Protected seam bottom plate upward comb-shaped drilled hole gas extraction method
A protected layer and gas drainage technology, applied in the direction of gas discharge, earth drilling, mining equipment, etc., can solve the problems of increasing the cost of extraction, affecting the mining efficiency and cycle, and the large amount of drilling engineering, so as to improve the gas consumption. Drainage efficiency, shorten the mining cycle, reduce the effect of construction costs
Active Publication Date: 2012-09-12
CHINA UNIV OF MINING & TECH
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The invention discloses a protected seam bottom plate upward comb-shaped drilled hole gas extraction method. The method comprises the following steps of: performing directional drilling on a protected seam bottom plate; after a drill is lifted, inserting a special packing deflecting device from a hole, and performing upward branch drilling by using a small-diameter large-bent angle hole bottom motor from inside to outside to form multiple groups of protected seam bottom plate upward comb-shaped drilled holes; and after all drilling construction is finished, sealing the holes, connecting a gas extraction pipeline and extracting gas. The method is used for extracting gas in a protective seam mining technology, and has the characteristic of one hole and multiple purposes; the gas of a protected seam can be pre-extracted before the protective seam is mined; after the protective seam is mined, the extraction of pressure-relief gas of the protected seam can be realized; and the construction cost is low, and a period is short.
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Property | Measurement | Unit |
Length | 8.0 ~ 15.0 | m |
tensile | MPa | |
Particle size | Pa | |
strength | 10 |
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