single cone drill bit and other comparative

Bearing on the single cone bit, teeth, cone dorsal and disposal flow was enhanced and improved, according to the  cbn grinding wheels construction of various problems. Improved single cone bit in the application of slim hole drilling was a great victory, overcoming the previous single cone bit various defects, eliminating the single cone bit teeth easily fall dorsal easily pierced, too more from the drilling and drilling higher interest rates and other issues, field application is effective and can improve the sidetrack drilling speed, shorten the drilling cycle, thereby reducing drilling interest, can be applied by oblique drilling, more suitable for steady oblique drilling, more suitable for slim hole drilling.
Now commonly used in small-size drill mainly tricone bit, PDC drill bits and single cone bit, PDC drill bit due to the  sds plus drill bits structure and working principle of limitation. Among them, three cone bit bearing most obvious disadvantage is small in size, mainly by the impact, crush and squeeze a small way from scraping rock breaking, drill teeth touch bottom number changes, dental discontinuity, short bearing life .
Not only work when torque is large, the  cutting tools teeth washing and cooling difficulties, and its strong sensitivity of lithology, stratigraphy and is not suitable for drilling hard and soft gravel staggered formation; single cone bit more applicable than three cone drill in both strength and ductility are large formations, while for PDC bit difficult to deal with hard interlayer and other complex formation, and the structure is simple, bearing a large space, the use of safe, reliable, easy to drill size miniaturization field use to good effect.