Method for controlling the use of water shutoff agents in oil wells in bottom water reservoirs

By establishing a mathematical model for the dosage of water shut-off agent in bottom-water reservoirs, refining the dosage and concentration of water shut-off agent, and precisely controlling the distribution of water shut-off agent, the problem of poor water shut-off effect in oil wells in bottom-water reservoirs was solved, resulting in increased oil production and improved recovery rate.

CN122304658APending Publication Date: 2026-06-30CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA NAT PETROLEUM CORP
Filing Date
2024-12-31
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

How to effectively control the usage parameters of water shut-off agents in bottom water reservoirs in order to improve the water shut-off effect of oil wells, reduce water cut, and increase oil production.

Method used

By acquiring reservoir properties and fluid seepage mechanisms, a mathematical model for the dosage of water shut-off agent is established to determine the total dosage of water shut-off agent. This is then refined into the dosage and concentration of multiple slugs, allowing for precise control of the distribution of water shut-off agent in the oil well and the injection of water shut-off agent to seal the bottom water channel.

Benefits of technology

It improves the water shut-off effect of wells in bottom water reservoirs, reduces water cut, increases oil production, avoids damage to the reservoir formation during the water shut-off agent injection process, and enhances recovery rate.

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Abstract

This application discloses a method for controlling the use of water-blocking agents in wells of bottom-water reservoirs. The method includes: obtaining the reservoir properties and fluid seepage mechanism of the bottom-water reservoir, wherein the reservoir properties include at least formation porosity; establishing a mathematical model for the dosage of water-blocking agents based on the reservoir properties and the fluid seepage mechanism, and determining the total dosage of water-blocking agents for the wells of the bottom-water reservoir based on the mathematical model; determining the dosage of multiple water-blocking agent slugs based on the total dosage of water-blocking agents, and obtaining the concentration of water-blocking agents in the multiple water-blocking agent slugs, wherein the sum of the dosages of water-blocking agents in the multiple water-blocking agent slugs is equal to the total dosage of water-blocking agents. The technical solution provided by this application can improve the water-blocking effect of wells in bottom-water reservoirs.
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