API: It is the English abbreviation of American Petroleum Institute, the Chinese meaning for the American Petroleum Institute.
OCTG: It is the English abbreviation of Oil Country Tubular Goods, Chinese meaning for the oil-specific pipe, including finished oil casing, drill pipe, drill collar, coupling, short and so on.
Tubing: Tubing used in oil wells for oil recovery, gas production, water injection and acid fracturing.
Casing: Pipe from the surface into the borehole wall to prevent collapse of the borehole wall.
Drill Pipe: A pipe used in a drilling hole.
A pipe used to transport oil or gas.
Coupling: A cylindrical body for connecting two threaded pipes and having internal threads.
A material used in the manufacture of couplings.
API Thread: API 5B standard pipe thread, including the tubing round thread, sleeve short round thread, casing long round thread, casing trapezoidal thread, pipe thread and so on.
Special buckle: non-API threaded buckle with special sealing, connection and other properties.
Failure: under the conditions of service in a particular deformation, fracture, surface damage and loss of the original function of the phenomenon. Oil casing failure of the main forms are: collapse, slippage, rupture, leakage, corrosion, bonding, wear and so on.
