Tricone Bits Cutting StructureThe wear-resistance of teeth is enhanced with premium tungsten carbide hardfacing on the tooth surfaces for steel tooth bit.The durability of premium tungsten carbide inserts is improved with new formulas and new techniques for insert bit.Tricone Bits Gauge Structure Multiple gauge protection with gauge trimmers on the heel and gsuge inserts on the gauge suifame of the cone,tungsten carbide inserts and hardfacing on the shirttail increases gauge holding capacity and bearing life.Tricone Bits Bearing StructureHigh precision journal bearing with two thrust faces,balls lovk the cone .Hardfaced Head bearing suifame.Cone bearing inlaid with friction-reducing alloy and then silver-plated.Abrasion resistance and seizure of the bearing are improved,and suitable for high rotary speed.Seal and LubricationThe advanced metal seal package consists of two metal seals and two elastic energizers.Compressed energizers ensure good contact being kept on two sealing suifaces of metal rings by elastic force ,and achieves the bearing seal .When drilling,metal seals are relatively dynamic,and the energizers are static.This will improve the reliability and durability of bearing seal .The pressure compensator system and advanced grease can greatly increase the lubricating reliabiliry.Tricone Bits ApplicationIt is suitable for downhole motor and high speed applications.Recommended Drilling ParametersIADCWOB(kN/mm)(bit dia)RPM(r/min)Applicable Formations437 447 0.35--0.9240--70Very soft with low compressive strength and high drillability,such as shale,clav,chalk,mudstone,gypsum,sandstone,soft limestone517 527 0.35--1.0220--60Soft with of low compressive and high drillability,such as mudstone .gypsum,salt ,soft shale ,soft limestone.etc.537 547 0.45--1.0220--50soft to medium with low compressive strength ,such asmedium soft shale,medium soft limestone,medium softsandstone and medium formation with harder and abrasiver interbeds .etc.617 6270.45--1.1200--50Medium hard with high compressive strength such as limestone hard shale ,sandstone and dolomite,etc.6370.5--1.1180--40Hard fomation with high compressive strength ,such aslimestone,dolomite,sandstone,hard gypsum,and marble.etc.Note:The upper limits of WOB and RPM in above table should not be used simultancously.Crystal Web:http://www.bjleeding.com/tel: 86-01057290815mobilephone: 86-13269002360skype: bjleeding02QQ: 973987086Email:leedingj@163.com leedinglj@gmail.com
