Method for realizing fluidized mining by in-situ oxidative degradation of deep coal

Abstract

The invention belongs to the technical field of coal in-situ oxidative degradation fluidization mining, and provides a deep coal in-situ oxidative degradation fluidization mining method which comprises the following steps: step 1, drilling two horizontal wells in a coal seam to be subjected to fluidization mining, drilling a liquid injection well at the upper part, and drilling a mining well at the lower part; 2, hydrofracture is conducted on the coal seam between the liquid injection well and the mining well till a fracture seepage channel is formed in the coal seam; 3, the oxidant solution is injected into the coal seam through the liquid injection well, so that the oxidant solution and the coal seam generate an oxidation effect, and a fluidized product is generated; and 4, the fluidized product is mined from the mining well. The invention provides a new idea of coal seam oxidation fluidization, and provides reference for coal seam oxidation fluidization mining. The method is mild in application condition, low in equipment requirement, simple in operation process and low in economic cost.

Description

technical field [0001] The invention belongs to the technical field of coal in-situ oxidative degradation and fluidized mining, and particularly relates to a method for realizing fluidized mining by in-situ oxidative degradation of deep coal. Background technique [0002] Coal will remain my country's main energy and basic energy for a long time to come, and nearly 70% of my country's coal resources are distributed at a depth of more than 2,000 m. Therefore, deep coal resource mining is imperative. However, according to the existing mining methods and the development level of mining technology, the mining depth of solid minerals cannot be extended to the depths indefinitely. The traditional mining methods and the current technical level are no longer sufficient to support the mining of deep solid resources. [0003] In order to overcome the problem of the limit depth of traditional coal mining methods and solve the safety and environmental problems in the process of mining d...

AI Technical Summary

Problems solved by technology

However, this technology needs to build a gasification chamber in the goaf, and the gasification conditions are relatively high, which will increase the mining cost

[0005] None of the above content involves the technical content of injecting oxidant into the coal seam to oxidize the coal in situ and directly mine the fluidized products. To this end, a method for in-situ oxidative degradation of deep coal to realize fluidized mining is provided.

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