Secondary recovery process

Wells – Processes – Distinct – separate injection and producing wells

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Details

166307, 252 855C, E21B 4327

Patent

active

042102057

ABSTRACT:
Significant improvement in the recovery of hydrocarbons from a subterranean hydrocarbon-bearing calcareous formation is accomplished by injecting into the formation via an injection well drilled into a formation communicating with an adjacent producing well and containing acid-soluble components which may or may not have water-sensitive clays and shales included therein, a composition comprising an aqueous solution of a mineral acid having dissolved therein a small amount of a vinylpyrrolidone terpolymer solution whereupon the acid solution reacts with the acid-soluble components of the formation creating passageways or enlarging existing passageways thus facilitating the flow of fluids therein and thereby increasing the recovery of hydrocarbons from the formation through the adjacent producing well. Optionally, the injected composition may be saturated with natural gas at the injection pressure.

REFERENCES:
patent: 2596137 (1952-05-01), Fast
patent: 3679000 (1972-07-01), Kaufman
patent: 3749169 (1973-07-01), Tate
patent: 3791446 (1974-02-01), Tate
patent: 3916994 (1975-11-01), Maddox et al.
patent: 3923666 (1975-12-01), Dill

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