摘要
针对长庆油田油井套管腐蚀问题 ,采用并评价了真空渗氮工艺。该工艺处理套管表面形成氮化层 ,在不降低原有机械性能的前提下提高了表面耐磨、抗蚀能力。经室内、现场试验发现 ,渗氮管在长庆油井腐蚀情况下的耐腐蚀性能优良。此外 ,还就渗氮层在不同弯曲、拉应力条件下的微观表面变化对使用性能的影响进行了研究 ,确定了渗氮套管下井条件。并于 2 0 0 3年首次在 2口井得以应用。
Vacuum gas nitriding (VGN) technology was adopted and evaluated for well casing to against the corrosion in Changqing oilfield.A uniform protective nitriding layer is formed on the surface of well casing treated by the technology so that the wear and corrosion resistance are improved with origin mechanical properties.Lots of indoor and field tests prove that VGN oil tubing has outstanding anti-corrosive property in corrosive environments of Changqing oilfield.Besides the effects of microscopic surface of nitriding layer under various bending and tensile stress were investigated,and then downhole qualificating of VGN well casing was determined.VGN oil well casing was applied to two wells in 2003 firstly.The VGN technology provides a new idea for corrosion protection of well casing used in oilfield with low field and low infiltration.
出处
《材料保护》
CAS
CSCD
北大核心
2004年第9期36-38,51,共4页
Materials Protection
关键词
腐蚀
油井套管
真空渗氮
耐腐蚀性能
井下试验
corrosion
oil well casing
vacuum gas nitriding
corrosion resistance
downhole test
