Amoco Corporation

The Standard Oil Company

Robert S Metcalfe

Miller Sheffield

James W Calvin

Rajen Puri

Dan Yee

Joseph J Chaback

A method of recovering methane from a solid carbonaceous subterranean formation by injecting a fluid that desorbs methane through at least one injection well into a subterranean formation and recovering desorbed methane through at least one production well. The initial rate of injection of the desorbing fluid can be increased without exceeding formation pressure limitations by injecting a preflush fluid having a desorbing efficiency less than a desorbing efficiency of the first fluid. This increase in injection of the desorbing fluid results in an increase in the recovery rate of methane.

Recovery of methane from solid carbonaceous subterranean formations

A method is disclosed of displacing reservoir fluids through a subterranean retrograde or gas-condensate reservoir wherein a displacement fluid is introduced into the reservoir and it is displaced along with the reservoir fluids through the reservoir. The displacement fluid can be inherently miscible with the reservoir fluids at the temperture and pressure of the reservoir and comprises a nonoxidizing gas selected from a group consisting of carbon dioxide, flue gas, nitrogen, residue gas, and mixtures thereof in selected proportions.

Method of displacing fluids within a gas-condensate reservoir

A method is disclosed for the displacing reservoir fluids, such as a rich gas, through a subterranean reservoir, such as a gas-condensate reservoir, wherein a displacement fluid is introduced into a reservoir and it is displaced along with the reservoir fluids through the reservoir. The displacement fluid develops in situ miscibility with the reservoir fluids at the temperature and pressure of the reservoir and comprises a nonoxidizing gas and fluids produced from the reservoir. The nonoxidizing fluid can be selected from a group consisting of carbon dioxide, flue gas, nitrogen, and combinations of these, and the fluids produced from the reservoir are in the form of dry hydrocarbon gas.

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Tulsa, OK, United States of America

Robert S Metcalfe