Multiple combination oil soluble demulsifier

Abstract

The invention relates to a multiple combination oil soluble demulsifier which comprises 36-50 percent of demulsifier, 5-10 percent of surfactant containing fluorin and 40-59 percent of solvent, wherein the demulsifier comprises modified polyether taking phenolic resin as an initiator and modified polyether taking higher aliphatic alcohol as an initiator, and the weight ratio of the modified polyether taking the phenolic resin as the initiator to the modified polyether taking the higher aliphatic alcohol as the initiator is 0.8-3. The surfactant containing fluorin is preferably sodium perfluorous nonenyloxybenzenesulfonyl, perfluorous ethyldiethanolamine sodium phosphate or N-ethyl Perfluorooctanesulfonamide. The invention is mainly applied to atmospheric and vacuum process of a refinery with the operation temperature of 70-150 DEG C. When the use level is 3-30 ppm, the demulsifier has the advantages of good demulsifying effect, clear water and emulsion layers of demulsifying, high dehydration speed, low water content in purified oil, low oil content of water of dehydration, good broad spectrum activity and low cost.

Description

technical field [0001] The invention relates to a multi-component compound oil-soluble demulsifier, in particular to a high-efficiency demulsifier for electric desalination in oil fields and refineries. Background technique [0002] With the use of tertiary oil recovery technology, heavy oil recovery technology and offshore oil recovery technology, especially the extensive use of surfactants, polymers, and alkali flooding methods in tertiary oil recovery, the serious oil-water emulsification of oil well production fluid has caused the oil-water The difficulty of separation increases, and conventional demulsifiers are not ideal for the dehydration of this produced fluid, such as the dehydration rate decreases and the oil content of the produced water is high. At present, water-soluble demulsifiers are widely used in China. During the desalination and dehydration process of crude oil in oil fields and refineries, most of water-soluble demulsifiers are discharged with water bod...

AI Technical Summary

Problems solved by technology

[0002] With the use of tertiary oil recovery technology, heavy oil recovery technology and offshore oil recovery technology, especially the extensive use of surfactants, polymers, and alkali flooding methods in tertiary oil recovery, the serious oil-water emulsification of oil well production fluid has caused the oil-water Separation is more difficult, and conventional demulsifiers are not ideal for dehydration of this produced fluid, such as a decrease in dehydration rate and high oil content in the produced water

At present, water-soluble demulsifiers are widely used in China. During the desalination and dehydration process of crude oil in oil fields and refineries, most of water-soluble demulsifiers are discharged with water bodies, which not only cause great harm to the environment, but also cause serious waste.

Most of the oil-soluble demulsifiers currently used in China are single-type oil-soluble demulsifiers compounded with organic solvents, and multi-component compounds are rarely used

Due to the diversity of crude oil varieties and types, the complexity of crude oil emulsion determines that the dehydration and desalination indicators of the demulsifier during the application process are not very ideal, and there is no strong broad-spectrum

[0003] CN1831092 has introduced a kind of fluorine-containing silicon cross-linked polyether demulsifier and its preparation method. The demulsifier is composed of a fluorine-containing silicon hydroxyl compound and an active hydrogen or active hydroxyl-containing alcohol, acid, phenol, amine or Phenolic resin is polymerized with ethylene oxide and propylene oxide to form a block polyether, in the crosslinking agent toluene diisocyanate (TDI) or polyalkylene polyisocyanate (PAPI) or diphenylmethane-4,4'-di It is polymerized under the action of isocyanate (MDI), and the hydroxyl compound containing fluorine silicon is used as the crosslinked raw material, which has high cost and poor broad spectrum

[0004] CN1396238 discloses a broad-spectrum crude oil demulsifier, which is compounded from polyol oxypropylene oxide polymer, polyamine oxide ethylene oxide propylene polymer, freezing point depressant and solvent. Although it can be applied to various crude oils, Strong broad-spectrum, but the dehydration effect is not ideal, generally the water content of purified oil is between 0.1% and 0.3%.

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