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Poly-generation shaftless coal underground gasification method

An underground gasification, well-less technology, applied in coal gasification, underground mining, earth drilling and mining, etc., can solve problems such as underground environmental pollution, large-area underground fires, gas explosions, etc., to reduce the amount of drilling engineering and improve Utilization rate and the effect of reducing production cost

Active Publication Date: 2019-08-20
CHINA UNIV OF MINING & TECH
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Problems solved by technology

After the coal gasification process is completed, there are still residual coal and fire areas underground, which may cause gas explosions and large-scale underground fires, causing serious safety hazards and polluting the underground environment. Therefore, how to effectively extinguish the gasifier The problem of the fire zone is more prominent

Method used

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  • Poly-generation shaftless coal underground gasification method
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Embodiment Construction

[0021] Below in conjunction with accompanying drawing, the present invention will be further described (hereinafter referred to as figure 1 The left side direction is described as the front).

[0022] like figure 1 As shown, the multi-generation well-less underground coal gasification method specifically includes the following steps:

[0023] a) Drilling operation: firstly adopt the directional drilling technology, from the ground 11 to the direction of the coal seam 12 and construct two inclined boreholes from back to front, that is, the included angle between the inclined borehole and the coal seam 12 in front is The obtuse angle setting, such setting can facilitate the subsequent turning and drilling of the coal seam drilling section. After the two inclined drilling holes are drilled to the coal seam 12 respectively, they continue to drill forward along the coal seam 12 for a set distance to form two coal seam drilling sections. Two inclined boreholes and two coal seam bo...

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Abstract

The invention discloses a poly-generation shaftless coal underground gasification method. The method comprises the steps of drilling work, well cementation work, gas extraction work, coal undergroundgasification work, combustion area treatment work, CO2 sealing work and the like. According to the poly-generation shaftless coal underground gasification method, the drilling work amount can be greatly reduced, based on the single-time drilling construction process, a drawing-injection integrated multi-purpose pipe assembly can be used for sequentially completing gas extraction work, coal underground gasification work, combustion area treatment work, gas sealing work and hole sealing work, the drilling utilization rate is greatly improved, and production cost is reduced while poly-generationcoal underground gasification work is achieved; and reutilization of underground waste space can be achieved, the defects that in the prior art, the drilling utilization rate is low and production cost are high can be effectively overcome, and the method is especially suitable for coal underground gasification work.

Description

technical field [0001] The invention relates to an underground coal gasification method, in particular to a polygeneration shaftless underground coal gasification method suitable for underground coal mines, and belongs to the technical field of coal resource development and utilization. Background technique [0002] Underground coal gasification is an exploratory underground in-situ fluidized mining process for coal. There are two types of underground gasification processes: well type and no well type. The gasification furnace can be used to recover coal resources that cannot be mined manually and are uneconomical. The well-less underground coal gasification is efficient and economical, realizes unmanned underground operation, and ensures the safety of the production process. However, due to the need to drill a large number of boreholes from the ground to the coal seam and penetrate, the amount of drilling work is large. And at present, a large number of boreholes are only...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/295E21B43/30E21B35/00E21B17/00
CPCE21B17/00E21B35/00E21B43/295E21B43/305
Inventor 戚绪尧陈良舟李亚稳杜阳辛海会姬有仓白成武
Owner CHINA UNIV OF MINING & TECH
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