Main Import and Export Situation of Oil Casing Pipe

Casing is a large diameter pipe used as a fixed oil and gas well wall or wellbore. The casing is inserted into the wellbore and cemented to prevent the wellbore from separating the formation and collapsing the wellbore, and to ensure the circulation of drilling mud for drilling.
Surface oil casing can protect the well from shallow water and shallow gas pollution, and support the puncture equipment and maintain other layers of casing.
The purpose of technical casing is to separate the pressure at different levels so that the drilling fluid can flow normally and protect the production casing, so as to install explosion-proof device, leakage prevention device and liner in the drilling.
Oil and gas are mainly exported from the underground reservoir by the oil casing of oil reservoir, and the oil well is protected by liver, and the drilling mud is stratified. In the production of oil casings, the outside diameter is usually 114.3 mm to 508 mm.
The main importers of oil casings are: Germany, Japan, Romania, Czech Republic, Italy, Britain, Austria, Switzerland, the United States, Argentina and Singapore. Refer to API 5a, 5AX, 5AC for more import standards. The steel grades are H-40, j-55, N-80, P-110, C-75, c-95, etc. The main specifications are 139.77.72r-2, 177.89.19r-2 and 244. 58.94r-2, 244.510.03r-2, 244.511.05r-2, etc.
API has three lengths: 4.88-7.62m for R-1, 7.62-10.36m for R-2 and 10.36m for R-3. In addition to API standards, there are also a few Japanese factory standards imported from Japan (such as Nippon Steel, Sumitomo, Kawasaki, etc.). The steel grades are nc-55e, NC 80e, nc-l80, nc-80he, etc.
Some imported goods are marked with LTC, i.e. filament sets. In the case of the claim, there are problems such as black buckle, thread damage, pipe folding, buckle fracture and wire tightening distance, as well as the appearance of defects such as J value of the coupling and the inherent quality problems such as the sleeve. Cracking and low yield strength.