基于生化双膜工艺的油田采出水处理与资源化

针对胜利油田油井采出水处理负荷过大但锅炉用水短缺的问题,对油井采出水进行生化双膜工艺处理,处理后的产水用于锅炉给水,浓水用于低渗油田回注.开展了规模为200m3?d-1的中试实验,重点研究了超滤进水悬浮物与超滤膜污染的关系,考察了反渗透进水压力、进水温度对产水率、膜通量和透盐率的影响.结果表明:生化处理后的油田采出水中...

Preparation of boiler water by biochemical double membrane process treating oilfield produced water

Aiming at the problem of excessive load of oil well produced water treatment in Shengli Oilfield and shortage of boiler water, the oil well produced water was treated by a biochemical double membrane process. The treated water was used for boiler feeding water and the concentrated water was used for low permeability oilfield reinjection. A pilot experiment with a scale of 200 m3·d−1 was conducted to mainly study the relationship between the suspended solids in ultrafiltration influent and ultrafiltration membrane fouling, and the effects of the pressure and temperature reverse osmosis inlet on water production rate, membrane flux and salt penetration rate. The results show that the content of suspended solids in the treated oilfield produced water by biochemical treatment was irrelevance to the rate of membrane fouling, and the increase rate of transmembrane pressure ΔP was 0.000 046 2 MPa·d−1. The increase of the pressure of reverse osmosis inlet resulted in the increase of water production and membrane flux and the decrease of the salt permeability. The increase of the inlet water temperature elevated the water production rate, the membrane flux and the salt permeability; the oil content of the produced water after biochemical treatment was 0.63 mg∙L−1. The suspended solids after ultrafiltration was 0.2 mg∙L−1, and the conductivity of the water produced after reverse osmosis was 81~245 μS∙cm−1, which can meet the requirements for oil content, suspended solids and salinity in the boiler feeding water design specification of SY/T 0097-2016.