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Underground gasification well cementing method and well structure

A technology of underground gasification and well structure, applied in the direction of coal gasification, underground mining, drilling equipment and methods, etc., can solve problems such as casing fracture

Active Publication Date: 2015-04-29
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned patents have no effect on casing fracture caused by stratum dislocation (non-up-and-down dislocation)

Method used

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  • Underground gasification well cementing method and well structure
  • Underground gasification well cementing method and well structure
  • Underground gasification well cementing method and well structure

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Embodiment Construction

[0021] Embodiments of the present invention are described below with reference to the drawings.

[0022] see figure 1 In this embodiment, an embodiment of the underground gasification cementing method of the present invention is provided, which is used for the gasification of underground coal seams.

[0023] In the method of this embodiment, during the construction process of the well 2 leading into the coal seam 1 from the ground, or after the construction is completed, the following step of setting the cementing casing 3 is performed: the cementing casing 3 is lowered into the well 2 until the cementing casing 3 is set. The bottom end of the well casing 3 enters the coal seam 1 to a set depth and stops, and the cementing casing 3 is connected to the well wall of the well 2 . Wherein, the cementing casing 3 at least includes a telescopic flexible casing 31, the bottom end of the telescopic flexible casing 31 constitutes the bottom end of the cementing casing 3, and the lengt...

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Abstract

The invention relates to an underground gasification well cementing method and a well structure. The method comprises the following steps: descending a well-cementing sleeve into a well, stopping descending the well-cementing sleeve until the bottom end of the well-cementing sleeve enters into a coal seam for a set depth, and connecting the well-cementing sleeve with the well wall of the well, wherein the well-cementing sleeve at least comprises a flexible sleeve, the bottom end of the telescopic flexible sleeve forms a bottom end of the well-cementing sleeve, and the length of the telescopic flexible sleeve is greater than or equal to the sum of the maximum height of a water diversion fissure zone above the coal seam and the set depth. The well structure comprises a well which is communicated with the coal seam from the ground and the well-cementing sleeve, wherein the well-cementing sleeve is connected with the well wall of the well; the well-cementing sleeve comprises the telescopic flexible sleeve, the bottom end of the telescopic flexible sleeve is positioned at the set depth of the coal seam, and the length of the telescopic flexible sleeve is greater than or equal to the sum of the maximum height of the water diversion fissure zone above the coal seam and the set depth. The method and the well structure are capable of preventing well-cementing sleeve breakage caused by fissure of stratum above the coal seam in each direction.

Description

technical field [0001] The invention relates to the field of underground coal gasification, in particular to an underground gasification well cementing method and a well structure. Background technique [0002] In underground gasification, oilfield development, and coalbed methane exploitation, failure phenomena such as damage, corrosion, and fracture of cementing casings occur due to improper operation of cementing casings, changes in ground stress, and corrosion in harsh downhole environments. Among them, due to water injection fracturing, pressure increase, heating, goafing and other operations on the target layer, the stratum above the target layer is filled with liquid pressure and rises or loses support and sinks, causing the cementing casing to be squeezed and deformed. Even fracture, making the drilling can not be used normally. In underground coal gasification, due to factors such as the need to inject gasification agents into the underground coal seam, the combust...

Claims

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Application Information

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IPC IPC(8): E21B7/20E21B17/00
CPCE21B17/20E21B7/20E21B43/295
Inventor 陈峰潘霞
Owner ENN SCI & TECH DEV
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