Wells – Processes – With indicating – testing – measuring or locating
Patent
1982-08-17
1984-09-25
Suchfield, George A.
Wells
Processes
With indicating, testing, measuring or locating
166273, 166274, E21B 4322, E21B 4700
Patent
active
044731167
ABSTRACT:
The sodium chloride equivalency of brine from a subterranean oil bearing reservoir is determined by equilibrating said brine with a known surfactant system and a standard hydrocarbon to give a multiphase system which is compared with known phase volume diagrams using the same ingredients at various sodium chloride concentrations to determine the salinity of the known systems at which the relative volumes correspond to those of the unknown system, this being the sodium chloride equivalency number of the unknown system. The above procedure can be used to allow use of standardized phase volume diagrams to tailor a surfactant system for a particular reservoir even though the reservoir does not have pure sodium chloride as the brine. In a more specific embodiment, the above system can be used even if the sodium chloride equivalency of the reservoir is quite high by utilizing as the cosurfactant an ethoxylated sulfated phenol and preparing a series of multiphase systems by equilibrating oil corresponding to that in the reservoir, a standard surfactant, and a series of ethoxylated sulfated phenol cosurfactants of varying degrees of ethoxylation, all at the brine concentration of the reservoir to determine a system having an optimum salinity (i.e., where the volume of oil and water in the microemulsion phase is about equal) which is relatively low, i.e., about 1 percent. Thereafter, additional samples are prepared at higher surfactant concentrations, all of the other ingredients being equal and the resulting systems are used to displace oil from a test core, the results applied so as to determine the cosurfactant concentration at which maximum oil recovery is obtained.
REFERENCES:
patent: 3493048 (1970-02-01), Jones
patent: 3885628 (1975-05-01), Reed et al.
patent: 3981361 (1976-09-01), Healy
patent: 4074755 (1978-02-01), Hill et al.
patent: 4079785 (1978-03-01), Hessert et al.
patent: 4122895 (1978-10-01), Sitton et al.
patent: 4125156 (1978-11-01), Glinsmann
patent: 4258789 (1981-03-01), Hedges et al.
patent: 4265308 (1981-05-01), Hedges et al.
patent: 4299711 (1981-11-01), Tyler et al.
patent: 4330148 (1982-05-01), Glinsmann et al.
Phillips Petroleum Company
Suchfield George A.
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