Knowledge of reservoir fluid properties is essential during the development phase, and to implement an optimal reservoir management strategy for properly exploitation of tire reservoirs. Interfacial tensions (IFTs) of reservoir fluids, as well as the contact angle are important parameters for many reservoir engineering studies. Examples are imbibition studies and calculation of fluid saturation in the gas-oil transition zone.

Both IFT and the contact angle of the fluids/rock system affect the distribution of fluids within reservoir rock material. The fluids distribution strongly affects the flow behavior and hydrocarbon recovery. Most of the available data, contact angle and IFT for crude gas/brine systems are for room temperature and atmospheric pressure. Since actual values of reservoir temperature and pressure are frequently encountered in oil field simulation models, a need to study IFT and the contact angle at reservoir conditions was recognized. This paper is an investigation of the influence of temperature and pressure on IFT and the contact angle of Khuff gas and condensate fluids.

Experimental results of IFT for Khuff-C gas/brine system and condensate A, B and C/brine system over a range of temperatures and pressures are reported. Also, results of the contact angle for various samples of condensate/brine/rock material systems are documented. The IFT between Khuff-C gas and brine decreased with increasing temperature at the maximum system pressure of 3,000 psi. Condensate composition effects on IFT were seen for various condensate samples (Khuff-A, B and C ). The contact angle values for Khuff-C gas/brine/rock material system decreased with both temperature and pressure.

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