Oily sewage treatment agent for oilfield

Abstract

The invention discloses an oily sewage treatment agent for oilfields. The content and mass ratio of its components are as follows: sodium hydroxide 0.2%-0.5%, heavy metal removal agent 1%-2%, hydrogen peroxide 1.5%-2%, polyethylene Imine 0.1%‑1.5%, aluminum sulfate 0.8%‑1.5%, calcium hypochlorite 0.1%‑0.3%, nano titanium dioxide 0.5%‑1%, peppermint extract 0.1%‑0.3%, zeolite 0.3%‑0.5%, Simethicone 0.2%‑0.4%, the rest is water. Its advantages are: the oilfield oily sewage treatment agent of the present invention aims at the high content of COD, suspended solids, chroma, heavy metals, etc. in oilfield sewage, and adjusts the pH value, removes heavy metals, reduces organic matter, decolorizes and purifies, flocculates and precipitates, hydrophobicizes, etc. Modification, solid-liquid separation; After oily sewage treatment in the oil field, through the four-stage fine filtration link, the low-energy-consumption filter press system can be used instead of the high-energy-consumption centrifugal system, so that the water quality can meet the environmental protection standards for reuse or reinjection. Reduced processing costs. It fundamentally solves the environmental pollution risk of oilfield sewage, which is in line with the national environmental protection, energy saving and emission reduction policy.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an oily sewage treatment agent for oil fields. Background technique [0002] The composition of oily wastewater from oilfields is very complex. The main sources of its wastewater are drilling wastewater, well washing wastewater, acidified fracturing fluid wastewater and production fluid, etc. Some oil extraction wastewater has a variety of components. The water contains a large amount of crude oil, soluble salts and heavy metals, and suspended emulsified oil. , solid particles, hydrogen sulfide and other natural impurities. In addition, it contains some additives used to change the properties of produced water and acids, corrosion inhibitors, viscostabilizers, bactericides, and scale inhibitors injected into the formation. The content of COD, suspended solids, chroma, heavy metals, etc. is high, and the treatment is very difficult. At present, the COD and heavy metal c...

AI Technical Summary

Problems solved by technology

At present, the COD and heavy metal content of oily wastewater from oilfields treated by existing treatment agents are still high, which only meets the requirements of reinjection, but fails to meet the standard treatment, and fails to meet the standard requirements for water quality discharge. If it is discharged outside, it will seriously pollute the environment.