The measurement of component ratios in multiphase systems using alpha -ray attenuation

Abouelwafa, M. Sami A.; Kendall, E.J.M.

doi:10.1088/0022-3735/13/3/022

Cited by 91 publications

(31 citation statements)

References 3 publications

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“…There are already some measurement methods for twophase flow such as microwave attenuation [2], radiation attenuation [3], process tomograph [4], correlation technology [5], single-phase flow meter with models [6], ultrasonic technique [7] and so on. Cross-correlation technique as an important method of flowrate measurement receives great attention in the field of multi-phase flow [8] [9].…”

Section: Introductionmentioning

confidence: 99%

A measurement method of slug flow velocity of gas-liquid two-phase flow in horizontal pipe

Zhang

Dong

2010

2010 IEEE Instrumentation &Amp; Measurement Technology Conference Proceedings

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Slug flow is an important flow regime of gas/liquid two-phase flow. The parameters measurements of slug flow are of great importance in scientific and engineering field. Local crosscorrelation method is put forward in this paper to make the mixed velocity measurement of slug flow. Different from normal cross-correlation method, this local cross-correlation make direct use of electrode voltage data and gives detail velocity information of the cross-section. According to the electrode distribution in the pipe cross-section, the excitation manners have been sorted into 3 kinds and measured electrodes have been cut into 9 sorts. A static experiment is carried out to testify and concretely analyze the sensitivity difference of different excitation manners and different located measuring electrodes. Results of static experiment verify the above sorting manner and show that different excitation manner and different measured area has its own apparent data feature and. In this local cross correlation method, only selected electrode pairs instead of all electrodes as normal data process participate in excitation process. So the system efficiency has improved, and as a consequence the velocity resolution of cross correlation is improved. The dynamic experiment result shows the efficiency of this local crosscorrelation method and the experiment error is within 10%.

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Section: Introductionmentioning

confidence: 99%

A measurement method of slug flow velocity of gas-liquid two-phase flow in horizontal pipe

Zhang

Dong

2010

2010 IEEE Instrumentation &Amp; Measurement Technology Conference Proceedings

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“…Abouelwafa and Kendall were the first to propose the exploitation of a dual-energy gamma attenuation system to resolve the volume fractions of static oil, water and gas multiphase mixtures in a horizontal pipe and were able to yield gas fraction measurements were to within ±1%; and the oil and water fractions to within ±10% [8]. Li et al developed a modification algorithm for the dual-energy gamma attenuation technique that facilitated phase fraction determination to ±6% of their true values [9].…”

Section: Gamma Densitometrymentioning

confidence: 99%

“…For data points with identical gas and liquid phase mass flows, visual differentiation of the sensor responses between tests with different liquid phase water cuts was not possible as the gamma count fluctuations induced by the liquid phase water cut are much smaller compared to the gas-liquid variations. However, resolution of three-component multiphase mixture phase fractions through the application of dual-energy gamma attenuation is a wellestablished technique first described by Abouelwafa and Kendall [8] and has been successfully deployed as part of the measurement system in commercially multiphase meters [18].…”

Section: Signal Analysismentioning

confidence: 99%

Investigation of the exploitation of a fast-sampling single gamma densitometer and pattern recognition to resolve the superficial phase velocities and liquid phase water cut of vertically upward multiphase flows

Blaney

Yeung

2008

Flow Measurement and Instrumentation

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“…Further, the ferrous components in the object space will affect the applied field in a vectorially orthogonal way to the eddy-current effect, and can consequently be separately identified by a phase-sensitive demodulator using an orthogonal reference signal [9], [10]. Work on an IMM gamma-ray measuring system [11], [12] and an inherent dual energy X-ray tomography system [13] has also been published. IMM gamma-ray tomography is realizable.…”

Section: Multimodality Tomographymentioning

confidence: 99%

Multimodality tomography for multiphase hydrocarbon flow measurements

Hjertaker

Tjugum²,

Hammer

et al. 2005

IEEE Sensors J.

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Multimodality sensing is used for monitoring of multiphase hydrocarbon flow where there is a need to measure the quantity of oil, water and gas in a cross section of a pipe originating from an oil well. Information on the flow regime, i.e., the physical distribution of the hydrocarbon production constituents in the pipe cross section, is demanded. Expedient information concerning the productivity of the well, i.e., the quantity of oil, water and gas produced, the transport of multiphase flow and the upstream separation process can be provided by tomographic information. A dual modality tomograph (DMT), consisting of capacitance and gamma-ray sensors, has been developed at the University of Bergen. Characterization of the DMT has demonstrated feasibility in relation to the hydrocarbon flow application, but also shortcomings mainly relating to the performance of the capacitance sensor in water continuous phase, and the salinity dependence of the gamma-ray measurements. Research work has been conducted to further develop the DMT for hydrocarbon multiphase flow. The new developments include dual modality densitometry (DMD), where both mixture density and salinity are measured, and a water-cut independent high-frequency magnetic field sensor.Index Terms-Gamma-ray densitometry, high-frequency magnetic field, hydrocarbon multiphase flow, multimodality, tomography.

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The measurement of component ratios in multiphase systems using alpha -ray attenuation

Cited by 91 publications

References 3 publications

A measurement method of slug flow velocity of gas-liquid two-phase flow in horizontal pipe

A measurement method of slug flow velocity of gas-liquid two-phase flow in horizontal pipe

Investigation of the exploitation of a fast-sampling single gamma densitometer and pattern recognition to resolve the superficial phase velocities and liquid phase water cut of vertically upward multiphase flows

Multimodality tomography for multiphase hydrocarbon flow measurements

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