Nonionic-cationic copolymer containing polyether branched chain and preparation method thereof

A cationic copolymer, non-ionic technology, applied in separation methods, chemical dehydration/demulsification, liquid separation, etc., can solve the problems of sludge clogging water treatment facilities, short residence time, slow dispersion rate, etc. Good, fast dehydration rate, less use effect

Active Publication Date: 2021-02-02
中海油(天津)油田化工有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for oilfields with high water content of produced fluid, short residence time, and small oil-water density difference, there are still great difficulties in the treatment of produced fluid: conventional inverse demulsifiers are either slow in dispersion rate so that the effect is not obvious, or they are easy to demulsify. Sludge generation clogs downstream water treatment facilities (e.g. hydrocyclones)

Method used

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  • Nonionic-cationic copolymer containing polyether branched chain and preparation method thereof
  • Nonionic-cationic copolymer containing polyether branched chain and preparation method thereof
  • Nonionic-cationic copolymer containing polyether branched chain and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 15.0g of maleic anhydride and 100.0g of polyether AE121 obtained by polyaddition reaction of organic amine compounds with propylene oxide and ethylene oxide into a three-necked flask equipped with stirring, reflux and condensing devices, and slowly heat to 60°C , start stirring, continue heating to 90°C for 2 hours, then add 25.0g of 60% diallyldimethylammonium chloride aqueous solution and 380.0g of deionized water, control the temperature between 75°C and 80°C, drop Add a solution of 0.9g ammonium persulfate dissolved in 10.0g deionized water to initiate polymerization; after adding the initiator dropwise, raise the temperature to 80°C-85°C and continue the reaction for 3.5h to obtain a viscous liquid with a solid content of about 25%. (AE121MC1).

Embodiment 2

[0021] Add 5.0g of maleic anhydride and 100.0g of polyether SP169 obtained by polyaddition reaction of stearyl alcohol with propylene oxide and ethylene oxide into a three-necked flask equipped with stirring, reflux and condensing devices, and slowly heat to 60°C , start stirring, continue heating to 90°C for 2 hours, then add 6.25g of 80% acryloyloxyethyltrimethylammonium chloride aqueous solution and 293.75g of deionized water, and control the temperature between 75°C and 80°C. Add dropwise a solution of 0.015g of sodium persulfate dissolved in 5.0g of deionized water to initiate polymerization; after adding the initiator, raise the temperature to 80°C to 85°C and continue the reaction for 3.5h to obtain a viscous liquid with a solid content of about 27%. (SP169MC1).

Embodiment 3

[0023] In the 7-square enamel reaction kettle, add 1000Kg of polyether SP169 obtained by the polyaddition reaction of octadecyl alcohol, propylene oxide and ethylene oxide, start heating, start stirring when the temperature rises to 60°C, and add 80Kg maleic anhydride, continue to heat to 90°C and keep it warm for 4 hours, then add 200Kg concentration of 60% diallyldimethylammonium chloride aqueous solution and 3300Kg deionized water, control the temperature between 75°C and 80°C, Add dropwise a solution of 0.4Kg ammonium persulfate dissolved in 10Kg deionized water to initiate polymerization; after adding the initiator, raise the temperature to 80°C to 85°C and continue the reaction for 5 hours to obtain a viscous liquid with a solid content of about 26% (SP169MC2 ).

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Abstract

The invention discloses a nonionic-cationic copolymer containing a polyether branched chain and a preparation method thereof. The preparation method comprises the following steps of: adding maleic anhydride and polyether polyol into a container according to a certain sequence, carrying out a reaction at a certain temperature, adding a water-soluble cationic monomer, water and an initiator according to a certain ratio, and carrying out a polymerization reaction under a certain condition to obtain non-ionic cationic copolymer containing a polyether branched chain. The nonionic-cationic amphoteric copolymer disclosed by the invention can be used as a reverse demulsifier for oil-water separation of oilfield produced liquid, has demulsification and flocculation functions, and has the advantagesof high separation rate and good dehydrated water quality for high-water-content or ultrahigh-water-content crude oil emulsion.

Description

technical field [0001] The invention belongs to the technical field of petroleum processing, and relates to a reverse-phase demulsifier for oil-water separation of high water-content crude oil production liquid and a preparation method thereof, in particular to a nonionic-cationic copolymer type high water-content crude oil production liquid containing polyether branched chains Use inverse demulsifier and preparation method. Background technique [0002] At present, most oilfields in my country have entered the middle and late stage of development and production, the trend of heavy crude oil is prominent, the water content of the produced fluid increases sharply, and the proportion of oil-in-water (O / W) emulsion is increasing, O The degree of emulsification of / W emulsion is more serious, the material composition in the oil-water interface is more complex, and the difficulty of oil-water separation is further increased. The traditional treatment strategy of demulsifier + wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F226/02C08F220/34C10G33/04C02F1/40C02F103/10
CPCC08F283/065C10G33/04C02F1/40C02F2103/10C08F226/02C08F220/34
Inventor 魏强李军王永军杜大委代红成郭海军
Owner 中海油(天津)油田化工有限公司
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