Oil recovery by improved surfactant flooding

Details Oil recovery by improved surfactant flooding Oil recovery by improved surfactant flooding

1975-02-27

1977-01-25

Purser, Ernest R.

Wells

Processes

Distinct, separate injection and producing wells

E21B 4316

Patent

active

040046370

ABSTRACT:
The quantity of oil which can be economically recovered from an already waterflooded predominantly oil-wet formation is increased by passing a first solution through the formation to change the formation from its oil-wet to a water-wet state, passing a second solution having high interfacial tension with the oil through the formation to force the oil from the small pores of the formation into larger ones, and passing a third solution having a low interfacial tension between the third solution and the oil through the formation, optionally passing a mobility buffer-solution through the formation to prevent fingering or channeling, and finally passing the driving fluid through the formation.

REFERENCES:
patent: 3258072 (1966-06-01), Froning
patent: 3414053 (1968-12-01), Treiber et al.
patent: 3437140 (1969-04-01), Foster et al.
patent: 3437141 (1969-04-01), Brandner
patent: 3467187 (1969-09-01), Gogarty et al.
patent: 3467190 (1969-09-01), Dunlap et al.
patent: 3474864 (1969-10-01), Hurd
patent: 3480080 (1969-11-01), Murphy
patent: 3605894 (1971-09-01), Jones
patent: 3648773 (1972-03-01), Gogarty
patent: 3698479 (1972-10-01), Askew et al.
Wagner et al, "Improving Oil Displacement Efficiency By Wettability Adjustment", Petroleum Transactions, Aime, vol. 216, 1959, pp. 65-72.

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