Corrosion resistant and squeezing resistant casing pipe

Abstract

The invention discloses a corrosion resistant and squeezing resistant casing pipe which comprises the following components by weight percent: 0.15-0.25% of carbon, 0.15-0.3% of silicon, 0.50-1.0% of manganese, 2.80-3.20% of chromium, 0.01-0.05% of nickel, 0.15-0.35% of molybdenum, 0.01-0.05% of vanadium, 0.01% of aluminum and the balance ferrum. In the invention, a small amount of nickel, molybdenum and vanadium alloy elements are added on the basis of 2Cr3Mo oil casing pipe alloy, so that an oil well pipe with the strength grade reaching 80KSI / 95KSI steel grade is obtained, furthermore, due to the compound addition of the nickel, molybdenum and vanadium, the temper temperature of the steel is improved, and the lower temperature impact toughness of the steel is obviously improved; in addition, in the invention, content of the carbon is controlled, and the elements such as chromium, nickel, molybdenum and vanadium are added and are subject to suitable heat treatment, so that the casing pipe which can resist the corrosion of CO2 and chloridion at 120-150DEG C and resist H2S and squeezing is obtained. Compared with the series oil casting pipe materials such as low carbon, nickel and molybdenum, the casting pipe has the advantages that nickel can be saved by 2-3%, molybdenum can be saved by 1-2% and a certain amount of copper can be saved, thus the cost of the alloy is greatly reduced. The casing pipe can be widely used for occasions capable of CO2 resistance, H2S resistance and squeezing resistance at the same time, such as oil well pipes and the like.

Description

technical field [0001] The invention relates to an anti-extrusion casing, in particular to a corrosion-resistant and anti-extrusion casing for acid oil and gas fields. Background technique [0002] Oil and gas resources are important strategic materials, which are related to national economic and social development, as well as the security and stability of the entire country. In recent years, with the continuous and rapid development of my country's economy, the demand for energy is increasing. The next few decades will be the fastest growing period for my country's energy demand. According to the research report on China's sustainable development of oil and gas resources strategy and the 2007 Blue Book of the Chinese Academy of Social Sciences, my country's natural gas demand will grow rapidly in the next 15 years, with an estimated annual growth rate of 11% to 13%. In 2010, my country's natural gas demand gap is about 20 billion cubic meters m, by 2020 my country's natural...

AI Technical Summary

Problems solved by technology

However, for a long period of time in the past, some oil well pipe manufacturers in my country were limited by the metallurgical equipment and other conditions at that time, making the anti-CO 2 +Anti-H 2 The development of S+ anti-extrusion oil well pipe is difficult, and it is impossible to produce qualified anti-CO2 2 +Anti-H 2 S+ anti-extrusion casing products have long been monopolized by several major oil well pipe manufacturers such as Japan and Europe