Multifunctional cleaning agent for oil fields, preparation method therefor and applications thereof

Abstract

The invention relates to a multifunctional cleaning agent for oil fields, a preparation method therefor and applications thereof. The cleaning agent is composed of 0.2%-1.0% of composite nonylphenol polyoxyethylene ether active agents, 0.2%-1.0% of composite quaternary ammonium salt positive ion active agent chlorides, 0%-1.0% of composite acid pickling corrosion inhibitors, 0%-1.0% of composite Fe ion chelating agents, 0%-10.0% of organic carboxylic ester, and the balance being water. The cleaning agent has good acidolysis solution removing effects on inorganic chemistry scales of CaCO3, Fe2O3 and FeS at the temperature of 60-80 DEG C, has dispersion and melting effects on oil stains, wax scales and heavy oil stains, has a killing effects on oil field fungi, has a peeling effect on sticky dirt, and is suitable for cleaning of devices of oil field production well shafts, gathering pipelines, oil and water separation settling tanks, flocculation settling tanks, oil storage tanks, sewage storage tanks and the like.

Description

Technical field: [0001] The invention relates to a multifunctional cleaning agent for oilfields and its preparation and application. It is suitable for the cleaning of wellbores of oil production wells, gathering pipelines, oil-water separation settling tanks, flocculation settling tanks, oil storage tanks, sewage storage tanks and other equipment. Background technique: [0002] The practice of oilfield development proves that during the whole process from the opening of the oil and gas layer at the first well to the end of the oilfield development, the fluids (oil, gas, water) in the oil reservoir flow out from the oil and gas layer, go through the wellbore and wellhead to the surface gathering and transportation System, fouling will occur in these different flow-through parts. In addition, the oilfield produced water treatment system is often found to have scaling phenomenon. [0003] 1. Wellbore condition of oil production well [0004] During the long-term production ...

AI Technical Summary

Problems solved by technology

[0015] The acid cleaning agent with hydrochloric acid as the main agent is mainly for CaCO 3 Mainly inorganic chemical scale, the main advantages of this type of cleaning agent are fast cleaning speed and short operation cycle, but the corresponding disadvantages are also obvious, that is, the corrosion of steel is very serious, and the protection requirements for operators are also very strict.

Using compound organic solvents as the main agent to clean oily, waxy, and heavy oily organic dirt, the main organic solvents commonly used are benzene, toluene, xylene, ethylbenzene and other aromatic hydrocarbons, as well as kerosene, diesel oil, etc. Petroleum fractions such as aromatic hydrocarbons or petroleum fractions have the disadvantage of being very harmful to humans, animals and the environment, and the cost is also high

From the perspective of their respective cleaning purposes, the research on the above two types of scale removal rarely takes into account the simultaneous existence of inorganic chemical scale, clay muddy scale and organic scale. In addition, the three major bacteria existing in the cleaning environment are not considered. A kind of inorganic chemical scale (CaCO 3 , Fe 2 o 3 , FeS, etc.), clay muddy scale and organic scale multifunctional cleaning agent is necessary