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Preparation method for nano copolymer crude oil demulsifier

A technology of crude oil demulsifier and copolymer, which is applied in the field of preparation of nano-copolymer crude oil demulsifier, which can solve the problem of demulsification efficiency with small molecular weight of branched demulsifier, difficulty in controlling the particle size of nanoparticles, and changing the properties of oil-water interface film problems such as good demulsification ability, low cost and strong surface/interface activity

Active Publication Date: 2018-12-28
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the branched demulsifiers prepared by these two methods have the advantages of high molecular weight, small dosage and high demulsification efficiency, there are still many problems such as complicated process.
In recent years, the application of nanoparticles in the field of oil and gas field technology has begun to attract attention. Nanoparticles are applied to the oil-water separation of crude oil emulsion. Greatly improve the demulsification efficiency, but the particle size of nanoparticles is difficult to control, and the preparation process is cumbersome

Method used

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Effect test

preparation example Construction

[0014] The present embodiment provides a kind of preparation method of nanometer copolymer crude oil demulsifier, comprises the steps:

[0015] (1) Dissolve 0.1-0.5 parts of polyvinyl alcohol and 0.2-1 part of compound emulsifier in deionized water, stir and mix evenly to obtain the water phase;

[0016] (2) Stir and mix 2.5-7.07 parts of hydrophilic monomers, 3-7.6 parts of hydrophobic monomers and 0.01-0.1 parts of cross-linking agent to obtain an oil phase;

[0017] (3) Add the water phase to the high-speed homogenizer, turn on the high-speed homogenizer, and adjust the homogenization speed to 20000-23000r / min. Slowly add the oil phase to the water phase at a speed of 40d / s, and disperse homogeneously at a high speed while adding. ;

[0018] (4) Add 0.05-0.1 part of initiator to the emulsion, stir and mix evenly, then raise the temperature of the mixture to 50-90°C, and react for 2-8 hours to obtain a nano-copolymer crude oil demulsifier.

[0019] The compound emulsifier...

Embodiment 1

[0026] (1) 0.5g of polyvinyl alcohol, 0.5g of cetyl alcohol and 0.5g of sodium lauryl sulfate were dissolved in 100ml of deionized water, stirred and mixed evenly to obtain an aqueous phase;

[0027] (2) Stir and mix 3.09g of acrylic acid, 1.37g of styrene, 5.54g of methyl methacrylate and 0.1g of N,N'-methylenebisacrylamide to obtain an oil phase;

[0028] (3) Add the water phase to the high-speed homogenizer, turn on the high-speed homogenizer, adjust the homogenization speed to 20000r / min, and then slowly drop the oil phase into the high-speed homogenizer at a speed of 20d / s , after the addition, keep the homogenization speed unchanged and continue the homogeneous dispersion for 25 minutes, turn off the high-speed homogenizer to obtain a microsuspension emulsion;

[0029] (4) Add 0.05 g of azobisisobutyronitrile to the microsuspension emulsion, stir and mix evenly, then raise the temperature of the mixture to 80° C., and react for 3 hours to obtain a nano-copolymer crude oi...

Embodiment 2

[0033] (1) 0.5g of polyvinyl alcohol, 0.2g of cetyl alcohol and 0.5g of alkylphenol ether sulfosuccinate sodium salt were dissolved in 100ml of deionized water, stirred and mixed evenly to obtain an aqueous phase;

[0034] (2) Stir and mix 2.5g of acrylic acid, 3.96g of methyl methacrylate, 3.64g of glycidyl methacrylate and 0.05g of divinylbenzene to obtain an oil phase;

[0035] (3) Add the water phase to the high-speed homogenizer, turn on the high-speed homogenizer, adjust the homogenization speed to 21000r / min, and then slowly drop the oil phase into the high-speed homogenizer at a speed of 22d / s , after the addition, keep the homogenization speed unchanged and continue the homogeneous dispersion for 30 minutes, turn off the high-speed homogenizer to obtain a microsuspension emulsion;

[0036] (4) Add 0.1 g of benzoyl peroxide to the microsuspension emulsion, stir and mix evenly, then raise the temperature of the mixture to 90° C., and react for 2 hours to obtain a nano-cop...

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Abstract

The invention discloses a preparation method for a nano copolymer crude oil demulsifier. The preparation method comprises the following steps: (1) dissolving 0.1-0.5 part of polyvinyl alcohol and 0.2-1 part of compound emulsifier in water, and evenly mixing to obtain an aqueous phase; evenly mixing 2.5-7.07 parts of hydrophilic monomer, 3-7.6 parts of hydrophobic monomer, and 0.01-0.1 part of crosslinking agent to obtain an oil phase; (2) slowly adding dropwise the oil phase to the aqueous phase at a normal temperature, performing homogeneity at a high speed while adding the oil phase, homogenizing the mixed liquid at a high speed for 25-35 minutes after the adding to obtain a microsuspension; (3) adding 0.05-0.1 part of initiator to the microsuspension, and after uniform mixing, heating the mixed liquid to 50-90 DEG C, reacting for 2-8 h, and obtaining the finished product. According to the preparation method, the microsuspension with a controllable nano size is prepared first, and then the initiator is added to perform the polymerization reaction. Compared with a conventional method, the preparation method is simple to operate, reaction conditions are mild, and the particle sizeof the obtained product is controllable.

Description

technical field [0001] The invention relates to the technical field of oilfield chemicals, in particular to a preparation method of a nanometer copolymer crude oil demulsifier. Background technique [0002] Most of the oil production in our country adopts the water flooding production method, and the produced crude oil contains a large amount of water, so that the produced fluid mostly exists in the form of emulsion. Crude oil emulsion increases the viscosity of crude oil, which will increase the load on pumps, pipelines and storage tanks, and easily cause catalyst poisoning. Therefore, it is necessary to demulsify crude oil production fluid. Natural surfactants in crude oil play a major role in the stability of emulsions, such as colloids, asphaltenes, naphthenic acids, fatty acids, microcrystalline paraffin, clay particles, etc. are adsorbed on the oil-water interface to form a firm viscoelastic interfacial film , causing kinetic barriers to the aggregation of crude oil d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04
CPCC10G33/04
Inventor 罗跃黄志明米远祝叶泛原堃匡家哲江夏
Owner YANGTZE UNIVERSITY
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