关键词: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">电场, 重质原油, 脱盐脱水, 盐含量, 总氯, 电压, 正庚烷可溶物, 正庚烷不溶物

Abstract: The current electric desalination technology is prone to many problems during the processing of heavy crude oil, such as salt content and excessive water content after crude oil desalination. This article explores the influence of voltage on the desalination and dehydration processes of heavy crude oil, providing theoretical support for solving the desalination problem of heavy crude oil. Based on the analysis of the relationship between crude oil composition and salt content, total chlorine, as well as the effect of applied voltage on desalination and dehydration of crude oil, the following conclusions can be drawn. Salt and total chlorine in crude oil are mostly enriched in n-heptane insoluble substance (HI), and the higher the content of HI in crude oil, the higher the proportion of chlorine in HI. 92.5% of total chlorine in crude oil exists in HI. Under the same electric field intensity, the higher the HI content of crude oil, the greater the effect of voltage on its desalination and dehydration. For crude oil with a HI content of 15.82%, when the voltage is increased from 1300V to 1500V, the NaCl mass concentration of crude oil is increased from 8.78 mg/L to 10.25 mg/L, and the water content is increased from 0.43% to 1.37%. Polar components such as HI in crude oil will move under the action of an electric field, and high voltage will cause the aggregation of HI in the electric field area, exacerbating their emulsification with water and increasing the difficulty of demulsification, especially for crude oil with high HI content.

Key words: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">electric field, heavy crude oil, desalination and dehydration, salt content, total chlorine content, voltage, n-heptane soluble substance, n-heptane insoluble substance