Research on basic properties of steel used in OCTG casing

as the underground corrosion conditions of oil and gas field development become more and more complex, the corrosion resistance requirements for oil, casing and other materials in the petrochemical mining and transportation fields are getting higher and higher. oil casings are exposed to various corrosion conditions such as co2, h2s, ci-, etc. when serving in the underground high-temperature and high-pressure multi-phase environment of the medium, if corresponding protective measures are not taken, corrosion and perforation are often prone to occur, causing the pipe string to break down the hole, causing huge economic losses. at present, there are three main corrosion protection measures recognized at home and abroad, namely adding corrosion inhibitors, using anti-corrosion inner coatings and using corrosion-resistant alloys.

however, corrosion inhibitors and internal anti-corrosion coatings cannot fully achieve the expected results of the project, and corrosion-resistant alloy materials must be used together. in addition, corrosion inhibitors are prone to decomposition and denaturation in high-temperature and high-pressure environments. l80-9cr oil well pipe is api spee5ct-2018 "casing and oil pipe specification" steel grade, which belongs to the category of corrosion-resistant oil well pipe. it is a product that the company has not yet carried out research and production trial production. through the l80-9gr corrosion-resistant oil well pipe steel 08cr9movre analysis and research on the rolling properties and structure, heat-treated properties, high-temperature mechanical properties and corrosion resistance test results can lay the foundation for the trial production and mass production of l80-9cr oil well pipes.