Wells – Processes – Distinct – separate injection and producing wells
Reexamination Certificate
2011-06-21
2011-06-21
Kugel, Timothy J. (Department: 1761)
Wells
Processes
Distinct, separate injection and producing wells
C166S245000, C166S270100, C166S305100, C507S209000, C507S216000, C507S219000, C507S221000, C507S253000, C507S255000, C507S256000
Reexamination Certificate
active
07963329
ABSTRACT:
A method including a) injecting into the formation an aqueous solution containing a polymer and a surfactant to create a organic phase and a aqueous phase, the surfactant being capable of reducing the interfacial tension between the phases to less than 1 dyne/cm; b) recovering a portion of the organic and aqueous phases containing at least a portion of the polymer and surfactant components and a portion of native petroleum surfactants generated in the porous formation; c) adjusting the conditions of the recovered portions to force a portion of the polymer and surfactant from one phase into the other phase by use of chemical, physical, electrical or gravitational means or a combination of said means; d) separating the polymer-and surfactant-containing phase; e) concentrating the polymer and surfactant components in the separated phase; and f) re-injecting at least a portion of the concentrated polymer and surfactant components into the formation.
REFERENCES:
patent: 4706749 (1987-11-01), Hayes et al.
Redican Joseph Michael
Shahin Gordon Thomas
Admasu Atnaf
Kugel Timothy J.
Shell Oil Company
Taylor Richard B.
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