Casing: It is mainly used to support the well wall during the drilling process and after the completion of the well to ensure the drilling process and the normal operation of the whole well after the well.This application of API oil well tubing is the lifeline to maintain the operation of the well.Due to the different geological conditions, the downhole stress state is complicated, and the tensile, compressive, bending and torsional stresses are combined to the tubing, which puts a higher requirement on the quality of the casing itself.
Oil pipe: mainly transports oil and gas from the bottom of the oil well to the surface. The role of oil pipe in the oil well is critical, it needs to be able to withstand high pressure and corrosive environment to ensure the effective delivery of oil and gas.
Drill pipe: It is mainly used for connecting drill collars and drill bits and transmitting drilling power. Drill pipe plays a vital role in transmitting drilling power and drilling fluids, and its performance and quality directly affect the efficiency and safety of drilling operations.
API standards for the production of oil well pipe mainly include API Spec 5CT 'Specification for Casing and Tubing' and API Spec 5DP 'Specification for Drill Pipe'. These standards stipulate the materials, specifications, performance requirements, etc. of oil well pipes to ensure the quality and safety of oil well pipes.
