@inproceedings{480432c987cb4e10a44040913d534fe6,
title = "CT studies of surfactant-induced CO2 mobility control",
abstract = "Foam mobility control for CO2 was studied by Computerized pornography (CT) in tertiary first-contact miscible corefloods. The CT images show that injection of 0.05 wt% Neodol 25-12 Ethoxy Glycerol Sulfonate (NEGS 25-12S) in brine prevents gravity and viscous instabilities, and enables CO2 to displace all the oil from cores in a piston-like manner. Surfactant screening tests, designed to test the debilitating effect of temperature, salinity, and crude oils on foam performance, are described. NEGS is both temperature and salinity tolerant: it forms stable foams with CO2 in the presence of oil to at least 76 deg C with hard brines containing at least 18 wt% TDS. CT studies revealed a combination of factors contributing to effective CO2 mobility control. These include both increases in apparent CO2 viscosity and capillary pressure changes which produce a high-saturation brine bank insitu. This brine bank separating the CO2 and oil banks further reduces CO2 mobility through relative permeability effects but does not impair oil recovery efficiency by brineshielding mechanisms.",
author = "Wellington, {S. L.} and Vinegar, {H. J.}",
note = "Publisher Copyright: {\textcopyright} 2018 Society of Petroleum Engineers (SPE). All Rights Reserved.; 60th Annual Technical Conference and Exhibition of the Society of Petroleum Engineers 1985 ; Conference date: 22-09-1985 Through 26-09-1985",
year = "1985",
month = jan,
day = "1",
doi = "10.2523/14393-ms",
language = "English",
series = "Proceedings - SPE Annual Technical Conference and Exhibition",
publisher = "Society of Petroleum Engineers (SPE)",
booktitle = "Society of Petroleum Engineers - SPE Annual Technical Conference and Exhibition 1985",
address = "United States",
}