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US 10,538,693 B2Granted
Stabilization of petroleum surfactants for enhancing oil recovery
AssigneeSaudi Arabian Oil Company
InventorYun Chang
Life of this patent
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Abstract
The present technology relates to compositions and related methods for stabilizing surfactants capable of increasing liquid hydrocarbon production from subterranean reservoirs. In some embodiments, the technology relates to the stabilization of sulfonate based surfactants for enhanced oil recovery (“EOR”) operations. In certain embodiments, the sulfonate based surfactants are characterized by increased thermal and chemical stability under crude oil recovery conditions.
Claims13
A modified petroleum sulfonate composition comprising:
- a petroleum sulfonate solution, where the petroleum sulfonate solution comprises linear alkyl benzene sulfonates and does not include internal olefin sulfonates;
- alcohol alkoxylate;
- polyvinylpyrrolidone, the polyvinylpyrrolidone having molecular weight of about 55,000, where the alcohol alkoxylate and polyvinylpyrrolidone are combined in a weight ratio of between about 1:1 to about 1:3.75;
- and
- a saline water fraction, where the modified petroleum sulfonate solution is stable under subterranean reservoir conditions for a period of at least about 37 days.
2 more elements
Dependencies are inferred from the claim text.