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Mining method for deformed coal coalbed methane for V-shaped well bottom plate auxiliary layer

A technology for auxiliary layer and tectonic coal, which is applied in the fields of mining fluids, drilling equipment and methods, mining equipment, etc., can solve the problems of poor fracturing effect, pollution, and low production of coalbed methane in tectonic coal, so as to improve production and fracturing. Good effect, the effect of controlling large reserves in a single well

Inactive Publication Date: 2015-07-08
CNPC GREATWALL DRILLING ENG
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Problems solved by technology

It overcomes the disadvantages of poor fracturing effect of existing structural coal bed methane mining methods, which are easy to cause pollution, coal seam water cannot be completely discharged, and low output of structural coal bed methane

Method used

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  • Mining method for deformed coal coalbed methane for V-shaped well bottom plate auxiliary layer

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Embodiment Construction

[0014] Such as figure 1 Shown, a kind of method for mining structural coal seam gas in the auxiliary layer of V-shaped well floor, the method steps are as follows: 1. Well location deployment: For structural coal seam gas fields, implement V-shaped wells, that is, the far ends of two horizontal wells 1 and the same One vertical well 2 is docked, and two horizontal wells 1 are arranged in the brittle sandstone or siltstone brittle rock formation 8-15m below the coal bottom; the positional relationship of the three wells on the plane: the positional relationship of the three wells on the plane should take into account the overall structure Due to factors such as height, ground stress, etc., in order to facilitate drainage, the vertical well 2 is arranged at a low position, and the angle between the well axes of the two horizontal wells 1 is between 90-180°, and the bisector of the angle is as close as possible to the maximum principal stress direction 3 Parallel in order to maxi...

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Abstract

The invention relates to a mining technical field for deformed coal coalbed methane, and in particular relates to a mining method for deformed coal coalbed methane for V-shaped well bottom plate auxiliary layer. The method comprises the following steps: 1, deploying well position; 2, drilling a vertical shaft; 3, drilling a horizontal well; 4, fixing well via horizontal section; 5, staged fracturing; 6, secondary abutting joint; 7, producing in a pump. The mining method for deformed coal coalbed methane for V-shaped well bottom plate auxiliary layer is good in fracturing effect, and big in single well control storage amount, the coalbed methane seepage passage from the coal bed to the auxiliary layer can be established, no pollution is generated, the water in the coal bed can be completely discharged, and the deformed coal coalbed methane yield is greatly improved. The mining method for deformed coal coalbed methane for V-shaped well bottom plate auxiliary layer overcomes the defects of the existing deformed coal coalbed methane mining method that the fracturing effect is poor, the pollution is easily generated, the water in the coal bed cannot be discharged completely and the deformed coal coalbed methane yield is low.

Description

Technical field: [0001] The invention relates to the technical field of mining structural coal bed methane, in particular to a method for mining structural coal bed methane from an auxiliary layer on the floor of a V-shape well. Background technique: [0002] The development of coalbed methane by surface drilling has achieved good results in many primary structural coal areas. For structural coal development areas with broken coal quality, hydraulic fracturing stress cannot be effectively transmitted in plastic coal quality due to defects in coal body structure. All hydraulic fracturing of vertical wells carried out since the 1980s has not achieved substantial breakthroughs. In recent years, the company has done some research and attempts: such as drilling U-shaped wells in coal seams and segmental fracturing technology, this technology is more suitable for primary structural coal, but not suitable for structural coal, because the horizontal section is located in the coal se...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/30E21B43/12E21B7/20E21B7/04E21B33/13E21F7/00
CPCE21B43/006E21B7/04E21B7/20E21B33/13E21B43/12E21B43/26E21B43/305
Inventor 张冲王作雷赵春旭孙晓东刘洋张磊李红阳白润飞王艺璇
Owner CNPC GREATWALL DRILLING ENG
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