Abstract
Most multi-phase pumps used in crude oil production have been developed to satisfy certain pressure specifications. In the design of these pumps, the flow characteristics of the posterior stage are different from those of the prior stage. For this reason, the design of the second stage needs to be supplemented. To optimize performance in this stage, multi-objective optimization to simultaneously increase pressure and efficiency is reported in this article. Flow analyses of the single and multiple phases of the multi-phase pump were conducted by solving three-dimensional steady Reynolds-averaged Navier–Stokes equations. For the numerical optimization, two design variables related to the blade inlet angle were selected. The impeller and the diffuser blades were optimized using a systematic optimization technique combined with a central composite method and a hybrid multi-objective evolutionary algorithm coupled with a surrogate model. The selected optimal model yielded better hydrodynamic performance than the base model, and reasons for this are investigated through internal flow field analysis.
Highlights
IntroductionMulti-phase pumps constitute core machinery in the offshore plant industry
Multi-phase pumps constitute core machinery in the offshore plant industry. They are installed in oil wells to pressurize and transport crude oil
Most multi-phase pumps used in such oil wells have been designed to function in multiple stages to satisfy these pressure specifications [1,2]
Summary
Multi-phase pumps constitute core machinery in the offshore plant industry. They are installed in oil wells to pressurize and transport crude oil. Most multi-phase pumps used in such oil wells have been designed to function in multiple stages to satisfy these pressure specifications [1,2]. Inflow characteristics need to be considered according to stage while designing multistage pumps. To maximize the performance of multi-phase pumps, multi-objective to to maximize the performance of multi-phase pumps, multi-objective optimization tooptimization simultaneously simultaneously improve their pressure and efficiency is proposed and tested. The second stage in improve their pressure and efficiency is proposed and tested. When multistage designing multistage pumps, this angles discordance in be flow and bladeThe angles needs to be considered. Thecoupled causes of the aperformance improved the base model are thencompared analyzed with thecomparisons base model are internal analyzedflow through through of their fields.comparisons of their internal flow fields
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