Wells – Valves – closures or changeable restrictors
Patent
1977-06-16
1978-09-26
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
E21B 4300
Patent
active
041162765
ABSTRACT:
A method of increasing the recovery of natural gas from a geo-pressured aquifer having a structural high or other "trap" from which gas or other fluids cannot escape upward and containing water and gas in solution in the water. The method includes producing water, from one or more wells extending from the surface and completed in the geo-pressured aquifer at a point below and spaced from and remote from the trap, by reservoir pressure at a high enough rate of production to reduce the existing pressure of the aquifer to allow a portion of the gas in solution to be released from the water whereby some of the released gas will migrate upward to form or increase any free-gas phase existing in the trap. Thereafter, gas is produced from one or more wells extending from the surface to the free-gas phase in the trap. Furthermore, the production of water is continued from the one or more wells extending from the surface and completed in said geo-pressured aquifer at a point below and spaced from the trap while producing gas from the trap. In the event that a free-gas phase is dispersed in the water, a portion of the free-gas phase will expand and migrate and some of the expanded gas will migrate more freely to the down structure wells and be produced and some of the expanded free-gas phase will migrate upward to the trap and be produced from the wells completed in the trap.
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Cook, Jr. Harold L.
Geer Ernest C.
Katz Donald L.
Novosad Stephen J.
Transco Energy Company
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