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

Abstract

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 CO 2 .

The Bitumen Upgrading of Nigerian Oil Sand by Supercritical Carbon Dioxide Modified with Alcohols

“…Supercritical fluids are compressible, and small pressure changes produce significant changes in their density and in their ability to solubilize compounds. Also, supercritical fluids have almost no surface tension; thus, they can penetrate low-porosity materials while their very low viscosity provides favorable flow characteristics. These properties enable supercritical fluids to provide excellent extraction efficiency and speed, which can be increased by adding small amounts of co-solvents …”

Development and Applications of a Compositional Pore-Network Model for Gas-Condensate Flow

“…Injecting gas on the reservoir after condensate accumulation affects not only the phases bulk properties, but also interfacial properties. Considering the potential impacts on relative permeability curves [117,118,106], these effects should be taken into account when choosing a gas mixture composition for injection in gas-condensate reservoirs. Figure 5.48 presents the interfacial tension for the mixtures containing 50% C 1 , C 2 , CO 2 or N 2 and 50% the reservoir fluid, in moles, calculated with the correlation proposed by Weinaug and Katz [29].…”