Method of displacing fluids within a gas-condensate reservoir
First Claim
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1. A method of displacing reservoir fluids through a subterranean retrograde or gas-condensate reservoir, comprising:
- introducing a displacement fluid into the reservoir and displacing it and the reservoir fluids through the reservoir;
wherein the displacement fluid is inherently miscible with the reservoir fluids at the temperature and pressure of the reservoir; and
further wherein the displacement fluid comprises a nonoxidizing gas selected from the group consisting of carbon dioxide, flue gas, nitrogen, residue gas, and mixtures thereof.
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Abstract
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.
22 Citations
12 Claims
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1. A method of displacing reservoir fluids through a subterranean retrograde or gas-condensate reservoir, comprising:
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introducing a displacement fluid into the reservoir and displacing it and the reservoir fluids through the reservoir; wherein the displacement fluid is inherently miscible with the reservoir fluids at the temperature and pressure of the reservoir; and further wherein the displacement fluid comprises a nonoxidizing gas selected from the group consisting of carbon dioxide, flue gas, nitrogen, residue gas, and mixtures thereof. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of inhibiting in-situ condensation of reservoir fluids in a retrograde or gas condensate reservoir, comprising:
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injecting a displacement fluid inherently miscible with the reservoir fluids at the temperature and pressure of the reservoir, in an amount sufficient to maintain the reservoir pressure above the original dew point of the reservoir fluids, the displacement fluid comprising a nonoxidizing gas selected from the group consisting of carbon dioxide, flue gas, nitrogen, residue gas, and mixtures thereof, and introducing a drive slug of the nonoxidizing gas used in the displacement fluid. - View Dependent Claims (8, 9)
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10. A method of reversing in-situ condensation of reservoir fluids in a retrograde or gas condensate reservoir wherein the reservoir pressure is below the dew point of the original reservoir fluids, comprising:
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injecting a displacement fluid inherently miscible with the reservoir fluids at the temperature and pressure of the reservoir in an amount sufficient to maintain the reservoir pressure at or above the dew point of the reservoir retrograde fluids, and mixtures of the displacing gas and the retrograde fluids, the displacement fluid comprising a nonoxidizing gas selected from the group consisting of carbon dioxide, flue gas, nitrogen, residue gas, and mixtures thereof, and introducing a drive slug of the nonoxidizing gas used in the displacement fluid. - View Dependent Claims (11, 12)
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Specification