Characteristics and Classification of API 5CT Oil Casing

API 5CT oil casing pipe can be divided into R-1, R-2 and R-3 specifications according to the different length. The main material is J55 K55 N80 L80 P110 and so on. In the extreme high temperature and high pressure environment, the pipeline made of petroleum casing has its own unique advantages. API 5CT petroleum casing shall undergo flattening test, tensile test, impact test, tensile test and other related inspections from raw material to product before delivery.

API 5CT petroleum casing, API 5L petroleum line pipe standard, petroleum casing is made of high-quality seamless steel tube, electric welded steel pipe and hot-rolled steel pipe as raw materials, which are made by CNC wire. The coupling adopts the international advanced pure manganese high temperature phosphating process, the phosphating film has strong bonding force, uniform and dense crystal, high hardness, corrosion resistance and strong anti-sticking ability. The product has been inspected by Xi’an Petroleum Pipe Research Institute, and all performance indicators meet the standard technical requirements. ASTM steel pipe can be divided into different steel grades according to the strength of the steel itself, namely J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc.Different well conditions and depths have different steel grades. In a corrosive environment, the casing itself is also required to have corrosion resistance. The pumping pipe mainly transports the oil and gas at the bottom of the oil well to the ground.

Thread connection form: short round threaded casing (STC); long round threaded casing (LTC) partial trapezoidal threaded casing (BTC); direct-connected casing (XC) non-thickened tubing (NU); outer thickened tubing ( EU); integral joint tubing (IJ).

Different types of casing used in the process of oil extraction:
Surface oil casing: protect the well from being contaminated by shallow water and gas layers, support wellhead equipment and maintain the weight of other layers of the casing.
Technical oil casing: Separate the pressures at different levels so that the drilling fluid can circulate normally and protect the production casing. Install anti-burst devices, leak-proof devices and liners in the well.
Reservoir oil casing: to export oil and natural gas from the reservoir below the surface. It is used to protect wells and layer drilling mud. When petroleum casing is produced, the outer diameter is usually 114.3 mm to 508 mm.
According to SY/T6194-96 “Petroleum Casing”, the types and packaging of petroleum casing are divided into short-threaded casing and its coupling and long-threaded casing and its coupling.

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