Sustained-release gel breaker, intelligent controllable temperature-resistant temporary plugging agent and preparation method thereof

By preparing a slow-release breaker and a smart, controllable, temperature-resistant temporary plugging agent, and utilizing a complexation reaction to control the breaker time at high temperatures, the problem of plugging and unplugging of temporary plugging agents under high-temperature conditions was solved. This achieved efficient plugging and low-cost unplugging effects, and is suitable for profile control, water shut-off, fracturing, and acidizing in high-temperature reservoirs.

CN117801797BActive Publication Date: 2026-06-09PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
PETROCHINA CO LTD
Filing Date
2022-09-23
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing temporary plugging agents are not ideal for unblocking under high temperature conditions, and the cost of secondary injection of breaker agents is high, making it difficult to achieve efficient sealing and unblocking, especially in high-temperature reservoirs where their application is greatly limited.

Method used

The method employs a slow-release gelling agent and a smart, controllable, temperature-resistant temporary plugging agent. The gel breaking time is controlled at high temperature through a complexation reaction. The chemical bonds of the complex formed by the silver salt and the complexing agent break at high temperature, releasing metal ions to break the gel. The preparation method includes mixing the silver salt and the complexing agent and heating the reaction to adjust the pH value.

Benefits of technology

It achieves rapid gelation at 90-120℃, extends the gel breaking time controllably (10-30 days), and can seal with a single injection, achieving a sealing rate of up to 90%. This reduces the cost and time of secondary injection of gel breaking agent and is suitable for oilfield measures such as profile control, water shut-off, fracturing, and acidizing.

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Abstract

The present application belongs to the technical field of oil field chemistry, and particularly relates to a slow-release gel breaker, an intelligent controllable temperature-resistant temporary plugging agent and a preparation method thereof. The raw materials of the slow-release gel breaker include the following components in parts by weight: silver salt and a complexing agent, wherein the complexing agent is ammonia or 1,4-dicyanobenzene; the raw materials of the intelligent controllable temperature-resistant temporary plugging agent include the following components in parts by weight: the slow-release gel breaker, a thickening agent, an initiator and a crosslinking agent. The preparation method includes mixing and reacting the silver salt and the complexing agent to obtain the gel breaker, dissolving the thickening agent in water, adding the initiator, the crosslinking agent and the gel breaker, mixing and reacting to obtain the product. Compared with the existing temporary plugging agent technology, the present application has the advantages of low viscosity before injection, one-time injection into the formation, arbitrary control of gel breaking time, plugging rate greater than 90%, good plugging property, reduced cost and time of secondary injection of the gel breaker, and important significance for oil field measures such as profile control, water plugging and acidizing fracturing.
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