Modified polyether, composite crude oil demulsifier, and preparation method and application of composite crude oil demulsifier

A crude oil demulsifier and polyether technology, applied in the field of composite crude oil demulsifier and modified polyether, can solve the problems of lower dehydration temperature, high thermal energy consumption, and increased viscosity of emulsified crude oil.

Pending Publication Date: 2020-10-30
ANTON OILFIELD SERVICES (GRP) LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Now the oil field mining has entered a period of high water cut, coupled with the application of various enhanced oil recovery technical measures, resulting in a sharp increase in the water content of the crude oil emulsion, making it more difficult to dehydrate the crude oil
Due to the strong mixing of crude oil and water to form emulsified crude oil with different stability, the dehydration of crude oil is more difficult, and the existing demulsifiers are far from meeting the needs of demulsification and dehydration of high water content crude oil, heavy oil, and high waxy crude oil; the main reason is Yes: The dehydration temperature of crude oil is lowered, the wax in the crude oil is precipitated, the viscosity of the emulsified crude oil is increased, and the emulsified crude oil is often in a water-in-oil state, the demulsifier molecules are difficult to disperse in the crude oil, and cannot quickly act on the oil-water interface film
[0003] At present, the demulsifier used in Iraq's Lukoil West Qurna Phase II Oilfield has poor adaptability, increased wellhead back pressure, unstable and reduced daily liquid production, slow dehydration rate of crude oil, and high heat energy consumption

Method used

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  • Modified polyether, composite crude oil demulsifier, and preparation method and application of composite crude oil demulsifier
  • Modified polyether, composite crude oil demulsifier, and preparation method and application of composite crude oil demulsifier
  • Modified polyether, composite crude oil demulsifier, and preparation method and application of composite crude oil demulsifier

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preparation example Construction

[0043] The invention provides a kind of preparation method of modified polyether, comprises the following steps:

[0044] a Preheat the phenolic compound and vinylamine compound under normal pressure at 50-70°C for 30-50min; 2 Or raise the temperature to 110-130°C within 30min-60min under an inert atmosphere, then add formaldehyde solution dropwise, raise the pressure to 0.2-0.6MPa, and react at a constant temperature of 110-130°C for 2-5 hours to obtain the first intermediate product;

[0045] b Add alkali to the first intermediate product, add an aqueous solution of epoxy alkyl compound dropwise at 0.2-0.6MPa, 110-130°C, react at constant temperature and pressure for 5-7 hours, then cool to 70-90°C to obtain the first two intermediate products;

[0046] c. The second intermediate product is decompressed to normal pressure, cooled to room temperature, and after neutralization and purification, the modified polyether is obtained;

[0047] The cloud point of the modified poly...

Embodiment 1

[0074] Weigh p-cresol and diethylenetriamine respectively according to the mass ratio of 4:1, add up to 100g, pour them into a sealed 1L 304 stainless steel reaction tank, preheat at 60°C for 30min under normal pressure; use N2 or inert The gas replaces the air in the tank, and the replacement time is 30 minutes; then the stirring is started, the stirring rate is kept at 200 rpm / min, and the temperature is raised to 130° C. within 30 minutes. Then slowly drop 5g of formaldehyde solution with a concentration of 30wt%, and control the rate of dropping to 30 drops / min, the pressure in the tank rose to 0.4MPa, the reaction temperature was 130°C, and the reaction was performed at a constant temperature for 2 hours. Add the solid sodium hydroxide of 1.65g then, tank internal pressure remains on 0.4MPa, and temperature is constant at 130 ℃, dripping 10g concentration is the ethylene oxide aqueous solution of 99wt% and 10g concentration is the propylene oxide aqueous solution of 99wt%,...

Embodiment 2

[0097] Weigh phenol and diethylenetriamine respectively according to the mass ratio of 4:1, the total of the two is 50g, pour it into a sealed 1L 304 stainless steel reaction tank, preheat at 50°C for 30min under normal pressure; use N2 or inert gas to replace the tank Inner air, the replacement time is 30min; then start stirring, the stirring rate is kept at 200rpm / min, and the temperature is raised to 125°C within 30min. Then slowly drip 5g of formaldehyde solution with a concentration of 30wt%, control the rate of addition at 30 drops / min, the pressure in the tank rises to 0.4MPa, the reaction temperature is 125°C, and the reaction is performed at a constant temperature for 4 hours. Add the solid sodium hydroxide of 2g then, tank inner pressure remains on 0.4MPa, and temperature is constant at 125 ℃, drips 20g concentration and is the aqueous solution of ethylene oxide of 99wt%, the rate of addition of aqueous solution of control ethylene oxide is 20 drop / min, after 3 hours...

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Abstract

The invention relates to modified polyether, a composite crude oil demulsifier, and a preparation method and application of the composite crude oil demulsifier. The preparation method of the modifiedpolyether comprises the following steps: sealing and preheating phenols and vinylamine at 50-70 DEG C under normal pressure for 30-50 minutes, heating to 110-130 DEG C within 30-60 minutes in an N2 orinert atmosphere at a stirring speed, dropwise adding a formaldehyde aqueous solution, heating to 0.2-0.6 MPa, reacting for 2-5 hours at a constant temperature of 110-130 DEG C, adding alkali into the first intermediate product under the condition of keeping the previous stirring rotation speed, dropwise adding an epoxy alkyl compound aqueous solution under the conditions of 0.2-0.6 MPa and 110-130 DEG C, carrying out constant-temperature and constant-pressure stirring reaction for 5-7 hours, cooling to 70-90 DEG C, reducing the pressure to normal pressure, cooling to room temperature, and neutralizing and purifying to obtain the modified polyether. According to the composite crude oil demulsifier provided by the invention, the used raw materials are wide in source and low in cost, and subsequent oil refining equipment is not corroded, so that the cost can be saved, and the utilization rate of the equipment is improved.

Description

technical field [0001] The invention belongs to the field of oilfield chemical additives, and in particular relates to a modified polyether, a composite crude oil demulsifier, a preparation method and application thereof. Background technique [0002] Crude oil is a very complex multi-component mixture, mainly composed of hydrocarbons with different molecular weights, structures and properties, as well as non-hydrocarbon compounds and impurities. Now the oilfield mining has entered a period of high water cut, coupled with the application of various enhanced oil recovery technical measures, resulting in a sharp increase in the water content of crude oil emulsion, making it more difficult to dehydrate crude oil. Due to the strong mixing of crude oil and water to form emulsified crude oil with different stability, the dehydration of crude oil is more difficult, and the existing demulsifiers are far from meeting the needs of demulsification and dehydration of high water content ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/26C10G33/04
CPCC08G65/2624C08G65/2612C08J3/03C10G33/04
Inventor 饶志刚倪志国安进谢刚儒王凯建邓磊李鹏
Owner ANTON OILFIELD SERVICES (GRP) LTD
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