The U-tube sampling methodology and real-time analysis of geofluids [electronic resource].
- Berkeley, Calif. : Lawrence Berkeley National Laboratory, 2009. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Additional Creators:
- Lawrence Berkeley National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- The U-tube geochemical sampling methodology, an extension of the porous cup technique proposed by Wood , provides minimally contaminated aliquots of multiphase fluids from deep reservoirs and allows for accurate determination of dissolved gas composition. The initial deployment of the U-tube during the Frio Brine Pilot CO₂ storage experiment, Liberty County, Texas, obtained representative samples of brine and supercritical CO₂ from a depth of 1.5 km. A quadrupole mass spectrometer provided real-time analysis of dissolved gas composition. Since the initial demonstration, the U-tube has been deployed for (1) sampling of fluids down gradient of the proposed Yucca Mountain High-Level Waste Repository, Armagosa Valley, Nevada (2) acquiring fluid samples beneath permafrost in Nunuvut Territory, Canada, and (3) at a CO₂ storage demonstration project within a depleted gas reservoir, Otway Basin, Victoria, Australia. The addition of in-line high-pressure pH and EC sensors allows for continuous monitoring of fluid during sample collection. Difficulties have arisen during U-tube sampling, such as blockage of sample lines from naturally occurring waxes or from freezing conditions; however, workarounds such as solvent flushing or heating have been used to address these problems. The U-tube methodology has proven to be robust, and with careful consideration of the constraints and limitations, can provide high quality geochemical samples.
- Published through SciTech Connect., 03/01/2009., "lbnl-1762e", International Applied Geochemistry Symposium (IAGS2009), Fredricton, New Brunswick, Canada, June 1-4, 2009., Freifeld, Barry; Perkins, Ernie; Underschultz, James; Boreham, Chris., and Earth Sciences Division
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