Alkali-activated fly ash rapid gel hole sealing material as well as preparation method and application thereof

By preparing an alkali-activated fly ash rapid gel sealing material, the problems of long setting time and poor stability of existing sealing materials were solved, achieving rapid gelation and long-term high-efficiency sealing, thus improving gas extraction efficiency.

CN121108523APending Publication Date: 2025-12-12SHANXI COAL TRANSPORTATION & MARKETING GRP JINNENG COAL MINE ENG CO LTD
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Patent Information

Application Number
CN202511104209.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-07
Publication Date
2025-12-12

AI Technical Summary

Technical Problem

Existing gas borehole sealing materials have long setting times, poor stability, and are prone to water loss and shrinkage, which can cause cracks in the surrounding rock of the borehole, affecting gas extraction efficiency and utilization.

Method used

A rapid gel sealing material for fly ash activated by alkali is developed. A polyacrylamide hydrogel precursor solution is prepared by acrylamide monomer and crosslinking agent, mixed with fly ash, and alkali accelerator and thermal initiator are added. The mixture is then allowed to stand and solidify to form a flexible gel sealing material.

Benefits of technology

Rapid gelation was achieved. The material has low viscosity and fluidity before gelation, which can penetrate and fill cracks. After gelation, it has good toughness and flexibility, which improves the sealing quality and gas extraction efficiency.

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Abstract

The invention discloses an alkali-activated fly ash rapid gel hole sealing material as well as a preparation method and application thereof, and belongs to the technical field of preparation of flexible hole sealing materials for gas drilling. The invention provides an alkali-activated fly ash rapid gel hole sealing material which is prepared by the following steps: mixing a polyacrylamide hydrogel precursor solution prepared from an acrylamide monomer and a cross-linking agent with fly ash, adding an alkali accelerator and a thermal initiator, and standing. The preparation method comprises the following steps: mixing an acrylamide monomer, deionized water and a cross-linking agent to obtain a polyacrylamide hydrogel precursor solution, and mixing the polyacrylamide hydrogel precursor solution with fly ash to obtain a mixed solution; mixing sodium hydroxide and deionized water to obtain an alkali accelerant; and mixing with the mixed solution, adding a thermal initiator, standing and curing to obtain the rapid gel hole sealing material. The rapid gel hole sealing material prepared by the invention can be rapidly gelated in a short time, and can well permeate into cracks for filling; after gelling, certain obdurability is achieved, deformation is achieved along with the change of the stress effect, and long-term and efficient sealing performance is achieved.
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