Secondary oil recovery process
AssigneeTexaco Inc.
InventorsAlfred Brown, Stephen F. Hager, Moutaz Chichakli, Ching H. Wu
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Abstract
Oil is recovered from an oil-bearing subterranean formation penetrated by an injection well and a production well by injecting into the formation via the injection well a solution of a normally solid polymerized methacrylate and oil displaced by the injected solution is recovered from the formation via the production well. Optionally, after the solvent solution has been injected, a hydrocarbon slug such as crude oil, petroleum distillate, a soluble oil composition, etc. may be injected and, if desired, this may be followed by injection of water.
Claims19
The process for recovering oil from an oil-bearing subterranean formation penetrated by an injection well and a production well which comprises:
- a. injection into the formation via the injection well a solution of a normally solid, polymerized methacrylate in a water miscible solvent, and
- b. recovering from the formation the oil displaced by the injected solution via the said production well, and wherein the said polymerized methacrylate is a homopolymer having recurring units of the formula:
- ##STR2## wherein R is alkyl of from 1 to about 5 carbon atoms.
A process for recovering oil from an oil-bearing subterranean formation penetrated by an injection well and a production well which comprises:
- a. injecting into the formation via the said injection well a solution of a normally solid polymerized methacrylate in a water miscible solvent;
- b. injecting into the formation via the said injection well a hydrocarbon fluid,
- c. injecting into the formation via the injection well a solution of a water-soluble polymer, and
- d. recovering from the formation oil displaced via the said production well, and wherein the said polymerized methacrylate is a homopolymer having recurring units of the formula:
- ##STR3## wherein R is alkyl of from 1 to about 5 carbon atoms.
Dependencies are inferred from the claim text.