●Applicable formations:
Very soft: such as soft marl, clay, salt, etc.
Design character：
●O-ring sealed journal bearing
Journal bearing structure with head bearing hardfaced and cone bearing silver plated to improve load
capacity and anti-galling ability of the bearing. More wear and high-temperature resistant highly
saturated Buna-N rubber O-ring is used to improve reliability. Larger O-ring section reduces pressure
on the seal, and the boss at outer end of the seal is also helpful for reliability of the
seal.Surface of the thrust bearing couple are specially treated for decreasing friction and increasing
rigidness, load capacity of the bit and anti-galling ability of the bearing are consequently improved.● Cutting structure
Hardfaced gage and tooth surfaces.● Hardfacing on shirttail
This feature can provide better protection for seal and bearing to extend the bit’s service life.
In China
The above parameters are only for reference. Optimized parameters are determined by drilling process and lithology of formations on site.
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