Gas drainage has been performed in advance of coal mining for commercial production of gas and to reduce levels of gas to safe or regulatory levels required for coal mining. Inadequate pre-drainage can lead to higher levels of gas than may be adequately managed by ventilation systems, potential pressure scenarios, or even outbursts, any of which can affect mine safety and economics. Thus, it may be desirable to more rapidly depressurise the coal seam based on mine safety and production scheduling, currently requiring either stimulation of the coal or additional drilling of pre-drainage wells and potentially jeopardising project economics.
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