Composition containing a polyvinylpyrrolidone and method for...

C - Chemistry – Metallurgy – 09 – K

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C09K 8/74 (2006.01) E21B 43/22 (2006.01)

Patent

CA 1061997

ABSTRACT OF THE DISCLOSURE The production of hydrocarbons from a subterranean hydrocarbon-bearing formation containing acid-soluble components, such as one containing clays or siliceaous minerals as exemplified by sandstone, shale, etc. is stimulated by injecting into the formation a composition comprising an aqueous solution of a mineral acid and a flourine-containing acid or salt and having dissolved therein a vinylpyrrolidone polymer. The in-depth increase in the permeability and porosity of the formation achieved utilizing the method of invention results in a substantial improvement in hydrocarbon recovery.

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