Oil casing is the pipe wall, used to support the oil and gas, to ensure normal operation of the post-completion wells at the drilling process. Each well, depending on the depth of drilling and geological conditions, should use several layers of casing. After set down casing will be cementing. Different form tubing and drilling pipe, it cannot be reused, a one-time consumable materials. Therefore, the consumption accounts of casing are over 70 % of all oil well pipes. Casing, according to usage, can be divided into catheter, surface casing, intermediate casing and production casing.

Oil Casing Pipes

OCTG is the abbreviation of Oil Country Tubular Goods, it mainly refers to the piping products that applied in the oil and gas production (drilling activities). OCTG pipe normally is manufactured based on API or related standard specifications. It also could be taken as a collective name of Drill pipe, Steel Casing Pipe and Tubing pipe, Couplings, Connections and Accessories, used in petroleum industries that onshore and offshore.

According to the API (American Petroleum Institute) standardized specifications, through the control on the chemical properties and adopts different heat treatment, OCTG pipe is classified into different performances material more than ten grades.

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