Foam cementing is commonly used for cementing in a shale gas well, while perforation after casing set is often for well completion.

页岩气固井主要采用泡沫水泥固井技术，完井方式以套管固井后射孔完井为主。

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The thesis also studied that the effect casing strength of casing wear and corrosion, established casing residual intensity computational module after casing wear and corrosion.

论文研究了套管磨损、腐蚀对套管强度的影响，并建立了套管磨损后和套管腐蚀后的剩余强度计算模型。

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With a stronger steel casing and backup shock-resistant triggering mechanisms, the Perseus can smash through several metres of reinforced concrete and detonate only after it has gone into a bunker.

珀尔修斯拥有更坚固的钢铁外壳和备用的抗震性触发系统，能击穿数米厚的钢筋混凝土，并在进入掩体之后才引爆。

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In June, after U.S. investigators discovered the spent casing of a Russian-made surface-to-air missile lying in the desert near the Prince Sultan air base, Saudi intelligence arrested 11 Saudi members of an al-Qaeda cell for plotting to shoot down U.S. jets that use the facility and for preparing attacks against other American targets in the kingdom.

CNN: Do We Still Need the Saudis?