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1991年5月14日至19日,在四川省南充市西南石油学院,由中国石油天然气总公司钻井局、装备局、科技发展局和人教局联合主持鉴定了由西南石油学院钻头研究室负责的总公司“七五”技术储备项目“牙轮钻头破岩机理及设计”及其所含的四个子项目。参加鉴定会的国内专家教授共52人,共同认真审查了研究工作总结报告和各个子项目的
From May 14 to May 19, 1991, at the Southwest Petroleum Institute of Nanchong City, Sichuan Province, the Drilling Research Laboratory of Southwest Petroleum Institute was jointly appointed by the Drilling Bureau, Equipment Bureau, Science and Technology Development Bureau and People Education Bureau of China National Petroleum Corporation Corporation’s “Seventh Five-Year” technical reserve project “roller cone bit rock breaking mechanism and design” and its four sub-projects. A total of 52 domestic experts and professors who participated in the appraisal meeting jointly reviewed the research summary report and each subproject