WO2018086100A1

WO2018086100A1 - Oil wastewater treatment agent for oil field

Info

Publication number: WO2018086100A1
Application number: PCT/CN2016/105654
Authority: WO
Inventors: 张建华; 顾吉胜
Original assignee: 江苏华安科研仪器有限公司
Priority date: 2016-11-14
Filing date: 2016-11-14
Publication date: 2018-05-17

Abstract

An oil wastewater treatment agent for an oil field comprises the components in percentage by weight: 0.2% of 0.5% of sodium hydroxide, 1% of 2% of heavy metal removal agent, 1.5% of 2% of hydrogen peroxide, 0.1% of 1.5% of polyethyleneimine, 0.8% of 1.5% of aluminum sulfate, 0.1% of 0.3% of calcium hypochlorite, 0.5% of 1% nano titanium dioxide, 0.1% of 0.3% peppermint extract, 0.3% of 0.5% of zeolite,0.2% of 0.4% of dimethicone, and the balance of water. The oil wastewater treatment agent for an oil field has the advantages: for high contents of COD, suspended substances, colority and heavy metal of the wastewater in an oil field, pH adjustment, heavy metal removal, organic substance reduction, decoloration and purification, flocculation and deposition, hydrophobic modification and solid-liquid separation are carried out on the wastewater; after the oil wastewater are treated, a procedure of four-stage fine filtering can be carried correspondingly, a high-energy-consumption centrifugation system can be replaced with a low-energy-consumption filtering system, so that the water quality can reach standards for reuse or for being refilled in the treatment satisfying environmental protection requirements, thereby greatly reducing treatment costs. The environment pollution risks of the wastewater in the oil field are completely resolved, thereby satisfying important policies of the nation on environmental protection, energy saving and emission reduction.

Description

Oil field sewage treatment agent

Technical field

The invention relates to the technical field of sewage treatment, in particular to an oil sewage treatment agent for oil fields.

Background technique

The composition of oily wastewater in oil fields is very complicated. The main sources of wastewater are drilling wastewater, well washing wastewater, acid fracturing fluid wastewater and production fluid, which are diversified in composition. The water contains a large amount of crude oil, soluble salts and heavy metals, and suspended emulsified oil. Natural impurities such as solid particles and hydrogen sulfide, and some additives for changing the properties of produced water, acids, corrosion inhibitors, viscosity stabilizers, bactericides, scale inhibitors, etc., which are injected into the formation. COD The content of suspended solids, color, heavy metals, etc. is high, and the handling is very difficult. Oil field oily wastewater COD after treatment with existing treatment agent The heavy metal content is still very high, only meets the requirements of re-injection, and does not meet the standard treatment, which does not meet the standard requirements for water quality discharge. If the external discharge will seriously pollute the environment.

Summary of the invention

It is an object of the present invention to provide an oily sewage treatment agent for oil fields.

The technical solution adopted by the invention is:

An oil-field sewage treatment agent for oil field, the innovation is that the distribution ratio of its component content is: 0.2%-0.5% of sodium hydroxide, 1%-2% of heavy metal agent, 1.5%-2% of hydrogen peroxide, and poly Ethyleneimine 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% Dimethyl silicone oil 0.2%-0.4%, the rest is water.

Further, the heavy metal removal agent comprises 60% calcium oxide and 40% sodium hydrogen sulfite.

The beneficial effects of the present invention are as follows:

The oily oily sewage treatment agent of the invention has high content of COD, suspended matter, color and heavy metal for oilfield sewage in the case of a total addition amount of 3% of the chemical agent, By pHing it Value adjustment, heavy metal removal, organic matter reduction, decolorization and purification, flocculation and sedimentation, hydrophobic modification, solid-liquid separation; oil field oily wastewater treatment, combined with four-stage fine filtration, can replace high-energy centrifugal system with low-energy filter press system The water quality can reach the environmental protection standard treatment of the standard return or reinjection, which greatly reduces the processing cost. It fundamentally solves the environmental pollution risk of oilfield wastewater, and is in line with the national environmental protection energy conservation and emission reduction measures.

detailed description

Example 1

An oily sewage treatment agent for oil field, the component content content ratio of which is: 0.2% of sodium hydroxide, 1% of heavy metal agent, 1.5% of hydrogen peroxide, 0.1% of polyethyleneimine, 0.8% of aluminum sulfate, hypochlorous acid Calcium 0.1%, nano titanium dioxide 0.5%, peppermint extract 0.1%, zeolite 0.3%, dimethicone 0.2%, and the rest was water.

Example 2

An oily sewage treatment agent for oil field, the component content content of which is 100% sodium hydroxide, 0.5% of heavy metal agent, 2% of hydrogen peroxide, 1.5% of polyethyleneimine, 1.5% of aluminum sulfate, hypochlorous acid Calcium 0.3%, nano titanium dioxide 1%, peppermint extract 0.3%, zeolite 0.5%, dimethyl silicone oil 0.4%, and the rest was water.

Example 3

An oil field sewage treatment agent for oil field, the component content content of which is 100% sodium hydroxide, 0.3% of heavy metal agent, 1.7% of hydrogen peroxide, 0.12% of polyethyleneimine, 1.2% of aluminum sulfate, hypochlorous acid Calcium 0.2%, nano titanium dioxide 0.7%, peppermint extract 0.2%, zeolite 0.4%, dimethyl silicone oil 0.3%, and the rest was water.

The above is a preferred embodiment of the present invention and is not intended to limit the scope of the invention. It should be noted that those skilled in the art can make modifications or equivalent substitutions to the technical solutions of the present invention without departing from the scope of the present invention.

Claims

The utility model relates to an oil sewage treatment agent for oil field, which is characterized in that: the distribution ratio of the component content is: 0.2%-0.5% of sodium hydroxide, 1%-2% of heavy metal agent, 1.5%-2% of hydrogen peroxide, 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%, Dimethicone is 0.2%-0.4%, and the rest is water.
The oily sewage treatment agent for oil field according to claim 1, wherein the heavy metal removal agent comprises 60% calcium oxide and 40% sodium hydrogen sulfite.