Abstract
Abstract Current practice in the evaluation of suitable EOR solvents involves performing a number of slim tube displacement experiments. The information obtained from these tests is generally sufficient for the determination of minimum miscibility pressure (MMP) or minimum miscibility composition (MMC). However, in a standard slim tube displacement test, it is not possible to obtain quantitative information with regard to the phase behaviour of the transition zone fluids. This information is crucial for the development and tuning of compositional reservoir models used for simulating miscible displacement processes. Presently, this information is obtained from static fluid property tests such as P-х (swelling) or Benham multiple contact tests. In this work, new experimental data for live transition zone fluid properties and compositions generated during a multi-component hydrocarbon displacement process are presented. In addition, the experimental transition zone fluid properties have been predicted using an equation of state (EOS) model based on a fluid characterization obtained by matching P-х data. Results of these calculations indicate that it is not possible to predict transition zone fluid behaviour for the system under consideration using an EOS characterization based only on P-х data.
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