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Modeling Non-Equilibrium Dynamics of Condensate Recovery for Mature Gas-Condensate Fields

机译：成熟气凝析液凝结储存的非平衡动力学

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Theoretical and experimental studies, as well as actual data of gas-condensate fields development, indicate non-equilibrium phase behavior at low reservoir pressures. However, matching of pVT-models and prediction of condensate (group C_()) recovery dynamics are performed on the basis of equilibrium constant volume depletion (CVD) experiments and simulations. This results in unreasonably high expected values of the condensate recovery factor and in selection of unappropriate technological regimes for reservoir development. To simulate properly the actual dynamics of C_(5+) content in reservoir gas during revaporization (regular evaporation) at low pressures, one should consider non-equilibrium phase behavior of hydrocarbon mixtures. In this study, a numerical algorithm for simulation of the non-equilibrium constant volume depletion (NCVD) process is developed on the basis of the previously proposed model for non-equilibrium phase behavior and the non-equilibrium flash algorithm for calculation of phase fractions and compositions. The NCVD algorithm and two pVT-models of reservoir hydrocarbons are used to simulate the dynamics of condensate recovery at Vuktylskoye field. A special procedure is used to match the pVT-models to lab and field data. During the development of Vuktylskoye field, reservoir pressure has decreased from 36.6 MPa to 2.5 MPa, with the dew-point at 32.3 MPa. Non-equilibrium phase behavior is essential for gas-condensate reservoirs at pressures below the maximum condensation pressure. For the case considered, non-equilibrium effects are expressed in significant deviation of the actual curve of C_(5+)-content in reservoir gas from the results of equilibrium experiments for pressures less than 5 MPa. The NCVD algorithm and the two pVT- models are used to simulate the dynamics of C_(5+)-content in the reservoir gas at low pressures. A satisfactory match to the actual data is achieved for both the models by adjustment of characteristic relaxation time of the gas-condensate reservoir system to the value of about 30 years. This value, considering rescaling, is in good agreement with the experimental calorimetry data for non-equilibrium phase behavior. Equal values of characteristic relaxation time for both the pVT-models certify the possibility of physical simulation of nonequilibrium condensate revaporization by the NCVD algorithm regardless of specifics of a pVT-model previously matched to equilibrium experimental data.
机译：理论和实验研究，以及气凝块田地开发的实际数据，表明低储层压力下的非平衡相位行为。然而，基于平衡恒定体积耗尽（CVD）实验和模拟，对PVT模型和缩合物的预测（组C_（））恢复动力学的匹配。这导致冷凝物恢复因子的不合理高预期值，以及选择储层发育的无次技术制度。为了在低压下升压（定期蒸发）期间，在蓄水期间模拟储层气体中C_（5+）含量的实际动态，应该考虑烃混合物的非平衡相行为。在该研究中，基于先前提出的非平衡相位行为和用于计算相位分数的非平衡闪存算法的先前提出的模型开发了一种用于模拟非平衡恒定体积耗尽（NCVD）工艺的数值算法。组成。 NCVD算法和储层烃的两种PVT型号用于模拟Vuktylskoye领域冷凝水回收的动态。使用特殊过程将PVT模型与实验室和现场数据匹配。在Vuktylskoye领域的开发期间，储层压力从36.6MPa降至2.5MPa，露点为32.3MPa。非平衡相位行为对于低于最大缩合压力的压力下的气体冷凝水储存是必需的。对于考虑的情况，从储层气体中C_（5 +）含量的实际曲线的显着偏差，从储存气体的实际曲线的显着偏差表达，从低于5MPa的压力的均衡实验结果的实际曲线的实际曲线。 NCVD算法和两种PVT模型用于在低压下模拟C_（5 +） - 储层气体中的含量的动态。通过调整气凝液储层系统的特征松弛时间来实现与实际数据的令人满意的匹配，以便约30年的值。考虑重构的该值与非平衡相行为的实验量热法数据吻合良好。对于PVT模型的相同特性松弛时间值证明了NCVD算法不论先前匹配的PVT模型是否具体化的NCVD算法的物理仿真的可能性。

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