Heavy oil asphaltene dispersant for improving the stability of heavy oil

Abstract

The invention provides a heavy oil asphaltene dispersant for improving the stability of heavy oil, and belongs to the field of heavy oil exploitation. The heavy oil asphaltene dispersant can effectively improve the stability of heavy oil, is remarkable in improvement effect, can achieve an ideal improvement effect with a relatively small use amount, is low in use cost, and has no effect on subsequent production and processing of heavy oil. The heavy oil asphaltene dispersant is prepared by mixing a Tween-based surfactant and an alcohol solvent, wherein the mass ratio of the Tween-based surfactant to the alcohol solvent is 1:(4-9).

Description

technical field [0001] The invention belongs to the field of heavy oil exploitation, in particular to a heavy oil asphaltene dispersant for improving the stability of heavy oil. Background technique [0002] Heavy oil is a continuously distributed and dynamically stable colloidal system, including asphaltenes, colloids, aromatics and saturated components. Among them, asphaltene is the dispersed phase in the system, and it is also the most polar component in the heavy oil. Its molecules have intermolecular forces such as dipole force, charge transfer force, and hydrogen bond force. The presence of force makes asphaltenes have a strong self-association tendency. Saturated components and aromatic components are the dispersion medium in the system, among which, the aromatic components are relatively weak in polarity, while the saturated components have almost no polarity. Colloid is a natural asphaltene stabilizer in heavy oil, its polarity is between asphaltene and aromatic c...

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Problems solved by technology

Traditional asphaltene dispersants are mainly obtained through synthesis, but there are problems such as long synthesis period, many by-products, complicated preparation process, and synthetic raw materials are not conducive to environmental friendliness.

In order to simplify the preparation process, people began to use compounding methods to prepare asphaltene dispersants. For example, Professor Li Yongtai developed a water-based asphalt high-temperature dispersion stabilizer, which consists of dispersants, co-solvents, C-F, and Si-F surfactants. It is compounded with water, but the improvement effect of this asphaltene dispersant on the stability of heavy oil is not ideal, and the effective improvement effect can only be obtained when the amount of use is greater than 16%, and the use cost is high. Moreover, this asphaltene The dispersant contains a large amount of water, and subsequent treatment needs to increase the demulsification process, and the waste water after demulsification also needs further treatment, which greatly increases the application cost

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