Abstract
Numerous studies have shown that corrosion of the casing outer side is one of the factors that has a negative impact on the accident rate of the casing string and is the reason of loss of tightness and various failures and complications in the well. The article describes a method of electric resistance welding of dissimilar steel bonding, which allows to increase the corrosion resistance of casing strings in elevator sections with an increased exterior aggressiveness. The developed technology solutions for welding conditions are presented. Metallographic studies of welded joints and recommendations for technological welding conditions are given.
Highlights
Corrosion is a common cause of oil field equipment and flow string failures [6, 12]
Numerous studies have shown that corrosion of the casing outer side is one of the factors that has a negative impact on the accident rate of the casing string and is the reason of loss of tightness and various failures and complications in the well
The article describes a method of electric resistance welding of dissimilar steel bonding, which allows to increase the corrosion resistance of casing strings in elevator sections with an increased exterior aggressiveness
Summary
Corrosion is a common cause of oil field equipment and flow string failures [6, 12]. Corrosion damage to casing pipes often occurs due to loss of cement integrity under the influence of groundwater. One of the main requirements for pipe steel is a combination of strength and plastic properties, high rate of impact elasticity, fatigue resistance and corrosion resistance. Among austenite and ferrite corrosion-resistant steels, duplex steels (DSS) stand out for their higher strength, toughness, corrosion resistance and heat conductivity. The object of the work is to study the possibility of building up a casing string from dissimilar steels (low-alloy and duplex steel), connected by electric resistance welding. For this purpose the structure of the material in the weld area as well as stress-strain properties and corrosion resistance were investigated
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