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English (N80 steel pipe)
Domestic casing is made of hot-drilled or cold-drawn steel for geological drilling. The steel grade is referred to as “geology†(DZ), and commonly used casing grades are DZ40, DZ55, and DZ753.
(1) The main importers of petroleum casings are: Germany, Japan, Romania, the Czech Republic, Italy, the United Kingdom, Austria, Switzerland, the United States, Argentina, and Singapore. The import standards mostly refer to the American Petroleum Institute standards API5A, 5AX, 5AC. Steel grades are H-40, J-55, N-80, P-110, C-75, C-95, etc. Specifications are mainly 139.77.72R-2,177.89.19R-2,244.58.94R-2,244.510.03R-2,244.511.05R-2 and so on.
(2) There are three types of API specifications: R-1 is 4.88 to 7.62 m, R-2 is 7.62 to 10.36 m, and R-3 is 10.36 m to longer.
(3) Some of the imported goods are marked with LTC, which is the long thread buckle bushing.
(4) In addition to adopting the API standard for casings imported from Japan, a small number of Japanese manufacturers' standards (such as Nippon Steel, Sumitomo, Kawasaki, etc.) are also implemented. The steel grades are NC-55E, NC-80E, and NC-L80. NC-80HE and so on.
(5) In the case of claims, black buckles and thread buckles were damaged, the tube body was folded, the close distance between the broken buckle and the screw thread was out of tolerance, the external defects such as the coupling J value were poor, and the brittleness of the sleeve, low yield strength, etc. quality problem.
Information Sources:
N80 steel pipe is generally an oil casing. The N80 oil casing is an important equipment for oil drilling. Its main equipment includes drill pipes, core pipes and casings, drill collars and small-diameter drilling steel pipes.