胜利油田污水生化处理技术进展

Technological progress in biochemical wastewater treatment in Shengli Oilfield

为了减轻油田污水对环境的影响,充分利用污水资源,减少清水用量,胜利油田开展了油田污水生化处理技术研究和试验,同时配套其他工艺,对污水进行精细处理,实现低渗透油田污水的回注和油田污水达标外排。针对低渗透油藏回注污水难以达标的问题,应用生化处理配套精细过滤的污水精细处理工艺,在大芦湖油田樊41块进行了试验性的应用,处理后水质达到A1级标准。针对油田含聚污水难以处理的问题,应用生化处理技术降低污水化学耗氧量,处理后水质达到环保要求排放的标准。室内研究和现场试验结果表明,只要选用合适的微生物,油田污水可以进行生化处理。

Research and experiment are conducted on the technologies used in biochemical wastewater treatment to alleviate the influence of oilfield sewage on the environment, fully use waste water, and reduce the use of fresh water, Other systematic processes and technologies are combined to be used in wastewater treatment, which helps to realize the wastewater reinjection in low - permeability oilfields and enables the oilfield wastewater to meet the discharge standard. In view of the problem that the wastewater reinjection in low - permeability does not easily meet the standard, the fine wastewater treatment process, based on biochemical treatment and fine filtration, is experimentally applied to Block Fan41 of Daluhu Oilfield. The wastewater disposed reaches Grade A1 of the standards. To solve the treatment difficulty of polymer - contained wastewater, the biochemical treatment technology is used to reduce the chemical oxygen consumption of wastewater. As a result, the wastewater disposed reaches the environmental protection standard. Lab research and field experiment results show that oilfield wastewater can be treated with biochemical methods as long as favorable microbes are selected and applied.