水泥环 meaning in Chinese

cement mantle
cement sheath

Effects of stiffness and strength of casing cement - sheath on collapsing strength
套管水泥环刚度与强度对抗挤性能影响分析
Usage : the centralizer makes the casing pipe at the center of the well . such can make cement ring even and better quality
产品说明用途：扶正套管使套管在井眼内居中，使水泥环均匀，提高固井质量。
Water shutoff agent dsz - a is composed of inorganic particle . its specialities are low cost , easily flow , high strength and long valid period . the agent suits non - selective water shutoff in sand formation . dsz - a not only can plug high water - bearing formation , but also can plug case leakage . dsz - a has been applied on site and gotten good effect . it is a agent which has wide prospect
濮城油田推广应用顶封卡漏套管保护管柱,消除了环套空间水泥环窜漏影响,对漏点上部套管实施了保护,减少了无效注水,增加了有效注水,对应油井地下地质能量恢复后,增油效果明显