Method for resolving emulsions in enhanced oil recovery operations
a technology of enhanced oil recovery and emulsion, which is applied in the direction of separation process, chemical apparatus and process, dewatering/demulsification with chemical means, etc., can solve the problems of significant quantities of non-produced crude oil remaining in the reservoir, uneconomical, and unpractical, and achieve the effect of efficient resolving an emulsion comprising oil and enhanced oil recovery process
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example 1
9 grams of water (0.50 mole) was added to a 500 ml 3-neck reactor flask, and then sparged with nitrogen for 15 minutes. 2 ml of boron trifluoride was slowly added and the mixture was heated to 60° C. When the temperature was reached 60° C., the heater was removed and 231.3 g of epichlorohydrin (2.5 mole) was slowly added with stirring. This reaction was exorthemic and the temperature was kept between 90 and 100° C. with the use of an ice bath. After complete addition of epichlorohydrin, the reaction was held for another 1 hour at 90° C., and then for 30 minutes at 110° C. The reactor was then cooled to 40° C. and the polyepichlorohydrin was transferred to an autoclave for quarternization. About 361.22 grams of 45% trimethylamine aqueous solution (2.75 mole of trimethyamine) was added to polyepichlorohydrin. The blend was heated to 100° C. for 24 hours. The composition was clear without sediments. The theoretical molecular weight is about 780 g / mole and this product is named Composit...
example 2
Cocktails 1 and 2 as shown in Table 1 are fluids that were injected into the reservoir to enhance oil recovery. The emulsion was produced in the lab by mixing either Cocktails 1 or 2 with the oil at 90:10 or 50:50 by weight, respectively, under a high shear via the Silverson L4RT Mixer at 5,000 rpm for 2 minutes. The produced emulsion was then subjected to the described testing. Cocktails 1 and 2 contained a very low concentration of the surfactant that was used to achieve ultra low interfacial tension between the trapped oil and the injection fluid / formation water. The ultra low interfacial tension also allowed the alkali present in the injection fluid to penetrate deeply into the formation and contact the trapped oil globules. The alkali present in the fluids (e.g., Na2CO3) then reacted with the acidic components in the crude oil to form additional surfactant in-situ to continuously provide ultra low interfacial tension and free the trapped oil. In the alkaline surfactant polymer ...
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