The invention discloses an oilfield poly-surfactant flooding
sewage treatment process, solving the problems that the conventional
settling and filtering process is long in
running time, large in floor area, high in
investment cost and the like. The oilfield poly-surfactant flooding
sewage treatment process comprises the following specific steps: 1, performing stabilizing regulation on
water quality and water amount of inflowing water by using an inflowing water
buffer tank; 2, removing oil slick and most of dispersed oil from water by using a primary swirling static flotation column; 3, mixing outflowing water obtained in the step 2 with a flotation agent through a pipeline, entering a secondary swirling static flotation column, and further removing the dispersed oil,
emulsified oil and
suspended solids from water; and 4, sending the
sewage treated in the step 3 into a two-stage double-filtering material filter, filtering till and the treated sewage reaches a pouring standard for a high-permeability strata, namely the
oil content is less than or equal to 20mg / L, the suspended
solid content is less than or equal to 20mg / L and the median particle size is less than or equal to 5 microns. By the oilfield poly-surfactant flooding
sewage treatment process, the oil removing time is greatly shortened, the floor area is reduced, only a little of flotation agent is added in a running process, the maintenance is simple, and the outflowing water is stable and qualified.