کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
201430 460548 2013 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Temperature effects on the phase behaviour, mutual interactions and oil recovery of a light crude oil–CO2 system
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Temperature effects on the phase behaviour, mutual interactions and oil recovery of a light crude oil–CO2 system
چکیده انگلیسی

In this paper, the temperature effects on the phase behaviour, mutual interactions, and oil recovery of a light crude oil–CO2 system are experimentally studied. First, six PVT tests are performed to measure the saturation pressures and the oil-swelling factors of three light crude oil–CO2 systems with different CO2 concentrations. Second, a series of saturation tests are conducted to determine the onset pressure (Pasp) of asphaltene precipitation from the light crude oil–CO2 system. Third, the minimum miscibility pressure (MMP) and the first-contact miscibility pressure (Pmax) of the light crude oil–CO2 system are determined by applying the vanishing interfacial tension (VIT) technique. Meanwhile, the oil-swelling effect, the initial quick and subsequent slow light-hydrocarbons extraction phenomena are observed during the dynamic interfacial tension (IFT) measurements. In particular, the onset pressure (Pext) for the initial quick light-hydrocarbons extraction by CO2 is noted. Finally, a total of eleven CO2-coreflood tests are undertaken to examine the temperature effect on the CO2-based oil recovery. All the above-mentioned experiments are conducted at a laboratory temperature of Tlab = 27.0 °C and at the actual reservoir temperature of Tres = 53.0 °C, respectively. It is found that the test temperature has a strong effect on the saturation pressure but a marginal influence on the oil-swelling factor of a given light crude oil–CO2 system. It is also found that the four onset pressures are in the order of magnitude: Pasp < Pext < MMP < Pmax. Furthermore, Pasp and Pext increase slightly but the MMP and Pmax increase significantly with the test temperature. Lastly, a higher test temperature leads to a higher oil recovery factor as long as the CO2 flooding is miscible.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fluid Phase Equilibria - Volume 356, 25 October 2013, Pages 78–89
نویسندگان
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