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dc.contributor.authorNa, Wei
dc.contributor.authorJia, Jiabin
dc.contributor.authorYu, Xin
dc.contributor.authorFaraj, Yousef
dc.contributor.authorWang, Qiang
dc.contributor.authorMeng, Ying-feng
dc.contributor.authorWang, Mi
dc.contributor.authorSun, Wantong
dc.identifier.citationWei, N., Jia, J., Yu, X., Faraj, Y., Wang, Q., Meng, Y., Wang, M. (2015). Imaging of gas-liquid annular flows for underbalanced drilling using Electrical Resistance Tomography. Flow Measurement and Instrumentation, 46, 319-326en_US
dc.description.abstractThe underbalanced drilling technique, which is also known as managed-pressure drilling, is playing an important role in oil and gas sector, as it reduces common conventional drilling problems such as minimal drilling rates and formation damage, differential sticking and lost circulation. Flow regime monitoring is one of the key topics in annular multiphase flow research, particularly for underbalanced drilling technique. Prediction of the prevailing flow regime in an annulus is of particular importance in the design and installation of underbalanced drilling facilities. Especially, for establishing a suitable pressure drop model based on the characteristics of the active flow regime. The methods of flow regime prediction (or visualisation) in an annulus that are currently in use are very limited, this is evidently due to poor accuracy or they are simply not applicable to underbalanced drilling operation in practice. Therefore, this paper presents a monitoring method, in which Electrical Resistance Tomography (ERT) is used to rapidly image the prevailing flow regime in an annulus with a metallic inner pipe. Experiments were carried out using an air–waterflow loop with a test section 50 mm diameter flow pipe. The two-phase air–waterflow regimes are visualised in the upward vertical annulus with a radius ratio (r/R) 0.4.This paper highlights the visualisation results of only three flow regimes, namely bubble flow, transitional bubble-slug flow and slug flow. The flow regimes are visualised through axial images stacked from50 mm diameter-pixels of 2D tomograms reconstructed with the Conjugate Gradient Method (SCG). Gas volume fraction profiles within the annular flow channel are also illustrated. The profiles are extracted using the Modified Sensitivity coefficient Back-Projection (MSBP) method with a sensitivity matrix generated from a realistic phantom in the finite element method software. The results are compared with visual observations (e.g. photographs) of the active flow regime at the time of ERT measurements.en_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.subjectUnderbalanced drilling techniqueen_US
dc.subjectAnnular flowen_US
dc.subjectFlow regimeen_US
dc.subjectElectrical resistance tomographyen_US
dc.subjectFlow regime visualisationen_US
dc.titleImaging of gas–liquid annular flows for underbalanced drilling using electrical resistance tomographyen_US
dc.contributor.departmentUniversity of Chester; University of Leeds; University of Edinburgh; Southwest Petroleum University (China)en_US
dc.identifier.journalFlow Measurement and Instrumentationen_US
rioxxterms.funderState Key Laboratory of Oil and Gas Geology and Exploration at Southwest Petroleum University (China) (PLN1119); National Natural Science Foundation of China (51204140, L1322021 and 51334003)en_US
rioxxterms.identifier.projectState Key Laboratory of Oil and Gas Geology and Exploration at Southwest Petroleum University (China) (PLN1119); National Natural Science Foundation of China (51204140, L1322021 and 51334003)en_US

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Attribution-NonCommercial-NoDerivatives 4.0 International
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