Preparation method and application of multifunctional polyamine amide for oil field

Abstract

The invention relates to a preparation method of multifunctional polyamine amide for an oil field. The preparation method comprises the steps of: firstly dissolving long-chain fatty acyl polyamine prepared from long-chain fatty acid and polyethylene polyamine in an organic solvent in a container, adding a cross-linking agent to the container under stirring, stirring and heating reactants in the container, and cooling to room temperature to finally obtain a light yellow solution, namely a polyamine amide solution in the container; or evaporating the organic solvent from the light yellow solution obtained in the container to obtain light yellow waxy solid, namely polyamine amide. In application, polyamine amide is dissolved in an organic solvent to prepare a solution, the solution is added to crude oil to obtain a mixture, when the solidifying point of the crude oil is reduced by 5-25 DEG C and the viscosity of the crude oil is reduced by 30-80%, the mixture is prepared into an aqueous solution with mass concentration of 100-10000 ppm, and the corrosion inhibition of the aqueous solution is measured to obtain that the corrosion inhibition rate of the aqueous solution to the steel sheets in different concentrations of hydrochloric acid is 40-90%.

Description

technical field [0001] The invention relates to the technical field of polyamine amide, in particular to a preparation method and application of multifunctional polyamine amide for oil fields. Background technique [0002] Polymers with long alkyl side chains and comb-shaped polymers are an important class of polymers, such as polyacrylic high carbon alcohol ester, polyacrylic acid high carbon amine amide, polymaleic acid high carbon alcohol ester, polymaleic acid high carbon amine Copolymers of amides and their monomers or copolymers with monomers such as styrene and vinyl acetate, etc. This type of polymer can be used as a pour point depressant for high-point crude oil, a viscosity depressant for high-viscosity crude oil, a wax inhibitor for crude oil, a drag reducer for crude oil transportation, and other oilfield chemicals. At present, the main chain of this type of polymer used is a long alkyl chain, which functions as connecting side chains of monomers to form a polym...

AI Technical Summary

Problems solved by technology

However, there are many problems in practical applications, such as: the thermal stability of the main chain of the alkyl group is strong, and it is difficult to decompose into short-chain compounds in the refining stage after adding crude oil, and it is easy to form gel or carbon deposits; the long-chain alkyl group in the polymer The side has a structure similar to the wax in crude oil, and is easy to eutectic or adsorb with it. The polar part of the polymer plays the role of distorting the crystal nucleus, dispersing the wax crystal or inhibiting the further growth of the wax crystal, but the alkyl The polarity of the main chain is small and the effect is weak, relying on the twisted crystal nucleus of the ester group or amide group on the side chain