1991
DOI: 10.2118/17374-pa
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Displacement Mechanism and Water Shielding Phenomena for a Rich-Gas/Crude-Oil System

Abstract: Summary This paper presents an experimental study involving a series of hydrocarbonmiscible displacements of a crude oil. Compositional analyses of both flowingeffluent phases show that most of the oil was recovered by the condensing-drivemechanism. High mobile water saturations in the highly water-wet Berea coresused led to the same oil-trapping phenomena as noted for CO2 displacements. Introduction Benham et al. and others … Show more

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Cited by 19 publications
(5 citation statements)
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“…The water-shielding phenomenon is a strong function of wettability and is more strongly exhibited in water-wet media than oil-wet media (27,28) . This phenomenon leads to decreased oil recoveries in waterwet media (28) and similar oil trapping effects have been observed for HC and CO 2 injectants in both MCM and FCM displacements (35) .…”
Section: Effect Of Mobile Water Saturationsupporting
confidence: 65%
“…The water-shielding phenomenon is a strong function of wettability and is more strongly exhibited in water-wet media than oil-wet media (27,28) . This phenomenon leads to decreased oil recoveries in waterwet media (28) and similar oil trapping effects have been observed for HC and CO 2 injectants in both MCM and FCM displacements (35) .…”
Section: Effect Of Mobile Water Saturationsupporting
confidence: 65%
“…As seen from Figure A, the residual oil ganglions are disconnected from each other and are shielded by water layers which cause CO 2 cannot directly contact all the residual oil. This phenomenon is called water blockage or water shielding effect. , In this case, if the oil swelling due to the diffusion of CO 2 from the water barrier into the oil is enough to rupture the water layer, the trapped oil will be produced otherwise the trapped oil will remain in the reservoir as an unrecoverable phase.…”
Section: Discussionmentioning
confidence: 99%
“…This phenomenon is called water blockage or water shielding effect. 30,31 In this case, if the oil swelling due to the diffusion of CO 2 from the water barrier into the oil is enough to rupture the water layer, the trapped oil will be produced otherwise the trapped oil will remain in the reservoir as an unrecoverable phase.…”
Section: Industrial and Engineering Chemistry Researchmentioning
confidence: 99%
“…Injection strategies like water alternating gas (WAG) injection have been used to ease this problem. Although WAG injection can improve sweep efficiency to some extent, however, it can result in significant oil trapping, which adversely affects oil recovery, (Tiffin et al 1991 andEugene andEdward, 1990). Presence of water reduces the gas/oil interfacial area hence reducing mass transfer.…”
Section: Introductionmentioning
confidence: 99%