A development method of steam stimulation and superposition of viscosity reducer flooding in deep extra-heavy oil reservoirs

By using the steam throughput and superimposed viscosity-reducing agent flooding development method in deep-heat oil reservoirs, the problem of low development efficiency of deep-heat oil reservoirs is solved, and rapid results and economic benefits are achieved.

CN115387767BActive Publication Date: 2025-03-28CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202110549746.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-05-20
Publication Date
2025-03-28
Estimated Expiration
2041-05-20

AI Technical Summary

Technical Problem

Deep-layer extra-heavy oil reservoirs are difficult to develop effectively, conventional water flooding and thermal development efficiency are low, existing viscosity-reducing agent flooding methods take effect for a long time, low liquid production, and poor economic benefits.

Method used

The steam throughput and viscosity reduction agent flooding development method is adopted to quickly inject viscosity reduction agents in stages, and the injection wells are quickly injected with high pressure, low speed and high pressure, and steam injection and steam throughput and efficiency of production wells, establishing an effective displacement relationship between injection and production wells.

Benefits of technology

Rapidly improve the development efficiency of deep-layer extra-heavy oil reservoirs, shorten the effect time, improve recovery rate and net oil production, and significantly improve economic benefits.

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Abstract

The present invention relates to the technical field of heavy oil reservoir development, and specifically to a method for developing deep extra-heavy oil reservoirs by steam stimulation and effect superimposed on viscosity reducer flooding. The method comprises the following steps: screening heavy oil blocks in the target reservoir; drilling a group of injection and production wells in the selected heavy oil blocks; injecting viscosity reducers into the injection wells in stages by high-pressure rapid, normal-pressure low-speed, and high-pressure rapid methods; injecting steam stimulation and effect into the production wells until an effective displacement relationship is established between the injection and production wells; changing the injection method of the viscosity reducer, and continuous production in the production wells. The method of the present invention is used to develop deep extra-heavy oil reservoirs, with a fast effect time and significantly improved economic benefits.
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