On the Analysis of Well Test Data Influenced by Capillary Pressure

Ehsan Nikjoo*, Riyaz Kharrat, Amir Jahanbakhsh, A. Emamzadeh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The focus of this study is on the analysis of capillary pressure effects on well test data. Ignoring the capillary pressure is one of the assumptions that have been applied in all multiphase well test analysis approaches. In this work we investigate the influences of capillary pressure on the analysis of pressure transient data in a solution gas drive reservoir and in a reservoir containing oil and water. Reservoir simulations were performed to generate pressure and saturation data for each case and the pressure responses and the fluids saturation distribution for drawdown and build-up tests for two cases with and without capillary pressure are compared. According to the results of this study, it has been concluded that the influences of capillary pressure on fluids saturation behavior in build-up test due to importance of capillary force than viscose force in this period is more noticeable. Though the effects of capillary pressure lead to differences in the fluids saturation behavior but the authors have not observed dissimilarity in the pressure responses affected by capillary pressure for draw down and build-up test in the both reservoirs under study.

Original languageEnglish
Pages (from-to)1808-1814
Number of pages7
JournalPetroleum Science and Technology
Issue number21-22
Publication statusPublished - 21 Dec 2015


  • build-up
  • capillary pressure
  • fluid saturation
  • solution gas drive
  • well test

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Fuel Technology
  • Geotechnical Engineering and Engineering Geology
  • Energy Engineering and Power Technology


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