Solvent stimulation of viscous oil via a horizontal wellbore

Details Solvent stimulation of viscous oil via a horizontal wellbore Solvent stimulation of viscous oil via a horizontal wellbore

E - Fixed Constructions

21

B

166/29

E21B 43/27 (2006.01) E21B 43/25 (2006.01) E21B 43/30 (2006.01) E21B 43/40 (2006.01)

Patent

CA 2004527

ABSTRACT A two step solvent stimulation method for producing heavy-oil from a formation wherein a horizontal wellbore is utilized. Said wellbore is filled with a solvent of a predetermined density. Next a displacement fluid having a density greater than said solvent is injected into the wellbore. Continued pumping of said displacement fluid causes the solvent having a lighter density to be displaced into said formation thereby enhancing the penetration of said solvent into the formation. Thereafter, pumping is terminated. Subsequently, the displacement fluid and solvent thinned heavy-oil are produced from said formation.

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