A method for stage-by-stage drainage of U-shaped wells for coalbed methane
A coalbed methane, U-shaped technology, applied in the fields of fluid extraction, earthwork drilling, wellbore/well components, etc., can solve the problems of unreasonable drainage system, poor gas production effect, unstable production, etc. The effect of bare area
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[0017] The present invention is aimed at the characteristics of the coal seam with a large dip angle, and uses the fracturing point of the U-shaped well as the key point of drainage control, and depressurizes step by step, and the specific process is as follows:
[0018] (1) The principle of gas production first in the remote butt joint horizontal well project. Since the horizontal section of the far-end docking well is generally drilled in the downhill manner, the coal seam section near the engineering well reaches the desorption condition first. If the coal seam dip angle is large, this phenomenon is more obvious.
[0019] (2) Three-stage drainage stage. The stage from the initial liquid level of the CBM well to the critical desorption pressure point is regarded as the first drainage stage; the liquid level from the critical desorption pressure point to the liquid level 20m above the roof of the target coal seam is regarded as the second drainage stage; subsequent drainage i...
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