摘要
旋流分离器在井下采油螺杆泵作用下会发生复杂的振动现象,对旋流分离器内部流场造成一定影响。为研究螺杆泵不同转速下旋流分离器内部流场的变化规律,以同井注采工艺中螺杆泵作用下的旋流分离管柱为研究对象,针对振动壁面旋流分离管柱结构及工作特点,基于计算流体动力学方法、计算固体力学方法以及流固耦合理论,建立流固耦合力学模型;利用流固耦合分析方法,对双螺杆泵转动条件下井下旋流分离管柱内速度场、油相分布、涡量及湍动能等流场特性进行分析。分析结果表明:随着螺杆泵转速升高,分离器内切向速度和轴向速度强度逐渐减弱,径向速度的不对称性逐渐加剧,转速的周期性变化还会造成径向速度场分布的偏移;螺杆泵不同转速下旋流分离器内部涡量分布不同,随着转速升高,溢流管以及锥段部分附近相关流场的涡旋明显增强;旋流器溢流口附近油相体积分数会随着螺杆泵转速的升高而减小;不同螺杆泵转动状态下,大颗粒油滴的分布不同。所得结果可为螺杆泵井下旋流分离同井注采系统的设计及螺杆泵的转速设定提供参考。
The cyclone separator would experience complex vibration under the action of downhole oil recovery screw pump,which has a certain impact on the internal flow field of the cyclone separator.In order to study the changes in the internal flow field of the cyclone separator under different rotation speeds of the screw pump,taking the cyclone separation string under the action of the screw pump in the injection-production technology of the same well as the research object,based on the structure and working characteristics of the vibrating wall cyclone separation string,the computational fluid dynamics method,the computational solid mechanics method and the fluid-solid coupling theory,a fluid-solid coupling mechanical model was built.Then,the fluid-solid coupling analysis method was used to analyze the flow field characteristics such as velocity field,oil distribution,vorticity and turbulence energy inside the downhole cyclone separation string under the rotating conditions of two-screw pump.The analysis results show that as the rotation speed of the screw pump increases,the tangential and axial velocity intensities inside the separator gradually decrease,the asymmetry of radial velocity gradually aggravates,and the cyclic variation of rotation speed would also cause a migration of radial velocity field distribution.The distribution of vorticity inside the cyclone separator varies at different rotation speeds of the screw pump.As the rotation speed increases,the vortices in the relevant flow fields near the overflow pipe and cone section are significantly enhanced.The oil phase volume fraction near the overflow outlet of the cyclone decreases with the increase of the rotation speed of screw pump.The distribution of large oil droplets varies under different rotational states of screw pump.The research results provide reference for the design of the downhole cyclone separation same well injection-production system and the setting of rotation speed of screw pump.
作者
赵立新
余帆
徐保蕊
金宇
蒋明虎
卢梦媚
Zhao Lixin;Yufan;Xu Baorui;Jin Yu;Jiang Minghu;Lu Mengmei(School of Mechanical Science and Engineering of Northeast Petroleum University;Heilongjiang Key Laboratory of Petroleum and Petrochemical Multi-phase Media Treatment and Pollution Prevention)
出处
《石油机械》
北大核心
2024年第7期98-106,共9页
China Petroleum Machinery
基金
国家自然科学基金区域创新发展联合基金项目“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)
东北石油大学人才引进科研启动经费资助项目“小直径圆管油水两相螺旋流场测量及分离机理研究”(2020KQ19)。
关键词
旋流分离管
油水分离
螺杆泵
流固耦合
流场分析
涡量
油相分布
cyclone separation pipe
oil-water separation
screw pump
fluid-solid coupling
flow field analysis
vorticity
oil distribution
