基于响应面法的小型井下油水分离器操作参数优化

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Cao Yanfeng，Qiu Hao，Wen Min，et al.Operating parameter optimization of small downhole oil-water separato based on the response surface method [J]. China Petroleum Machinery，2O25，53（5）：125-132.

关键词：油水分离器；响应面法；操作参数；结构优化；分离效率；数值模拟中图分类号：TE925文献标识码：A DOI：10.12473/CPM.202405023

Operating Parameter Optimization of Small Downhole Oil-Water Separator Based on the Response Surface Method

Cao Yanfeng' Qiu Hao' Wen Min1 Wang Tong² Zhao Junwei²Zou Minghua1 Pan Hao （1. CNOOC Research Institute Co.，Ltd.；2.China Oilfield Services Limited）

Abstract：The oil-water separator can effectively separate oil-water mixture，and also improve production efficiency，alleviate environmental pollution，and reduce production costs.To further improve the eficiency of the oil-water separator and reduce the overflow pressure loss， taking a smalldownhole oil-water separator as an example，basedon the response surface method，the mathematical relations between three operating parameters（oil phase density，treatment capacity and diversion ratio）and separation eficiency or pressure drop were established， the separate influence of oil phase density，treatment capacity and diversion ratio on separation eficiencyand pressure drop wasanalyzed，and their interactive relationships were discussed.Finally，the optimal combination of operating parameters was determined，and the response model was verified.The results show thatthe determination coefficient for linear regression R2 is O.972 9 and O. 991 1 respectively in variance analysis and significance test， indicating a good correlation of the response model. When the oil phase density is 800kg/m3 ，the incoming fluid treatment capacity is 1.413m3/h ， and the diversion ratio is 39.419% ，the separation effect is optimal. The separation efficiency increases from 79.56% to 96.37% after optimization of operating parameters. The volume fraction of theoil phase near the undertow of the separatoris obviously reduced after optimization，and that near the overflow （oil phase outlet）is increased by 5 percentage points.The research results and the proposed method provide guidance for the structural optimization and field application of downhole oil-water separators.

Keywords： oil-water separator; response surface method； operating parameter； structural optimization; separation eficiency；numerical simulation

0引言

2023年，中国油气产量当量超3.9亿t，连续7年保持千万吨级快速增长，年均增幅达到1170万t，不断鞭策着采油技术的发展[1]，而促进井下油水分离技术朝高效、稳定、小型化、低成本、智能化的方向发展[2]。（剩余12817字）