Oil recovery by waterflooding with improved mobility control

Details Oil recovery by waterflooding with improved mobility control Oil recovery by waterflooding with improved mobility control

1974-11-07

1977-04-19

Purser, Ernest R.

Wells

Processes

Distinct, separate injection and producing wells

166252, E21B 4325

Patent

active

040182819

ABSTRACT:
Waterflooding employing the use of an initial mobility control slug which is graded at its front end by progressively increasing its viscosity and a terminal mobility control slug which is graded at its back end by progressively decreasing its viscosity. An intermediate mobility control slug of substantially constant viscosity may be injected between the initial and terminal slugs. The invention may be carried out in conjunction with surfactant or alkaline waterflooding.

REFERENCES:
patent: 3261399 (1966-07-01), Coppel
patent: 3330343 (1967-07-01), Tosch et al.
patent: 3330344 (1967-07-01), Reisberg
patent: 3437141 (1969-04-01), Brandner et al.
patent: 3467187 (1969-09-01), Gogarty et al.
patent: 3557872 (1971-01-01), Wood
patent: 3670818 (1972-06-01), Knight
patent: 3670819 (1972-06-01), Dauben et al.
Slobod et al., "Use of a Gaded Viscosity Zone to Reduce Fingering in Miscible Phase Displacements", Producers Monthly, Aug. 1960, pp. 12-19.

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