Method for improving production of viscous crude oil
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United States of America Patent
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Jul 19, 1988
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app pub date -
May 8, 1987
filing date -
Oct 24, 1985
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Abstract
A method for improving the mobility and pipeline transport of a viscous crude oil by forming an oil-in-water emulsion with said oil and from 10 to 80% by weight of water in the presence of 100 to 1500 parts by weight of a surfactant blend per million parts by weight of said emulsion, said blend comprising from 15 to 85 parts by weight of an anionic or amphoteric surfactant (A) selected from those of the formulae Ar(OCH.sub.2 CH.sub.2).sub.n OSO.sub.3 H, ##STR1## a sodium and ammonium salt thereof, and from 85 to 15 parts by weight of a nonionic surfactant selected from (B) of the formula Ar(OCH.sub.2 CH.sub.2).sub.p OH or (C) of the formula ##STR2## the latter having an HLB value of from 10 to 20; where Ar is octylphenyl or nonylphenyl, n is 2 to 10, p is 10 to 100, a is 10 to 40, b is 15 to 55, c is 10 to 40, R.sup.1 is C.sub.8 to C.sub.18 alkyl and R.sup.2 is C.sub.12 to C.sub.18 alkyl; and said emulsion.
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