应用地层参考

软岩地层：一般指30MPa以下地层，采用517齿

中硬地层：40-80MPa硬度岩石，采用537、617齿

硬岩地层：大于80MPa岩石，采用637齿

SOFT ROCK FORMATION：≤30MPa,  IADC 517

MEDIUM TO MEDIUM HARD FORMTION: 40-80MPa,IADC 537/617

HARD FORMATION:≥80MPa, IADC637

IADC 217

低抗压强度的软到中等地层，如中软页岩，中软石灰岩、中软砂岩和有硬夹层的软地层

Soft to medium formation with low compressive strength,such as mid-soft shale,mid -soft limestone,mid-soft sandstone and soft formation with hard interbeds

IADC 517

低抗压强度的软地层，如泥岩、石膏、盐岩、软页岩、软石灰岩

soft formation with low compressive strength ,such as mudstone,gypsum,salinastone,soft shale and soft limestone

IADC537

低抗压强度的软到中等地层，如中软页岩、中软石灰岩、中软砂岩和有较硬研磨性夹层的中等地层

Soft to medium formation with low compressive strength,such as mid-soft shale,mid -soft limestone,mid-soft sandstone and medium formation with harder abrasiveness interbeds

IADC637

高抗压强度的硬地层，如砂岩、石灰岩、白云岩和硬石膏、大理石

Hard formation with high compressive strength,such as sandstone，limestone,dolomite and anhydrite,marble