Offshore oil thermal recovery produced water treatment de-emulsifier and preparation method thereof

Abstract

The invention discloses an offshore oil thermal recovery produced water treatment de-emulsifier and a preparation method thereof. The de-emulsifier is represented by a formula I. The preparation method comprises the steps that: (1) methyl acrylate and ethylene diamine are subjected to a Michael addition reaction, such that 0.5-generation polyamide-amine with a structure represented by a formula II is obtained; (2) the 0.5-generation polyamide-amine is subjected to ammonolysis with ethylene diamine, such that 1.0-generation polyamide-amine with a structure represented by a formula III is obtained; (3) under an alkaline condition, 1.0-generation polyamide-amine is adopted as an initial agent, and is subjected to a reaction with propylene oxide, such that a oil-base-end-linked compound is obtained; and (4) the oil-base-end-linked compound adopted as an initial agent, and is subjected to a reaction with ethylene oxide, such that ethylene oxide and propylene oxide bi-block polyether is obtained, and the de-emulsifier is obtained. The offshore oil heavy oil thermal recovery produced sewage de-emulsifier has the advantages of low dose, good treatment effect, and good water solubility. The de-emulsifier can diffuse fast to an oil-water interface and break the interface liquid film. The de-emulsifier has good de-emulsifying performance against emulsion of heavy oil thermal recovery produced sewage. Under low temperature and low dose, a dehydration rate can rapidly reach 75% or higher, such that excellent de-emulsifying performance is shown.

Description

Technical field [0001] The invention relates to a demulsifier for processing water produced by thermal production in offshore oil fields and a preparation method thereof. Background technique [0002] With the continuous deepening of the development of heavy oil in offshore oilfields, the recovery rate of the developed offshore oilfields is gradually decreasing. It is more difficult to produce higher-viscosity heavy oil underground with a single cold recovery technology. Thermal recovery technology is continuously explored and applied in offshore oilfields. With the addition of various chemical agents to improve the thermal recovery effect, chemically assisted thermal recovery technology has also been further developed. Chemically-assisted thermal recovery production fluids generally contain chemical agents such as surfactants and heavy oil viscosity reducers, which enhance the stability of wastewater and increase the difficulty of demulsification of heavy oil thermal recovery wa...

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Problems solved by technology

[0004] Dendritic macromolecule (PAMAM) organic compounds have the characteristics of many branched chains, symmetrical structure, active groups on the branched chains, and regular molecular structure. Synthesize multi-branched block polyethers with high algebraic PAMAM as the initiator Demulsifiers are widely used in oil field production, but the synthesis cost is relatively high; while low-generation PAMAM is used as a starting agent to synthesize multi-branched block polyether demulsifiers, there are few reports, while propylene oxide and ethylene oxide Low algebra multi-branched block polyether demulsifiers with alkane polymerization numbers of 4, 9 and 13 have not been reported, so they have broad application prospects in oil field production, especially in the field of offshore heavy oil sewage treatment

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