X-ray or gamma ray systems or devices – Specific application – Absorption
Patent
1996-10-11
1997-11-18
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Absorption
378 51, G01N 2306
Patent
active
056895402
ABSTRACT:
An x-ray generator provides a continuous bremsstrahlung photon spectrum for determining the water to liquid ratio in a mixture of oil/water/gas flowing through a pipe located a distance from the generator. A plurality of detectors measure photons passing along a beam path from the generator through the fluid. A detector is also provided to monitor the energy distribution of the generator. A time interval for measuring the output of each detector is established such that small changes in the gas to liquid ratio occur during this interval. An energy bin width is selected to provide a linear approximation of the water to liquid ratio. After binning the counts for each detector, a multi-phase flow characteristic such as the water to liquid fraction, liquid density, or liquid fraction along the beam path is determined.
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Santen et al., Photon Energy Selection for Dual Energy .gamma.- and/or X-ray Absorption Composition Measurements in Oil-Water-Gas Mixtures, Nuclear Geophysics, vol. 9, No. 3 (1995) pp. 193-202.
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Roach et al., Multiphase Flowmeter for Oil, Water and Gas in Pipelines Based on Gamma-ray Transmission Techniques, Nucl. Geophys., vol. 8, No. 3 (1994) pp. 225-242.
Rebgetz et al., Determination of the Volume Fractions of Oil, Water, and Gas by Dual Energy Gamma-ray Transmission, Nucl. Geophys., vol. 5, No. 4 (1991) pp. 479-490.
Becker Arthur J.
Stephenson Kenneth E.
Jeffery Bridgitte L.
Porta David P.
Schlumberger Technology Corporation
Smith Keith G. W.
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