Method of stimulating gas-producing wells

Details Method of stimulating gas-producing wells Method of stimulating gas-producing wells

1993-11-09

1995-05-02

BUiz, Michael Powell

Wells

Processes

Producing the well

166256, E21B 4300

Patent

active

054110980

ABSTRACT:
Subterranean mineral seams, such as coal, which have been penetrated by gas production wells are stimulated to produce additional gas by placing a liquid, such as a solvent for coal, in the wellbore and in communication with a tubing extending within the wellbore and having a frangible shear disk assembly disposed therein. Pressure is increased inside the tubing string by pumping gas and/or liquid into the tubing string in sufficient quantity to cause the shear disk to release fluid pressure to act on the fluid in the open hole wellbore portion so that a substantial pressure pulse is exerted on the coal seam to effect rubblization of the coal to form a cavity and release entrapped or adsorbed gas for production up through the well. Imposition of rapid and cyclic pressure pulses on the coal seam at pressures up to 5000 psi above the in situ stress improves production of gas therefrom.

REFERENCES:
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patent: 4109719 (1978-08-01), Martin et al.
patent: 4245699 (1981-01-01), Steeman
patent: 4305464 (1981-12-01), Masszi
patent: 4422505 (1983-12-01), Collins
patent: 4683947 (1987-08-01), Fernbacher et al.
patent: 4995463 (1991-02-01), Kramm et al.
patent: 5147111 (1992-09-01), Montgomery
patent: 5199766 (1993-04-01), Montgomery
patent: 5297631 (1994-03-01), Gidson
SPE/DOE/GRI 12843 -"Cavity Stress Relief Method to Stimulate Demethanation Boreholes"; by A. K. Alain and G. M. Denes, 1984, Society of Petroleum Engineers.

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