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根据涠洲油田群生产污水的来源情况,对各油田不同区块代表性油井的产出水进行了水质分析,明确了不同油田不同层位地层水的性质,并根据各油田不同年份产水量预测及注水量需求,确定不同时期生产污水水样中各油田产出水的混合比例,模拟配制代表性水样。在对代表性水样水质分析的基础上,重点对生产污水的结垢、腐蚀进行了系统评价。研究结果表明:涠洲油田群不同时期代表性生产污水自身和与地层水混合后均具有结碳酸钙垢和硫酸钡垢的趋势;代表性的生产水样自身结垢量均在310mg/L以上,与地层水混合后,结垢量明显增加;腐蚀以氧腐蚀和细菌腐蚀为主。若进一步增加污水处理设备,优选防垢和防腐剂,使处理后的生产污水水质达到合适的指标,作为储层注入水水源是可行的;生产污水作为注入水水源既能满足节能减排的要求,又有利于保护海洋环境。
According to the sources of production wastewater in Weizhou oilfield, the water quality of produced water from different wells in different oilfields was analyzed, and the properties of formation water in different layers of different oilfields were clarified. According to the prediction of water production in different years in each oilfield And water injection needs, determine the different stages of the production of sewage water samples of the oil-water mixture ratio, the preparation of a representative simulation water samples. Based on the analysis of water quality of representative samples, the scale and corrosion of production wastewater are systematically evaluated. The results show that the representative production wastewater of Weizhou oil field has the trend of inducing calcium carbonate scale and barium sulfate scale on their own and mixed with formation water at different periods. The representative scaling scale of production water sample is above 310mg / L After mixing with formation water, the amount of fouling increased obviously. The corrosion was dominated by oxygen and bacteria. If we further increase the sewage treatment equipment, preferably anti-scaling and preservatives, so that the treated water quality to meet the appropriate indicators of the production of water as a reservoir into the water is feasible; as a source of water into the production of sewage can meet the energy-saving emission reduction requirements , But also conducive to the protection of the marine environment.