High-efficiency and environment-friendly type oxa-perfluoropolyether oil field demulsifier and preparation method

Abstract

The invention provides a high-efficiency and environment-friendly type oxa-perfluoropolyether oil field demulsifier and a preparation method. The demulsifier is prepared from multi-hydroxyl-containing dendritic polyglycerol (A) and a carboxyl modified product (B) of (A) through polymerization with biodegradable hydrophobic and oilphobic oxa-perfluoropolyether (C), wherein (A) is prepared from 1,1,1-trimethylolpropane (TMP) and epoxy isopropyl alcohol through ring opening polymerization; (B) is prepared from (A) through anhydride carboxyl modification; (A) or (B) is subjected to a substitution reaction with (C) at the normal temperature, and the dendritic oxa-perfluoropolyether-containing demulsifier with different hydrophilic and oilphobic properties can be prepared. Compared with an existing oil field demulsifier, the series of the demulsifier has the advantages of low consumption, high dehydration rate, high dehydration speed, clean dehydrated water and the like, overcomes common defects of the existing oil field demulsifier and reduces environmental pollution.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and relates to a high-efficiency and environment-friendly oxa perfluoropolyether oilfield demulsifier suitable for processes such as oilfield production fluid, reinjection water and transfer, and a preparation method thereof. Background technique [0002] At present, most domestic oil fields have entered the stage of tertiary oil recovery, and the water content of the produced fluid is generally 70-90%, while the water content index of commercial oil is: the water content of light and medium crude oil should be lower than 0.5%, while the water content of heavy crude oil is less than 1.0%. [0003] The national oilfield sewage discharge standard is: the oil content of the secondary water is less than 20 mg / L, and the oil content of the primary water is less than 10 mg / L. Usually, sedimentation-coagulation air flotation-filtration and other technologies are used to treat the reinjection water....

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Problems solved by technology

[0006] Related literature points out that the anti-emulsifier with better demulsification effect can be obtained after modifying the polyglycidyl ether with excellent hydrophilic properties by fluorinated reagents, such as: yue zhang (Colloids and Surfaces A: Physicochemical and Engineering Aspects, 436,2013 ) using polyglycidyl ether as raw material and 2-bromo-2-methylpropionyl bromide for atomic free radical transfer under water bath conditions, and then reacting with perfluorobutyl acrylate at 90°C to synthesize fluorine-containing segment and modified Macromolecular polymers, the product can be used in medicine and oil fields, but there are problems such as complex synthesis methods, high requirements for raw materials, and insufficient stability of the product; Difluoro-1,3-dimethylimidazolone (DFI) is a fluorinated reagent that replaces the terminal hydroxyl group of polyglycidyl ether to synthesize an anti-emulsifier, but the method is complicated to operate, the reaction temperature is high, and the product structure is difficult to control. Narrow scope and other problems; Chinese patent CN102210995A introduces a preparation method of fluorine-containing surfactant, but the product obtained by this method is a plurality of perfluorinated long carbon chains, the preparation of fluorine-containing monomer is difficult, the production cost of the product is quite high, and all The long carbon chain of fluorine is not easy to degrade and cannot meet the requirements of environmental protection, so it cannot be promoted

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