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日本新日铁以中泽吉董事长为首的技术交流代表团一行11人与四川石油管理局高级技术人员关于新日铁油管、特殊丝扣套管技术交流于1991年3月6日～8日在成都进行。新日铁着重介绍了抗硫钢种,特殊丝套管等新产品,这次交流是1989年该公司2次在川东钻探公司现场技术服务7英寸NT-95SS钢级NS-CC特殊丝扣套管之后的继续。日方表示为了取得NS-CC特殊丝扣套管在四川气田的高含硫深井的严酷条件下的试验效果,愿意为此转让特殊丝扣的修复技术专利,派出技术人员到现场协助修套管,提供配件工具,
Japan’s Nippon Steel to Nakazawa, chairman of the delegation led by a delegation of 11 people and Sichuan Petroleum Administration senior technical staff on the Nippon Steel Tubular, special threaded bushing technology exchange in March 6, 1991 ~ 8 In Chengdu. Nippon Steel focused on introducing new products such as sulfur-resisting steel and special wire sleeves. This exchange was conducted in 1989 by the company twice in the eastern Sichuan drilling company on-site technical services 7-inch NT-95SS grade NS-CC special thread Continue after casing. The Japanese side said that in order to obtain the test result of the NS-CC special threaded casing under the harsh conditions of the high-sulfur deep well in Sichuan gas field, it is willing to transfer the patent for the repairing technology of special threaded fasteners for this purpose and dispatched technicians to assist in the repair of the casing , To provide parts tools,