An oil-based gas drilling hole gas tightness enhancing device based on intelligent sealing material

By using a static mixing unit of polyurethane prepolymer and nano-montmorillonite clay mixture in the borehole, the problem of poor adaptability to curing shrinkage and deformation of traditional sealing materials is solved, and the high efficiency of borehole airtightness and gas extraction effect is achieved.

CN224314959UActive Publication Date: 2026-06-02YANAN CHECUN COAL IND (GRP) CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
YANAN CHECUN COAL IND (GRP) CO LTD
Filing Date
2025-08-25
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Traditional borehole sealing materials are prone to generating tiny annular gaps during the curing process and are difficult to adapt to the deformation of coal and rock masses, resulting in air leakage and reducing gas extraction efficiency and safety.

Method used

A mixture of polyurethane prepolymer and nano-montmorillonite clay is used to form an annular mixing chamber around the gas extraction pipe through a static mixing unit. This ensures that the material is fully mixed and has good flexibility to adapt to the deformation of the coal and rock mass. Combined with a pressure monitoring unit, precise sealing is achieved.

Benefits of technology

It improves the airtightness of the borehole, ensures stable negative pressure in the extraction pipeline, increases the concentration and total amount of gas extraction, and enhances the sealing quality and operational efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

This application provides a device for enhancing the airtightness of oil-type gas boreholes based on intelligent sealing materials, comprising a gas extraction pipe, a first conveying pipe, and a second conveying pipe arranged in parallel. One end of the gas extraction pipe is connected to the extraction system, and the other end passes sequentially through a static mixing unit wrapped with a bag of sealing material, with an extraction hole at the end. The shell of the static mixing unit and the gas extraction pipe form an annular mixing chamber containing a flow-tightening element. The first and second conveying pipes are respectively connected to a polyurethane prepolymer and a nano-montmorillonite clay conveying unit, injecting the materials into the mixing chamber through the injection hole, and then spraying them out from the annular nozzle after mixing. This device, through the combined effect of the two materials, ensures that the sealing material fully covers the borehole wall to avoid solidification and shrinkage gaps, while utilizing the flexibility of the nano-clay to adapt to the deformation of the coal and rock mass, effectively isolating the borehole from the outside environment, increasing the gas extraction concentration and total amount, and optimizing extraction efficiency.
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