IADC WOB(kN/mm)(bit dia) RPM(r/min) Applicable Formations
435 445 0.35--0.95 150--60 Very soft formations with low compressive strength and high drillability,such as clay,mudstone,chalk ,etc.
515
525 0.3--0.8 200--80 Soft formations with low compressive strength and
high drillability,such as mudstone,gypsum ,salt,soft shale,soft limestone,etc.
535
545 0.35--0.9 180--80 Soft to medium soft formations with low compressive strength and high drillability.such as medium soft shale,
hard gypsum,medium soft limestone,medium soft sandstone,soft formation with harder interbeds,etc.
615
625 0.35--1.0 180--80 Medium hard formations with high compressive strength,such as hard shale,limestone,sandstone,
dolomite,etc
635
0.4--1.1 150--60 Hard formations with high compressive strength ,such as sandstone,limestone,dolomite,hard gypsum,marble,etc
Note:The upper limits of WOB and RPM in above table should not be used simultancously.
435 445 0.35--0.95 150--60 Very soft formations with low compressive strength and high drillability,such as clay,mudstone,chalk ,etc.
515
525 0.3--0.8 200--80 Soft formations with low compressive strength and
high drillability,such as mudstone,gypsum ,salt,soft shale,soft limestone,etc.
535
545 0.35--0.9 180--80 Soft to medium soft formations with low compressive strength and high drillability.such as medium soft shale,
hard gypsum,medium soft limestone,medium soft sandstone,soft formation with harder interbeds,etc.
615
625 0.35--1.0 180--80 Medium hard formations with high compressive strength,such as hard shale,limestone,sandstone,
dolomite,etc
635
0.4--1.1 150--60 Hard formations with high compressive strength ,such as sandstone,limestone,dolomite,hard gypsum,marble,etc
Note:The upper limits of WOB and RPM in above table should not be used simultancously.
Certificate
- API ISO9001
Main Products
PDC bits Matrix Body PDC bits, Tricone bits, Drag bits and so on