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Reverse demulsifier for treating crude oil produced water and preparation method thereof

An inverse demulsifier and produced water technology, applied in separation methods, mining wastewater treatment, grease/oily substance/float removal devices, etc., can solve problems such as reducing oil yield, environmental pollution, waste of oil, etc. The effect of reducing treatment cost, improving purification effect, and reducing dosage

Active Publication Date: 2021-01-22
山东东方盛嘉石油科技有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even simply discharge directly, which not only causes environmental pollution, but also wastes part of the oil, reducing the oil yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The inverse demulsifier is prepared via the following steps:

[0035] (1) adding polyaluminum sulfate to 7 times the mass of water for dilution to obtain a polyaluminum sulfate prepolymer with a mass concentration of about 12.50%;

[0036] (2) Dilute the alkyl glucoside into water, the mass ratio of the alkyl glucoside to water is 1:1 to obtain the alkyl glucoside solution; stir and mix the alkyl glycoside solution, then slowly raise the temperature to 30°C and keep it warm for 60 minutes Afterwards, the temperature was raised to 90°C, kept for 1.5 hours, and then cooled by itself to obtain an alkyl glycoside prepolymer;

[0037] (3) Weigh the polyaluminum sulfate prepolymer prepared in step (1), the alkyl glycoside prepolymer prepared in step (2), and the polyoxyethylene polyoxypropylene embedded polyoxyethylene polyoxypropylene with a mass concentration of 50%. Segment copolymer solution, the mass ratio of polyaluminum sulfate prepolymer, alkyl glycoside prepolymer a...

Embodiment 2

[0040] The inverse demulsifier is prepared via the following steps:

[0041] (1) adding polyaluminum chloride to 6 times the mass of water for dilution to obtain a polyaluminum chloride prepolymer with a mass concentration of about 14.29%;

[0042] (2) Dilute the alkyl glucoside into water, the mass ratio of the alkyl glucoside to water is 1:1.3 to obtain the alkyl glycoside solution; stir and mix the alkyl glycoside solution, then slowly raise the temperature to 50°C and keep it warm for 50 minutes After that, the temperature was raised to 94°C, and after 1.1 hours of heat preservation, it was then cooled by itself to obtain an alkyl glycoside prepolymer;

[0043] (3) Weigh the polyaluminum chloride prepolymer prepared in step (1), the alkyl glycoside prepolymer prepared in step (2), and the higher fatty alcohol polyoxyethylene with a mass concentration of 70% Ether solution, the mass ratio of polyaluminum chloride prepolymer, alkyl glycoside prepolymer and higher fatty alco...

Embodiment 3

[0046] The inverse demulsifier is prepared via the following steps:

[0047] (1) adding polyferric sulfate to 8 times the mass parts of water for dilution to obtain a polyferric sulfate prepolymer with a mass concentration of about 11.11%;

[0048] (2) Dilute the alkyl glucoside into water, the mass ratio of alkyl glucoside to water is 1:1.8 to obtain the alkyl glycoside solution; stir and mix the alkyl glycoside solution, then slowly raise the temperature to 70°C, and keep it warm for 40 minutes Afterwards, the temperature was raised to 92°C, kept for 1.4 hours, and then cooled by itself to obtain an alkyl glycoside prepolymer;

[0049](3) Weigh the polymerized ferric sulfate prepolymer prepared in step (1), the alkyl glycoside prepolymer prepared in step (2), and the higher fatty alcohol polyoxyethylene ether with a mass concentration of 80% Solution, the mass ratio of polyferric sulfate prepolymer, alkyl glycoside prepolymer and higher fatty alcohol polyoxyethylene ether s...

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PUM

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Abstract

The invention discloses a reverse demulsifier for treating crude oil produced water and a preparation method thereof, which belong to the technical field of wastewater treatment. The reverse demulsifier comprises the following components in percentage by mass: 4.63-7.25% of polymerized high-valence metal salt, 14.63-26.67% of nonionic polyether, 8.69-10.98% of alkyl glycoside and the balance of water. According to the reverse demulsifier, alkyl glycoside and nonionic polyether can generate a surfactant of which the type is opposite to that of emulsion formed by an emulsifier, so that the emulsifier is subjected to phase transformation and loses the emulsifying property, the interfacial tension of water-in-oil or oil-in-water emulsion is improved, colloidal particles in sewage lose stable repulsive force and attraction force, finally, the stability is lost to form flocs; and high-valence metal cations in the polymerized high-valence metal salt can play a role in compressing the double electric layers, so that the oil droplets are close to be neutral, the stability of the oil droplets is reduced to form flocs, and demulsification is realized together.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to an inverse demulsifier for treating crude oil produced water and a preparation method thereof. Background technique [0002] In order to increase crude oil production, polymers, surfactants and plugging agents are usually added during the oil recovery process. And with the increase of oil field production time, the water content in the crude oil production fluid is increasing year by year, and dehydration treatment is required to form crude oil production water. During the dehydration process, in order to achieve the predetermined dehydration index, demulsifiers, bactericides and corrosion inhibitors are added accordingly. This has led to a large amount of chemical agents in the crude oil production water, and these chemical agents are generally stable organic polymer substances, which makes the produced water form a relatively stable emulsion and increa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/40
CPCC02F1/40C02F2103/10
Inventor 刘建芳赵玲玲赵世超孙红郑同河王亲国阚新峰滑东付宝兵刘堂辉杨礼杨注学刘涛史源清
Owner 山东东方盛嘉石油科技有限责任公司
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