Water shutoff and profile control agent for low-permeability reservoir and preparation method of water shutoff and profile control agent

A water shut-off and profile control agent for low-permeability oil reservoirs, prepared by crosslinking carboxymethyl cellulose and fumarate-salicylic acid amide, solves the problems of poor plugging performance and environmental unfriendliness in low-permeability oilfields, achieving high plugging rate and strong gel strength.

CN121991664APending Publication Date: 2026-05-08PETROCHINA CO LTD
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Patent Information

Application Number
CN202411580232.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-07
Publication Date
2026-05-08

AI Technical Summary

Technical Problem

Existing chemical water shut-off agents have poor sealing performance and are not environmentally friendly in low-permeability oilfields, making it difficult to meet the temperature resistance requirements of low-permeability reservoirs.

Method used

Using natural products such as carboxymethyl cellulose and fumarate acrylamide as the main raw materials, a water shut-off and profile control agent for low-permeability reservoirs is prepared through a cross-linking reaction. The carboxymethyl cellulose and fumarate acrylamide form a spatial network cross-linking, which improves the temperature resistance and plugging rate.

Benefits of technology

The prepared low-permeability reservoir water shut-off and profile control agent exhibits high plugging rate and strong gel strength at different temperatures, improving the plugging effect and possessing environmental friendliness.

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Abstract

The invention discloses a water shutoff and profile control agent for a low-permeability reservoir and a preparation method of the water shutoff and profile control agent. The water shutoff and profile control agent for the low-permeability reservoir comprises the following raw materials in parts by weight: 20-30 parts of carboxymethyl cellulose; 30 to 40 parts of fumaropimaryl acrylamide; 1-2 parts of a surfactant; 0.5 to 1 part of an initiator; and 5-10 parts of a cross-linking agent. The low-permeability reservoir water shutoff and profile control agent is obtained by crosslinking the carboxymethyl cellulose and the fumaropimaryl acrylamide, and the low-permeability reservoir water shutoff and profile control agent has high shutoff rate at different temperatures because the low-permeability reservoir water shutoff and profile control agent has high temperature resistance due to the addition of the fumaropimaryl acrylamide, so that the shutoff rate of the low-permeability reservoir water shutoff and profile control agent is high; the prepared water shutoff and profile control agent for the low-permeability oil reservoir has high gel strength due to the fact that carboxymethyl cellulose and fumaropimaryl acrylamide form spatial network crosslinking, the gel strength of the water shutoff and profile control agent is greatly improved, on the other hand, fumaropimaryl acrylamide can serve as a cross-linking agent, and the gel forming time is further prolonged.
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