J55 casing pipe is an important equipment for oil drilling. Its main equipment also includes drill pipe, core pipe and casing, drill collar and steel pipe for small diameter drilling. J55 oil casing specifications are mainly 139.7*7.72, 177.8*9.19, 244.5*8.94, 244.5*10.03, 244.5*11.05, etc.
J55 oil casing-API has three lengths: R-1 is 4.88 ~ 7.62m, R-2 is 7.62 ~ 10.36m, and R-3 is 10.36m to longer. Some imported goods are marked with the word LTC, namely the filament sleeve. In addition to adopting API standards, there are a small number of Japanese factory standards imported from Japan.
Commonly used casing steel grades are DZ40, DZ55, DZ753. According to SY/T6194-96. The tube and its couplings are of the same steel grade. Sulfur content <0.045%, phosphorus content <0.045%. Take chemical analysis samples according to the provisions of GB222-84. Chemical analysis was carried out in accordance with the relevant provisions of GB223.
According to the American Petroleum Institute standard APISPEC5CT 1988 first edition, casing steel grades H-40, J-55, K-55, N-80, C-75, L-80, C-90, C-95, P- 110, Q-125 a total of 10 kinds. The bushings shall be supplied with threads and couplings or in the form of any of the following pipe ends:Flat end, round thread without coupling or with coupling, partial trapezoidal thread with or without coupling, straight-through thread, special end machining, sealing ring structure.
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