Wells – Processes – Distinct – separate injection and producing wells
Patent
1986-09-18
1988-05-24
Suchfield, George A.
Wells
Processes
Distinct, separate injection and producing wells
166294, E21B 4322, E21B 33138
Patent
active
047459760
ABSTRACT:
A method for selectively plugging the more permeable regions of an underground formation having non-uniform permeability wherein a first surfactant solution is injected into the formation in an amount effective to contact a substantial portion of the surface area of the highly permeable regions of the formation, which first surfactant solution is characterized as having a selected chromatographic velocity and as being capable of reversibly adsorbing onto the surface of the pores of the formation.
After injecting the first surfactant solution, a water-soluble spacer fluid is injected in an amount sufficient to place the first surfactant solution a selected distant into the formation, the spacer fluid being characterized as having a pre-injection viscosity about equal to the first surfactant solution.
After injecting the space fluid, a second surfactant solution is injected in an amount about equal to the amount of the first surfactant solution, and characterized as having a pre-injection viscosity about equal to the first surfactant solution and the spacer fluid, and as having a selected chromatographic velocity which is higher than the chromatographic velocity of the first surfactant solution, and has having a composition such that it will be capable of interacting physically with the first surfactant solution to produce a phase change so that the product of such interaction is capable of at least partially plugging the pores of the formation in which such product is placed.
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Harwell Jeffrey H.
Scamehorn John F.
Board of Regents for the University of Oklahoma
Suchfield George A.
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