E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
31/14
E21B 43/22 (2006.01)
Patent
CA 1281894
A CO2 DRIVE PROCESS FOR OIL RECOVERY EMPLOYING AN ALCOHOL ETHOXYCARBOXYLATE SURFACTANT Abstract of the Disclosure A process for enhancing the recovery of oil form a s? ? oil-containing reservoir having a temperature of at least about 40°C, which comprises steps for a) injecting into an injection well in the reservoir substan- tially liquid CO2 and an aqueous mixture containing between about 50 and 10,000 parts per million by weight, calculated on the weight of the water, of one or more surfactants of the formula R-(OCH2CH2)x-Z wherein R represents an alkyl group of about 8 to 16 carbon atoms, x is an integer having an average value of about 5 to 20, and Z represents either a -OCOOM formate group or a -OCH2COOM acetate group, with M representing a mono-valent inorganic cation, to displace oil from the reservoir, and b) recovering the displaced oil from one or more recovery wells in the reservoir. The alcohol ethoxycarboxylate surfactants utilized in this process provide excellent control over the mobility of the CO2 in the reservoir, and its performance is relatively insensitive to the presence of any of a wide variety of different crude oils.
547260
Shell Canada Limited
Smart & Biggar
LandOfFree
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