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Abstract
Asphaltene precipitation is a sophisticated issue in the upstream oil industry, worldwide, and has detrimental effect on a verity of production processes; it damages the properties of the reservoir and causes an unfavorable and significant decrease in oil production. In spite of numerous studies to predict asphaltene behavior, the effect of temperature on asphaltene precipitation during pressure depletion at reservoir conditions is still obscure in the literature. In this study the PVT data as well as experimental data of asphaltene precipitation at reservoir conditions of an Iranian light oil samples is used, and the asphaltene precipitation and deposition envelops (APE and ADE) of the oil are developed using solid thermodynamic modeling.
Nomenclatures:
| ϕi | = | fugacity ceofficient |
| bi | = | Binary Interaction Parameter |
| CP | = | Isobaric Heat Capacity |
| fs | = | solid fugacity |
| f*s | = | refrence solid fugacity |
| G | = | gibbs energy |
| H | = | anthalpy |
| Ki | = | K-Value |
| kij | = | Binary Interaction parameter |
| P | = | pressure |
| Pb | = | Bubble point pressure |
| P* | = | reference pressure |
| R | = | Universal Gas Constant |
| si | = | Dimensionless Volume Shift |
| T | = | temprature |
| Ttp | = | Tripel Point Temprature |
| V | = | Volume |
| VL | = | Liquid molar volume |
| Vs | = | solid molar volume |
| xi | = | Liquid composition percent |
| yi | = | Gas Composition percent |