Method for reducing permeability restriction near wellbore
First Claim
1. A method for increasing the productivity of a well producing from a gas reservoir in a formation in which retrograde condensation occurs near the well, comprising:
- (a) injecting a solution of an oil-wetting surfactant in a solvent into the well; and
(b) producing the solvent from the well.
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Abstract
Method is provided for increasing the productivity of gas wells producing from reservoirs where retrograde condensation occurs around the wells. An oil-wetting surfactant is injected in a solvent to oil wet the formation for a selected distance around a well or a hydraulic fracture intersecting the well. A pre-flush liquid, such as carbon dioxide, alcohol or similar products and mixtures thereof, may be used to reduce water saturation before injection of the surfactant. The method may also be applied to increase the productivity of oil wells producing from reservoirs where breakout of solution gas occurs near the well.
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Citations
13 Claims
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1. A method for increasing the productivity of a well producing from a gas reservoir in a formation in which retrograde condensation occurs near the well, comprising:
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(a) injecting a solution of an oil-wetting surfactant in a solvent into the well; and
(b) producing the solvent from the well. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification