Article

International Journal of Thermophysics

, Volume 34, Issue 10, pp 1845-1864

Exploratory Characterization of a Perfluoropolyether Oil as a Possible Viscosity Standard at Deepwater Production Conditions of 533 K and 241 MPa

  • Hseen O. BaledAffiliated withNational Energy Technology Laboratory, Office of Research and Development, Department of EnergyDepartment of Chemical and Petroleum Engineering, University of Pittsburgh
  • , Deepak TapriyalAffiliated withNational Energy Technology Laboratory, Office of Research and Development, Department of EnergyURS, NETL Site Support Contractor
  • , Bryan D. MorrealeAffiliated withNational Energy Technology Laboratory, Office of Research and Development, Department of Energy
  • , Yee SoongAffiliated withNational Energy Technology Laboratory, Office of Research and Development, Department of Energy
  • , Isaac GamwoAffiliated withNational Energy Technology Laboratory, Office of Research and Development, Department of Energy
  • , Val KrukonisAffiliated withPhasex Corporation
  • , Babatunde A. BamgbadeAffiliated withNational Energy Technology Laboratory, Office of Research and Development, Department of EnergyDepartment of Chemical and Life Science Engineering, Virginia Commonwealth University
  • , Yue WuAffiliated withNational Energy Technology Laboratory, Office of Research and Development, Department of EnergyDepartment of Chemical and Life Science Engineering, Virginia Commonwealth University
  • , Mark A. McHughAffiliated withNational Energy Technology Laboratory, Office of Research and Development, Department of EnergyDepartment of Chemical and Life Science Engineering, Virginia Commonwealth University
    • , Ward A. BurgessAffiliated withNational Energy Technology Laboratory, Office of Research and Development, Department of Energy
    • , Robert M. EnickAffiliated withNational Energy Technology Laboratory, Office of Research and Development, Department of EnergyDepartment of Chemical and Petroleum Engineering, University of Pittsburgh Email author 

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Abstract

DuPont’s perfluoropolyether oil Krytox\(^{\textregistered }\) GPL 102 is a promising candidate for the high-temperature, high-pressure Deepwater viscosity standard (DVS). The preferred DVS is a thermally stable liquid that exhibits a viscosity of roughly 20 \(\hbox {mPa} \cdot \hbox {s}\) at 533 K and 241 MPa; a viscosity value representative of light oils found in ultra-deep formations beneath the deep waters of the Gulf of Mexico. A windowed rolling-ball viscometer designed by our team is used to determine the Krytox\(^{\textregistered }\) GPL 102 viscosity at pressures to 245 MPa and temperatures of 311 K, 372 K, and 533 K. At 533 K and 243 MPa, the Krytox\(^{\textregistered }\) GPL 102 viscosity is \((27.2 \pm 1.3)\,\hbox {mPa} \cdot \hbox {s}\). The rolling-ball viscometer viscosity results for Krytox\(^{\textregistered }\) GPL 102 are correlated with an empirical 10-parameter surface fitting function that yields an MAPD of 3.9 %. A Couette rheometer is also used to measure the Krytox\(^{\textregistered }\) GPL 102 viscosity, yielding a value of \((26.2 \pm 1)\,\hbox {mPa} \cdot \hbox {s}\) at 533 K and 241 MPa. The results of this exploratory study suggest that Krytox\(^{\textregistered }\, \hbox {GPL}\) 102 is a promising candidate for the DVS, primarily because this fluoroether oil is thermally stable and exhibits a viscosity closer to the targeted value of 20 mPa \(\cdot \) s at 533 K and 241 MPa than any other fluid reported to date. Nonetheless, further studies must be conducted by other researcher groups using various types of viscometers and rheometers on samples of Krytox GPL\(^{\textregistered }\) 102 from the same lot to further establish the properties of Krytox GPL\(^{\textregistered }\) 102.

Keywords

Couette rheometer Deepwater viscosity standard High pressure Krytox\(^{\textregistered }\) oil Rolling-ball viscometer