Advancements in Seamless Steel Pipes for Challenging Oil and Gas Environments

oil casing columns are crucial components in oil and gas wells, with a single casing issue having the potential to compromise the entire well. as conventional oil and gas resources are depleting, the exploration of unconventional resources like deep-sea, horizontal, heavy oil, and shale gas has become imperative. however, extracting these resources poses extreme challenges, including deep burial, high geological pressure, elevated temperatures, and the presence of corrosive gases such as h2s and co2. these demanding conditions necessitate advanced seamless steel pipes and key technologies for oil casing, playing a pivotal role in ensuring national energy security.

key technological innovations:

optimized steel composition:

developed a series of steel compositions tailored for various harsh operating conditions.

overcame challenges in clean steel smelting, precise composition control, impurity control, precise calcium treatment, and high-purity, high-homogeneity ingot continuous casting technology.

achieved steel with total oxygen content ≤10ppm, 90% of impurities with sizes smaller than 10μm, and a cross-sectional carbon extreme difference of ≤0.03% in continuous casting ingots.

precision forming of hot-rolled seamless steel pipes:

overcame challenges in the precise forming and integrated control of the structure of hot-rolled seamless steel pipes.

controlled ellipticity within 0.4%, wall thickness tolerance within ±5%.

improved crush resistance by 75% over api standards, with 0°c impact energy exceeding 100j for 170ksi steel grade casing and 120j for 150ksi steel grade casing.

achieved a steel grade of 125ksi for h2s corrosion-resistant oil casing, with a yield strength fluctuation within 42mpa, a 98% ssc pass rate, and a uniform corrosion rate as low as 0.0079mm/a for co2 corrosion-resistant oil casing.

special threaded connections:

developed special threaded connections with large included angle, large cone angle, and short sealing structure.

resolved the global challenge of threaded connections prone to disengagement or deformation.

established a corrosion medium-temperature-pressure-material testing evaluation system based on the analysis of different oil and gas field service environments, supporting the rational selection of materials for oil and gas wells in complex conditions.

the project received support from major scientific and industrial initiatives in hunan province, including the "high-quality special seamless steel pipe economic cleanliness research and application" and the industrialization of the "hs series new type special oil and gas dedicated pipe." with 27 granted patents, leadership in formulating two standards, and the publication of 13 papers, the project has demonstrated substantial success.

over the past three years,hengyang valin steel tube co., ltd. has sold 1.38 million tons of products, generating an additional output value of 10.15 billion yuan, earning 530 million us dollars in foreign exchange, and supplying products to over 30 renowned domestic and international oil and gas companies. the project's products have set new records in extreme applications, refreshing records for the deepest wells, longest horizontal wells, deepest onshore horizontal wells, and longest fractured horizontal sections in shale gas wells, garnering international acclaim for achieving leading technological standards in corrosion resistance, high strength, toughness, and crush resistance. the evaluation committee unanimously concluded that "the overall technology of this achievement has reached the international advanced level, with major technical indicators such as corrosion resistance, high strength, high toughness, and high crush resistance reaching international leading levels."

centerway steel co., ltd. has established a good cooperative relationship with the famous domestic professional seamless pipe manufacturer--"hengyang valin steel tube" enterprise. it is the first-level agent of hengyang valin steel tube co.,ltd and provides you with one-stop total pipe solutions.

centerway is committed to providing one-stop service for steel pipe products to customers around the world.