PD C钻头用于软到中硬的均质地层钻进具有钻速高、寿命长等特点，但不适合含砾石地层和软硬交错地层。
PDC bits have been used to drill the homogeneous formation from soft to medium-hard, but they are not suitable for drilling in gravel and multi-interbedded formation.
玻璃钢取心工具是专为提高辽河油田含砾石松散地层取心收获率和岩心完整性而研制的。
Glass steel coring tool is specifically developed for improving the core recovery of conglomeratic weak formation and the core integrality in Liaohe Oilfield.
本文简易介绍了劈裂灌浆的施工工艺，通过资料分析、灌后检查，证明在含砾石土石坝加固处理中取得了较好的效果。
The construction craft of the split grouting is introduced in this paper, By check analysis, the split grouting has proved itself to get a good result in reinforcement of the gravel earth dam.
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