Method of removing gas from an underground seam

Details Method of removing gas from an underground seam Method of removing gas from an underground seam

E - Fixed Constructions

21

B

166/32

E21B 43/20 (2006.01)

Patent

CA 1202882

ABSTRACT OF THE INVENTION An improved method of removing gas from an underground seam, such as a coal seam, between adjacent strata, involving (1) forcing pressurized fluid into a borehole at an initial low rate and gradually increasing the rate to a final treatment rate such that a bottom borehole pressure is achieved which will selectively fracture the seam as compared to adjacent strata in a manner that produces a vertically confined fracture zone, and (2) adding proppant to the pressurized fluid being forced into said borehole in a controlled manner in order to prevent proppant flowing back into the borehole on removal of the pressurized fluid.

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