The 121/4 517 Tricone Bit made a record- breaking in Challenging in the surface section with several interbed
Bit drills entire 1600-ft section at average speed of 38.1ft/hr
An operator working in the FULONGQUAN in challenged HJ517G to drill the surface section with several interbed,and completed the1950-ft in only 42 hrs.
One HJ517G Tricone Bit drilled the entire surface section(from0ft to 1600ft),the vertical surface section,at an average speed of 38.1ft/hr ,the efficiency Steer-ability saved 20- hours in the surface section.
When pulled from the hole ,the121/4-in tricone bit had no damage on theteeth structure at all.