Directional long drilling construction method and large-area regionalization arrangement method for broken, soft and complex-structure coal seam
A construction method and long drilling technology, which are applied in the field of gas drainage in complex coal seams with crushed and soft structures, can solve the problems of high construction cost of rock roadway, inability to realize large-area regionalized efficient drainage, short drilling coverage and short service time, etc. problem, to achieve the effect of efficient extraction
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[0038] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0039] This embodiment includes coal seams with soft and complex structures (such as figure 1 ) of directional long borehole design, construction and long borehole regional layout.
[0040] (1) For the design and construction of a single group of directional long boreholes, a complete set of long borehole construction methods of "direction detection - pressure relief and antireflection - large diameter protective holes" shall be adopted.
[0041] Drilling design aspects:
[0042] A single group of boreholes ...
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