采出液黏度对旋流器性能影响的数值模拟
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摘要
井下两相旋流分离器能够适应井筒内空间狭小的操作工况,实现油水两相在井下快速分离,具有分离速度快、效率高、结构简单等优点,有效解决大量产出水无效循环的难题。对大庆油田采出液不同含聚浓度样本进行流变特性分析,基于计算流体动力学软件FLUENT,采用雷诺应力模型(RSM),模拟分析了采出液黏度变化对井下两相分离旋流器速度场(切向速度、轴向速度、径向速度)、压力损失和油水两相分离效率的影响。结果表明:含聚浓度300～1 100 mg/L采出液在旋流器内的表观黏度约为2.5～35 mPa·s,随黏度增加,切向速度降低,35 mPa·s时,其最大值降幅16%;黏度对分离效率影响较大,9 mPa·s时,油水分离效率急剧下降为47.9%。
The downhole two-phase hydrocyclone separator can adapt to the operating conditions of small space in the wellbore and realize the rapid separation of the oil-water two-phase in the well. It has the advantages of quick separation speed,high efficiency and simple structure and can effectively solve the difficult problem of the ineffective circulation of a large amount of produced water. The rheological characteristics of the samples with different polymer concentrations of the produced fluid in Daqing Oilfield were analyzed. Based on computational fluid dynamics software FLUENT,the effects of changes in viscosity of the produced fluid on the velocity field(tangential velocity,axial velocity,and radial velocity),pressure loss,and oil-water separation efficiency of the downhole two-phase separation hydrocyclone were simulated and analyzed using Reynolds stress model(RSM).The results show that the apparent viscosity of the produced fluid with a polymer concentration of 300～1 100 mg/L is about 2.5～35 mPa·s in the hydrocyclone. As the viscosity increases,the tangential speed decreases,with a maximum decrease of 16% at 35 mPa·s.The viscosity has a great influence on the separation efficiency. When the viscosity is 9 mPa·s,the oil-water separation efficiency dropped sharply to 47.9%.
The downhole two-phase hydrocyclone separator can adapt to the operating conditions of small space in the wellbore and realize the rapid separation of the oil-water two-phase in the well. It has the advantages of quick separation speed,high efficiency and simple structure and can effectively solve the difficult problem of the ineffective circulation of a large amount of produced water. The rheological characteristics of the samples with different polymer concentrations of the produced fluid in Daqing Oilfield were analyzed. Based on computational fluid dynamics software FLUENT,the effects of changes in viscosity of the produced fluid on the velocity field(tangential velocity,axial velocity,and radial velocity),pressure loss,and oil-water separation efficiency of the downhole two-phase separation hydrocyclone were simulated and analyzed using Reynolds stress model(RSM).The results show that the apparent viscosity of the produced fluid with a polymer concentration of 300～1 100 mg/L is about 2.5～35 mPa·s in the hydrocyclone. As the viscosity increases,the tangential speed decreases,with a maximum decrease of 16% at 35 mPa·s.The viscosity has a great influence on the separation efficiency. When the viscosity is 9 mPa·s,the oil-water separation efficiency dropped sharply to 47.9%.
引文
[1]徐保蕊,蒋明虎,赵立新.采出液黏度对三相分离旋流器性能的影响[J].机械工程学报,2017,53(8):175-182.
[2]王启民,冀宝发,隋军,等.大庆油田三次采油技术的实践与认识[J].大庆石油地质与开发,2001,20(2):1-8.
[3]詹亚力,杜娜,郭绍辉.我国聚合物驱采出水处理方法研究进展[J].油气田环境保护,2003,13(1):19-23.
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[5]蒋明虎,宫磊磊,徐保蕊,等.含气条件对井下油水分离旋流器性能影响的数值模拟[J].化工机械,2014,41(5):629-632.
[6]赵立新,宋鸽,徐保蕊,等.井下油水旋流分离两级串联管柱优化[J].石油机械,2015,43(10):76-80.
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[9]闫月娟,王尊策,徐艳,等.采出液粘度对井下旋流除砂器内流特性及分离性能的影响[J].化工机械,2014,41(4):505-509.
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[11]李福军,曹广胜,夏惠芬,等.聚合物溶液流变特性试验研究[J].石油钻采工艺,1997,19(2):72-75.
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[13]李子奈,叶阿忠.高等计量经济学[M].北京:清华大学出版社,2000.
[14]石玲,刘卫东,佟占祥.驱油用表面活性聚合物SLH-Ⅰ的水溶液流变特性[J].油田化学,2008(1):42-45.
[15]宫磊磊.采出液含气对井下油水旋流分离器的影响研究[D].大庆:东北石油大学,2015.
[16]Lixin Zhao,Minghu Jiang,Baorui Xu,et al.Development of a new type high-efficient inner-cone hydrocyclone[J].Chemical Engineering Research and Design,2012,90(12):2129-2134.
[17]琚选择.除油水力旋流器三维数值模拟研究[D].北京:中国石油大学,2008.
[18]Wesson G D Grady S A,Abdullah M,Kalu E E.Prediction of 10-mm hydrocyclone separation efficiency using computational fluid dynamics[J].Filtr.Sep.,2003,40:41-46.
[19]徐艳,张彦月,张井龙,等.基于LES方法的壁面旋转旋流分离器内流特性的研究[J].流体机械,2017,45(8):1-5.
[20]马艺,金有海,王振波.两种不同入口结构式旋流器内的流场模拟[J].化工进展,2009 28:497-501.
[21]袁惠新,严沁萍,李双双.操作参数对三相分离旋流器分离性能影响的研究[J].现代化工,2016,36(8):190-193.
[22]赵立新,赵宇,徐保蕊,等.基于正交的二次分离旋流器结构优选数值分析[J].流体机械,2015,43(5):15-18.
[2]王启民,冀宝发,隋军,等.大庆油田三次采油技术的实践与认识[J].大庆石油地质与开发,2001,20(2):1-8.
[3]詹亚力,杜娜,郭绍辉.我国聚合物驱采出水处理方法研究进展[J].油气田环境保护,2003,13(1):19-23.
[4]王增林,祝威.胜利油区含聚合物采出液处理技术[J].油气地质与采收率,2008,15(1):92-94.
[5]蒋明虎,宫磊磊,徐保蕊,等.含气条件对井下油水分离旋流器性能影响的数值模拟[J].化工机械,2014,41(5):629-632.
[6]赵立新,宋鸽,徐保蕊,等.井下油水旋流分离两级串联管柱优化[J].石油机械,2015,43(10):76-80.
[7]薛红兵,姚薇,夏福军.液-液旋流器处理注聚含油污水现场试验[J].油气田地面工程,1999,18(2):31-33.
[8]杨琳,梁政,田家林,等.粘度对液-液旋流器内部流场及分离效率影响的仿真分析[J].流体机械,2010,38(3):28-32.
[9]闫月娟,王尊策,徐艳,等.采出液粘度对井下旋流除砂器内流特性及分离性能的影响[J].化工机械,2014,41(4):505-509.
[10]董晶.含聚采出液流变特性及乳化特性研究[D].大庆:东北石油大学,2015.
[11]李福军,曹广胜,夏惠芬,等.聚合物溶液流变特性试验研究[J].石油钻采工艺,1997,19(2):72-75.
[12]刘伟.聚合物驱采出液油包水型乳状液性质研究[D].大庆:东北石油大学,2013.
[13]李子奈,叶阿忠.高等计量经济学[M].北京:清华大学出版社,2000.
[14]石玲,刘卫东,佟占祥.驱油用表面活性聚合物SLH-Ⅰ的水溶液流变特性[J].油田化学,2008(1):42-45.
[15]宫磊磊.采出液含气对井下油水旋流分离器的影响研究[D].大庆:东北石油大学,2015.
[16]Lixin Zhao,Minghu Jiang,Baorui Xu,et al.Development of a new type high-efficient inner-cone hydrocyclone[J].Chemical Engineering Research and Design,2012,90(12):2129-2134.
[17]琚选择.除油水力旋流器三维数值模拟研究[D].北京:中国石油大学,2008.
[18]Wesson G D Grady S A,Abdullah M,Kalu E E.Prediction of 10-mm hydrocyclone separation efficiency using computational fluid dynamics[J].Filtr.Sep.,2003,40:41-46.
[19]徐艳,张彦月,张井龙,等.基于LES方法的壁面旋转旋流分离器内流特性的研究[J].流体机械,2017,45(8):1-5.
[20]马艺,金有海,王振波.两种不同入口结构式旋流器内的流场模拟[J].化工进展,2009 28:497-501.
[21]袁惠新,严沁萍,李双双.操作参数对三相分离旋流器分离性能影响的研究[J].现代化工,2016,36(8):190-193.
[22]赵立新,赵宇,徐保蕊,等.基于正交的二次分离旋流器结构优选数值分析[J].流体机械,2015,43(5):15-18.