Wells – Processes – Distinct – separate injection and producing wells
Patent
1985-11-12
1987-05-05
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
166273, 166275, E21B 4322
Patent
active
046624457
ABSTRACT:
A method is disclosed for displacing hydrocarbon fluid within a subterranean formation by the introduction of an aqueous micellar fluid. In the method, the aqueous micellar fluid comprises a surfactant, from about 1 to about 30 wt. % sulfonate, and as the major constituent, water. The sulfonate further is comprised of a mixture of monosulfonate and disulfonate. At the start of the introduction of the aqueous micellar fluid, a monosulfonate-rich sulfonate mixture is utilized and at the end of the introduction, a disulfonate-rich mixture is utilized. Such grading or adjusting or mono- to disulfonates is used to increase the effectiveness of the micellar fluid and can occur throughout the introduction process either linearly or exponentially with respect to time, or in block slugs in the micellar fluid alone, a phase control fluid alone, or across both.
REFERENCES:
patent: 4537253 (1985-08-01), Morita et al.
patent: 4544033 (1985-10-01), Ukigai et al.
patent: 4549607 (1985-10-01), Morita et al.
patent: 4555351 (1985-11-01), Morita et al.
patent: 4556108 (1985-12-01), Morita et al.
Amoco Corporation
Brown Scott H.
Novosad Stephen J.
Odar Thomas J.
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