Preparing method of oil field demulsifier

Abstract

The invention discloses a preparing method of an oil field demulsifier. The preparing method adopts ethyleneamine as a raw material, and the oil field demulsifier is prepared by crosslinking modification of the ethyleneamine, ethylene oxide, and propylene epoxide. The method comprises the following steps of: with the ethyleneamine as an initiator, enabling the ethyleneamine to react with propylene oxide and ethylene oxide to prepare an ethyleneamine type polyether demulsifier under the existence of a basic catalyst; carrying out self-crosslinking reaction on the polyether demulsifier A by adopting polycarboxylic acid under the action of a catalyst to prepare a product B; and finally carrying out self-crosslinking reaction on the polyether demulsifier A and the product B in a solvent by adopting toluene diisocynate to prepare a high performance demulsifier as a final product. The demulsifier prepared by the preparing method has the advantages of higher relative molecular weight, favorable dehydration effect and favorable broad spectrum, and can be used for demulsification and dehydration of the crude oil in the oil field. The dehydrated water is clear, and the dosage of the demulsifier is less.

Description

technical field [0001] The invention relates to a preparation method of a demulsifier, in particular to a preparation method of an oilfield demulsifier used for oilfield crude oil collection and transportation dehydration treatment. Background technique [0002] Water is often mixed in the oil extraction process, and the crude oil must be dehydrated before transportation to reduce transportation costs. The free water in crude oil is easy to separate and remove, while the removal of emulsified water in crude oil generally requires the addition of demulsifiers. At present, polyether demulsifiers are mainly used in China. The hydrogen compound is used as an initiator, and under the action of an alkali metal catalyst, it undergoes anionic ring-opening polymerization reaction with an oxyalkylene to prepare a polyoxyethylene polyoxypropylene ether demulsifier. This process has many side reactions when preparing higher molecular weight polyether, the obtained polyether has a relat...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems existing in the existing polyether demulsifiers, the purpose of the present invention is to provide a preparation method of oil field demulsifiers. On the basis of preparing polyethylene polyamine type polyether demulsifiers, the present invention will prepare The polyether demulsifier uses polycarboxylic acid for esterification and cross-linking reaction, and then reacts the obtained product with toluene diisocyanate and polyether demulsifier