Method for establishing and using injection-production well adjustment chart in polymer flooding recovery period of three types of oil layers

By establishing an adjustment chart for injection and production wells during the recovery period of polymer flooding in three types of oil reservoirs, the problem that the adjustment technology for type I oil reservoirs is not applicable to type III oil reservoirs in the existing technology has been solved. This has improved the development effect of polymer flooding in type III oil reservoirs, controlled the water cut recovery rate, and increased the recovery rate.

CN122169760APending Publication Date: 2026-06-09DAQING OILFIELD CO LTD +1
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Patent Information

Application Number
CN202411791651.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-06
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

The existing polymer flooding tracking and adjustment technology for Class I oil layers is not suitable for Class III oil layers and cannot guide the tracking and adjustment of injection and production wells during the water-cut recovery period, resulting in poor polymer flooding development effect in Class III oil layers.

Method used

Establish a tracking and adjustment chart for injection and production wells during the recovery period of polymer flooding in three types of oil reservoirs, including adjustment charts for injection wells and production wells. Through fracturing, subdivision adjustment, enrichment, and regional division of reasonable zones, corresponding well adjustments are made based on parameters such as the proportion of fluid absorption thickness, the maximum relative fluid absorption of a single layer, and the degree of production.

Benefits of technology

It effectively improved the polymer flooding development effect of three types of oil reservoirs, controlled the water cut recovery rate, and increased the reservoir thickness and recovery rate.

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Abstract

The invention discloses a three-type oil reservoir polymer flooding recovery period injection-production well tracking adjustment chart establishing method, relates to the field of three-type oil reservoir tertiary oil recovery, and solves the problem that an existing one-type oil reservoir polymer flooding tracking adjustment technology is not suitable for tracking adjustment of three-type oil reservoirs. The method comprises the steps of establishing an injection well and production well adjustment chart; the method for establishing the injection well adjustment chart comprises the steps that the liquid absorption thickness proportion of an injection well is the length of a rectangle, and the length range is 40-100; forming a rectangular plate by taking the maximum relative liquid absorption amount of a single layer as the width of a rectangle and the length range of 0-100; the plate is divided into a fracturing area, a subdivision adjustment area, a concentration area and a reasonable area; the establishment method of the production well adjustment plate comprises the steps that the production well stage production degree is taken as the length of a rectangle, the length range is 0-35, the water content is taken as the width of the rectangle, and the length range is 60-100, so that a rectangular plate is formed; the plate is provided with a fracturing area, a reasonable area, a concentration area and a fracturing water plugging area.
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