Coal Seam Gas (CSG)

COAL SEAM GAS (CSG)

characteristics

Coal Seam Gas (CSG) and Coal Bed Methane (CBM) drilling applications focus on dewatering coal seams to release methane gas. They start with a low gas-water ratio which increases over time as water is removed from the depressurized reservoir. Initial operation requires continuously producing water at low bottom hole pressures until gas rates increase.

Challenge

Abrasive production and stick-slip in a low lubrication environment is challenging and requires proper elastomer and fit selection. Consistent flow is required to promote gas production (escape) from the reservoir.

SOLUTIONS

PUMPS

Progressing Cavity Pumps’ simplicity, ability to handle coal fines, and require very little maintenance make them the system of choice. They also produce a wide range of rates with a non-pulsating flow. It is critical to keep these wells pumped off to maintain a low bottom hole pressure and allow the gas to escape the formation.

Lifting Solutions manufactures many low-volume small-form factor PCPs specifically for CSG/CBM applications. Rotor and stator fit are critical to ensure pump operation in an environment void of lubrication pumping mostly water at low viscosity (1cp) with coal fines. Lifting Solutions uses specialized sizing tools to determine the best rotor size for the applications based on elastomer and fluid characteristics.

ELASTOMER

MN1 elastomer is the best choice in high water cut applications due to its mechanical properties, low water swell and excellent hot water bond integrity.