Science & Technology Review >

2011 , Vol. 29 >Issue 11-04: 39 - 43

DOI: https://doi.org/10.3981/j.issn.1000-7857.2011.04.005

Articles

Oil by Capillary Spontaneous Imbibitions

  • Zhi-Gang HE
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Received date: 2010-12-03

  Revised date: 2011-01-07

  Online published: 2011-02-08

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Abstract

Waterflooding is relatively inexpensive and easy to control, but waterflooding recovery efficiency is low for high viscosity oil due to the adverse mobility ratio between oil and injected water in high viscosity heavy oil fields. Previous studies showed that capillary forces often neglected due to high oil viscosity are important even in the heavy oil systems. At low injection rates, water imbibitions can be used to improve oil recovery. Therefore waterflooding could become a viable technique for non-thermal enhanced oil recovery, even in the fields with very high oil viscosity. It is recently found that the methods improving the waterflooding recovery efficiency by augmenting the capillary forces to inhibiting bypass flow of injection water on macroscopic or microscopic heterogeneity are also applicable to the sandstone reservoir, heavy oil reservoir, and the polymer flooding. On the basis of the principle of oil reservoir physical chemistry and pore-doublet model proposed, the effects of the injection rate and wettability to the capillary imbibitions are studied, the some conventional viewpoint in some oil reservoir textbooks is considered probably questionable. The results indicate that the injection rate control and the wettability alteration from oil-wet to water-wet conditions are the technical key of the method.

Key words： waterflooding; capillary force; pore-doublet model; injection rate; wettability; heavy oil

Cite this article

Zhi-Gang HE . Oil by Capillary Spontaneous Imbibitions[J]. Science & Technology Review, 2011 , 29(11-04) : 39 -43 . DOI: 10.3981/j.issn.1000-7857.2011.04.005

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