Cross-linked cationic reverse demulsifier and preparation method thereof

Abstract

The invention provides a cross-linked cationic reverse demulsifier and a preparation method thereof. The preparation method comprises the following steps: stirring and mixing polyether and a potassium hydroxide solution, conducting heating to 56-64 DEG C, and conducting stirring for 0.5-2 hours to obtain a mixed solution A; dropwise adding epichlorohydrin into the mixed solution A for 0.5-1 hour, heating the reaction system to 70-85 DEG C after dropwise adding is completed, and performing stirring reaction for 3-5 hours to obtain a mixed solution B; and adding a potassium hydroxide solution into the mixed solution B, conducting stirring and mixing, conducting heating to 56-64 DEG C, conducting stirring for 0.5-2 hours to obtain a mixed solution C, dropwise adding a 2,3-epoxypropyltrimethylammonium chloride solution into the mixed solution C for 0.5-1 hour, heating the reaction system to 70-85 DEG C after dropwise adding is completed, conducting stirring and reacting for 3-5 hours, cooling the reaction system to 30-50 DEG C, adding an ethanol-water mixed solution again, continuously conducting stirring for 20-40 minutes, and conducting filtering to obtain the cross-linked cationic reverse demulsifier. The water cleaning performance and the water cleaning speed of the reverse demulsifier are improved.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a cross-linked cationic reverse phase demulsifier and a preparation method thereof. Background technique [0002] Due to the wide application of tertiary oil recovery technology, the associative polymer with amphiphilic structure used for oil displacement returns to the ground after a long time of action from the ground to the ground, and has become an amphiphilic polymer with a small relative molecular mass, which can be combined with water It can also interact with oil to make the oil-water emulsion more stable. [0003] Inverted demulsifiers are mainly used for the separation of oil-in-water emulsions in oilfield production fluids. In order to adapt to the demulsification requirements of oil-water production fluids in different oil fields, the inverse demulsifiers are often modified and studied, such as head-changing, tail-changing, bone-adding, chain extension...

AI Technical Summary

Problems solved by technology

[0005] The invention overcomes the deficiencies in the prior art. The existing reverse phase demulsifiers have the problems of single functional group of polyether type reverse phase demulsifiers, poor adaptability, poor water clearing speed and water clearing effect, and provides a cross-linked demulsifier Cationic inverse demulsifier and preparation method thereof, the inverse demulsifier mainly adopts polyether, epichlorohydrin, potassium hydroxide and 2,3-epoxypropyltrimethylammonium chloride as chemical raw materials, and the raw materials are easy to obtain , the production process is simple, and the method has certain originality. The clear water performance of the reverse phase demulsifier is improved by crosslinking nonionic polyether with epichlorohydrin and grafting cations, and the combination of triblock polyether type reverse phase demulsifier guarantees Polymer-containing oilfield production fluid does not precipitate and cationic reverse demulsifier has fast water removal speed and good water removal effect

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