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Underground coal gasification bored well body structure and construction method thereof

An underground gasification and well structure technology, which is applied in coal gasification, underground mining, earth-moving drilling and other directions, can solve the problem that the local coal seam cannot be gasified and burned, the gas outlet or ground pipeline is blocked, and the supply of gasification agent is not in place, etc. problems, to achieve the effect of being conducive to penetration, prolonging service life and reducing ash accumulation

Inactive Publication Date: 2012-05-23
WULANCHABU XINAO COAL AERIFICATION TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of underground coal gasification with this kind of structure design, due to the special geological structure conditions of the coal seam, problems such as the following will appear: the supply of gasification agent is not in place, and the difficulty of penetration is increased, so that the local coal seam cannot be gasified and burned; Accumulation of ash and slag at the bottom of the hole blocks the air outlet or the surface pipeline; a local liquid seal is formed at the bottom of the gas inlet and outlet, resulting in large fluctuations in system resistance

Method used

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  • Underground coal gasification bored well body structure and construction method thereof
  • Underground coal gasification bored well body structure and construction method thereof
  • Underground coal gasification bored well body structure and construction method thereof

Examples

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example 1

[0035] The depth of the hole is 500 meters below, the pre-gasification coal seam position is 484~495 meters, and the net coal thickness is 8 meters as an example to illustrate the implementation steps of the present invention:

[0036] Complete the drilling and coring construction with a depth of 500 meters in the open hole;

[0037] According to the coring results, it is determined that the lower end of the petroleum steel casing is 486 meters, and the lower end of the glass steel pipe is 492.5 meters;

[0038] Connect the 6.5-meter-long glass steel pipe to the petroleum steel casing, and use the screw connection method to lower the glass steel pipe to 486 meters underground;

[0039] Lower the oil steel casing to about 0.5 meters above the ground (install the ground pipe network);

[0040] Carry out post-drilling construction, cementing, through-hole completion, well logging, hydraulic testing, etc.

example 2

[0042] The depth of the hole is 480 meters below, the pre-gasification coal seam position is 470~478 meters, and the net coal thickness is 6 meters as an example to illustrate the implementation steps of the present invention:

[0043] Completed the drilling and coring construction with a depth of 480 meters in the open hole;

[0044]According to the coring results, it is determined that the lower end of the petroleum steel casing is 468 meters, and the lower end of the PE pipe is 475.5 meters;

[0045] Connect the 7.5-meter-long PE pipe to the petroleum steel casing, and use the screw connection method to lower the PE pipe to 475.5 meters underground;

[0046] Lower the oil steel casing to about 0.5 meters above the ground (install the ground pipe network);

[0047] Carry out post-drilling construction, cementing, through-hole completion, well logging, hydraulic testing, etc.

example 3

[0049] The depth of the hole is 580 meters below, the pre-gasification coal seam position is 570~578 meters, and the net coal thickness is 6 meters as an example to illustrate the implementation steps of the present invention:

[0050] Completed the drilling and coring construction with a depth of 580 meters in the open hole;

[0051] According to the coring results, it is determined that the lower end of the petroleum steel casing is 568 meters, and the lower end of the PVC pipe is 575.5 meters;

[0052] Connect the 7.5-meter-long PVC pipe to the petroleum steel casing, and use the screw connection method to lower the PVC pipe to 575.5 meters underground;

[0053] Lower the oil steel casing to about 0.5 meters above the ground (install the ground pipe network);

[0054] Carry out post-drilling construction, cementing, through-hole completion, well logging, hydraulic testing, etc.

[0055] According to the drilling well body structure and method thereof of the present invent...

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Abstract

The invention discloses a construction method for an underground coal gasification bored well body structure. The method is characterized by comprising the following steps of: boring a well hole at least extended from the ground to a coal bed; lowering a combustible sleeve with the predetermined length into the well hole; when the combustible sleeve is lowered to a predetermined position in the well hole, continuously lowering the combustible sleeve by means of another sleeve connected with the upper end of the combustible sleeve, so that the lower end of the combustible sleeve is positioned at a predetermined position in the coal bed; and fixing the combustible sleeve and the another sleeve in the well hole. The invention also provides the corresponding well body structure.

Description

technical field [0001] The invention relates to an underground coal gasification drilling well body structure and a construction method of the coal underground gasification drilling well body structure. Background technique [0002] Gasifier drilling in the underground coal gasification process includes two types of process wells: the inlet well and the gas outlet well. Whether the process drilling design is reasonable or not directly affects the selection and stable operation of the gasification process. It is the key to the stable production of underground coal gasification. and the key to low cost. In underground coal gasification production, the main function of the gas inlet and outlet wells is to send the gasification agent to the coal seam to be gasified through the inlet well, and the coal is burned and gasified in situ to produce coal gas and ash, and the coal gas is transported through the gas outlet well. Exported to the ground, the ash remains in the ground. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/295E21B43/30
Inventor 刘刚宋玉平庞旭林陈峰陈影
Owner WULANCHABU XINAO COAL AERIFICATION TECH