消泡-吸收法处理酸化返排液技术研究及应用

Research and Application of Defoaming Absorption Method for Treating Acidizing Backflow Fluid

酸化返排液中伴有大量氯化氢及泡沫,现场处理难度较大。采用消泡、填料塔吸收、碱液喷淋中和等技术对其处理,开展了吸收塔设计选型,优化了喷淋时间、喷淋量等工艺参数,并针对返排液泡沫量大等问题进行了消泡剂优选、消泡反应时间优化等。研究表明:当GX-2消泡剂用量为125 mg/L,反应时间为1.4 min,碱液喷淋时间为1.2 min,喷淋量为7.5 m^(3)/h时,处理效果较好。现场试验结果表明:当酸化返排液中氯化氢含量为300~720 mg/m3时,可调节消泡剂用量为100~125 mg/L,喷淋量为6.5~9.5 m3/h,处理后酸化返排液中氯化氢含量降低至5.7 mg/m^(3)以下,处理效果较好。该技术在现场完成了14 000 m^(3)酸液处理,处理后液体回用率为95%,具有良好的环保效应。

Treatment process became mroe difficult on acidizing flowback because of hydrogen chloride and foam exist-ing.Defoaming,packed tower absorption,spraying,neutralization and other technology has been carried out for process-ing acidizing flowback.Process parameters such as designing of absorption tower,spray time,spray volume defoaming agent reaction time was optimized.The results showed that the better treatment effect was obtained when the GX-2 defoaming agent dosage was 125 mg/L,the defoaming reaction time was 1.4 min,the lye spray time was 1.2 min,and the spray volume was 7.5 m3/h.The results of field test showed that when hydrogen chloride content is 300~720 mg/m3,the dosage of antifoaming agent could be adjusted to 100~125 mg/L and the spray volume to 6.5~9.5 m3/h.The con-tent of hydrogen chloride in the acidified flowback solution was reduced to below 5.7 mg/m3.More than 14000 m3 acid liquid was treatmented in the field,and the recovery rate of flowback is 95%,which has a good protection effect,demonstated the technology with good environment.