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一、概况根据美国石油协会(API)标准要求,每根油套管出厂时两端必须装上一对具有一定要求的内外螺纹保护环。国内外油井管制造厂所采用的保护环制作方法有: (1) 塑料注塑成形; (2) 钢管管料直接车丝(也有用废次管接头改制的); (3) 钢板冲压成形十车丝; (4) 钢管冲压成形十车丝。
I. Overview According to the American Petroleum Institute (API) standards, each oil casing must be fitted with a pair of internally and externally threaded guard rings at both ends when leaving the factory. Domestic and foreign oil well pipe manufacturing plant used in the production of the protection ring are: (1) plastic injection molding; (2) the direct tube of steel pipe material (also useful waste pipe joints modified); (3) Wire; (4) steel stamping forming ten car wire.