Corrosion Cause Analyses of Underground Equipment in Nitrogen Gas Lift Foam Process

After nitrogen gas lift foam and profile logging, serious corrosion of oil tube and logging cable occurred in the Tahe oilfield. The corrosion rate of oil tube was measured in simulated environment of laboratory. The formation water, crude oil and blowing agent were measured, and the material quality, characterisitics of corrosion morphology, corrosion product, metallographic structure and hardness of oil tube and logging cable were analyzed respectively. Anticorrosion measures and suggestions were also put forward according to the analyses. The research results would be helpful to the application of nitrogen gas lift foam technique, and there is also certain guiding to oil field's anticorrosion work.