Effect of Hydrocarbon and Non-Hydrocarbon Gas Injection on the Interfacial Tension of a Gas Condensate System

Experimental results of interfacial tension (IFT) of condensate-brine-gas systems over a pressure range of 1000 to 8000 psi and a temperature range of 95 to 160 °C are presented. High-pressure high-temperature video-enhanced pendent drop tensiometry was established to capture drop images for IFT measurements at various reservoir thermodynamic conditions. This paper serves as a building block to the essential practical understanding of the surface effects associated with improved condensate recovery from gas condensate reservoirs by gas injection. This understanding is critical for ascertaining gas injectivity, displacement and trapping in the pore spaces, and potential geological storage of CO₂.