In the whole process of oil and gas exploration, drilling, transportation, refining and long-distance transportation to the user, steel pipes are inseparable, and oil and gas drilling is the largest professional user of seamless steel pipes. The most consumed oil casing is generally made of carbon manganese steel and low alloy steel with yield strength of 400-800MPa. For acidic gases (C02, C02 + H2S) and chloride ions (CL-) corrosion of oil and gas wells, it is necessary to use corrosion-resistant stainless steel or even to use nickel-based alloys for oil casing and transport tubes, which is stainless steel in the oil and gas development has a wide range of prospects in the field.
Such as the corrosion of CO2 in the oil and gas extraction process, has emerged in the 1950s, the past is the use of adding corrosion inhibitors to alleviate the approach. But there has been an unstable effect of corrosion inhibitors, the effect is worse when the temperature is high; pollution of the environment and life cycle costs than stainless steel and a series of problems. With the depletion of oil and gas resources, the oil and gas wells with corrosive environment previously abandoned need to be re-explored, especially from the early 1970s since the oil crisis, with the full development of marine oil and gas (accounting for 44% of global oil and gas reserves), C02 corrosion problems more prominent, become the focus of research in the oil and gas development in the last 20 years to prevent corrosion. Until the 1980s, especially in the development of the North Sea oil field, the use of duplex stainless steel is a complete solution to the long-term survival.