摘要
基于ANSYS软件的流固耦合分析方法,选取局部抽油杆、油管和采出液为研究对象,将采出液处理为牛顿流体,计算了不同偏心抽油杆在采出液作层流和湍流流动时的阻尼系数。计算结果表明,在抽油杆与油管同心、采出液作层流时,求得的阻尼系数与理论解的相对误差为0.60%,证明所建模型和求解方法的合理性;随着抽油杆偏心度的增加,油管内采出液压降和抽油杆阻尼系数均呈下降趋势,作用在抽油杆上的阻力也沿圆周方向不均匀分布,在环空宽间隙的速度梯度和阻力比窄间隙的大;当采出液作层流流动时,阻尼系数由同心时的0.127 4下降到偏心度50%时的0.119 5,而作湍流流动时,阻尼系数由同心时的0.316 9下降到偏心度50%时的0.261 3,为抽油杆下冲程阻力分析计算提供了理论依据。
This paper adopted fluid-solid coup.ling analysis method, and took the rod string, the well fluids and the oil tube as research objects, well fluids are assumed to be Newtonian fluids. When well fluids are laminar or turbulent, the damping factor of the different eccentric rod string was calculated respectively. The results shows that the numerical result of the laminar damping factor is in accord with the theoretical result and proportional error is 0.60 % ; with eccentricity of rod string increases, pressure losses of the well fluids and the damping factor of rod string decrea ses, damping force is non-uniform distribution along circumferential direction in the section of rod string, the velocity gradient and damping force of the eccentric rod string are higher in the wide annuli than that in the narrow annuli; when the well fluids are laminar, damping factor drops from 0. 1274 at eccentricity of 0 to 0. 1195 with the eccentricity of 50Y0 ; when the well fluids are turbulent, damping factor drops from 0. 3169 at eccentricity of 0 to 0. 2613 with eccentricity of 50%0. This paper can provide a theory basis to calculating the damping force of the eccentric rod string.
出处
《石油矿场机械》
2008年第1期1-5,共5页
Oil Field Equipment
基金
国家自然科学基金项目"旋转钻柱与钻井液耦合动力学分析方法研究"(10672037)
关键词
抽油杆
偏心度
环空流
阻尼系数
rod string
eccentricity
annular flow
damping factor
