Asphaltene dispersant composition and method for dispersing asphaltene deposits

Abstract

The present invention provides an asphaltene dispersant composition and a method of dispersing asphaltene deposits. The asphaltene dispersant composition comprises an ester-based polymer, sorbitan fatty acid ester and / or alkylbenzene, and the structure of the ester-based polymer is shown in the specification, wherein group T represents the main chain of the ester-based polymer; group B is selectedfrom O and S; y groups R are same or different from each other, and are independently selected from C1-10 alkyl; y groups A are same or different from each other, and are independently selected fromO, S or NH; R' is preferably a C1-10 alkyl group, and y is preferably an integer between 1 and 6; and two Nb in the repeating unit are independently selected from H or -R''-BH, R'' is preferably C1-10alkyl, at least one of the two Nb is selected from - R''-BH, and m is an integer between 1 and 10. The composite dispersant disclosed by the invention has very excellent dispersing properties and isparticularly suitable as a dispersant for the asphaltene deposits.

Description

technical field [0001] The invention relates to a dispersant composition, in particular to a dispersant composition for dispersing asphaltene deposits. Background technique [0002] Asphaltene is generally defined as a petroleum component that is insoluble in n-heptane but soluble in toluene. It is a class of substances defined by solubility. It is the highest relative molecular mass, the strongest polarity and the most difficult to process in heavy oil. components. The existence of asphaltene makes heavy oil have the characteristics of a colloidal system. When the environment of asphaltene changes due to changes in temperature, pressure or composition, asphaltene is prone to flocculation and deposition, which greatly affects the production, storage, transportation and processing of petroleum. bring about adverse effects. In the process of oil exploitation, the flocculation deposition of asphaltene will lead to the reduction of rock permeability and wettability reversal, r...

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Problems solved by technology

In the process of oil exploitation, the flocculation deposition of asphaltene will lead to the reduction of rock permeability and wettability reversal, resulting in permanent reservoir damage, and at the same time, it will also cause the blockage of peripheral equipment such as well pipes and separators, making production The efficiency is seriously reduced; during the transportation and storage of petroleum, the flocculation and deposition of asphaltenes will lead to fouling of the pumping pipeline and related processing equipment, which seriously affects the transmission efficiency; during the processing of petroleum, asphaltenes are used as coke precursors Deposition of substances on hot solid surfaces (such as reactor walls, heating furnace tubes, and heat exchanger walls) will cause coking and deactivation of catalysts or coking and fouling of devices, resulting in reduced production efficiency. and the difficulty of using

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