Title: Process of displacing oil in subterranean reservoir employing aqueous surfactant systems

Abstract: In an aqueous anionic surfactant system, the multivalent cation tolerance is improved by the presence of both a solute which inhibits crystal growth and a solute which forms crystalline precipitates of multivalent cations.

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Inventors: Chiu, Ying C. (Houston, TX, US)

Application Number: 489307
Filing Date: 1974-07-17
Publication_date: 1976-03-09
Assignee: Shell Oil Company (Houston, TX)
Primary Class(es): 507/236 166/270.1, 166/275, 507/259, 507/263, 507/927, 507/936
Other Classes:
US Patent Ref:

3258071	Jun, 1966	Shen	252/8.
3303879	Feb, 1967	Williams	166/275.
3330344	Jul, 1967	Reisberg	166/275.
3336221	Aug, 1967	Ralston	252/8.
3368978	Feb, 1968	Irant	252/545.
3481869	Dec, 1969	Jones	252/181.
3498379	Mar, 1970	Murphy	166/275.
3823774	Jul, 1974	Chiu	166/275.

Other Refs:
Primary Examiner: Guynn, Herbert B.
Assistant Examiner:
Attorney: