(1) The thread of the drill bit should be coated with standard lubricating grease, and the drill bit loading and unloading device should be used. (2) The drill bit should be straightened and slowly lowered when entering the well, and it should be aligned when reaching the blowout preventer to prevent damage to the PDC cutting teeth. (3) The drilling speed should be slow and the operation should be smooth. It is strictly prohibited to brake or jerk fiercely. During operation, the driller should closely monitor the weight indicator, and in case of resistance, it should not exceed 30kN. Otherwise, the square drill pipe should be connected for circulation, and the method of one punch, two passes, and three reams should be used to pass through. When reaming, the drilling pressure should be controlled below 20kN (lower than 10kN when the drill diameter is less than 215.5mm), and the rotational speed should be less than 50r/min. Large section drilling and non circulating drilling fluid drilling are strictly prohibited. (4) When drilling near the bottom of the well, the pump should be started in advance. When the drill bit is more than 0.5m away from the bottom of the well, it should be slowly moved up and down and the drilling tool should be rotated to fully circulate the drilling fluid. After cleaning the bottom of the well, calibrate the weight indicator. The bottom of the well can only be shaped after the pump pressure is normal. After confirming that the drill bit contacts the bottom of the well, use a speed of about 50r/min and a drilling pressure of 5-20kN to grind in the bottom of the well, with a footage of 0.5-1.0m.
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