Size of Rock Bit 8 1-2 inches
215.9mm
IADC Code 517G
Thread Connection 4 1/2 API reg pin
WOB(kN/mm) 0.5~1.0
RRM(r/min) 140~60
Recommended Drilling Parameters
IADC WOB(kn/mm) RRM(r/min) Applicable Formations
116 117 0.35~0.8 150~80 Very soft formations with low compressive strength and high drillability.such as clay,mudstone,chalk,etc.
126 127 0.35~0.9 150~70 Soft formations with low compressive strength and high drillability,such as mudstone,gypsum,salt,salt,soft shale,soft limstone,etc.
136 137 0.35~1.0 120~60 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.
216 217 0.4~1.0 100~60 Medium hard formations with high compressive strength,such as medium soft shale,hard gypsum,medium soft limestone,medium soft sandstone,soft for mations with harder interbeds etc.
246 247 0.4~1.0 80~50 Medium hard formations with high compressive strength,such as abrasive shale,limestone,sandstone,dolomite,hadr gypsum,marble,etc.
417 437 447 0.35~0.9 150~70 Very soft formations with low compressive strength and high drillability,such as clay,gypsum,salt,soft shale,soft limestone,etc.
517 527 0.5~1.0 140~60 Soft formations with low compressive strength ang high drillability such as mudstone,gypsum,salt,soft shale,soft limestone,etc.
537 547 0.45~1.0 120~50 Soft to medium formations with low compressive strength,such as medium soft shale,medium soft limestone,mediun soft limestone,medium soft sandstone,medium formation with harder and abrasiver interbeds.etc.
617 627 0.45~1.1 90~50 Medium hard formations with high compressive strength such as hadr shale,limestone,sandstone,dolomite,etc.
637 0.5~1.2 80~40 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 lable should bot used simulaneously
