高含盐水利用余热浓缩减排技术试验研究

Experimental Study on High Salinity Water Emissions-reduction Technology Based on Waste Heat Utilization

风城油田稠油以SAGD开采方式为主,对蒸气过热度提出了更高要求。目前生产区域采出液余热利用效率低,系统排放高含盐水得不到有效处置。文章通过对地面水-热综合系统分析,提出高含盐水利用余热浓缩减排的技术路线,采用空气蒸发技术实现高含盐水减量化,水蒸发进入空气,空气中水蒸气冷凝回收。现场试验结果表明:采用该技术可实现采出液所携带的低品质热能再利用,能将高含盐水转化为满足锅炉用水指标的冷凝水,其高含盐水减量>60%,冷凝水矿化度≤600 mg/L,水处理成本<10元/m3。

Heavy oil in Fengcheng oilfield is mainly produced by SAGD,which requires higher steam superheat. The waste heat utilization of the produced liquid is low, and the high salinity water discharged can hardly be effectively disposed. Based on the analysis of surface water and heat system, this paper put forwards the technical route of high salinity water emission reduction by using waste heat. Air evaporation technology was used to reduce the high salinity water, water evaporates into the air, and water vapor in the air is condensed and recovered. The relevant field tests were carried out, and the results show that the technology could realize the utilization of waste heat of produced liquid. It could convert high salinity water into condensate water meeting the boiler water index. The reduction of high salinity water was more than 60%,the salinity of condensate water was less than 600 mg/L,and the treatment cost per ton of water was less than 10 yuan/m3.