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《Natural Gas Industry》 2003-03
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THE PREDICTION METHOD FOR WAX PRECIPITATION

Mei Haiyan,Zhang Maolin,Li Shilun,Sun Liangtian,Sunlei,and Guoping (Southwest Petroleum Institute)  
Wax and asphalt solid precipitation in oil and gas recovering process is a problem considering very much at home and abroad in the petroleum industry.The organic solid precipitation happening in the recovering process along with the changes of thermodynamic conditions,such as temperature, pressure and composition,influences the oil and gas production severely.Especially in the process of gas injection for enhancing oil recovery,the wax and asphalt solid precipitation resulting from molecular transferring among phases may change permeability and wet ability in the porous media and influence the improvement of recovering rate and the effect of gas injection.The article uses the state equation to describe the phase behavior of both gas and liquid phases,and the solution theory to correct the non ideality of the solid phase.Then a thermodynamic model of gas liquid solid three phases is developed combining the gas liquid balance model basing on the state equation and the liquid solid balance model basing on the solution theory.The gas liquid solid three phases balance model is used to study the wax solid precipitation for an oil and gas system.The calculation results demonstrate that the state conversion of gas liquid solid three phases happens as temperature and pressure changes.Pressure affects both the wax precipitation temperature and the amount of wax precipitation.The influence of pressure on wax precipitation temperature is much higher when the pressure is lower than the saturation pressure.
【Fund】: 油气藏地质及开发工程国家重点实验室资助项目 (PLN990 1);; 国家“九五”重点科技攻关项目 (编号 96 - 12 1- 0 7-0 4 )成果
【CateGory Index】: TE311
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