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Polymer flooding crude oil demulsifier and preparation method and application thereof

A technology of crude oil demulsifier and polymer, which is applied in the direction of chemical dehydration/demulsification, etc. It can solve the problems of inability to meet the requirements of external transportation, difficult separation of oil and water, and serious emulsification of crude oil, so as to reduce the pressure of sewage treatment and efficiently demulsify Milk, the effect of increasing the molecular weight

Active Publication Date: 2014-07-02
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polymer flooding also brings problems to subsequent oil, gas and water treatment
Due to the presence of polymers, the viscosity of the polymer-containing production fluid increases greatly, and the crude oil is seriously emulsified. It is difficult to separate oil and water by natural sedimentation alone.
After the production fluid of polymer flooding is treated with a conventional demulsifier, the separated crude oil has a high water content, and even if the dosage of the chemical is increased, it still cannot meet the requirements for external transportation

Method used

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  • Polymer flooding crude oil demulsifier and preparation method and application thereof
  • Polymer flooding crude oil demulsifier and preparation method and application thereof
  • Polymer flooding crude oil demulsifier and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The synthesis of embodiment 1, demulsifier DP-1

[0064] (1) Synthesis of α,α-bis(4-aminophenyl)-1-(3',5'-dimethyl-4'-sulfophenyl)methane

[0065] 1) Synthesis of aromatic diamines

[0066] Add 37.20g (0.40mol) of aniline and 70mL of distilled water to a three-necked flask equipped with mechanical stirring, a condenser, and a nitrogen port, and stir thoroughly under nitrogen protection. Slowly add 50.00mL concentrated hydrochloric acid (mass fraction 37%) dropwise, keep the system temperature at 40°C, then add 29.52g (0.22mol) 3,5-dimethylbenzaldehyde in batches. After the system was vigorously stirred under reflux for 12 hours, the temperature of the reaction system was lowered to 50° C., and 34.60 g of anhydrous potassium carbonate powder was added in batches under stirring until the system no longer produced bubbles. The solution was subjected to steam distillation, and a solid powder was obtained after suction filtration. Rinse the solid powder with hot water, re...

Embodiment 2

[0077] The synthesis of embodiment 2, demulsifier DP-2

[0078] (1) Synthesis of α,α-bis(4-amino-3,5-diethylphenyl)-1-(4'-methoxy-5'-sulfophenyl)methane

[0079] 1) Synthesis of aromatic diamines

[0080] Add 59.68g (0.40mol) of 2,6-diethylaniline and 120.00mL of distilled water to a three-necked flask equipped with mechanical stirring, a condenser, and a nitrogen port, and stir thoroughly under nitrogen protection. 61.50 mL of sulfuric acid solution (35% by mass) was slowly added dropwise, and the system temperature was maintained at 30°C, and then 28.56 g (0.21 mol) of 4-methoxybenzaldehyde was added in batches. After the system was vigorously stirred under reflux for 6 hours, the temperature of the reaction system was lowered to 50° C., and 36.90 g of sodium bicarbonate powder was added in batches under stirring until the system no longer produced bubbles. The solution was subjected to steam distillation, and a solid powder was obtained after suction filtration. Rinse th...

Embodiment 3

[0091] Embodiment 3, the synthesis of demulsifier DP-3

[0092] (1) α,α-bis(4-amino-3,5-dimethoxyphenyl)-1-(3',5'-dimethyl-4'-sulfophenyl)methane

[0093] 1) Synthesis of aromatic diamines

[0094] Add 61.28g (0.40mol) of 2,6-dimethoxyaniline and 135.00mL of distilled water to a three-necked flask equipped with mechanical stirring, a condenser, and a nitrogen port, and stir thoroughly under nitrogen protection. Slowly add 40.50 mL of concentrated hydrochloric acid (mass fraction 37%) dropwise, and maintain the system temperature at 35°C, then add 28.14 g (0.21 mol) of 3,5-dimethylbenzaldehyde in batches. After the system was vigorously stirred under reflux for 6 hours, the temperature of the reaction system was lowered to 50° C., and 16.40 g of sodium hydroxide powder was added in batches under stirring. The solution was subjected to steam distillation, and a solid powder was obtained after suction filtration. Rinse the solid powder with hot water, recrystallize with dioxan...

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Abstract

The invention discloses a polymer flooding crude oil demulsifier and a preparation method and application thereof. The preparation method of the polymer flooding crude oil demulsifier provided by the invention comprises the following steps: (1) adding a mixture of sulfonated aromatic diamine shown in a formula I and ethanediamine into a product obtained by reaction between sulfonated aromatic diamine shown as the formula I with methyl acrylate to have a reaction to obtain 1.0-generation polyamidoamine-amine; repeating the two reactions twice to obtain amino-terminated 3.0-generation polyamidoamine-amine; (2) performing block copolymerization on the amino-terminated 3.0-generation polyamidoamine-amine with epoxypropane and ethylene oxide in sequence in the presence of an alkaline catalyst to obtain a polyamidoamine-amine-polyether compound; and (3) performing a crosslinking reaction on the polyamidoamine-amine-polyether compound and mannitol polyether in the presence of a crosslinking agent and a solvent to obtain the polymer flooding crude oil demulsifier. By adopting the demulsifier, the demulsifying effect of polymer-containing crude oil can be improved remarkably, and the subsequent sewage treatment stress is relieved effectively, so that the demulsifier has a wide application prospect on the aspect of crude oil dehydration treatment of polymer flooding produced liquid.

Description

technical field [0001] The invention relates to a polymer flooding crude oil demulsifier, a preparation method and application thereof. Background technique [0002] As an important chemical flooding method, polymer flooding has achieved remarkable results in enhanced oil recovery in land and offshore oil fields, and has become one of the most important means of increasing oil production and controlling water in oil fields. Polymer flooding uses polymer aqueous solution as the displacement phase. By improving the mobility ratio of the displacement phase and the displaced phase, reducing the fingering of the displacement phase and increasing the sweep coefficient, the purpose of enhancing oil recovery is achieved. However, polymer flooding also brings problems to subsequent oil, gas and water treatment. Due to the existence of polymers, the viscosity of the polymer-containing production fluid increases greatly, and the crude oil emulsifies seriously, so it is difficult to se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08G83/00C08G65/333C08G65/28C10G33/04
Inventor 翟磊张健靖波檀国荣
Owner CHINA NAT OFFSHORE OIL CORP
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