Large-temperature-difference freeze-thaw cycle method for production increase of surface borehole
A surface drilling and freeze-thaw cycle technology, which is applied in earthwork drilling, wellbore/well components, gas discharge, etc., can solve problems such as unsatisfactory application effect, restricted gas drainage effect, and difficulty in forming long fractures. Achieve the effect of increasing cracking effect, improving cracking effect, and good cracking effect
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[0022] The present invention will be further described below.
[0023] Concrete steps of the present invention are:
[0024] A. When the gas flow in the gas drainage pipe is greatly reduced to 8m 3 , open the first valve 9 and the second valve 13, start the magnetized water generator 14 and the pulsation pump 11, the magnetized water is pulsated by the pulsation pump 11 to obtain pulsating magnetized water, and the pulsating magnetized water passes through the third pipeline 12, the second pipeline The pipeline 10 and the first pipeline 4 enter the gas drainage pipe 3, and the gas drainage pipe 3 is cleaned and impacted on the coal seam 1, so that the cracks in the coal body develop and expand, and the pulsation frequency of the pulsating magnetized water is controlled to be 0.05 Hz to 0.3 Hz. The pulsation pressure is 12MPa~18MPa, and the pulsation time is 30min~45min;
[0025] B. After the injection of the pulsating magnetized water is completed, close the magnetized water...
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