It is suitable for sidetracking, deep well drilling and old well repairing.
1 Two watercourse can improve washing endurance and prevent mud.
2 Silver-plated at sliding surfaces of cone bearing to strength self-lubricating effect, and improve the bearing of wear-resisting life.
3 The bit inlaid with diamond compact teeth can be more effectively improve working life.
4 Two advanced high-saturated buna-N rubber seal rings are used for journal and bearing pin sealing, which ensured the high reliability of the bearing seal structure.
5 The bearing is improved by applying hard facing layer on head bearing surface, extended working life.
|527||0.3-0.7||120-50||Soft formation with low compressive strength and high drillability,such as mudstone,gypsum,salt,soft shale,soft limestone,etc|
|547||0.3-0.7||100-50||Soft to medium formation with low compressive strength,such as medium soft shale,medium soft limestone,medium soft sandstone,medium for formation with harder and abrasiver interbeds,etc.|
|617||0.4-0.8||90-50||Medium hard formations with high compressive strength,such as hard shale,limestone,sandstone,dolomite,etc.|