Preparation method of oilfield demulsifier by utilizing waste grease

Abstract

The invention discloses a preparation method of an oilfield demulsifier by utilizing waste grease, which comprises the following steps that: the waste grease is used as a raw material, and is reacted with ethylene diamine after being modified, an andepoxide is introduced in the presence of catalyst to obtain a polyether demulsifier; polycarboxylic acid is reacted with the polyether demulsifier byself-crosslinking; and finally, the resultant product and polymerized aluminum chloride are compounded to obtain the novel demulsifier. Compared with the preparation method of the ordinary polyether demulsifier, the preparation method of the demulsifier has lower epoxide consumption, lower cost, and changes the waste grease into valuables. The prepared demulsifier has ideal demulsification and dehydration effects for crude oil from an oilfield, and the dehydrated water is clear and less.

Description

technical field [0001] The invention relates to a preparation method of a demulsifier, in particular to a method for preparing an oil field demulsifier by using waste oil. 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 dehydration c...