Method for dividing different water invasion risk grade zones of carbonate rock bottom water gas reservoir and application thereof

By meticulously delineating the water intrusion risk level zones of carbonate bottom-water gas reservoirs, and combining the distribution of gas and water layers within the reservoir, the activity of the bottom water body, and water intrusion channels, the problem of inaccurate delineation in existing technologies has been solved, enabling efficient and rational gas reservoir development, reducing water intrusion damage, and improving recovery rates.

CN122169808APending Publication Date: 2026-06-09PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Filing Date
2024-12-06
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

The existing methods for classifying water intrusion risk zones in carbonate bottom water gas reservoirs are inaccurate, making it difficult to accurately achieve water intrusion early warning and affecting the development effect of gas reservoirs.

Method used

By analyzing the relative distribution of gas and water layers, the activity of bottom water, and the distribution of water intrusion channels and fractures within the gas reservoir, it is divided into five categories: high-risk longitudinal intrusion, low-risk longitudinal intrusion, high-risk lateral intrusion, low-risk lateral intrusion, and low-risk areas. Adaptive development technology strategies are proposed based on different risk levels.

Benefits of technology

It improved the accuracy of water intrusion risk level zone classification, reduced water intrusion damage to gas reservoirs, and improved the ultimate recovery rate of gas reservoirs.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses a method and application for classifying different water invasion risk levels in carbonate bottom-water gas reservoirs, belonging to the field of oil and gas field development technology. The method includes the following steps: S1, obtaining the relative distribution of gas and water layers in each sublayer of the gas reservoir under study; S2, evaluating the activity of the bottom water body; S3, dividing the block into sealed and unsealed zones; S4, obtaining the distribution of faults, fractures, and high-quality reservoirs in the water invasion channel; S5, based on the bottom water activity obtained in step S2 and the distribution of faults and fractures in the water invasion channel obtained in step S4, classifying the gas reservoir in the study area into five categories: high-risk longitudinal intrusion, low-risk longitudinal intrusion, high-risk transverse intrusion, low-risk transverse intrusion, and low-risk zones. This method is beneficial for the efficient and rational development of bottom-water gas reservoirs, reducing the degree of water invasion damage to the gas reservoir, and improving the final recovery rate of the gas reservoir.
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