E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
31/23
E21B 43/22 (2006.01) C08F 20/56 (2006.01) C09K 8/588 (2006.01)
Patent
CA 1135490
ABSTRACT OF THE DISCLOSURE In a process for recovering oil from underground formations of the type wherein a dilute aqueous solution of an acrylamide polymer is injected into one or more wells the improvement which comprises: establishing near the one or more wells a small chemical plant and a source of acrylonitrile for producing an acrylamide polymer in the form of water-in oil emulsion, which plant performs the following sequence of steps: 1. Forming a water-in-oil emulsion of acrylonitrile utilizing as an oil source crude oil recovered from the underground formation; 2. Contacting said emulsion with a conversion catalyst under reaction conditions to convert a substantial portion of the acrylonitrile to acrylamide thereby forming a water- in-crude-oil emulsion which contains a substantial portion of acrylamide; 3. Polymerizing the water-in-crude-oil emulsion of acrylamide in the presence of a free radical catalyst to provide a water-in-crude-oil emulsion of acrylamide polymers, and then; Injecting the water-in-crude-oil emulsion of the acrylamide polymer in the presence of an inverting agent into the underground formation under conditions whereby the formation is contacted with a dilute solution of the acrylamide polymer.
364592
Nalco Chemical Company
Smart & Biggar
LandOfFree
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