井下多级并联微旋流器流量均布性分析及优化  

Uniform Flux Analysis and Optimization of Downhole Multistage Parallel Micro Cyclones

作　　者：赵立新[1,2] 罗华鑫 刘琳 蒋明虎 Zhao Lixin;Luo Huaxin;Liu Lin;Jiang Minghu(School of Mechanical Science and Engineering,Northeast Petroleum University;Heilongjiang Key Laboratory of Petroleum and Petrochemical Multi-phase Media Treatment and Pollution Prevention)

机构地区：[1]东北石油大学机械科学与工程学院 [2]黑龙江省石油石化多相介质处理及污染防治重点实验室

出　　处：《石油机械》2024年第9期81-88,共8页China Petroleum Machinery

基　　金：国家自然科学基金区域创新发展联合基金重点支持项目“同井注采井筒关键湍流场域离散相运聚机理及动力学行为研究”(U21A20104);黑龙江省自然科学基金重点项目“多场多相耦合强化分离机理及性能研究”(ZD2020E001);大庆市指导性科技计划项目“微旋流器对离散相效能增强机理及分离性能研究”(zd-2023-34);东北石油大学国家基金培育基金项目“微旋流器对微细颗粒分离机理及特性研究”(2023-GPL-10)。

摘　　要：采用多级并联微旋流器的方式实现井下油水分离,不仅可以提高采出液含油体积分数,同时能够满足高处理量要求。在井下工作时,若油水分离设备与套管间形成的油套环空流场结构不合理,会导致每级微旋流器组得到的流量不均匀,影响多级并联微旋流器分离装置的整体分离性能。基于数值模拟和响应面Box-Behnken试验设计方法,构建了分离装置和套管形成的油套环空流体域的结构参数与流量不均匀系数、最大压力损失间的数学模型,并对模型的有效性进行了验证。分析结果表明:当每级入口间距为400 mm、每级入口角度为90°、总级数为3级、出入口面积比为0.5时,优化后的流量不均匀系数从0.02653减小到0.01289,降幅达51.41%;与初始结构对比,当雷诺数在3000~8000范围内变化时,优化结构的流量不均匀系数在各种工况下比较稳定,最大可减小0.04708,最小为0.01125;优化后的结构呈现了较好的流量均匀分配性能及适应性。所得结果可为井下多级并联微旋流器的设计及应用提供参考。The use of multistage parallel micro cyclones to achieve downhole oil-water separation can increase the oil volume fraction of the produced liquid,and also meet the requirements of high treatment capacity.When working in the well,if the structure of the flow field in tubing-casing annulus formed between the oil-water separation equipment and the casing is unreasonable,the flow rate obtained by each stage of the micro cyclone group is uneven,which affects the overall separation performance of the multistage parallel micro cyclone separation device.In this paper,based on numerical simulation and response surface Box-Behnken experimental design method,a mathematical model was constructed for the structural parameters,flow nonuniformity coefficient and maximum pressure loss of the fluid domain in tubing-casing annulus formed by the separation device and casing,and the effectiveness of the model was verified.The results show that when the inlet spacing and angle of each stage of micro cyclone are 400 mm and 90°respectively,the total number of stages is 3 and the ratio of inlet and outlet area is 0.5,and the optimized flow nonuniformity coefficient decreases from 0.02653 to 0.01289,with a decrease of 51.41%.Compared with the initial structure,when the Reynolds number varies between 3000 and 8000,the flow nonuniformity coefficient of the optimized structure is relatively stable under various working conditions,with a maximum reduction of 0.04708 and a minimum of 0.01125.The optimized structure exhibits good uniform flux performance and adaptability.The analysis results provide reference for the design and application of downhole multistage parallel micro cyclones.

关 键 词：井下油水分离 多级并联 微旋油器 油套环空 流量均布 结构优化 

分 类 号：TE934[石油与天然气工程—石油机械设备]