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Shaft coal uncovering method via radial technology

A technology of radial wells and vertical wells, which is applied in liquid/gas jet drilling, earthwork drilling, wellbore/well components, etc. It can solve the problems of tight construction period and long time for uncovering coal, so as to reduce engineering quantity and improve drainage Speed, the effect of reducing the risk of outstanding hazards

Inactive Publication Date: 2019-01-15
SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of long time and tight construction period in coal mine vertical shafts, it is necessary to adopt new technological measures to increase the air permeability of coal bodies, shorten the pre-pumping time of vertical shafts, and ensure rapid and safe coal seam exposure.

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  • Shaft coal uncovering method via radial technology

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Embodiment Construction

[0019] Radial well technology was first used in the petroleum industry, providing an economical and fast method for the exploitation of low-permeability and ultra-low-permeability oil and gas fields. Introducing radial well technology into the transformation of coalbed methane wells can achieve multiple purposes such as removing pollution near the well end, relieving stress concentration near the wellbore, communicating the original fractures of the coal seam and guiding fracturing, and then achieving the effect of single-well stimulation of coalbed methane wells.

[0020] The invention belongs to the use of coalbed methane wells around the vertical shaft to construct radial branches to the vertical shaft through ground drilling, and utilizes the guiding effect of the radial well to expand the influence range of fracturing cracks. In the rapid coal mining of vertical shafts in coal mines, the engineering quantity of underground drilling construction is reduced, which is extremel...

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Abstract

The invention relates to a shaft coal uncovering method via a radial technology, and belongs to the field of coalbed gas exploitation. A radio hole is constructed towards the shaft by well drilling inthe ground, directed fracturing is carried out by using a guiding effect of the radial hole, the extension range of a fractured crack is expanded to the largest degree, and the permeability of a coalbed surrounding the shaft is improved. In the construction process, the ground vertical hole is constructed within the range of 100m in the surrounding of the shaft, and the radial well is constructedtowards the shaft along the radial direction. Radial branches are constructed towards the shaft by using the existing ground hole, the fracturing technology is then combined, and the influential range of the fracturing crack is widened by using the guiding effect of the radial branches. The well is constructed, the radial well technology is efficiently combined with the fracturing technology andused for rapid coal uncovering in the shaft, the engineering amount of down-hole drilling is reduced, the coal mine gas extraction speed is improved greatly, coal uncovering time of the mine is shortened, the risk of danger is reduced, and rapid and safe coal uncovering is ensured.

Description

technical field [0001] The invention belongs to the field of coal bed gas exploitation, and in particular relates to a method for uncovering coal in vertical shafts using radial technology. Background technique [0002] China's coal seams are generally characterized by poor air permeability and low permeability, which leads to poor gas pre-extraction effects in surface drilling and underground drilling, and brings huge hidden dangers to coal mine construction and production. [0003] Coal and gas outburst is an extremely complex dynamic phenomenon that occurs in coal mine production. It can protrude a large amount of coal from the coal body to the roadway or stope in a very short period of time, and a large amount of gas gushes out, causing a very huge The dynamic effect is considered to be a geological disaster that seriously threatens the safe production of coal mines. Coal and gas outbursts in my country generally occur in coal seam side roads, coal uncovering in Shimen,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/30E21B7/18E21C41/18E21F7/00
CPCE21B7/18E21B43/26E21B43/30E21C41/18E21F7/00
Inventor 刘亮亮王越秦玉霞白杨张永成徐云张江华李德慧张为崔宇翔
Owner SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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