The Analysis of Key Issues for Virtual Reservoirs Application in Coalbed Methane Development

概要

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Based on flow state of coalbed methane (CBM) migration, coal reservoir broadly is divided intooutburst and non-outburst coal. Because of strong water sensitivity and poor hydraulic fracturingeffect of outburst coal, hydraulic fracturing measures to increase permeability which used to beapplied in non-outburst coal do not suitable for outburst coal. Coal floor is selected as virtual reservoirfor roof maintenance when mining coal, Depending on a zero radius drilling and high-energy gasloose blasting technology, the reservoir and the coal floor become transfixion, so that the CBMdiffuse to the floor cracks, and then migrate into the wellbore. The "highway" of CBM migration isbuilt through virtual reservoir, which would be expected to break through the forbidden zone oftraditional CBM development, and joint two-energy exploitation of coal and CBM can achieve, sothat gas disaster and greenhouse gas emission will reduce greatly. Therefore, virtual reservoir hasbroad application prospect.