How do gas companies extract natural gas from a coal seam?
Since CBNG travels with ground water in coal seams, extraction of CBNG involves pumping available water from the seam in order to reduce the water pressure that holds gas in the seam. CBNG has very low solubility in water and readily separates as pressure decreases, allowing it to be piped out of the well separately from the water. Water moving from the coal seam to the well bore encourages gas migration toward the well.
