Patent ID: 9719335
Date: 2017-08-01
CPC Classifications: C09K,E21B

Claim:
1. An optimized enhanced recovery method for hydrocarbons contained in a geological reservoir, comprising: injecting into said reservoir a sweep fluid comprising at least one polymer in an aqueous solution at a concentration between 200 and 5000 ppm so as to displace said hydrocarbons towards at least one production well, collecting into the production well from the geological reservoir a production fluid, said production fluid comprising an aqueous phase and the hydrocarbons, and after collecting from the geological reservoir into the production well said production fluid and after detecting the presence of said at least one polymer in said production fluid in an amount ranging between 200 and 5000 ppm, injecting into said production fluid collected from the geological reservoir into the production well at least one degradation agent for said at least one polymer, said injection providing a concentration of the at least one degradation agent in an aqueous solution of 0.1-5.000 ppm, said injection being performed in situ at a location selected from the group consisting of the bottom of the production well, the top of the production well, and in the production lines.