Casing
- Grade: K55, L80, P110, Q125
- Standard: API 5CT
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Descriptions
What is the Casing
Casing pipe is the pipe, which is used to support the oil and gas well wall, in order to ensure that the drilling process and the normal running of the whole well after completion. According to different drilling depth and geological condition, every well uses several layers of casing.
Casing is different from tubing and drill pipe after using. Casing is the one-time consumption materials and can’t be repeated use. So the consumption of casing is accounted for more than 70% of the total oil well pipe. Casing is the oil special pipe which is mainly used in oil and gas well drilling and oil and gas transportation. Casing includes petroleum drill pipe, oil casing and oil-well tubing. Petroleum drill pipe is mainly used to connect the drill collar and drill at the same time transmits drilling power. Oil-well tubing mainly transfers the bottom of the oil and gas to the ground.
Applications of Casing
Oil casing is a kind of large diameter pipes and play an important role to fix oil and gas well wall and well hole. Casing is inserted into the well hole and fixed with cement in order to prevent the borehole and separated strata borehole collapse and ensure drilling mud circulating flow and drilling.
Steel casing pipe is lifeline to maintain oil wells running. Due to different geological conditions, underground stress state is complex like tension, pressure, bending, and torsion stress to require the casing with higher quality. Once the casing is damaged due to some reasons, which will lead to the whole production of the well or even scrapped. According to steel strength, casing can be divided into different steel grades: K55, L80, P110, Q12 etc. The steel grade is in different way due to different oil well conditions and depth. In corrosive environment, casing is required to have good corrosion resistance.