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Measurement and Quantification of Diffusion-Induced Compositional Variations in Absence of Convective Mixing at Reservoir Conditions

  • Ram R. RatnakarEmail author
  • Birol Dindoruk
  • Greg Odikpo
  • Edward J. Lewis
Article
  • 24 Downloads

Abstract

We present numerical and experimental investigation on the existence of diffusion-induced compositional variations in a reservoir fluid in the absence of convective mixing. New pressure-decay experimental data are presented for ethane in contact with stock tank oil, and the values of diffusivity and solubility parameters are obtained by using the one-dimensional transient diffusion model and integral-based regression method. We show the variation in oil composition through composition-height measurements at the end of the experiment. Finally, the diffusion model with estimated parameters is used to predict the compositional variations, where comparisons show excellent agreement with the measurements, validating the parameter estimation technique and quantifying the compositional variations in the oil phase caused by diffusion.

Keywords

Modeling and experiments Compositional variations Early and late transient solutions Diffusivity Solubility 

Abbreviations

STO

Stock tank oil

GC

Gas chromatography

LTS

Late transient solution

ET

Early transient solution

Notes

Acknowledgements

The authors wish to thank Shell International Exploration and Production Inc. for granting the permission to publish the work.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Shell International Exploration and Production Inc.HoustonUSA

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