Oily sewage treatment agent for oilfield

Abstract

The invention discloses an oily sewage treatment agent for an oilfield, which comprises the following components in percentage by mass: 0.2-0.5% of sodium hydroxide, 1-2% of a heavy metal removal agent, 1.5-2% of hydrogen peroxide, 0.1-1.5% of polyethyleneimine, 0.8-1.5% of aluminum sulfate, 0.1-0.3% of calcium hypochlorite, 0.5-1% of nano titanium dioxide, 0.1-0.3% of a peppermint extract, 0.3-0.5% of zeolite, 0.2-0.4% of dimethyl silicone oil and the balance of water. The oily sewage treatment agent for the oilfield, provided by the inventio, has the following advantages: aiming at high contents of COD, suspended matters, chroma, heavy metals and the like of oilfield sewage, pH value adjustment, heavy metal removal, organic matter reduction, decoloration purification, flocculation precipitation, hydrophobic modification and solid-liquid separation are carried out on the oilfield sewage; after oily sewage in the oilfield is treated, a low-energy consumption filter pressing system canbe used instead of a high-energy consumption centrifugal system by matching of four stages of fine filtering links to ensure that the water quality can reach the standard for recycling or re-injectionof environmental protection standard treatment, and the treatment cost is greatly reduced. Therefore, the environmental pollution risk of the oilfield sewage is fundamentally solved, and the oily sewage treatment agent conforms to the national plans and policies of environmental protection, energy conservation and emission reduction.

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.