| Abstract: | When petroleum is extracted from strata by replacing it with other fluids, the question arises of the stability of the interface. Uniformity in the injection horizons is in practice achieved by such methods as using polymer additives to thicken the replacing fluid or introducing an intermediate layer with non-Newtonian properties between the replacing fluid and the fluid being replaced. In this article the stability of the interface of non-Newtonian fluids being filtered exponentially is investigated in a linear formulation. The condition governing the stability of the interface of two non-Newtonian fluids is found and the influence of the thickness of the intermediate layer on the stability is also demonstrated. The presence of the layer is found to be essential for certain parameters of fluids moving in a porous medium if the replacement is to be stable.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 2, pp. 183–186, March–April, 1976.The author wishes to thank V. N. Nikolaevskii for suggesting the subject for this investigation and A. T. Listrov for his constant interest in the work. |
