نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشگاه صنعتی امیرکبیر، دانشکده مهندسی نفت
2 دانشکده مهندسی نفت، دانشگاه صنعتی امیرکبیر
3 استادیار دانشکده مهندسی نفت دانشگاه صنعتی امیر کبیر
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسنده [English]
There are always surface forces at the interface of fluid phases that affect the phase balance of the fluid under consideration. Tension always exists at the interface of fluid phases, due to unbalanced molecular attractive and repulsive forces. A quantitative index of molecular tension at the interface between the vapor and liquid phase is surface tension, which is defined as the force applied per unit length of the interface or energy per unit interface. Surface tension exists only when the vapor and liquid phases are in equilibrium.
One of the most important applications of surface tension evaluation in reservoir studies is capillary pressure prediction to consider the fluid distribution within a reservoir and the estimation of minimum miscibility pressure in gas injection processes. Although the relative permeability is highly dependent on the surface tension, the dynamic evaluation of the multiphase flow behavior in the reservoir porous medium would also be highly influenced by this parameter.
In this study, surface tension modeling is developed using intermolecular thermodynamic potential function including the two-parameter Lennard-Jones model in a semi-analytical form and the three-parameter well-square model in a full-analytical form in a wide range of temperatures in the bulk scale.
The comparison of the results for hydrocarbon fluids (light to heavy) and non-hydrocarbon fluids shows that the prediction of surface tension through the square-well model, due to its high flexibility and mathematical simplicity compared to the Lennard-Jones model, provides significant agreement with experimental data.
کلیدواژهها [English]
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