Effects and Corrections for Mobile NMR Measurement

Deng, Feng; Xiao, Lizhi; Liu, Huabing; An, Tianlin; Wang, Mengying; Zhang, Zongfu; Xu, Wei; Cheng, Jiajie; Xie, Qingming; Anferov, V. P.

doi:10.1007/s00723-013-0462-x

Cited by 24 publications

(3 citation statements)

References 2 publications

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“…The fluid samples were force fed into the sample tube by piston or pump. Our previous articles have introduced the probe structure and effects of flow on NMR measurements …”

Section: Methodsmentioning

confidence: 99%

Molecular dynamics and composition of crude oil by low‐field nuclear magnetic resonance

Jia

Xiao

Wang

et al. 2016

Magnetic Reson in Chemistry

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Nuclear magnetic resonance (NMR) techniques are widely used to identify pure substances and probe protein dynamics. Oil is a complex mixture composed of hydrocarbons, which have a wide range of molecular size distribution. Previous work show that empirical correlations of relaxation times and diffusion coefficients were found for simple alkane mixtures, and also the shape of the relaxation and diffusion distribution functions are related to the composition of the fluids. The 2D NMR is a promising qualitative evaluation method for oil composition. But uncertainty in the interpretation of crude oil indicated further study was required. In this research, the effect of each composition on relaxation distribution functions is analyzed in detail. We also suggest a new method for prediction of the rotational correlation time distribution of crude oil molecules using low field NMR (LF-NMR) relaxation time distributions. A set of down-hole NMR fluid analysis system is independently designed and developed for fluid measurement. We illustrate this with relaxation-relaxation correlation experiments and rotational correlation time distributions on a series of hydrocarbon mixtures that employ our laboratory-designed downhole NMR fluid analyzer. The LF-NMR is a useful tool for detecting oil composition and monitoring oil property changes. Copyright © 2016 John Wiley & Sons, Ltd.

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“…The fluid samples were force fed into the sample tube by piston or pump. Our previous articles have introduced the probe structure and effects of flow on NMR measurements …”

Section: Methodsmentioning

confidence: 99%

Molecular dynamics and composition of crude oil by low‐field nuclear magnetic resonance

Jia

Xiao

Wang

et al. 2016

Magnetic Reson in Chemistry

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“…1. Magnetization efficiency and signal loss rate control in the flow state (Deng et al 2013). In a continuous flow state, fluid magnetization time is limited, which may cause insufficient fluid magnetization and influence the signal-to-noise ratio of the collected signals and the latter data interpretation.…”

Section: Flow Effectsmentioning

confidence: 99%

A proposed NMR solution for multi-phase flow fluid detection

et al. 2019

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In the petroleum industry, detection of multi-phase fluid flow is very important in both surface and down-hole measurements. Accurate measurement of high rate of water or gas multi-phase flow has always been an academic and industrial focus. NMR is an efficient and accurate technique for the detection of fluids; it is widely used in the determination of fluid compositions and properties. This paper is aimed to quantitatively detect multi-phase flow in oil and gas wells and pipelines and to propose an innovative method for online nuclear magnetic resonance (NMR) detection. The online NMR data acquisition, processing and interpretation methods are proposed to fill the blank of traditional methods. A full-bore straight tube design without pressure drop, a Halbach magnet structure design with zero magnetic leakage outside the probe, a separate antenna structure design without flowing effects on NMR measurement and automatic control technology will achieve unattended operation. Through the innovation of this work, the application of NMR for the real-time and quantitative detection of multi-phase flow in oil and gas wells and pipelines can be implemented.

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“…Real-time wellhead metering systems are a concrete example of such inline process monitoring systems. Several MR technology-based research instruments have been developed for the petroleum industry, showing specific advantages of low-field MR technology when applied to multiphase flow measurement [ 1 , 9 , 10 , 11 , 12 ]. In this article, we show that a fully integrated multiphase flow meter [ 13 ] using low-field MR technology can act as a smart and robust measurement platform that has a large dynamic range in terms of produced volumes and associated multiphase flow profiles.…”

Section: Introductionmentioning

confidence: 99%

Multiphase Flow Regime Characterization and Liquid Flow Measurement Using Low-Field Magnetic Resonance Imaging

Tromp

Cerioni²

2021

Molecules

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Multiphase flow metering with operationally robust, low-cost real-time systems that provide accuracy across a broad range of produced volumes and fluid properties, is a requirement across a range of process industries, particularly those concerning petroleum. Especially the wide variety of multiphase flow profiles that can be encountered in the field provides challenges in terms of metering accuracy. Recently, low-field magnetic resonance (MR) measurement technology has been introduced as a feasible solution for the petroleum industry. In this work, we study two phase air-water horizontal flows using MR technology. We show that low-field MR technology applied to multiphase flow has the capability to measure the instantaneous liquid holdup and liquid flow velocity using a constant gradient low flip angle CPMG (LFA-CPMG) pulse sequence. LFA-CPMG allows representative sampling of the correlations between liquid holdup and liquid flow velocity, which allows multiphase flow profiles to be characterized. Flow measurements based on this method allow liquid flow rate determination with an accuracy that is independent of the multiphase flow profile observed in horizontal pipe flow for a wide dynamic range in terms of the average gas and liquid flow rates.

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Effects and Corrections for Mobile NMR Measurement

Cited by 24 publications

References 2 publications

Molecular dynamics and composition of crude oil by low‐field nuclear magnetic resonance

Molecular dynamics and composition of crude oil by low‐field nuclear magnetic resonance

A proposed NMR solution for multi-phase flow fluid detection

Multiphase Flow Regime Characterization and Liquid Flow Measurement Using Low-Field Magnetic Resonance Imaging

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