关键词: 稠油开采, 产出水处理, 现场中试, 回用, 热采锅炉, 软化, 离子交换

Abstract: The water produced from heavy oil recovery was treated and recycled to thermal boilers.Its field pilot was conducted.The technology process and parameters for the produced water recycled to the thermal boiler were presented.The selection of softening process,reduction of hardness and removal methods of silica,suspended solid and total ferrous concentration were analyzed.The disposal cost and cost benefit were discussed.After coagulation and sedimentation,the concentration of silica in the produced water was below 40 mg/L,and the tatal hardness was less than 70 mg/L,and the total ferrous concentration was below 0.05 mg/L when pH value was controlled in the range of 8.5 to 9.5 and the concentration of MgCl₂ additive was 200 mg/L.The strong and weak resins could effectively reduce the hardness of the produced water,but couldn't evidently remove silica.Compared with the weak resin,the strong resin had the characteristics of long regeneration period,simple operation and low cost.The field pilot tests demonstrated that the produced water treated in coagulation and sedimentation tank,dual mediums filter and strong acid resin exchanger could be recycled to the thermal boiler of oilfield.

Key words: heavy oil recovery, produced water treatment, field pilot test, reuse, thermal boiler, softening, ion exchanger