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The drill is the main part of the drilling equipment, its main function is to break the rock and form the borehole. Rotary bit is currently widely used in the oil industry, the rotary bit under the mechanical drive will produce rotation, thus driving the entire bit to produce centripetal movement, and through the penetration, grinding to make the rock cracks and broken, play a downward drilling role. Bit is one of the main drilling equipment, according to the work environment, the different geographical environment, the size of the drill bit, the shape should be different, in the oil drilling work, should be specific needs, the specific design plan as the basis for the rational, scientific selection of the drill. In the specific drilling work, the scientific selection of drill bits and reasonable determination of drilling fluid, so as to improve the working efficiency and quality of oil drilling, can make the oil drilling better play its own value, to promote the development of oil industry to make a certain contribution.