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《PETROLEUM EXPLORATION AND DEVELOPMENT》 2000-01
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A thermodynamic model for the prediction of paraffin deposition

Mei, HaiYan; et al. (Petroleum Engineering Department, Southwest Petroleum Institute, Sichuan 637001, P. R. China). Shiyou Kantan Yu Kaifa 2000, 27(1), 84 86.  
Crude oil with dissolved paraffin is a true solution. When thermodynamic conditions changes, paraffin may deposit on the surfaces of porous media or on pipe walls in the form of crystals resulting in a plugging giving serious troubles in oil production. A thermodynamic model is suggested in this paper to predict the deposition of paraffin from the crude oil. Corrections are made to the non ideal condition caused by solid mixture according to the normal solution theory. This model uses the equation of state to describe gas phase and liquid phase simultaneously, giving the effects of the compositions of the system, pressure as well as the mutual effects of various components; and thus the multiple phase equilibrium regularities can be reflected more accurately. The effects of thermodynamic capacity difference of liquid phase and solid phase on the deposition of paraffin are considered and this model can be used to determine the temperature (or pressure) at which paraffin may begin to settle out from the crude and the amount of paraffin deposited out as temperature (or pressure) is lowered more and more. The temperature at which the paraffin begin to deposit predicted with this model conforms fairly well with that given by actual experimental data.
【Fund】: 国家“九五”重点科技攻关项目!(编号 96 1 2 1 0 7 0 4 );;西南石油学院油气藏地质及开发工程国家重点实验室基金资助项目! (编号PLN99
【CateGory Index】: TE35
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