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
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[0014] Such as figure 1 As shown, a V-shaped well floor auxiliary layer mining structured coal CBM method, the method steps are as follows: 1. Well location deployment: For a structured coal CBM field, implement a V-shaped well, that is, two horizontal wells 1 remote from the same One vertical well 2 butt, two horizontal wells 1 horizontal section is arranged in the sandstone or siltstone brittle rock 8-15m below the coal bottom; the position relationship of the three wells on the plane: the position relationship of the three wells on the plane should be considered as a whole In order to facilitate drainage, the vertical well 2 is arranged in the low position. The angle between the well axis directions 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 maximize the volume of fracture 4;
[0015] 2. Drilling straight wells: 40-50m deep pockets are left after dril...
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