Preparation method of oil-soluble aquathermolysis catalytic viscosity reducer for thickened oil

Abstract

The invention relates to a preparation method of an oil-soluble aquathermolysis catalytic viscosity reducer for thickened oil. The preparation method is characterized by comprising the following steps: 1) selecting the following raw materials in proper proportions: 3-5g of gallic acid, 5-10mL of halogenated hydrocarbon, 10-100mL of an organic solvent, 8-15g of anhydrous carbonate, 80-100mL of 2-5mol / L aqueous alkali, 100mL of absolute methanol and 3-7g of nickel salt; 2) adding gallic acid, halogenated hydrocarbon and anhydrous carbonate to a round-bottom flask respectively, next, adding the organic solvent, introducing nitrogen and performing heating and stirring reflux at a temperature of 50-70 DEG C for 12-24 hours, filtering the obtained product, and performing reduced-pressure rotary evaporation to obtain a transparent oily liquid, next, dissolving the product in the absolute methanol, adding the aqueous alkali, and hydrolyzing the product by virtue of reflux at a temperature in the range of 30-50 DEG C for 3 hours, performing reduced-pressure rotary evaporation to separate out the methanol, slowly and dropwise adding diluted hydrochloric acid to the solution until the pH value is in the range of 7-8, next, slowly and dropwise adding a nickel salt solution, stirring for reacting thoroughly, and then filtering and drying to obtain bluish powder, namely the oil-soluble aquathermolysis catalytic viscosity reducer.

Description

technical field [0001] The invention relates to a preparation method of an oil-soluble heavy oil hydrothermal cracking catalytic viscosity reducer, which belongs to the field of petroleum exploitation chemistry. Background technique [0002] With the continuous increase of heavy oil production, the high viscosity and high content of colloidal asphaltenes of heavy oil have brought great difficulties to its storage and transportation. Therefore, the rationality, advancement and economy of heavy oil transportation technology directly affect the comprehensive technical indicators of crude oil production. Some traditional viscosity reduction methods, such as heating, emulsification, and thinning, have failed to fundamentally change the content and relative molecular weight of colloidal asphaltene macromolecules in heavy oil. When the conditions disappear, the heavy oil will return to its original high-viscosity state. Although some viscosity reduction technologies have been app...

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Problems solved by technology

[0005] Many literatures at home and abroad have mentioned that the hydrothermal cracking reaction adopts a temperature of 240°C or higher, but due to the heat loss during the steam injection process and the heterogeneity of the formation, the oil layer usually cannot reach such a temperature

In addition, the oil solubility of the usual catalyst is not good, so that the catalyst cannot be fully contacted with crude oil, which affects the catalytic efficiency and cannot achieve a good viscosity reduction effect, especially under alkaline conditions, the transition metal ion as a catalyst is easy to precipitate