A method for advanced treatment of ASP flooding produced water with micro-bubbles

Abstract

The present invention relates to a method for deep treatment of produced water of ASP flooding with micro-bubbles. The method comprises the steps of sewage filtration to remove suspended solids ≥ 40 μm; electromagnetic anti-scaling; generation of micro-bubbles, mixing of micro-bubbles and water, and pressurization of sewage jets. , Suspension of oil droplets and microbubble coalescence, cyclone separation as a treatment unit, according to the microbubble particle size <4μm, <10μm, <25μm, <60μm, respectively generated and used, the sewage treatment is divided into corresponding The processing units are processed step by step from small to large. The microbubbles of each level of treatment unit occur at this level; the microbubbles mix and coalesce with the oil beads and suspended particles; the hydrocyclone separates the oil-water cyclone; the invention uses mechanical or physical methods to treat sewage, which is technically economical Good performance, safety and environmental protection, suitable for advanced treatment of ASP flooding produced water, polymer flooding produced water, heavy oil produced water, also suitable for the treatment of other similar sewage containing fine suspended solids, highly emulsified and high viscosity.

Description

technical field [0001] The invention relates to the treatment of the produced water of the three-element compound flooding, in particular to a method for deeply treating the produced water of the three-element compound flooding with micro-bubbles. The method can also be applied to the treatment of polymer flooding produced water, heavy oil produced water or other similar sewage containing fine oil droplets and suspended matter, highly emulsified and high viscosity. Background technique [0002] At present, all oilfields are gradually adopting polymer flooding technology in order to further enhance oil recovery, and are developing towards ASP flooding. Compared with polymer flooding, ASP flooding adds strong alkaline surfactants. Under the action of multiple chemical agents, the emulsification strength of the produced fluid is stronger, the interface properties become more complicated, the solid content of suspended solids increases, the particle size becomes finer, and oil-...

AI Technical Summary

Problems solved by technology

However, it still cannot meet the requirements of polymer flooding water injection in the middle permeation layer with an oil content of 15mg / L, a suspended solid content of 15mg / L, and a particle size of suspended solids of 3μm.

Not to mention the water quality standard of 5 mg / L of oil, 5 mg / L of suspended solids, and 1 μm of suspended solids in the injection water of polymer flooding in the low-permeability layer

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