Wells – Processes – Distinct – separate injection and producing wells
Reexamination Certificate
2006-08-15
2006-08-15
Bagnell, David (Department: 3672)
Wells
Processes
Distinct, separate injection and producing wells
C166S272700, C166S401000
Reexamination Certificate
active
07090014
ABSTRACT:
Steam assisted gravity drainage (“SAGD”) is practised in a first section of a reservoir containing heavy oil. When steam/oil ratio rises sufficiently, steam injection into the first section is curtailed or terminated. Non-condensible gas is then injected into the section to pressurize it and production of residual oil and steam condensate is continued. Concurrently with pressurization, SAGD is practised in an adjacent reservoir section. As a result, some of the residual oil in the first section is recovered and steam loss from the second section to the first section is ameliorated.
REFERENCES:
patent: 3705625 (1972-12-01), Whitten et al.
patent: 4700779 (1987-10-01), Huang et al.
patent: 4727937 (1988-03-01), Shum et al.
patent: 2015460AA (1991-10-01), None
patent: 2015460 (1993-12-01), None
Good William Keith
Kisman Kenneth E.
Luhning Rick W.
Alberta Science and Research Authority
Bagnell David
Collins Giovanna M.
Sheridan & Ross P.C.
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