基于正交试验的井下气液分离器结构优化设计

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关键词：高含气井；气液分离器；数值模拟；敏感性分析；分离效率；正交试验中图分类号：TE377文献标识码：A DOI：10.12473/CPM.202410001

Abstract：To address the issue of low separation efficiency in downhole helical gas-liquid separator during the production of gas-rich wells （with gas content of 30%～50% ），based on gas-liquid two-phase flow theory， numerical simulation method was used to build a finite element model of conventional downhole gas-liquid separator.According to actual high-gas-cut wellconditions in an oilfield，sensitivityanalysis was performed on liquid volume fraction distribution，gas-liquid two-phase pressure and velocity，and separation eficiency under varying impeller parameters（pitch，outer diameter，and number of turns）.Based on orthogonal experiment optimization results of impeler parameters，a new two-stage downhole gas-liquid separator was developed.The study results showthatfortheconventional downhole gas-liquid separator，the separation eficiencyoftheseparator goes upward as the outer diameter of the impeler increases，and first increases and then decreases as the pitch and number of turnsof impeler increase.The totallength of the newtwo-stage downholegas-liquid separatoris1252mm.The structure adopts acombinationof two-stage impellers：the upper impeller is a helical booster rotor，with apitch of 158.22 mm，a number of turns of 2.25，and an outer diameter of 99. 06mm ; the lower impeller is ahelical separation rotor，adopting a 4-rotor design，with a pitch of 178.22mm ，a number of turns of 2.75，and an outer diameter of 89.O6 mm.The outer diameterof the transition separation rotor adopts a gradient design.After optimization，the separation efficiency is increased from 78.5% to 86.2% ，an increase of 9.8% . The study methods and results provide references for parameter optimization and design of downhole gas-liquid separatorin gas-rich wells.

Keywords：gas-rich well；gas-liquid separator；numerical simulation；sensitivity analysis；separation efficiency；orthogonal experiment

0 引言

随着油气开采的进行，油气储层能量释放和地层压力降低，使油气井由自喷转为人工举升[1]，气液分离器作为人工举升设备可靠运行的关键工具之一，其分离效率直接影响油气开采效率。（剩余11133字）