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Underground coal gasifying furnace and underground coal gasifying method

An underground gasification and gasification furnace technology, which is applied in coal gasification, underground mining, earth drilling and mining, etc., can solve the problems of slow penetration speed and unstable structure in the gasification production stage, and achieve the effect of eliminating slow penetration speed

Active Publication Date: 2013-12-11
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the relevant technical problems of the prior art, the object of the present invention is to provide an underground coal gasification furnace and an underground coal gasification method, thereby at least eliminating the defects of slow penetration speed and unstable structure in the gasification production stage in the prior art

Method used

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  • Underground coal gasifying furnace and underground coal gasifying method

Examples

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Embodiment 1

[0050] The underground coal gasification furnace and the underground coal gasification method of the present invention are illustrated by taking a horizontal 10m thick bituminous coal seam with a buried depth of 500m somewhere as an example.

[0051] First, see Figure 4 Drill a first vertical drilling well 1 to the middle and lower part of the coal seam in the selected area where the underground gasifier is to be built, drill the first horizontal directional drilling well a to the first vertical drilling well 1 against the development direction of coal seam fissures, and drill the first horizontal directional drilling well a The length of the horizontal borehole in the middle and lower part of the coal seam is 250m, about 5m on both sides of the first horizontal directional drilling a, and a second vertical drilling 2-7 is drilled at an interval of 25m to the middle and lower part of the coal seam, and the second vertical drilling 2 ~7 are alternately distributed on both side...

Embodiment 2

[0058] The underground coal gasification furnace and the underground coal gasification method of the present invention are illustrated by taking a horizontal 8m thick lignite coal seam with a buried depth of 300m as an example.

[0059] First, in the coal seam area selected for underground gasification, the development direction of coal seam fractures is determined according to the geological information, such as Figure 5 The direction indicated by the arrow. Select a point to drill the first vertical drilling 1 to the middle and lower part of the coal seam, and drill the second vertical drilling to the middle and lower part of the coal seam at intervals of about 35m along the development direction of the coal seam fissures, numbered 2, 3, 4, 5, 6, and then in the opposite direction. Drill the first horizontal directional drilling well a in the direction of the first vertical drilling 1 at a point in the direction of the coal seam fissure, and the drilling length in the horiz...

Embodiment 3

[0064] The underground coal gasification furnace and the underground coal gasification method of the present invention are illustrated by taking a 12m thick subbituminous coal seam with a buried depth of 600m somewhere as an example.

[0065] First, see Figure 6 Drill a first vertical drilling well 1 to the middle and lower part of the coal seam in the selected area where the underground gasifier is to be built, drill the first horizontal directional drilling well a to the first vertical drilling well 1 against the development direction of coal seam fissures, and drill the first horizontal directional drilling well a The length of the horizontal drilling in the middle and lower part of the coal seam is 250m, and a second vertical drilling 2, 3 is drilled at a distance of about 100m at 5-15m on one side of the first horizontal directional drilling a to the middle and lower part of the coal seam, distributed in the second The same side of a horizontal directional drilling well ...

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Abstract

The invention provides an underground coal gasifying furnace which comprises an ignition system and a gas injection system, wherein the ignition system is provided with a first vertical drilling well (1) and a first horizontal directional drilling well (a) communicated with the first vertical drilling well; the gas injection system is provided with a second drilling well communicated with a coal seam; at least one second horizontal directional drilling well (b, c, d, e and f) of a horizontal section in the coal seam serves as the second drilling well. The invention also provides an underground coal gasifying method. By adopting the underground coal gasifying furnace and the underground coal gasifying method provided by the invention, the defects of low cut-through speed and unstable structure in a gasifying production section of the prior art are eliminated.

Description

technical field [0001] The invention relates to an underground coal gasification furnace and an underground coal gasification method. Background technique [0002] Underground coal gasification is the process of controlled combustion of underground coal to generate combustible gas through thermal and chemical effects on coal. The underground gasifier is usually composed of an inlet well, a gasification channel, a gas outlet well and an auxiliary monitoring well. The gasification channel and the gas outlet well are transported to the ground. [0003] The underground gasifier type in the narrow sense refers to the shape of the gasification channel, and the underground gasifier type in the broad sense refers to the shape of the channel formed by the type of boreholes used for underground gasification, their mutual positions, the purpose of gasification, and the start-up sequence. [0004] The gasifier type with only one pair of inlet / outlet wells has relatively small gas prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/295
CPCE21B43/006E21B43/295E21B43/305
Inventor 陈峰刘刚潘霞
Owner ENN SCI & TECH DEV
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