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1·The ideal performance of cement sheath should be high intensity with low stiffness.

理想水泥环的性能应该是高强度、低刚度。

2·Gamma density logging method is used to measure the volume density of the cement sheath.

伽马密度测井测量水泥环体密度，这种测量方法与固井各胶结面状态无关。

3·Destruction of cement sheath outside casing is one of the causes for channeling and corrosion.

套管外水泥环的破坏是导致管外串槽、套管外腐蚀的原因之一。

4·Cement sheath are the main composites for cementing well and isolating the pay zone together with casing pipes.

水泥石是构成井下水泥环的主要材料，它和套管共同起到层间封隔的作用。

5·A comparison is made on the anti-collapse capability of the casing with and without cement sheath by means of full-scale test.

采用全尺寸实物试验方法对套管有无水泥环情况下的抗挤毁能力做了对比试验。

6·Finally, the conclusion is that the pulse pressure caused by vibrated water injection can not damage to casing pipe, cement sheath and formation.

最后得出结论——振动注水所产生的脉动压力不会对套管、水泥环及地层造成损坏。

7·In order to dissolve the cement sheath fully and ensure the operation safety, we determine the reaction time, acid flushing turns and operation process.

以充分溶解水泥环为目的，以保证施工安全为前提，确定了酸洗的反应时间、次数和施工工序。

8·It is one of the important factors of ensuring the seal quality of cement sheath in a small clearance to raise slurry displacing efficiency in a slim hole.

提高小井眼水泥浆的顶替效率，是保证小间隙水泥环密封质量的重要因素之一。

9·The later usually raises the most concern and is perhaps the hardest goal to achieve when there is potential for formation gas to migrate into the cement sheath.

但层间封隔问题更引人注意，特别是当有气体侵入水泥环中的可能时更是难以达到预期目标。

10·Plastic cement solves cracking problem of cement sheath successfully. With high strength fiber added in, not only the strength, but also the flexibility is increased.

塑性水泥可以很好地解决水泥环的脆裂问题，它通过掺入高强度纤维，不仅可增加水泥石的强度，而且可改变水泥石的弹性。