Cet article prŽsente des calculs de lÕeffet dÕinversion de JouleThomson pour des gaz ˆ condensats ˆ haute tempŽrature et haute pression. La dŽtente isenthalpique a ŽtŽ modŽlisŽe pour plusieurs compositions de gaz ˆ condensats trouvŽes dans la littŽrature, en utilisant les Žquations dÕŽtat de Soave-Redlich-Kwong et de PengRobinson. Ces calculs confirment qualitativement le rŽchauffement des gaz ˆ condensat lors de la dŽtente. Bien que les tempŽratures de gisement se trouvent dans la rŽgion o• un refroidissement sÕobserve, cÕest-ˆ-dire ˆ lÕintŽrieur de la courbe dÕinversion, on a montrŽ que les pressions de gisement corrspondent ˆ lÕextŽrieur de cette rŽgion, de sorte que la tempŽrature augmente jusqu'ˆ ce que la courbe dÕinversion soit atteinte. Le rŽchauffement calculŽ nÕest pas tr•s important. Il est typiquement de 10 ˆ 30¡C pour des pressions de gisement de 1000 bar, la valeur exacte dŽpendant de la composition du fluide, des conditions de gisement et de la diminution de pression. Une Žtude de sensibilitŽ a montrŽ que la pression du gisement et la composition du fluide exercent une influence particuli•re sur le rŽchauffement. Si la pression du gaz ĉ ondensat ou sa teneur en constituants lourds sont ŽlevŽes, lÕeffet thermique possible est accru. Malheureusement, ces rŽsultats de calcul nÕont pas pu •tre validŽs par manque de donnŽes expŽrimentales. HIGH PRESSURE BEHAVIOR OF HYDROCARBONS J O U L E -T H O M S O N E X P A N S I O N O F G A S C O N D E N S A T E SThis paper presents calculations of Joule-Thomson inversion effects in high-pressure-high-temperature gas condensates. Isenthalpic expansions were modeled for several gas condensate mixtures reported in literature using the Soave-Redlich-Kwong and the Peng-Robinson equations of state. The calculations confirmed qualitatively the heating of gas condensates at expansion. Although reservoir temperatures are in the region where cooling occurs, i.e., inside the inversion curve, it was shown that reservoir pressures lie outside this region, and that the temperature will increase until the inversion curve is reached. The calculated temperature increases are not very large. Although exact values depend on fluid composition, reservoir conditions, and pressure drop, typical calculated temperature increases are in the range of 10-30¡C for reservoir pressures of 1000 bar. A sensitivity study showed that both reservoir pressure and fluid composition greatly affect the temperature increase. With increasing pressures and increasing amounts of heavy constituents present in gas
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