艾哈代布油田高含硫采出水曝空气除硫中试研究

摘要

Corrosive produced water with high concentration of sulfide in Ahdeb Oilfield can generate FeS precipitation that can cause under scale corrosion and tubing plugging.The pilot field study on aer-ation for sulfide removal is carried out based on previous laboratory-scale research. The result shows that when the aeration column microbubble generator is used and the gas-liquid ratio reaches 16:1, the concentration of sulfide in produced water can be lowered to 10 mg/L from 80 mg/L; when the jet mixer and the U-shape tube aeration device are used and the gas-liquid ratio reaches 6:1, the con-centration of sulfide in produced water can be decreased to 15 mg/L from 80 mg/L; the two methods are used to continuously increase the gas-liquid ratio, and the sulfide removal effect is not increased;the pH value of produced water increases to a near neutral status after sulfide removal, and the residual dissolved oxygen in produced water can decline to within 0.05 mg/L during standing process.%艾哈代布油田高含硫腐蚀性采出水易形成FeS沉淀加快垢下腐蚀并堵塞油管.在前期实验室研究的基础上开展了曝空气除硫现场中试研究.试验结果表明,采用曝气柱微气泡发生器,当气液比达到16:1时,可将采出水中含硫质量浓度由80 mg/L降至10 mg/L;采用喷射混合器-U形管曝气装置,当气液比达到6:1时,可将采出水中含硫质量浓度由80 mg/L降至15 mg/L;采用两种方式继续提高气液比,不再提高除硫效果;采出水除硫后pH值增大至近中性,残留溶解氧在静置过程中可逐步降至0.05 mg/L以内.