发明名称 |
METHOD OF INTERPRETING NMR SIGNALS TO GIVE MULTIPHASE FLUID FLOW MEASUREMENTS FOR A GAS/LIQUID SYSTEM |
摘要 |
A method for assessing a gas phase in a flowing multi-phase fluid comprises flowing the fluid through magnetic resonance and pre-polarization modules and applying to the fluid a radio-frequency pulse sequence at least once with and at least once without a magnetic field gradient. The method further includes measuring an NMR signal. The method also includes using a calibration between the ratio of slope and intercept of the NMR signal and flow velocity for at least one non-gas phase with the gradient applied to determine that phase's velocity. A calibration between the signal intensity of the liquid phases as function of flow velocity is used, with and without gradient, to correct the gradient-induced attenuation of the liquid signals and to calculate a gradient-corrected signal intensity of the liquid phases without a magnetic field gradient. Additionally, the method includes subtracting the gradient-corrected signal intensity from the NMR signal to calculate the volumetric fraction of the liquid phase. |
申请公布号 |
CA2932002(A1) |
申请公布日期 |
2015.06.18 |
申请号 |
CA20142932002 |
申请日期 |
2014.12.05 |
申请人 |
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V. |
发明人 |
APPEL, MATTHIAS;FREEMAN, JOHN JUSTIN |
分类号 |
G01F1/716 |
主分类号 |
G01F1/716 |
代理机构 |
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代理人 |
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地址 |
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