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Experience with methane control from horizontal boreholes.
Second International Mine Ventilation Congress, November 4-8, 1979, Reno, NV. P Mousset-Jones, ed., New York: American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc., 1980 Oct; :257-264
Methane drainage methods can be broadly classified as surface or underground. Surface methods make use of vertical and slant holes. The underground method discussed in the present paper involves horizontal drilling from shaft bottoms and from locations along the periphery of mines. Every foot of hole drilled in coal from underground locations is productive and gas flows increase as hole length increases. Therefore, underground techniques have a great potential for producing large-volume flows of methane. Pumps to dewater the horizontal holes are not necessary because gas pressure forces the water out of the hole. Methane can be recovered through the use of a simple inexpensive gas-water separator. Hydraulic fracturing, which has been used successfully to stimulate gas flows from vertical holes, has not proved practical in the case of horizontal holes.
Methanes; Methane-drainage; Methane-control; Gases; Underground-mining; Surface-mining; Mine-gases
Second International Mine Ventilation Congress, November 4-8, 1979, Reno, NV