Low permeability coal seams, especially if they contain CO2, are difficult to drain sufficiently using in-seam drainage holes. Sand propped hydraulic fractures have been shown to be effective in stimulating drainage boreholes, allowing sufficient gas content reduction to occur to allow mining. SCT has partnered with CSIRO on several projects that demonstrated the effectiveness of sand propped fractures. CSIRO’s Sand Adder provides a method of adding proppant sand on the upstream side of a high pressure pump, allowing a normal explosion proof longwall support pump to be used as a hydraulic fracturing pump. SCT offers in situ stress measurement and hydraulic fracture design advice in this area.

For more information on stimulation of gas drainage boreholes, please contact Dr Ken Mills or Rob Jeffrey.

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