Tromp Rutger R, Cerioni Lucas M C
KROHNE New Technologies, Kerkeplaat 12, 3313 LJ Dordrecht, The Netherlands.
Department of Applied Physics, Eindhoven University of Technology, Den Dolech 2, 5600 MB Eindhoven, The Netherlands.
Molecules. 2021 Jun 2;26(11):3349. doi: 10.3390/molecules26113349.
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.
对于一系列过程工业，特别是与石油相关的行业而言，需要使用运行稳健、低成本的实时系统进行多相流计量，该系统要能在广泛的产量和流体特性范围内提供准确测量。尤其是现场可能遇到的各种各样的多相流型，在计量精度方面带来了挑战。最近，低场磁共振（MR）测量技术已被引入作为石油行业的一种可行解决方案。在这项工作中，我们使用MR技术研究气液两相水平流。我们表明，应用于多相流的低场MR技术有能力使用恒定梯度低翻转角CPMG（LFA-CPMG）脉冲序列测量瞬时持液率和液体流速。LFA-CPMG允许对持液率和液体流速之间的相关性进行代表性采样，从而能够表征多相流型。基于此方法的流量测量能够在较宽的平均气体和液体流速动态范围内，以与水平管道流中观察到的多相流型无关的精度确定液体流速。
