Laboratory study of oscillatory multiphase flow in porous medium with chemically active skeleton

摘要

A laboratory study is conducted of high-viscosity mineral oil displacement by an acid solution in a synthetic porous medium with a chemically active skeleton. The skeleton is made of a mixture of glass balls and particles of sodium bicarbonate. The displacement is driven by the pressure difference between the inlet and outlet sides of the working cell and is accompanied by a gas-producing chemical reaction. The study is focused on the self-oscillating mode of the reaction wave propagation. This mode manifests itself in the appearance of periodically generated secondary waves and is accompanied by pressure oscillations. The experiments show that the amplitude of the pressure oscillations at the reaction front is directly proportional to the driving pressure difference, and that the frequency of the oscillations does not depend on it.