摘要
借助计算流体力学(CFD)软件FLUENT,对环空低速注水泥顶替过程进行了数值模拟。分析了在低流速不同偏心度条件下,密度差对顶替效率和顶替界面稳定性的影响规律:套管偏心和非正密度差顶替都会影响顶替界面的稳定性;低速顶替时正密度差顶替效果最好,负密度差顶替效果最差;在偏心环空低速顶替过程中,采用较大的正密度差能够克服偏心影响而提高顶替效率。数值模拟结果与试验结果相吻合,表明采用数值模拟方法研究低速注水泥时密度差对顶替效率的影响规律是可行的。
The displacement process of cement in annulus was simulated by Fluent （a computational fluid dynamics software）. The impact of density difference on displacement efficiency and interface stabili ty was analyzed under low rate and different eccentricities. The results indicate that both eccentricities of casing and non-positive density difference impact the stability of displacement interface; positive density difference in low velocity displacing has best displacement result and the worst is the negative density difference; large positive density difference can overcome the eccentricity impact and improve the displacement efficiency. The agreement between numerical simulations and experiments indicates that using numerical simulation to investigate the impact of density difference on displacement efficiency at low cement slurry velocity is feasible.
出处
《石油钻探技术》
CAS
北大核心
2008年第5期62-65,共4页
Petroleum Drilling Techniques
