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Gas Condensate Diagnostic Plot

cgr_normalization

In gas condensate fields (wells), the solution CGR (\(r_{s} | R_{v}\)) versus pressure of the insitu reservoir fluid composition will give a very good estimate of the actual CGR performance of the well, i.e.

  • producing CGR vs average reservoir pressure in conventionals
  • producing CGR vs bottomhole pressure in unconventionals

In unconventionals, a difference between the producing CGR and the solution CGR vs. bottomhole pressure is observed in some basins. In those cases, it is important to examine why, i.e.

  • Is it coupled with completion practices? If so, can it be used to quantity a fracture area / shattered volume? Can it be used to differentiate between good and bad completion practices?
  • Is it related to fluid heterogeneity? If so, can it be used for fluid initialization?
  • Is it relative permeability related?

References

[1] Carlsen, M. L., Dahouk, M. M., Hoffmann, A., & Whitson, C. H. (2020, September 24).CGR Normalization-Convert Rates to a Common Surface Process. Society of Petroleum Engineers. doi:10.2118/199982-MS

[2] Whitson, C. H., & Sunjerga, S., PVT in Liquid-Rich Shale Reservoirs, SPE-155499-MS, Society of Petroleum Engineers, 2012.