Main structure features:
1 Journal bearing. Head bearing surfaceis hardfaced. Cone bearing is inlaid with friction reducing alloy and then silver-plated. The load capacity and seizure resistance of the bearing is greatly improved. 
2 O ring seal is made of high saturated buna-N with the more wear resistance. The increased seal section and precisely designed sealing flange in the cone sealing area increases the reliability of the seal.
3 The bit bearing can be ball locked or ring locked. Bit with ring lock bearing can stand high weight on bit and bit with ball lock bearing can be applied to high rotary speed drilling.
4 All-rubber compensator is used which can limit pressure differential and prevent drilling fluid from entering the lubrication system and this provides the bearing system with good assurance of lubrication.
5 New type of grease that can sustain high temperature up to 250ºC is utilized.
6 High wear resistance and excellent cutting ability of the insert bit are given by using carbide compacts with high strength and high toughness in combination with optimized number of compacts and rows, compact exposure height and special shaped compacts. For steel tooth bit, the tooth surface is hardfaced with new type of wear resistant material and thus working life of the cutting structure is exterded while high ROP is also maintained.
Product predominance: HA series bit is O-ring sealed journal bearing product. It can sustain higher WOB under normal rotary speed and is suitable for drilling formations from very soft to very hard by properly selecting different cutting structures.
Available sizes and types of HA series tri-cone bits: HA116, HA117, HA126, HA127, HA136, HA137, HA216, HA217, HA417, HA437, HA447G, HA517G, HA527G, HA537G, HA617G, HA637G,etc. |
