Coal underground gasified drill hole and constructing method of drill hole

Abstract

The invention discloses a coal underground gasified drill hole and a constructing method of the coal underground gasified drill hole. The drill hole comprises a first hole which extends to a top plate of a coal layer from the earth surface, and further comprises a support body and a second hole which penetrates through the support body, the top of the support body is located in the top plate of the coal layer, the bottom of the support body is located on the bottom plate, one end of the second hole is communicated with the first hole, and the other end of the second hole is located in the coal layer. According to the coal underground gasified drill hole and the constructing method of the coal underground gasified drill hole, one support body is arranged in the coal layer, the support body supports the top plate from the bottom plate of the coal layer, in this way, the top plate is prevented from deformation and caving, and therefore the drill hole located in the top plate is protected.

Description

technical field [0001] The invention relates to coal mining technology, in particular to a drilling hole for underground coal gasification and a construction method thereof. Background technique [0002] Underground coal gasification technology is a process in which coal buried underground is burned directly and controlled, and combustible gas is generated through the thermal and chemical effects of coal. Obviously, in order to maintain controllable underground combustion, it is necessary to drill a series of drill holes from the surface to the coal seam or the coal seam floor, and each borehole is used to transport various reactants (such as gasification agent) to the underground combustion zone. , or output the reaction products from the underground combustion zone to the surface, or arrange equipment (such as pipelines), or even transport other materials. [0003] figure 1 It is a schematic diagram of the structure of the drill hole in the prior art, which extends from ...

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Problems solved by technology

[0004] The disadvantage of the existing technology is that after the gasification of the coal bed, a burn-out area will be formed. At this time, the roof supported by the coal bed will collapse, deform or even break due to the support. Tensile, twisting and shearing forces are applied to the casing and the casing, which makes the borehole prone to damage or even destruction, thereby losing the ability to work

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