應(yīng)用地層參考

軟巖地層：一般指30MPa以下地層，采用517齒

中硬地層：40-80MPa硬度巖石，采用537、617齒

硬巖地層：大于80MPa巖石，采用637齒

SOFT ROCK FORMATION：≤30MPa,  IADC 517

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

HARD FORMATION:≥80MPa, IADC637

IADC 217

低抗壓強(qiáng)度的軟到中等地層，如中軟頁(yè)巖，中軟石灰?guī)r、中軟砂巖和有硬夾層的軟地層

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

低抗壓強(qiáng)度的軟地層，如泥巖、石膏、鹽巖、軟頁(yè)巖、軟石灰?guī)r

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

IADC537

低抗壓強(qiáng)度的軟到中等地層，如中軟頁(yè)巖、中軟石灰?guī)r、中軟砂巖和有較硬研磨性?shī)A層的中等地層

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

高抗壓強(qiáng)度的硬地層，如砂巖、石灰?guī)r、白云巖和硬石膏、大理石

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