HF Series Roller Cone Drilling Bits  is adopted advanced automatic welding technology with wear resistant alloy on surface hardfaced and cone bearing surface,

Hf series bit for hard formation drilling.
Failure types, such as tooth break, tooth wear, cone tip wear and bit diameter shrink etc., usually appear when conventional cone bits drill in hard formations. So we have developed HF series bit for hard formations. HFseries bit has structure features of metal face sealed and enhanced head O.D., so that the bit is suitable for drilling in hard formations.

· HF series bit has the advantages of long service life, high reliability, fast ROP and strong gage protection ability etc ..
· HF series bit is the ideal choice for drilling in hard formations and high abrasive formations effectively and safely.
· The size range of HF series bit is 7 7/8 – 12 1/4 inch and its IADC code is 537 – 737.

Long working life and high reliability
Head bearing of HF series bit is adopted advanced automatic welding technology with wear
resistant alloy on surface hardfaced and cone bearing surface is plated by using third-generation high-performance composite solid lubricating materials to increase bearing’s capacity.Composite solid lubricating material and new type of grease are applied to improve bearing’s working
environment. The bearing can receive higher WOB under using those bearing technology.

Cutter crest enhancement
Wear between cones of HF series bit is reduced to prolong service life by utilizing top inserts enhancing technique.
Numerical experiment and optimized cutter material & shape ensure high efficiency of cutting

Numerical experiment
Actual bit performance is simulated by advanced computer 3D simulation technology. The cutting structure applied in hard formation is designed under combination of physical experiments.

Optimized cutter material and shape

Cutter materials and shapes are scientifically matched with each other according to drillable difference of formation so as to reduce cutter breakage and increase cutter aggressiveness and wear resistance.
Applying super-hard material and enhanced heel row & gage design to prevent bit from diameter shrinkage
Enhanced heel row and gage design
High dense heel row and double gage rows arranged on HF series bit which prevent bit from diameter shrinkage effectively.
Super-hard material diamond-enhanced inserts
Adopting predominant diamond enhanced inserts developed by Kingdream in heel row and gage row to increase gage protection capability and service life. The cutters are used for drilling in hard formations with high abrasive and super-hard formations. (Optional features: D, H, K, L, X, YI )

Drilling Bits type:

HF537、HF547、HF617、HF627、HF637、HF647、HF737 HF537、HF547、HF617、HF627、HF637、HF647、HF737 HF537、HF547、HF617、HF627、HF637、HF647、HF737 HF537、HF547、HF617、HF627
HF537、HF547、HF617、HF627
HF537、HF547、HF617、HF627、HF637