Viscosity reduction process selection method for oil field with high asphaltene content

Through the emulsification and viscosity reduction process, chemical, biological and composite viscosity reducing agents are used to reduce the viscosity of heavy oil, which solves the problem of high viscosity in heavy oil mining, improves recovery rate and oil washing efficiency, and achieves low-cost heavy oil mining Effect.

CN119307244APending Publication Date: 2025-01-14克拉玛依四维石油科技有限公司 +1
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Patent Information

Application Number
CN202411381815.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-30
Publication Date
2025-01-14

AI Technical Summary

Technical Problem

The high viscosity and high asphaltene content of heavy oil make it difficult to effectively exploit it. The existing technology has low recovery rate and high cost, making it difficult to improve the oil field development effect.

Method used

By using the emulsification and viscosity reduction process, the biological viscosity reduction agent is prepared by selecting chemical viscosity reduction agents, biological viscosity reduction agents and composite viscosity reduction agents, combined with bacterial strain screening and fermentation processes, the appropriate viscosity of heavy oil is determined, and the viscosity of heavy oil is reduced. The viscosity reduction rate is measured by a rotary viscometer, and the optimal viscosity reduction agent is selected for heavy oil extraction.

Benefits of technology

The low-cost viscosity reduction effect of heavy oil is achieved, the recovery rate and impact coefficient are improved, the oil-water emulsification and migration are enhanced, the crude oil recovery rate and oil washing efficiency are improved, and the oil-philic capillary resistance is reduced.

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Abstract

The invention relates to the field of thickened oil recovery, and provides a viscosity reduction process selection method for an oil field with high asphaltene content. The specific process comprises the following steps: firstly, selecting different viscosity reducers, namely a chemical viscosity reducer, a biological viscosity reducer and a composite viscosity reducer, for different oil fields according to actual conditions; the biological viscosity reducer needs to be prepared through strain fermentation, and the composite viscosity reducer is obtained by compounding the biological viscosity reducer with a chemical emulsifier; determining an implementation scheme suitable for the viscosity reducer after the viscosity reducer is selected; then designing an experiment to evaluate the viscosity reduction effect of the selected viscosity reducer; and finally, selecting the viscosity reducer with the optimal viscosity reduction effect according to an experimental result and applying the viscosity reducer to a thick oil viscosity reduction process. The most suitable viscosity reducer can be selected through the process, and the recovery rate of crude oil is greatly improved.
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