摘要
为了提高径向水平井扩孔效率,将长圆喷嘴引入磨料射流扩孔技术,建立射流流场的流动控制方程,结合Real-izable k-ε模型对方程组进行求解,并将结果与锥形喷嘴射流结果进行对比。结果表明:长圆喷嘴射流具有一定的扩散性,且短轴剖面上的扩散角比长轴剖面上大;喷嘴内射流速度及出口速度随长宽比增大而减小,随出口直径增加而增加;在喷嘴入口速度和出口直径相同的情况下,长圆喷嘴出口速度小于锥形喷嘴;无因次喷距大于11.3时,长圆喷嘴外射流轴线速度大于锥形喷嘴的;射流出口断面宽度随喷距增大而增大,在相同条件下长圆喷嘴扩孔宽度大于锥形喷嘴,且射流具有自模性;数值计算结果与磨料射流扩孔试验结果基本吻合。
In order to improve the reaming efficiency of radial horizontal well bore, the elliptical exit nozzle was introduced into the abrasive jet reaming technology. The Realizable K-ε turbulence model was applied to the simulation of the nozzle with elliptical exit. Numerical results were compared with results of conical nozzle. The results show that the jet has a certain spreading and the diffusion angle on short shaft section is greater than that on the longitudinal profile. The jet velocity in the nozzle and the outlet velocity gradually decrease along with the length-width ratio increasing, while increase with the outlet di- ameter increasing. When the nozzle entrance velocity and outlet diameter are the same, the outlet axial velocity of the nozzle is less than that of the conical nozzle. When dimensionless nozzle distance is greater than 11.3, the jet velocity is greater than that of the conical nozzle. The nozzle export section width increases with the distance from nozzle increasing, and the reaming width of the elliptical exit nozzle is greater than that of conical nozzle under the same conditions. The jet has self- moldability. The numerical results agree well with the experimental results of abrasive iet reaming.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第1期80-84,90,共6页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家重大专项项目(2011ZX05060)
关键词
射流
扩孔
长圆喷嘴
数值模拟
jet
reaming
nozzle with elliptical exit
numerical simulation
