Introduction:
High precision journal bearing with two thrust faces. Ball locked cone. Hardfaced head bearing surface. Cone bearing inlaid with friction reducing alloy and then silver-plated. Abrasion resistance and seizure resistance of the bearing are improved, and suitable for high rotary speed.
Cutting Structure
Conic&chisel insert improved the bit aggressivity and abrasive resistance.Reinforcing the comprehensive mechanical properties of cutting tooth by using high quality tungsten carbide inserts of new formula and new techniques of insert bit.
Bearing Structure
High precision journal bearing with two thrust faces. Ball locked cone. Hardfaced head bearing surface. Cone bearing inlaid with friction reducing alloy and then silver-plated. Abrasion resistance and seizure resistance of the bearing are improved, and suitable for high rotary speed.
Gauge Structure
The multiple heel position with gauge trimmer on the heel, tungsten carbide and hardfacing on the shirttail, strengthened spear point will enhance the gauge protection.
Seal and Lubrication
The bearing seal is adapting the high quality HNBR O-ring. The better seal compression and the radial seal structure can enhance the seal performance. The compensation system and the high quality bit grease can limit pressure differential, and greatly increase the lubricating reliability.
Applications:
Medium to hard with high compressive formations, abrasiveness formations such as hard sandstone/dolomite/conglomerate.etc
HENGJI BIT SPECIFICATION | |
Bit Size | 8 1/2'’ 215.9mm |
IADC Code | 617 |
Series | HR |
Tooth type | TCI/tungsten carbide insert |
Connection | 4 1/2 API REG PIN |
Bearing | rubber sealed bearing |
Nozzle | three jet nozzles |
Rotary Speed(rpm) | 90~50 |
Weight on Bit(KN/MM) | 0.45~1.1 |
Application | water well,oil well,HDD,exploration,etc |
Formation | Medium hard formations with high compressive strength,such as hard shale,sandstone,limestone,dolomite,etc. |
Regular Models