Measurement and corresponding states modeling of asphaltene precipitation in Jilin reservoir oils

• Published in: Journal of petroleum science & engineering Vol. 41; no. 1; pp. 169 - 182
• Main Authors: Hu, Yu-Feng, Li, Shi, Liu, Ning, Chu, Yan-Ping, Park, Sang J., Mansoori, G.Ali, Guo, Tian-Min
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 2004; Elsevier Science
• Subjects: Applied sciences; Asphaltene precipitation; CO 2 injection; Constitution and properties of crude oils, shale oils, natural gas and bitumens. Analysis and characteristics; Corresponding states principle; Crude oil, natural gas and petroleum products; Energy; Exact sciences and technology; Fuels; Pressure depletion; Reservoir oil; Asia; China; Corresponding states principle; Pressure depletion; Reservoir oil; CO 2 injection; Asphaltene precipitation; Asphaltene; Carbon dioxide; Oil field; Carbon dioxide injection; Correspondence principle; Modeling; Pressure; High pressure; Precipitation; Depletion; Pressure effect; Equations of state; Crude oil; Alkane
• ISSN: 0920-4105; 1873-4715
• DOI: 10.1016/S0920-4105(03)00151-7

The asphaltene precipitation of two reservoir oil samples collected from Jinlin oil field has been studied under pressure and with/without CO 2-injection conditions. No asphaltene precipitation was detected during the pressure depletion processes without CO 2 injection. For the CO 2-injected oil systems, the effects of operating pressure, injected CO 2 concentration, and multiple-contact on the onset and amount of asphaltene precipitation were studied under the reservoir temperature. No asphaltene precipitation was observed when the operating pressure is remote from the minimum miscibility pressure (MMP). However, appreciable asphaltene precipitation was detected when the operating pressure approached or exceeded the MMP. The amount of asphaltene precipitation increased with the concentration of injected CO 2. A generalized corresponding states principle (CSP) for prediction of asphaltene precipitation data is produced and reported here. The proposed CSP theory complements the scaling equation for asphaltene precipitation under the influence of n-alkane precipitants. Based on literature data and the data measured in this work, the parameters and exponents of a corresponding states equation capable of describing the asphaltene precipitation behavior in the studied high-pressure CO 2-injected crude oil systems are reported.