Oil casing pipes are the lifeline which keep oil wells running. Oil casing pipe are needed to bear the complicated force coming from pulling, pressing, curving and twisting under oil well, because of the different geological conditions. Therefore, the high quality of oil casing pipe is necessary. Once the oil casing pipe is damaged for some reasons, it may lead to reduction of output for oil well, even it becomes useless.
13 3/8 casing pipe is a kind of pipe with large diameter, which immobilizes the wall and pit of oil and gas well. Oil casing is used to insert into the oil pit and immobilized with cement, to prevent the well from stratum and collapse, make sure the circular flow of the drilling mud for drilling.
OCTG casing pipe is steel pipe that is used to support walls of oil and gas well and assures the operation in and after the drilling process. We need to use several layers of casings based on the different drilling depth and geological conditions for each oil well. We should use cement to immobilize the oil casing after being put in the oil well. Oil casing can’t be reused, and it belongs to disposable material, which is different from oil pipe or drill pipe. So the consumption of oil casing makes up 70% of the whole oil pipes. Oil casing can be classified into conductor casing, surface casing, intermediate casing, production casing according to its using.