Mining or in situ disintegration of hard material – Processes – Breaking down by direct contact with fluid
Patent
1991-08-02
1992-09-15
Bagnell, David J.
Mining or in situ disintegration of hard material
Processes
Breaking down by direct contact with fluid
166308, E21B 4326, E21C 3714
Patent
active
051471116
ABSTRACT:
A cavity induced stimulation method for improving the initial production of fluids, e.g. methane, from a coal seam. A well is drilled and completed into the seam. A tubing string is run into the hole and liquid CO.sub.2 is pumped down tubing while a backpressure is maintained on the well annulus. Pumping is stopped and the pressure is allowed to build until it reaches a desired elevated pressure (e.g. 1500 to 2000 psia). The pressure is then quickly released. The sudden release of pressure plus other factors cause the coal to fail and fragment into particles. The particles are removed to form a cavity in the seam. The above steps may be repeated until the desired cavitation is achieved.
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Atlantic Richfield Company
Bagnell David J.
Faulconer Drude
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