Magnitude and detailed structure of residual oil saturation
Experimental results are presented which demonstrate the effect on residual oil, under water-wet conditions, of particle size, particle size distribution, macroscopic and microscopic heterogeneities, microscopic dimensions such as ratio of pore body to pore throat size, and pore-to-pore coordination number. Experiments were performed in random packs of equal spheres, heterogeneous packs of spheres with microscopic and macroscopic heterogeneities, two-dimensional capillary networks having various pore geometries, and Berea sandstone. Detailed information on residual oil structure is presented, including blob size distributions of residual oil. Major conclusions are: (1) residual saturationds are independent of absolute pore size, per se, in systems of similar pore geometry; (2) well-mixed two-component aggregates of spheres gave virtually the same residual saturations as random packings of equal spheres; (3) clusters of large pores accessible through small pores will retain oil; (4) high aspect ratios tend to cause entrapment of oil as a large number of relatively small blobs, each held in single pores; and (5) the role of pore-to-pore coordination unber is generally secondary, hence correlations which have been proposed between residual oil and coordination number are unreliable.
- Research Organization:
- New Mexico Inst. of Mining and Tech., Socorro
- DOE Contract Number:
- AS19-80BC10310
- OSTI ID:
- 6474877
- Report Number(s):
- CONF-820419-
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States); ISSN SEAPA
- Country of Publication:
- United States
- Language:
- English
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Magnitude and detailed structure of residual oil saturation
Magnitude and detailed structure of residual oil saturation