After a roller cone bit has been working for a period of time, the diameter of the bit's blade will become smaller, shorter, and blunt at the same time, which will directly affect the ability to crush rocks. Due to tooth wear and erosion, the bearing damage of the cone bit will cause the cone to rotate inflexibly or the cone to jam. Therefore, in order to speed up the drilling speed, the electric drill
bit must be replaced in time. Drilling workers use the crane, traveling block and hook on the derrick to pull out all the drilling tools from the well according to the height of the derrick. The lifted electric drill pipe columns are discharged in the derrick in order. While the downhole drill string is proposed, the drilling pump should be used to continuously inject the drilling fluid into the annular space. The purpose is to keep the liquid level in the wellbore from falling, so that the wellbore The pressure can balance the formation pressure to prevent the well wall from collapsing or the fluid in the downhole formation from entering the wellbore. At the same time, special attention should be paid to the sticking that may occur due to the shrinkage of the borehole wall, and the operator must strictly control the lifting speed. After all the electric drill pipes and drill collars in the wellbore have been lifted out, the drill bit that needs to be replaced will come out at the same time. The workers will unload the old drill bit and install the new drill bit and descend into the well in the order of the original column to resume drilling .
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