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212 showed a strong relationship between production and the orientation of the fracture relative to the lens. A massive fracture perpendicular to the lens can have an effective half-length of only one half of the width of the lens, while one parallel t o the lens may be effective for its full distance. Thus, an expected, effective fracture length must be computed. The general assumption is that the fracture azimuth and the orientation of the lens are randomly related because each is controlled by factors from different geologic periods.
Bituminous and subbituminous coalfields of the conterminous United States (from Wise, 1979). 24 V. Kuuskraa WATER SEPARATOR COMPRESSOR JMPE T O M A I N DEWATERING PUMP & L I N E 1000-FT COAL WELL- SEAM BORES 6 GAS/WATER Fig. 12. Horizontal borehole from a vent shaft. Recovery of gas from unminable coal seams requires that the wellbore be in communication with the total natural fracture system in the well drainage area. Using vertical wellbores with stimulated fractures does not appear to be a technically viable option except in unique settings.
12. Horizontal borehole from a vent shaft. Recovery of gas from unminable coal seams requires that the wellbore be in communication with the total natural fracture system in the well drainage area. Using vertical wellbores with stimulated fractures does not appear to be a technically viable option except in unique settings. The induced fracture will tend to parallel the face cleats rather than intersect them, providing only limited connection with the natural fracture system. Deviated wells appear to provide a technically feasible means for exploiting the deeply buried, unminable coal (Fig.