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2010年8月10日全国石油钻采设备和工具标准化技术委员会秘书处在山东省烟台市召开2010年第二次标准审查会,会议分别对《石油天然气工业井下工具井下安全阀》1项国家标准和
August 10, 2010 The Secretariat of the National Technical Committee for Standardization of Petroleum Drilling Equipment and Tools held the second review meeting in 2010 in Yantai, Shandong Province. The meeting reviewed and approved 1 national standard of “Downhole Safety Valve for Downhole Tools of Oil and Gas Industry” with