Temperature Prediction for High Pressure High Temperature Condensate Gas Flow Through ChokesReport as inadecuate




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1

School of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China

2

CNPC Key Laboratory of Oil & Gas Storage and Transportation, Southwest Petroleum University, Chengdu 610500, China





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Abstract This study developed a theoretical model for predicting the downstream temperatures of high pressure high temperature condensate gas flowing through chokes. The model is composed of three parts: the iso-enthalpy choke model derived from continuity equation and energy conservation equation; the liquid-vapor equilibrium model based on the SRK equation of state EoS; and the enthalpy model based on the Lee-Kesler EoS. Pseudocritical properties of mixtures, which are obtained by mixing rules, are very important in the enthalpy model, so the Lee-Kesler, Plocker-Knapp, Wong-Sandler and Prausnitz-Gunn mixing rules were all researched, and the combination mixing rules with satisfactory accuracy for high pressure high temperature condensate gases were proposed. The temperature prediction model is valid for both the critical and subcritical flows through different kinds of choke valves. The applications show the model is reliable for predicting the downstream temperatures of condensate gases with upstream pressures up to 85.54 MPa and temperatures up to 93.23 °C. The average absolute errors between the measured and calculated temperatures are expected for less than 2 °C by using the model. View Full-Text

Keywords: high pressure and high temperature; condensate gas; choke; temperature prediction; model high pressure and high temperature; condensate gas; choke; temperature prediction; model





Author: Changjun Li 1,2, Wenlong Jia 1,* and Xia Wu 1

Source: http://mdpi.com/



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