RUS / ENG
Вид:
я
200.0 512X (7 ⅞" 512)
The bit is designed for drilling of soft abrasive rock formations, e.g. rhyolite, dacite, andesite, soft limestone, conglomerate of sedimentary rocks, coarse-grained mineralized marble, quartzeous shale, phosphorite with phosphate and carbonate cement, overburden of coal seams, also found in shale mines.
Recommended drilling parameters for maximum efficiency of the bit: low and medium rotation speed (60-115 RPM) and axial load from 30 to 140 kN.
Rock strength range - from 3 000 to 6 500 PSI.
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Технические характеристики
Bit diameter, mm:
200.0
Bit diameter, inch:
7 ⅞
Bit designation, IADC:
512X
Connection thread, API:
4 ½" REG
Bearing type:
Air-cooled, on rolling bearings
Formation type:
For soft abrasive formations
Rotation speed. RPM:
115-60
Max. applicable load, kN:
30-140
Weight, kg:
26.4
Bearing/cooling type:
Roller – Ball – Roller / Air cooling
Blow-through type:
Side / center
Cutting structure:
Tungsten carbide inserts
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