 2014-04-16
ENN SCI & TECH DEV
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Problems solved by technology

[0004] The ignition of existing underground gasifiers is mainly to build a vertical well first, and then ignite in the vertical well. First, a fire zone is established at the bottom of the vertical well, and then directional drilling is created. After the directional drilling is completed, the channel is penetrated by fire power. Since only the vertical well is processed during ignition, the penetration speed of the vertical well is slow when the fire zone is formed, the channel processing time is long, and the flame moving speed is slow, resulting in ignition efficiency. Low

Method used

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specific Embodiment approach 1

[0063] An underground gasification ignition method, comprising the steps of:

[0064] (1’) Create directional drilling and vertical wells to build underground gasifiers, and the number of vertical wells is 1;

[0065] (2’) Pre-penetrate the coal seam by cold fracturing;

[0066] (3’) fire in the vertical well at the end of the directional drilling,

[0067] (4’) When the volume of coal burning is ≥0.5 cubic meters, it is considered that the fire source is formed, and the directional drilling is switched to enter the air, the vertical well is to output the gas, and the gasification channel is processed by thermal power.

specific Embodiment approach 2

[0068] An underground gasification ignition method, comprising the steps of:

[0069] (1’) Build directional drilling and vertical wells to build underground gasifiers, and the number of vertical wells is 2;

[0070] (2') Use cold fracturing method to pre-perforate the coal seam; (3') One of the vertical wells at the end of the directional drilling is ignited, and the other vertical well outputs gas, and the directional drilling is carried out during the ignition and penetration of the vertical well. hold pressure;

[0071] (4’) When the volume of coal burning is ≥0.5 cubic meters, it is considered that the fire source is formed. According to the position of the ignition hole, it is switched to directional drilling for air intake, igniting the vertical well for gas output, and thermal processing for gasification channels.

specific Embodiment approach 3

[0072] An underground gasification ignition method, comprising the steps of:

[0073] (1’) Build directional drilling and vertical wells to build underground gasifiers, and the number of vertical wells is 2;

[0074] (2’) Pre-penetrate the coal seam by cold fracturing;

[0075] (3’) One of the vertical wells at the end of the directional drilling is ignited, and the other vertical well outputs gas, and the pressure of the directional drilling is maintained during the ignition and penetration of the vertical well;

[0076] (4’) When the volume of coal burning is ≥0.5 cubic meters, it is considered that the fire source is formed. According to the position of the ignition hole, it is switched to the original gas outlet vertical well for intake, the ignition vertical well for gas outlet, and the gasification channel for thermal processing.

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Abstract

The invention discloses an underground gasification ignition method. The method includes the steps: building a directional drilled well and a vertical well to construct an underground gasifier; pre-driving a coal seam by means of cold fracturing; igniting in the vertical well at the tail end of the directional drilled well. The method has the advantages that ignition efficiency is high and driving speed is high.

Description

technical field [0001] The invention relates to an underground gasification ignition method, which is suitable for the fields of underground coal gasification and the like. Background technique [0002] Underground coal gasification is the process of converting underground coal into combustible gas in situ through thermochemical reactions. As a clean coal technology, it has significant technical advantages in mining low-quality coal seams, deep coal seams, thin coal seams, and "three under" (under water, under buildings, under roads) coal pressing, etc., especially suitable for "rich coal, less my country's energy situation of oil and gas shortage. Underground coal gasification technology has economic and social benefits such as low investment, short construction period, and environmental friendliness, and has attracted great attention from the international coal industry. In recent years, with the increasingly tense energy situation, scientific research institutes and rela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/247
CPCE21B43/243E21B43/295E21B7/04E21B43/26
Inventor 陈峰刘洪涛
Owner ENN SCI & TECH DEV
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