Theoretical considerations indicate the dominant tule of gravitational force when emulsified oil flows iu low-tension environment . Spontaneous segregation observed in ve rtically oriented sand columns suggests the gravity underride of the mobilizing micellar solution. Experiments in horizontal siuusoidal glass capilla ry proved the gravitational separation of uil in extensions when it was displaced by low-tension water (LTW) . Gravity underride of LTW was demonstrated by visual studies on horizontal displacement at te rtiary couditions in micro and linear (2D) macromodels witti ' vertically o riented plane . They indicated the development of au instable emulsion bank behind the inelined front . The effect of segregation may result in a secondary entrapment witti a subsequent .decrease in o il recovery. Instability related to the emulsion bank could be minimied in gravity assisted vertical displacement .
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