Tricone Bit

1.Preparation before entering the well

①Make sure there are no falling objects at the bottom of the well.

② Check that the appearance of the drill is not damaged.

③Prohibited to contact with hard materials such as steel directly.

④Select nozzle and size according to actual needs.

2.Tripping in

①Drill down slowly before approaching the bottom of the well,the mud pump displacement is maximized,the rotation speed is controlled at 30-60rpm,and cycle for 5-10 minutes before approaching the bottom of the well.

② After the drill bit  touches the bottom of the well,it is necessary to maintain low WOB,low rotation speed,large displacement,low torque,and the rotation speed cannot exceed 60rpm.

③After drilling for 20 minutes,gradually increase the WOB and rotation speed to a reasonable value.

3.Make connection

①The drill bit can only be lifted off the bottom of the well after natural release of WOB,it cannot be lifted directly.

② After making connection,follow the precautions for the tripping in.

4.Drilling in

①Pay close attention to the changes in the values of SPP and WOB.

② When skipping and rough drilling occur in the drill bit,it is necessary to adjust the WOB and rotation speed in time.

③If you find that the drill bit has no footage,the pump pressure is significantly increased/decreased,the mechanical speed is suddenly reduced,and the torque is increased,etc,immediately pull out the drill bit and check.