Igniting an underground coal seam in an underground coal gasification process, ucg

A coal seam and fuel technology, applied in the direction of coal gasification, underground mining, manufacture of combustible gas, etc., can solve the problems of explosion, expensive and dangerous installation of ignition wells

Inactive Publication Date: 2013-10-30
LINC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the problems associated with UCG when using well passages that extend substantially horizontally through the coal seam is that more than one vertically extending ignition well (borehole) may be required in order to ignite / reignite the coal seam at multiple locations / gasifier, since installing a pilot well is an expensive and time-consuming process
In addition, the use of TEB or silane can be hazardous to the handler due to the highly volatile nature of these materials when exposed to air, and any mistake in the process of handling these materials may expose these materials to the air and cause a fire or explosion

Method used

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  • Igniting an underground coal seam in an underground coal gasification process, ucg
  • Igniting an underground coal seam in an underground coal gasification process, ucg
  • Igniting an underground coal seam in an underground coal gasification process, ucg

Examples

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Embodiment Construction

[0082] In the various figures, the same reference numerals refer to the same features.

[0083] see first figure 1 , generally depicts an ignition device 150 configured to ignite an underground coal seam 151 . An injection well 152 is shown having a well head 153 and a well channel 154 extending from a heel of the well 152 through the coal seam 151 .

[0084] The ignition device 150 includes an ignition system, a positioning system, a sensor 170 and a controller 165 .

[0085] The ignition system includes an ignition device and an ignition tool 155 for igniting the underground coal seam 151 from within the well passage 154 (or the well lining surrounding the well passage 154).

[0086] The positioning system includes coiled tubing 156 connected to the ignition tool 155 and extendable through the wellhead 153 in the well passage 154 to position the ignition tool 155 at a desired location in the well passage 154. desired location. The positioning system further includes a re...

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PUM

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Abstract

An ignition apparatus (150) configured to ignite an underground coal seam (151). The ignition apparatus (150) comprising an ignition system, a positioning system, a sensor (170) and a controller (165). The ignition system comprises ignition means and an ignition tool (155) for igniting the underground coal seam (151) from within the well channel (154) or well liner encasing the well channel (154). The positioning system comprises coiled tubing (156) connected to the ignition tool (155) and extendible through a well head (153) within the well channel (154) to position the ignition tool (155) at a desired location within the well channel (154). The positioning system further comprises a spool (157) for transporting and dispensing the coiled tubing (156).

Description

technical field [0001] The present invention relates to a method and apparatus for igniting underground coal seams to convert coal to product gas in situ. Background technique [0002] Underground Coal Gasification (UCG) is a process whereby product gases are produced from coal seams by heating coal in situ in the presence of an oxidizing agent. This product gas is typically referred to as synthesis gas or synthesis gas and can be used, for example, as a feedstock for electrical or chemical production. [0003] Conversion of coal to product gas occurs in a well that typically includes a variety of well passages extending through the coal seam. Such channels may be formed by one or more boreholes drilled into the coal seam, the boreholes being in fluid communication with each other. The channel is also in fluid communication with an injection well, a production well and possibly one or more ignition or service wells extending from ground level to the well channel. Typicall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/243E21B43/295
CPCE21B43/243C10J3/18E21B43/295
Inventor 法扎勒·乌丁·谢赫卡斯珀·扬·亨德利克·伯格格雷格·马丁·帕里·培肯斯
Owner LINC ENERGY
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