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    Effect of liquid invasion and capillary pressure on wireline formation tester measurements in tight gas reservoirs

    Access Status
    Fulltext not available
    Authors
    Andrews, J.
    Bahrami, H.
    Rezaee, M. Reza
    Mehmood, S.
    Salemi, H.
    Pourabed, H.
    Date
    2012
    Type
    Conference Paper
    
    Metadata
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    Citation
    Andrews, J. and Bahrami, H. and Rezaee, M.R. and Mehmood, S. and Salemi, H. and Pourabed, H. 2012. Effect of liquid invasion and capillary pressure on wireline formation tester measurements in tight gas reservoirs, in Proceedings of the Society of Petroleum Engineers (SPE) IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition, Jul 9-11 2012, pp. 76-85. Tianjin, China: SPE.
    Source Title
    Society of Petroleum Engineers - IADC/SPE Asia Pacific Drilling Technology Conference 2012 - Catching the Unconventional Tide: Winning the Future Through Innovation
    DOI
    10.2118/154649-MS
    ISBN
    9781622762729
    School
    Department of Petroleum Engineering
    URI
    http://hdl.handle.net/20.500.11937/25736
    Collection
    • Curtin Research Publications
    Abstract

    Wireline formation testing and measurement of true formation pressure can provide essential knowledge about the reservoir dynamic characteristics. In tight formations, a reliable determination of pressure and mobility gradients is challenging because of the tight nature of formation rock. Due to the very low reservoir permeability, the mud cake across wellbore is often ineffective in preventing filtrate invasion, thus causing the measured pressure to be higher than actual formation pressure as a result of supercharging effect. Wireline formation testing measurements are also influenced by the effects of filtrate invasion and capillary pressure, as the measured pressure is pressure of drilling fluid filtrate, the continuous phase present in the invaded region around wellbore. As a result, the measured pressure might be different to true formation pressure. This effect is more noticeable in tight gas reservoirs due to capillary pressure effect. This paper looks into estimation of true formation pressure and evaluates the effect of filtrate invasion damage and supercharging on wireline formation tester measurements in tight gas reservoirs. Numerical simulation approach is used to build the reservoir model based on data acquired from a tight gas reservoir. The model undergoes water injection followed by gas production from different testing points along the wellbore, and the corresponding pressure gradients are plotted to check for pressure matching with that of the formation fluid in the virgin region. The results indicate the significant effects of supercharging, reservoir characteristics, capillary pressure and liquid invasion damage on wireline formation pressure measurements in tight gas reservoirs.

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    • Effect of Liquid Invasion Damage and Supercharging on Wireline Formation Tester Measurements in Tight Gas Reservoirs
      Andrews, J.; Bahrami, Hassan; Rezaee, Reza; Porabed, H.; Mehmood, S.; Salemi, H. (2012)
      Wireline formation testing and measurement of true formation pressure can provide essential knowledge about the reservoir dynamic characteristics. In tight formations, a reliable determination of pressure and mobility ...
    • Phase trapping damage in use of water-based and oil-based drilling fluids in tight gas reservoirs
      Bahrami, H.; Rezaee, M. Reza; Saeedi, Ali; Murickan, G.; Tsar, M.; Jamili, A.; Mehmood, S.; Jamili, A. (2012)
      Low matrix permeability and significant damage mechanisms are the main signatures of tight gas reservoirs. During drilling and fracturing of tight formations, the wellbore liquid invades the tight formation, increases ...
    • Using relative permeability curves to evaluate phase trapping damage caused by water-based and oil-based drilling fluids in tight gas reservoirs
      Murickan, G.; Bahrami, Hassan; Rezaee, Reza; Saeedi, Ali; Tsar Mitchel, P. (2012)
      Low matrix permeability and significant damage mechanisms are the main signatures of tight-gas reservoirs. During the drilling and fracturing of tight formations, the wellbore liquid invades the tight formation, increases ...
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