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三牙轮钻头是石油钻探的重要工具。二十多年来,国产钻头的产量和质量都有很大的提高。为了尽快地满足我国石油工业飞速发展的需要,石油化工部、一机部把三牙轮
Tri-cone bits are an important tool for oil drilling. For more than two decades, the production and quality of domestic bits have greatly improved. In order to meet the rapid development of China’s oil industry as soon as possible to meet the needs of the Ministry of Petrochemical Industry,