Data fusion in dual-mode tomography for imaging oil–gas two-phase flow

Wang, Qi; Wang, Huaxiang; Zhang, Mu; Liu, Hongli

doi:10.1016/j.flowmeasinst.2014.03.003

Cited by 27 publications

(10 citation statements)

References 30 publications

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“…The original flow characters could be reflected more accurately, since the flow filed could stay undisturbed. Such as the use of ultrasonic guided waves for liquid composition determination [10], process tomography technology by electrical capacitance or electrical resistance for cross section character evaluation [11], imaging method for void fraction measurement [12]. Considering the severe measurement conditions of in oil and gas industry, the gamma-ray method which has characteristics of strong anti-interference capability and excellent directivity and penetration is widely used in a multiphase flow or the wet gas measurement of a single well [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

High-gas-volume-fraction measurement of wet gas using a gamma-ray sensor at different mounting angles

Pan¹,

Weizheng²,

Guangxin³

et al. 2021

Meas. Sci. Technol.

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With the development of oil and gas fields in the South China Sea, the focus is on measurement accuracy pertaining to wet gas around subsea wellheads. Owing to limited space and safety with regard to subsea installations, the horizontal installation of a wet gas meter is preferred. However, the phase distribution of wet gas with a high gas volume fraction (GVF) in a horizontal pipe is non-homogeneous and causes uncertainty in the measurement of void fraction using the single-beam gamma-ray method. To resolve this issue, this study aims to determine a sensor position to best estimate the gas void fraction of a wet gas flow. An experiment was designed and conducted to study measurement results by mounting a gamma-ray sensor at different angles. A computational fluid dynamics numerical simulation was performed to investigate the phase distribution at the Venturi throat, and the resulting GVF based on the slip ratio and void fraction was used for comparative analysis considering the input void fraction as reference. The comparative analysis shows that the measurement errors at mounting angles of 0° and 90° are large in numbers, and optimal results are achieved at 45°. Therefore, to obtain accurate measurement results in horizontal pipes, an optimal mounting angle of gamma-ray source and detector relative to horizontal is recommended for the single-beam gamma-ray void fraction measurement method.

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Section: Introductionmentioning

confidence: 99%

High-gas-volume-fraction measurement of wet gas using a gamma-ray sensor at different mounting angles

Pan¹,

Weizheng²,

Guangxin³

et al. 2021

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…For example, the positron emission computed tomography (PET)/CT [19], magnetic resonance imaging (MRI)/CT [20] and Ultrasound/MRI [21] have been successfully used in medical diagnosis. The ultrasound tomography (UT)/electrical capacitance tomography (ECT) [22], CT/ECT [23], Gamma Densitometry Tomography (GDT)/EIT [24] have been widely used in multiphase flow process parameters detection. Thus, the dual-modality imaging technique is promising to improve the EIT imaging accuracy by adding the prior information from the other imaging modality.…”

Section: Introductionmentioning

confidence: 99%

A Lagrange-Newton Method for EIT/UT Dual-Modality Image Reconstruction

Liang

Ren

Zhao

et al. 2019

Sensors

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An image reconstruction method is proposed based on Lagrange-Newton method for electrical impedance tomography (EIT) and ultrasound tomography (UT) dual-modality imaging. Since the change in conductivity distribution is usually accompanied with the change in acoustic impedance distribution, the reconstruction targets of EIT and UT are unified to the conductivity difference using the same mesh model. Some background medium distribution information obtained from ultrasound transmission and reflection measurements can be used to construct a hard constraint about the conductivity difference distribution. Then, the EIT/UT dual-modality inverse problem is constructed by an equality constraint equation, and the Lagrange multiplier method combining Newton-Raphson iteration is used to solve the EIT/UT dual-modality inverse problem. The numerical and experimental results show that the proposed dual-modality image reconstruction method has a better performance than the single-modality EIT method and is more robust to the measurement noise.

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“…Tomography has been used in process industry for decades and is now a very popular imaging technology for multi-component media inside industrial pipes and vessels, including gasliquid, liquid-liquid, liquid-solid and gas-solid media [1][2][3][4]. Although there are many tomography types and modalities available, none of them is a universal choice able to image all kinds of processes [4][5][6]. Overall, electrical tomography (ET) and ultrasonic tomography (UT) are among the most widely applied modalities.…”

Section: Introductionmentioning

confidence: 99%

Contactless electrical impedance and ultrasonic tomography: correlation, comparison and complementarity study

Jiang

Soleimani

Wang

2019

Meas. Sci. Technol.

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Electrical tomography (ET) and ultrasonic tomography (UT) techniques are effective and promising super-sensing tools with uses in many industrial process applications. They can create internal mapping images of both electrical and mechanical properties from measurements at the exterior boundaries of domains of interests. There are several different types of ET methods and different modes of UT imaging. Here we focus on contactless ET and contactless UT imaging for liquid masses, enabling fully non-intrusive, integrated mechanical and electrical imaging because direct contact to the process material is often a major limiting factor. ET is sensitive to the distribution of dielectric parameters inside the region of interest, and the highest sensitivity often lies near the outer surface of the boundary. UT has very good responses to the intersections of different phases of materials and has the highest resolution in the central area. Capacitively coupled electrical impedance tomography (CCEIT) is proposed as a contactless ET technique. This work investigates CCEIT based on phase measurements of the electrical impedance between transmitting and receiving electrodes, and UT based on the transmission mode, measuring the time-of-flight between the transmitted signal and the first received signals. A combined sensor which comprises a 16-electrode CCEIT array and a 16-transducer UT array is developed. Experimental results show the performances of the two tomography systems and their dual modality combination. This work highlights various aspects of the correlation, comparison and complementarity between these two contactless imaging techniques. Inclusion material characterization and identification is demonstrated using this novel dual modality.

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Data fusion in dual-mode tomography for imaging oil–gas two-phase flow

Cited by 27 publications

References 30 publications

High-gas-volume-fraction measurement of wet gas using a gamma-ray sensor at different mounting angles

High-gas-volume-fraction measurement of wet gas using a gamma-ray sensor at different mounting angles

A Lagrange-Newton Method for EIT/UT Dual-Modality Image Reconstruction

Contactless electrical impedance and ultrasonic tomography: correlation, comparison and complementarity study

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