Introduction to oil casing

　　Oil casing is used to support the oil, gas shaft wall of the pipe to ensure that the drilling process and after the completion of the normal operation of the entire well. Each well according to the different drilling depth and geological conditions, to use several layers of casing. After the casing to take cement cementing, it is with the tubing, drill pipe is different, can not be reused, are a one-time consumption of materials. Therefore, the consumption of casing accounted for more than 70% of all oil wells.9 5/8" API Oil Casing Pipe according to the use can be divided into: duct, surface casing, technical casing and casing casing. The oil pipe is mainly used for oil and gas drilling and oil and gas transportation. It includes oil drilling pipe, oil casing, pumping pipe. The oil drill is mainly used to connect the drill collar and drill bit and pass the drilling power. The oil casing is mainly used in the drilling process and after completion of the support of the wall to ensure that the drilling process and after the completion of the normal operation of the entire well. The oil pipeline mainly transfers the oil and gas from the bottom of the well to the ground.