Steady -state relative permeability measurements and interpretation with account for capillary effects

摘要

A multirate steady-state technique to measure relative permeabilities is presented. The technique eliminates interpretation errors related to the capillary end effect. To determine relative permeabilities of the two phases, individual phase pressure drops across the core have to be measured or calculated. In order to make the individual phase pressure drops measurable, a modified construction of the inlet end piece is suggested. Capillary end effects taking place during core flooding experiments at steady-state conditions both at inlet and outlet ends are theoretically analysed and studied by simulations in 2D.