A heat-resistant and salt-resistant heavy oil viscosity reducer and preparation method thereof

By developing a temperature-resistant and salt-resistant heavy oil viscosity-reducing agent containing C8-C18 linear alkyl, benzene ring, naphthalene ring and sulfonic acid group, the problems of poor effect of heavy oil viscosity-reducing agent under different geological conditions and unstable performance under high temperature and high salt conditions in the prior art are solved, and efficient and stable heavy oil viscosity-reducing effect is achieved.

CN116514686BActive Publication Date: 2025-03-25SHIJIAZHUANG HUARONG MUD MATERIAL CO LTD
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Patent Information

Application Number
CN202310298514.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-24
Publication Date
2025-03-25
Estimated Expiration
2043-03-24

AI Technical Summary

Technical Problem

In the prior art, it is difficult to find a chemical viscosity reducer that can effectively reduce the viscosity of heavy oil under different geological conditions during heavy oil mining, and the commonly used chemical viscosity reducer has unstable performance under high temperature and high salt conditions.

Method used

A temperature-resistant and salt-resistant heavy oil viscosity reducing agent has been developed. Its molecular structure contains linear alkyl, benzene ring, naphthalene ring and sulfonic acid group of C8-C18. It is prepared by a simple synthesis process and clean process, and can maintain stable performance under high temperature and high salt conditions.

Benefits of technology

The heavy oil viscosity reducing agent can achieve a viscosity reduction of more than 99% at low concentration (1000mg/L), and after being placed at 80000mg/L mineralization and 300℃ for one week, it basically does not affect performance, significantly improving the efficiency and stability of heavy oil mining.

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Abstract

The present invention belongs to the field of oil production technology, and specifically relates to a heat-resistant and salt-resistant heavy oil viscosity reducer and a preparation method thereof. The preparation method is as follows: 6-(p-toluidine)-2-naphthalenesulfonate sodium (335), deionized water, bromoalkane are added in sequence, the temperature is raised while stirring, and the pH is maintained at 9-10; the temperature is lowered to below 5°C again, solids are precipitated, and filtered; the above-mentioned solids, solvents, and sodium chlorosulfonate are added in sequence, the pH is adjusted while stirring, and after all are dissolved, the solids are heated to reflux, and the reduced pressure distillation is performed to obtain a viscous brown solid, which is a crude product; recrystallization is performed to obtain a heat-resistant and salt-resistant heavy oil viscosity reducer. The heavy oil viscosity reducer has the advantages of simple synthesis process, heat and salt resistance, and good viscosity reduction effect.
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