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At present, there are many kinds of drill bits used in the oil industry, according to different drilling methods to classify the bit, it can be divided into diamond bit, cone bit and scraper bit, these three kinds of drills are the most basic bit form. Among the three kinds of drill bits, the most popular and widely used in oil drilling is the cone bit, which has a deep application degree. Comparing the three drills, a bit with the smallest range is a scraper bit. This paper mainly introduces the diamond bit and the cone bit.