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Multi-phase metering device for oilfield applications

  • US 9,804,108 B2
  • Filed: 11/18/2013
  • Issued: 10/31/2017
  • Est. Priority Date: 10/13/2010
  • Status: Active Grant
First Claim
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1. A method of measuring the relative quantity of components in a high temperature and pressure fluid using nuclear magnetic resonance (NMR) relaxometry in an NMR pressure tube having a magnetic field, comprising the steps of:

  • a) calibrating the NMR pressure tube with a pure water sample by putting a pure water sample within the NMR pressure tube and applying an electromagnetic field to the pure water sample and recording a signal response using an NMR coil thereby providing a pure-water calibration curve;

    b) calibrating the NMR pressure tube with a pure oil sample by putting a pure oil sample within the NMR pressure tube and applying an electromagnetic field to the pure oil sample and recording a signal response using the NMR coil thereby providing a pure-oil calibration curve;

    c) introducing an at least two-component mixture into the NMR pressure tube;

    d) measuring relaxation spectra of the mixture in the NMR pressure tube by applying an electromagnetic field to the mixture and recording a response using the NMR coil; and

    e) calculating, using a processor, a quantity of oil and water in the at least two-component mixture by fitting the mixture relaxation spectra of step d) to a linear combination of the pure-water and pure-oil calibration curves of steps a) and b).

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