There are two main differences between
oil casing and oil drill pipe: 1. Different uses; 2. Different materials.
Oil casing is a steel pipe used to support the walls of oil and gas wells to ensure the normal operation of the entire oil well after the drilling process and completion. Each well uses several layers of the casing according to different drilling depths and geological conditions. Cement cementing is used after the casing is lowered into the well. Unlike oil pipes and drill pipes, it cannot be reused and is a one-time consumable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes. The casing can be divided into conduit, surface casing, technical casing, and oil layer casing according to usage.
Rods connected to drilling tools to transmit power. The usual components of the drill string are drill bit, drill collar, drill pipe, stabilizer, special joint, and kelly. The basic functions of the drill string are: (1) lifting the drill bit; (2) applying drilling pressure; (3) transmitting power; (4) transporting drilling fluid; (5) performing special operations: squeezing cement, dealing with downhole accidents, etc.
API standard E75 to S135 steel grades, a series of oil drill pipes with outer diameters from 2 3/8″ to 6 5/8″ and double shoulder joint drill pipes with high torsion resistance and special steel for sour oil wells Grade BNK C95S drill pipe. It is mainly suitable for the construction of deep wells, horizontal wells, and extended-reach wells in the process of oil and gas exploration and development.
