A kind of preparation method of oilfield demulsifier

A demulsifier and oil field technology, applied in the direction of dehydration/demulsification by chemical methods, can solve problems such as difficulties, dehydration effect reduction, dehydration cost increase, etc., and achieve the effect of less dosage, clear water quality and ideal effect

Active Publication Date: 2017-03-01
JURONG NINGWU CHEM
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Problems solved by technology

However, the water content in the crude oil produced in many oilfields increases year by year, and various residual chemical agents in the crude oil after sewage reinjection make the demulsification and dehydration of emulsified crude oil more complicated and difficult. The dehydration effect of ordinary polyether demulsifiers is not ideal. Increasing the dosage is still difficult to solve the problem, which leads to the increase of the dehydration cost of the crude oil emulsion and the reduction of the dehydration effect, and also has many adverse effects on the crude oil transportation process and the oil refining in the refinery

Method used

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  • A kind of preparation method of oilfield demulsifier
  • A kind of preparation method of oilfield demulsifier

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example 1

[0014] Firstly, melamine and formaldehyde undergo a condensation reaction, the molar ratio of melamine and formaldehyde is 1:3, react at 85°C for 1 hour, and obtain the trimethylol compound of melamine.

[0015] Then the trimethylol compound of melamine reacts with epichlorohydrin, the molar ratio of the trimethylol compound of melamine and epichlorohydrin is 1: 1, reacts at 60 DEG C for 8 hours, obtains quaternary ammonium salt cationic polymer type broken emulsion.

example 2

[0017] Firstly, melamine and formaldehyde undergo a condensation reaction, the molar ratio of melamine and formaldehyde is 1:3, react at 80°C for 2 hours, and obtain the trimethylol compound of melamine.

[0018] Then the trimethylol compound of melamine reacts with epichlorohydrin, the molar ratio of the trimethylol compound of melamine and epichlorohydrin is 1: 2, and reacts for 6 hours at 70° C. to obtain the quaternary ammonium salt cationic polymer type broken emulsion.

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Abstract

The invention discloses a preparation method of an oil field demulsifier. The preparation method comprises two steps for synthesis of the cationic polymer demulsifier. Firstly, melamine and formaldehyde perform condensation reaction to obtain a trimethyl compound of the formaldehyde, and then epoxy chloropropane is added for reaction so as to obtain the cationic polymer demulsifier. The demulsifier has the ideal effect on demulsification and dehydration of crude oil of an oil field, dehydration water is clear, and the using amount of the demulsifier is small.

Description

technical field [0001] The invention relates to a preparation method of a demulsifier, in particular to a preparation method of a synthetic cationic polymer type oilfield demulsifier. Background technique [0002] Demulsifiers are indispensable chemical additives for all oil fields. At present, polyether demulsifiers are mainly used in China. Most of these demulsifiers use active hydrogen-containing compounds as initiators. Carry out anionic ring-opening polymerization reaction to prepare polyoxyethylene polyoxypropylene ether demulsifier. However, the water content in the crude oil produced in many oilfields increases year by year, and various residual chemical agents in the crude oil after sewage reinjection make the demulsification and dehydration of emulsified crude oil more complicated and difficult. The dehydration effect of ordinary polyether demulsifiers is not ideal. Increasing the dosage is still difficult to solve the problem, which leads to the increase of the d...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C08G65/28C10G33/04
Inventor翟洪金郑磊陈杰倪小明王飞刘峰祥徐华丽
OwnerJURONG NINGWU CHEM