Steel pipe knowledge: N80 steel pipe is generally oil casing
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N80 steel pipe is commonly used as an oil casing in the petroleum industry. It plays a crucial role in oil drilling operations, serving as a critical component alongside other equipment such as drill pipes, core pipes, drill collars, and small-diameter drilling steel pipes. The term "N80" refers to the tensile strength of the steel, making it suitable for high-pressure environments.
In domestic applications, casing materials are typically made from hot-rolled or cold-drawn steel, specifically designed for geological drilling. These casings are often referred to by their grade, such as DZ40, DZ55, and DZ753, with the designation "DZ" indicating their use in geology-related applications.
When it comes to imported petroleum casings, major importing countries include Germany, Japan, Romania, the Czech Republic, Italy, the UK, Austria, Switzerland, the US, Argentina, and Singapore. These imports usually adhere to the American Petroleum Institute (API) standards, such as API 5A, 5AX, and 5AC. Common steel grades include H-40, J-55, N-80, P-110, C-75, and C-95. The specifications often follow standard dimensions like 139.7×7.72R-2, 177.8×9.19R-2, 244.5×8.94R-2, 244.5×10.03R-2, and 244.5×11.05R-2.
API casing specifications are divided into three lengths: R-1 ranges from 4.88 to 7.62 meters, R-2 from 7.62 to 10.36 meters, and R-3 longer than 10.36 meters. Some imported casings are marked with LTC, which stands for Long Thread Coupling, designed for easier and more secure connections.
In addition to the API standards, some Japanese manufacturers, including Nippon Steel, Sumitomo, and Kawasaki, also produce casings following their own internal standards. Their steel grades may include NC-55E, NC-80E, NC-L80, NC-80HE, and others.
During quality inspections, common issues reported include damaged black or thread couplings, folded tube bodies, excessive distance between broken couplings and threads, poor coupling J values, surface defects, brittle sleeves, and low yield strength. These problems can affect the integrity and performance of the casing in drilling operations.
This information is sourced from industry reports, technical specifications, and supplier documentation.