Treatment method for upper stratum of underground gasification channel and method for building underground gasification furnace

Abstract

The invention relates to a method for treating the strata above an underground gasification channel and a method for building an underground gasification furnace. The above processing method includes: establishing a passage in the rock formation above the underground gasification passage and / or in the aquifer above the rock formation; injecting a reinforcement agent into the passage when a passage is established in the rock formation, so that the reinforcement agent is in the passage and its surroundings. Solidification in the rock formation; when a channel is established in the aquifer, an expanding material is injected into the channel so that the expanding material absorbs the water contained in the aquifer surrounding the channel. The method for building an underground gasification furnace includes: strengthening the rock formation and / or absorbing water in the aquifer according to the above-mentioned treatment method; establishing an inlet well, a horizontal passage and a gas outlet well, wherein the horizontal passage is located in the reinforced rock formation or the aquifer in which the water content has been reduced in the coal seam below. During the underground gasification process, it can ensure that the rock formation above the gasification channel is firm and / or prevent the water contained in the aquifer from entering the combustion zone, thereby improving the service life of the underground gasification furnace.

Description

technical field [0001] The invention relates to a method for treating the strata above an underground gasification channel and a method for building an underground gasification furnace. Background technique [0002] The underground gasification process is a brand-new coal mining method, which is fundamentally different from the traditional physical coal mining method. Underground gasification is a chemical coal mining method. The coal buried in the ground is burned in a controlled manner on the spot. Combustible gas is produced through the thermal action and chemical reaction of coal and delivered. However, during the gasification process, with the gradual increase of the burn-out zone, the pressure on the rock stratum continues to increase. Once the rock strata collapses, the water in the weak aquifer will enter the underground gasifier, making the gasifier If the temperature drops, it will even extinguish the flame, causing the failure of underground gasification. [000...

AI Technical Summary

Problems solved by technology

However, during the gasification process, with the gradual increase of the burn-out zone, the pressure on the rock stratum continues to increase. Once the rock strata collapses, the water in the weak aquifer will enter the underground gasifier, making the gasifier The temperature will drop, and even the flame will be extinguished, causing the failure of underground gasification

[0003] Patent 200910307130.9 mentions a method for reserving rock formation support columns, mainly injecting cement slurry and other coagulation materials into a section of the coal seam, and then gasifying. This method is simple to operate, but the cement slurry reserved in the coal seam The column will affect the gasification effect, making it difficult to uniformly control and regulate the entire gasification furnace during the gasification process

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