Coalbed methane production shows wide range of variability

Dean E. Gaddy Drilling Editor This well, located in the "fairway" of the San Juan basin, northern New Mexico, just finished a procedure in which the pipe rams were shut-in to pressurize the coal seams. After a period of time, the rams are opened and the pressure is vented through the blooie line at surface. This process of cavitation creates an underground chamber that expands the contact of the cleat system with the well bore, increasing its near well-bore permeability (Fig. 3). As compared to conventional gas plays, the production distribution of coalbed methane (CBM) shows a wide range of variability that can mislead development strategies. "That's...

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