Irreversibility of Gas-condensate Flow in Gas Cycling Projects: Kinetically Stable Saturation Patterns
نویسنده
چکیده
Cet article prsente une tude de la dynamique dÕun rservoir biphasique multiconstituant approchant le rgime dÕcoulement stationnaire. En premier lieu, nous procdons une approximation linaire du modle compositionnel dans le cas des petites fluctuations autour du rgime permanent. Une expression analytique est ainsi obtenue pour le temps caractristique de transition. Des simulations numriques sont ensuite effectues pour les dviations importantes par rapport au rgime permanent. Nous avons ainsi pu tudier le dplacement linaire dÕun mlange gaz/condensat par un gaz enrichi suivi dÕun rgime de production. On montre alors que le changement de composition des phases et de pression lors de lÕvolution vers lÕtat dÕquilibre volue selon un temps caractristique comparable la dure dÕinjection. Cependant, le changement de saturation et de composition globale est environ 200 fois plus long que la dure dÕinjection. En consquence, lÕensemble du rservoir montre une distribution de saturation non homogne dans lÕespace, pendant un temps anormalement long. Des comportements stationnaires du mme type ont galement t dcouverts dans dÕautres systmes dynamiques non linaires : transitions de phase, plasmas, films minces. Nous avons examin la question de lÕexistence de rgimes permanents discontinus pour ce type dÕcoulement multiconstituant. Il nÕexiste en fait aucune solution de ce type dans le cas dÕun mlange binaire1.
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