Pressure and Composition Effect on Wax Precipitation: Experimental Data and Model Results
Pressure and Composition Effect on Wax Precipitation: Experimental Data and Model Results
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DOI：
10.2118/36740-pa
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发表时间：
1997-11
期刊：
影响因子：
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通讯作者：
Huanquan Pan;A. Firoozabadi;P. Fotland
中科院分区：
文献类型：
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作者：
Huanquan Pan;A. Firoozabadi;P. Fotland
Wax precipitation is often studied using the stock tank oil. However, precipitation may be very different in well tubing and production facilities due to the effects of pressure and composition. As an example, the cloudpoint temperature may decrease as much as 15 K from atmospheric pressure to the saturation pressure of 100 bar mostly due to the dissolution of light gases into the oil (i.e. due to composition changes). It is also often assumed that the addition of solvents such as C 5 and C 6 decreases the cloudpoint temperature. On the contrary, from our modeling results, we have found that the mixing of a crude with a solvent increases the cloudpoint temperature (i.e., enhances the wax precipitation). In this study, the cloundpoint temperature at live oil conditions and the amount of the precipitated wax at stock tank oil conditions are provided for three crudes. A modified multisolid wax precipitation model is used to study the effects of pressure and composition on wax precipitation. The modeling results reveal that an increase in methane and CO 2 concentration decreases the cloudpoint temperature while an increase in C 5 concentration increases the cloud point temperature.
