Delayed expansion type composite drilling sealing material

Abstract

The invention discloses a delayed expansion type composite drilling sealing material, which comprises a microcapsule expanding agent, high-dispersity cement and a polymer mixture. Specifically, the microcapsule expanding agent comprises the following substances by mass: 2% of sodium alginate, 2% of gelatin, 4% of an expanding agent and 92% of water; the high-dispersity cement comprises the following substances by mass: 66% of Portland cement, 33% of water and 1% of a dispersing agent; and the polymer mixture comprises the following substances by mass: 49% of resin, 49% of a curing agent, and 2% of a coupling agent. The microcapsule expanding agent, the high-dispersity cement and the polymer mixture are mixed in a mass ratio of 0.02:1:0.06 to obtain the delayed expansion type composite drilling sealing material. The delayed expansion type composite drilling sealing material provided by the invention can permeate into fissures around hole walls under a grouting pressure, the polymer mixture improves the compactness, impermeability and mechanical strength of the sealing material, the microcapsule expanding agent delays the onset time of the expanding agent, and lowers the influence ofthe expanding agent on the compactness of the material, thus realizing expansion-strength coordinated development.

Description

technical field [0001] The invention designs a delayed-expansion composite drilling sealing material, in particular a method for preparing and using a delayed-expansion composite drilling sealing material, and belongs to the technical field of coal seam gas control. [0002] technical background [0003] my country's coal mining is dominated by underground mining. The coal seam occurrence conditions are complex and changeable, coal disasters are frequent, and gas accidents are particularly serious. Gas drainage is the basic control method for coal mine gas control. The quality of borehole sealing determines the effect of gas drainage. strength. [0004] At present, the commonly used sealing technologies for gas drainage in my country include cement mortar sealing, polyurethane sealing, and hole sealing device sealing, etc. Among them, the cement mortar sealing material loses water and shrinks during the solidification process, leaving pores; the polyurethane sealing operation ...

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used sealing technologies for gas drainage in my country include cement mortar sealing, polyurethane sealing, and hole sealing device sealing, etc. Among them, the cement mortar sealing material loses water and shrinks during the solidification process, leaving pores; the polyurethane sealing operation is complicated. The material is poor in density and the cost is high; the sealing depth of the hole sealer is limited and the cost is extremely high