First, drilling preparation

1, check whether the drill before the bit body is damaged, off the teeth, etc., to determine the bottom of the bottom of non-chip teeth, hard alloy, steel and other hard objects exist to ensure clean bottom, no broken metal.

2, Carefully handling the drill bit, the drill placed on a rubber mat or wood. Do not place the drill directly on the iron plate.

3, Check the drill bit teeth for damage, foreign matter in the drill bit, nozzle hole is there 0-ring, according to the need to install the nozzle.

Second, the buckle

1, clean the bit or button deduction bit and smear thread oil.

2, the shackle cards stuck in the drill, put down the drill string to make it with the bit or the button bit buckle contact with the buckle. Put the drill bit and the shackle into the carrousel, and then tighten the screw in accordance with the specified torque.

Third, drill down

1, remove the unloader carefully put down the drill through the turntable, blowout preventer, casing hanger.

2, pay attention to the last encounter occurred when the resistance interval, during drilling encountered dilatation and doglegs should make the drill slowly through.

3, 30 meters from the bottom of the hole began to rotate at a speed of 60rpm and rinse bottom hole with rated displacement.

4, pay attention to observe refers to the heavy table and torque table so that the drill bit smooth contact bottom hole. After reaching the bottom of the well about 0.5 meters above the rated displacement of circulation 5-10 minutes.