Study on Affecting Factors and Mechanism of Oil Tubing Corrosion in Northern Shaanxi Oil Field

Abstract

Tubing corrosion is a difficult problem in oilfield production. In order to explore the main factors influencing the tubing corrosion, this study first select some region of northern shaanxi 28 Wells, spent nearly 2 years of tubing corrosion weightlessness method of monitoring and analysis of physical and chemical properties of produced fluid to conduct a comprehensive system, then SPSS program is used to analyze the 11 influence factors such as temperature, moisture content, pH and the correlation of corrosion, at the same time in order to verify the accuracy of the statistical analysis of the results, the spot corrosion coupon for scanning electron microscopy (SEM) and energy spectrum analysis. The results show that the water content, chloride ion and sulfide of the produced fluid are relatively high, and the water quality is alkaline. Through grey correlation calculation, the correlation degree with corrosion rate is 0.8386, 0.8281 and 0.8281, respectively. The results of scanning electron microscopy and energy spectrum analysis are basically consistent with the statistical analysis, indicating that the property of produced fluid can be used to predict the corrosion status of tubing.