Steel Tooth Bit

1)certified by ISO9001&API
2)covers all IADC codes
3)size: 3 3/4" (95.3mm)~26" (660.4mm)
4)used for oil well and water well

12 1/4 " hjt117gc (311.15mm)
Design features of this bit

1) metal face sealed journal bearing

Hj series bit uses journal bearing and metal face seal; It can perform consistently in high speed drilling application.

2) special gage protection on cone

A row of trimmers is added between heel row and gage row compacts. As a result, not only cone shell is protected, but also the borehole wall is properly trimmed.

3) head od reinforcement

Head od are designed with carbide inserts to protect the shirttail and seal to effectively improve the bit's ability to prevent diameter shrinkage.

4) hardfacing on shirttail

This feature can provide better protection for seal and bearing to extend the bit's service life.

5) center nozzle

Center nozzle can avoid bit balling, eliminate fluid stagnant area at bottom hole, increase rising velocity of drilling cuttings, and improve rop, which is suitable for drilling formations from soft to middle soft with low compressive strength and high drillability.

Recommended operating parameters

Wob 90 ~ 280(kn)

Ideal wob range 150~220(kn)

Rotary speed 80 ~ 300 (rpm)

Ideal rotary speed range 110~250(rpm)

The above parameters are only for reference. Optimized parameters are determined by drilling process and lithology of formations on site.

Applicable formations

Very soft with low compressive strength and high drillability, such as shale, clay, sandstone and conglomerate, etc.