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Title: Mobilization and banking of residual oil in high salinity reservoir systems with the use of aqueous surfactant solutions of ethoxylated carboxymethylates

Abstract

Highly saline reservoir brine and crude oil with ethoxylated carboxymethylates and cosolvents show a complication phase behavior. The phase inversion temperature (PIT) has been investigated with respect to its ability to discern phase transformation in oil-brine-surfactant systems. PIT proved to be very sensitive to changes in salinity, ionic strength, water-oil ratio and surfactant concentration, which simultaneously are responsible for phase inversion of chemical systems in the porous medium. Viscosity measurements on the emulsion in a low shear viscosimeter demonstrated that the increase of viscosity of a water-in-oil emulsion can be attributed to the increase of the WOR. In displacement processes this may be provoked by viscous finering of the mobility buffer into the mobilized oil bank. The length and profile of the oil bank is controlled by phase conditions and viscous forces in the transition zone of the mobility buffer. By addition of a suitable alcohol as a cosolvent to the surfactant slug or to the mobility buffer the temperature range of the stable displacement process could be extended without loss of recovery efficiency and the pressure gradients observed during the flood were in the normal range.

Authors:
;
Publication Date:
OSTI Identifier:
6185253
Report Number(s):
CONF-820419-
Journal ID: CODEN: SEAPA
Resource Type:
Conference
Journal Name:
Soc. Pet. Eng. AIME, Pap.; (United States)
Additional Journal Information:
Conference: Enhanced oil recovery symposium, Tulsa, OK, USA, 4 Apr 1982
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; BRINES; PHASE STUDIES; OIL WELLS; MICROEMULSION FLOODING; PETROLEUM; SURFACTANTS; ALCOHOLS; DRILL CORES; ENHANCED RECOVERY; VISCOSITY; ENERGY SOURCES; FLUID INJECTION; FOSSIL FUELS; FUELS; HYDROXY COMPOUNDS; MISCIBLE-PHASE DISPLACEMENT; ORGANIC COMPOUNDS; RECOVERY; WELLS; 020300* - Petroleum- Drilling & Production

Citation Formats

Kraft, H R, and Pusch, G. Mobilization and banking of residual oil in high salinity reservoir systems with the use of aqueous surfactant solutions of ethoxylated carboxymethylates. United States: N. p., 1982. Web.
Kraft, H R, & Pusch, G. Mobilization and banking of residual oil in high salinity reservoir systems with the use of aqueous surfactant solutions of ethoxylated carboxymethylates. United States.
Kraft, H R, and Pusch, G. 1982. "Mobilization and banking of residual oil in high salinity reservoir systems with the use of aqueous surfactant solutions of ethoxylated carboxymethylates". United States.
@article{osti_6185253,
title = {Mobilization and banking of residual oil in high salinity reservoir systems with the use of aqueous surfactant solutions of ethoxylated carboxymethylates},
author = {Kraft, H R and Pusch, G},
abstractNote = {Highly saline reservoir brine and crude oil with ethoxylated carboxymethylates and cosolvents show a complication phase behavior. The phase inversion temperature (PIT) has been investigated with respect to its ability to discern phase transformation in oil-brine-surfactant systems. PIT proved to be very sensitive to changes in salinity, ionic strength, water-oil ratio and surfactant concentration, which simultaneously are responsible for phase inversion of chemical systems in the porous medium. Viscosity measurements on the emulsion in a low shear viscosimeter demonstrated that the increase of viscosity of a water-in-oil emulsion can be attributed to the increase of the WOR. In displacement processes this may be provoked by viscous finering of the mobility buffer into the mobilized oil bank. The length and profile of the oil bank is controlled by phase conditions and viscous forces in the transition zone of the mobility buffer. By addition of a suitable alcohol as a cosolvent to the surfactant slug or to the mobility buffer the temperature range of the stable displacement process could be extended without loss of recovery efficiency and the pressure gradients observed during the flood were in the normal range.},
doi = {},
url = {https://www.osti.gov/biblio/6185253}, journal = {Soc. Pet. Eng. AIME, Pap.; (United States)},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {1}
}

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