Suitable for soft to medium non-abrasive formation.
适应软到中等非研磨性地层。
Suitable for soft to medium hard Non-abrasive formation.
适应于软到中硬非研磨性地层。
Low compressive strength of soft to medium formations. Such as soft shale, soft limestone, soft sandstone, hard and soft abrasive interbedded medium formation.
低抗压强度的软到中等地层，如中软页岩。中软石灰岩。中软砂岩。和软硬研磨性夹层的中等地层。
Low compressive strength of soft to medium formations. Such as soft shale, soft limestone, soft sandstone, hard and soft abrasive interbedded medium formation.
低抗压强度的软到中等地层，如中软页岩。中软石灰岩。中软砂岩。和软硬研磨性夹层的中等地层。
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