Method to reduce sulfonate loss in micellar flooding

Details Method to reduce sulfonate loss in micellar flooding Method to reduce sulfonate loss in micellar flooding

1983-03-24

1984-08-28

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166274, E21B 4322

Patent

active

044678690

ABSTRACT:
An improved method of oil recovery for use within an underground formation having an ion exchange capacity. An aqueous micellar fluid bank containing a surfactant is injected into the formation followed by an injection of the bank with a mobility control fluid, such as a polymer-thickened aqueous solution, into the formation. The mobility control fluid has a salt level lower than or equal to the salt level of the micellar fluid, but a greater divalent cation-to-monovalent cation ratio than the micellar fluid make-up brine, preconditioning brine or original in-place brine in a reservoir in order to reduce the hardness of the formation fluids in situ generated at the trailing edge of the micellar fluid which in turn reduces the surfactant loss from the micellar fluid.

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patent: 4262746 (1981-04-01), Hammett
Gupta et al. "Micellar Flooding-Compositional Effects on Oil Displacement", Society of Petroleum Engineers Journal.

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