Reusable expansion-type paste drilling-hole sealing material based on coal gangue powder

Abstract

The invention discloses a reusable expansion-type paste drilling-hole sealing material based on coal gangue powder. The material comprises a hole-sealing dry-mixed material and a hole-sealing wet-mixed compound, and the dry-mixed material comprises the following components: 7.5-8 parts of coal gangue powder, 0.08-0.1 part of a silicate, 0.08-0.1 part of an expanding agent, 0.3-0.35 part of cellulose, 1.49-1.55 parts of a water-retaining agent, 9-9.5 parts of water, 0.18-0.2 part of a coupling agent and 0.54-0.57 part of resin. The reusable expansion-type paste drilling-hole sealing material provided by the invention can permeate into small cracks around drilling holes under the action of grouting pressure for achieving the purpose of plugging; the cellulose prepared by mixing methyl cellulose and hydroxyethyl cellulose is adopted, so that the viscosity of the system and the stability of the prepared paste are improved; and a super absorbent polymer (SAP) is used as the water-retainingagent, so that water is not easily lost, and the purpose that the material can be expanded again by water injection when water is lost can be achieved.

Description

technical field [0001] The invention relates to a reusable expansion type paste drilling sealing material based on coal gangue powder, in particular to a method for preparing and using a reusable expansion type paste drilling sealing material based on coal gangue powder, which belongs to coal seam gas control technology field. Background technique [0002] my country is the main coal-producing country in the world, and it is also one of the most serious coal and gas outburst countries. The structure of my country's coal reservoirs is complex, and it is "three lows and one high" (coal seam pressure is low, coal seam permeability is low, and the proportion of long intentional cracks formed under enhanced measures such as water fracturing is low; coal seams generally have Higher adsorption force) physical characteristics. At present, gas drainage is the most effective measure to prevent and control gas disasters. The primary task of gas drainage is to construct and drill holes...

AI Technical Summary

Problems solved by technology

At present, there is a problem of lax sealing of holes in gas drainage, resulting in serious gas leakage during the extraction process, rapid decay of gas concentration, difficulty in extraction, and low efficiency

[0003] At present, the drilling and sealing technologies commonly used in my country's coal mine gas drainage include: cement mortar sealing, polyurethane sealing, hole sealing, etc. Although these technologies are widely used, there are some defects, such as cement mortar sealing. There will be a gap between the back and the drilled wall; the polyurethane sealing operation is cumbersome, and the technical requirements for the sealing personnel are high, and it is easy to cause waste of materials and pollute the environment; the sealing cost of the hole sealing device is high and the sealing depth limited