8 1/2 HF 637 tricone bit

HF series bit for hard formation drilling 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 formation and high abrasive formations effectively and safely. The size range of HF series bit is from 6 to 12 1/4 inch, and IADC varies from 537 to 737 Keywords: Long working life and high reliability are the significant features. Cutter crest enhancement Numerical experiment and optimized cutter Material &shape ensure high efficiency of cutting, Enhanced heel row and gage design Super-hard material diamond-enhanced inserts. Optional features: D: Gage protection by diamond enhanced cutters on head O.D.: The gage protection is significantly by adding diamond enhanced gage compacts on head OD. Bit with this feature is suitable for drilling an directional and horizontal well with high abrasive formation. G: Head OD enhancement: Special insert are strategically arranged on head OD to reduce effectively wear of the head and improve bit’s gage protection in abrasive formation or directional wells. Improved protection can extend service life of the bit. H: Gage protection by diamond enhanced cutters on cone: Diamond compacts arranged in heel row or gage row for the cone can enhance gage protection and increase its working life. It is suitable for frilling in high abrasive formation, hard or extreme hard formations. K: Cutting structure for hard plastic formation Unique designing parameters and lengthen insert crest enlarge rock ?breaking volume at the bottom hole and increase bottom hole coverage and increase ROP of the bit in hard plastic formations. L: Head OD stabilization pad Better protection of hit head and compensating hole can be achieved in directed and horizontal well drilling applications. There are two tyoes:1) bit head OD is reinforces with stabilization pad and compacts. 2) Spherical inserts are used in the lubricati....

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