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Underground gasification furnace

A technology of underground gasification and gasification channels, which is applied in the direction of coal gasification, underground mining, mining fluids, etc., can solve the problems of poor oblique impact force and increased cementing cost, and achieve the goal of reducing impact, deformation or damage effect of possibility

Active Publication Date: 2015-04-29
ENN SCI & TECH DEV
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

Among them, multi-layer casing cementing requires 2 to 3 times the original amount of cementing casing, which greatly increases the cost of cementing, while the two-stage casing cementing with internal and external slidable connections can only deal with problems caused by stratum dislocations. The stress change caused by the movement has no good response to the oblique impact force that may be generated by the caving and subsidence of the strata.

Method used

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Embodiment Construction

[0020] Embodiments of the present invention are described below with reference to the drawings.

[0021] refer to figure 1 and figure 2 , an embodiment of the underground gasification furnace of the present invention, comprising a gasification channel 11 and at least one process well provided with a cementing casing, the process well is located on one side of the gasification channel and includes a manufacturing well extending toward the gasification channel 11 The deviated well section 32, the bottom of the deflected well section 32 constitutes the bottom of the process well. Wherein, the gasification channel 11 is located in the coal seam. In the projection of the process well and the gasification channel on the horizontal plane, the projection of the process well is located on one side of the projection of the gasification channel, that is, the process well is located on one side of the gasification channel. The horizontal plane mentioned in this embodiment is a plane p...

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Abstract

The invention relates to an underground gasification furnace which comprises a gasification passage (11) and at least one technological well, wherein the technological well is provided with a well-cementing sleeve, is positioned at one side of the gasification passage (11) and comprises a kick-off section (32); the kick-off section (32) extends towards the gasification passage (11); the bottom end of the kick-off section (32) forms a bottom end of the technological well. The underground gasification furnace is capable of effectively reducing the possibility that the well-cementing sleeve of the technological well is deformed or damaged by stratum diastrophism.

Description

technical field [0001] The invention relates to an underground gasification furnace. Background technique [0002] In the drilling of oil and natural gas, due to fracturing, the formation uplifts or falls, and this change in formation stress will squeeze or tear the cementing casing. [0003] In the process of underground coal gasification or after gasification, because the coal seam is gasified to form a goaf, the roof of the coal seam and the rock strata above will collapse or collapse locally without support. The stratum dislocation caused by this caving or collapse will squeeze The cementing casing of the vertical well of the coal underground gasifier, or the above-mentioned caving or collapse makes the lower part of the cementing casing lose support, and the impact of the caving layer makes the casing easy to break and fall. [0004] Specifically, the existing underground gasification well structure usually includes vertical wells and directional horizontal wells. Dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/295
CPCE21B43/295E21B43/305
Inventor 陈峰潘霞
Owner ENN SCI & TECH DEV
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