Effects of production, PVT and pipe roughness on multiphase flow correlations in gas wells
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ORIGINAL PAPER-PRODUCTION ENGINEERING
Effects of production, PVT and pipe roughness on multiphase flow correlations in gas wells Mohamed A. Abd El‑Moniem1 · Ahmed H. El‑Banbi2 Received: 28 February 2020 / Accepted: 22 June 2020 © The Author(s) 2020
Abstract The importance of gas production has increased as gas represents a clean source of energy. We studied different multiphase flow correlations for gas wells. We collected large database for bottomhole flowing pressure for different flow conditions and well configurations. In total, 32 gas wells were selected and our target was to study the effect of multiphase flow correlations input parameters on the accuracy of the predicted pressure drop. Several important multiphase correlations input parameters were selected for this study. These include condensate to gas ratio (CGR) and water to gas ratio (WGR) which represent the production conditions, API and specific gravity of surface gas (Ɣg) which represent PVT properties and the tubing roughness (ε) which represents the tubing condition. Our method was based on changing the values of these selected parameters by a percentage from its original value and determining the new predicted bottomhole flowing pressure. Consequently, we deter‑ mined the new error compared to the actual measured bottomhole pressure. We performed 352 cases, and we could obtain the effect of the different parameters on both pressure drop calculations and the selection of the best correlation. Guidelines were developed to explain which parameters are more important to be measured accurately for different conditions. Keywords Input data error · Multiphase flow correlations · Gas wells · Nodal analysis Abbreviations API American Petroleum Institute (density measurement) BHT Bottomhole temperature CGR Condensate gas ratio DE Deviation error DI Deviation index MAPD Mean absolute percent deviation MAPE Mean absolute percent error MAPE1 Mean absolute percent error for maximum error MAPE2 Mean absolute percent error for the base run psi Pound force per square inch RE Relative error scf Standard cubic foot WGR Water gas ratio List of symbols bbl Barrel d Diameter
D Day D Deviated f Friction factor °F Degrees Fahrenheit H High L Low M Medium m Mixture n Number of correlations Pwf Bottomhole flowing pressure qg Gas flow rate V Vertical v Velocity % Percentage Greek letters ρ Density Ɣg Gas specific gravity ε Tubing roughness
* Mohamed A. Abd El‑Moniem [email protected] 1
Amal Petroleum Company, Cairo, Egypt
The American University in Cairo, Cairo, Egypt
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13
Vol.:(0123456789)
Journal of Petroleum Exploration and Production Technology
Introduction Gas reservoirs are one of the most important sources for energy. One of the roles of reservoir and production engi‑ neers is to maintain production from gas reservoirs and pro‑ vide accurate prediction of their performance. Wells modeling is used to model the different wells to predict the flow under new flow conditions. Nodal analysis is often used
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