Description

Main structure features:

1. Using two-stage gage protection of the cone and bit body, and with active cutting gage protection compacts and passive anti-friction gage protection compacts on bit body, the bit has good gage protection and up reaming abilities.

2. Staggered, compacts arrangement on cone, and optimized cone shape, the number of the rows, number of compacts as well as compact exposure height.

3. Two-watercourse (main and auxiliary) structure is used for the hydraulic system with a jet nozzle and a divergent nozzle. The nozzle combination is optimized.

4. The advanced high-saturated Buna-N rubber seals are used for journal and bearing pin sealing, and optimized sealing compression and special gage protection design ensure the reliability of the bearing seal.

5. Performance of the bearing is improved by applying hard facing layer on head bearing surface and inlaying friction reducing alloy on surface of cone ID.

6. Ball locked cone makes the bit being applicable to high RPM.

Product predominance: It can be used widely, not only for side tracking, but also for deep hole drilling. Its working torque is lower than that of PDC bit under the same WOB and formation conditions, thread expanding problem normally encountered with small size drilling tools can be reduced and consequently, the down hole accident is avoided. By combining advantages of both tri-cone and PDC bits and eliminating deficiencies of the both, the single cone bit is more suitable for drilling formations with high strength and plasticity than tri-cone bit, and more suitable for drilling tough formations with hard stringers and other complicated formations than PDC bit. The bit can meet requirements of high speed and other special drilling applications when used with down hole motor drilling tools. Its advantages are simple structure, large bearing clearance, high reliability, and bit size easy to be designed smaller.