碱性钡锶垢除垢剂的性能研究

Performance Evaluation of Alkaline Detergent for Barium and Strontium Sulfate Scale

李年银 贺代兰 赵立强 张航 余瑞青 徐昆

LI Nianyin HE Dailan ZHAO Liqiang ZHANG Hang YU Ruiqing XU Kun

为克服现有硫酸盐除垢剂的不足，增加螯合剂与添加剂之间的协同作用，提高除垢效率，研制了一种以螯合剂为主剂的碱性除垢剂SA-209，考察了除垢剂浓度、除垢时间、pH值、温度、盐浓度对硫酸钡锶垢除垢率的影响。结果表明：随SA-209 浓度、除垢时间和温度的增加，除垢剂对钡锶垢的除垢率先增加后逐渐趋于稳定；随pH值的增加，除垢率先增加后降低；随溶液中KCl浓度的增加，除垢率缓慢减小。SA-209 对钡锶垢除垢的最佳使用条件为：加量4%～12%、除垢时间4～12 h、溶液pH值11～12、除垢温度80～120℃。SA-209 对硫酸钡和硫酸锶的除垢率约为55%和65%，对以硫酸钡垢为主要成分的海上油田垢样的除垢率为72.4%；4%和12%的SA-209对N-80 钢片的腐蚀速率分别为0.2022 和0.4412 g/（m2·h），明显低于行业标准。SA-209 具有除垢率高，对设备、管柱腐蚀低的特点，适用于酸液难溶垢的处理。图6 表2 参19

In order to overcome the shortcomings of existing sulfate scale detergent and increase scale removal rate by enhancing the synergistic effect between chelating agent and additives，a kind of chelating agent-based alkaline detergent named as SA-209 was developed. The effects of SA-209 concentration，descaling time，pH value，temperature，and salt concentration on the scale removal rate for barium and strontium sulfate scale were evaluated. The results showed that with the increase of SA-209 concentration， descaling time and temperature，the scale removal rate of SA-209 to barium and strontium sulfate scale increased first and then gradually stabilized；with the increase of pH value，the scale removal rate increased first and then decreased；and with the increase of KCl concentration in the solution，the scale removal rate decreased slowly. The optimum descaling condition of SA-209 to barium and strontium sulfate scale was obtained as follows：4%—12% SA-209 dosage，4—12 h descaling time，11—12 pH value，80—120℃ descaling temperature. The scale removal rate of SA-209 to barium and strontium sulfate was about 55% and 65% respectively，and to scale sample in offshore oilfield with barium sulfate as the main component was 72.4%. The corrosion rate of 4% and 12% SA-209 on N-80 steel sheet was 0.2022 and 0.4412 g/（m2·h）respectively，which was significantly lower than that in industry standard. SA-209 had high scale removal rate and low corrosion to equipment or tubing which was suitable for the scale undissolved by acid.

10.19346/j.cnki.1000-4092.2016.03.032