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Title: Non-Radioactive Multiphase Flowmeter for Quantifying Solid Particles Entrained in Fluid Flow
Author: Cornelius Emeka Agu, Evgeniy Tantserev, Arne Tobias Elve, Audun Aspelund
Source: 2021 North Sea Flow Measurement Workshop
Year Published: 2021
Abstract: Knowledge of solid flow rate or solid fraction in a multiphase flow is essential for management and controlling of the related operational challenges in Oil & Gas companies. For example, the production of sand particles in an aging well can lead to pipeline blockage and erosion. The concentration of drilling cuttings above the threshold may result in poor circulation of drilling fluid. In this paper, ABBON AS proposes an approach by which a non-radioactive multiphase meter can be used to measure the flowrate of solid particles entrained in a fluid flow. The measurement principle and approach proposed are similar to those used in the ABBON 3PM but with additional pressure loss measurement to account for the solid phase loading. To ensure proper splitting of flows into individual rates, this paper also reports the investigation carried out on verification of the response of the impedance sensors under fluid-solid environment using clay particles of density 1855 kg/m3 and different mean particle sizes, 700, 1200 and 5000 m. The fluids used in the test include air, oil with permittivity of 2.2 and water with three different salinities in the range, 1 - 15%. The results confirm that both the capacitive and conductive sensors respond appropriately to solids entrained in the fluids, which also agrees with the classical mixing models proposed to use in this metering concept. Furthermore, theoretical error analysis shows that the uncertainties in predicting the mixture density and solid flowrate over the GVF range, 1 - 100% lie below 5% and 10%, respectively. In a fluid-solid mixture with no gas, the errors can be significantly reduced to 1.5% and 7.5%, respectively.

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