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High-strength hole sealing agent for coal mine gas extraction drilling

A technology for drilling and mining gas in coal mines, which is applied in gas discharge, mining equipment, earthwork drilling and mining, etc. It can solve the problem of slow consolidation of ordinary Portland cement mortar, endangering human health and social safety, and failure to seal holes to reduce the risk of spontaneous combustion, prolong the period of gas drainage, and improve the quality of sealing holes

Pending Publication Date: 2021-03-12
山西潞安晋安矿业工程有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary Portland cement mortar has a slow consolidation speed, a large number of shrinkage cracks will be generated after solidification, the expansion factor is low, the sealing section cannot be sealed, and the sealing quality is poor; although polyurethane sealing materials are superior in performance, they are expensive and expensive. During the condensation process, the reaction temperature is as high as 130~140°C, which can easily cause spontaneous combustion of coal and endanger human health and social safety.

Method used

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  • High-strength hole sealing agent for coal mine gas extraction drilling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A high-strength sealing agent for coal mine gas drainage drilling, prepared from the following raw materials in parts by mass: 2 parts of graphene, 7 parts of short basalt fibers, 65 parts of Portland cement, 20 parts of anhydrous gypsum, 10 parts of fly ash, 1 part of bauxite, 2 parts of calcium sulfoaluminate, 0.5 parts of magnesium oxide, 0.5 parts of calcium oxide, 2 parts of powder polycarboxylate superplasticizer, 1 part of calcium acetate, 0.5 parts of calcium phosphate, 0.2 part of sodium aluminate, 0.1 part of sodium carbonate, and 0.1 part of quicklime; the length of short basalt fibers is 0.5-2mm.

[0020] The above raw materials are mixed into a uniform powder, and the prepared powder material is mixed with a certain amount of water to make a sealing agent, and the water-cement mass ratio is 0.5:1.

Embodiment 2

[0022] A high-strength sealing agent for coal mine gas drainage drilling, prepared from the following raw materials in parts by mass: 4 parts of graphene, 7 parts of short basalt fibers, 69 parts of Portland cement, 25 parts of anhydrous gypsum, 15 parts of fly ash, 1 part of bauxite, 1 part of calcium sulfoaluminate, 0.5 parts of magnesium oxide, 0.5 parts of calcium oxide, 1 part of powdered polycarboxylate superplasticizer, 1 part of calcium acetate, 0.5 parts of calcium phosphate, 0.2 parts of sodium aluminate, 0.2 parts of sodium carbonate, and 0.1 part of quicklime; the length of short basalt fibers is 0.5-2mm.

[0023] The above raw materials are mixed into a uniform powder, and the prepared powder material is mixed with a certain amount of water to make a sealing agent, and the water-cement mass ratio is 0.5:1.

Embodiment 3

[0025] A high-strength sealing agent for coal mine gas drainage drilling, prepared from the following raw materials in parts by mass: 5 parts of graphene, 5 parts of short basalt fibers, 50 parts of Portland cement, 25 parts of anhydrous gypsum, 15 parts of fly ash, 2 parts of bauxite, 1 part of calcium sulfoaluminate, 1 part of magnesium oxide, 0.5 parts of calcium oxide, 1 part of powder polycarboxylate superplasticizer, 1.5 parts of calcium acetate, 1 part of calcium phosphate, 0.2 parts of sodium aluminate, 0.1 parts of sodium carbonate, and 0.2 parts of quicklime; the length of short basalt fibers is 0.5-2mm.

[0026] The above raw materials are mixed into a uniform powder, and the prepared powder material is mixed with a certain amount of water to make a sealing agent, and the water-cement mass ratio is 0.5:1.

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Abstract

The invention discloses a high-strength hole sealing agent for coal mine gas extraction drilling, and relates to a grouting hole sealing material. The hole sealing agent is specifically prepared fromthe following raw materials in parts by mass: 2-5 parts of graphene, 4-8 parts of basalt short fibers, 50-70 parts of Portland cement, 20-25 parts of gypsum, 10-15 parts of fly ash, 2-5 parts of an expanding agent and 2-5 parts of an additive. The inorganic hole sealing agent provided by the invention is good in expansion performance, the highest expansion rate can reach 50%, holes can be effectively sealed, gas leakage channels of drilled holes are effectively reduced, the gas extraction period is prolonged, and the gas extraction concentration is improved.

Description

technical field [0001] The invention relates to a grouting sealing material, in particular to a high-strength sealing agent for coal mine gas drainage drilling. Background technique [0002] Due to the continuous progress of underground gas drainage, there are often problems such as poor sealing quality, large air leakage, and associated broken coal that is prone to spontaneous combustion. Therefore, a new gas drainage with expansion characteristics, high efficiency and low temperature is urgently needed. Drill hole sealing agent is used to improve the quality of hole sealing while reducing the risk of spontaneous combustion of broken coal near the drill hole, ensuring safe and efficient gas drainage. [0003] At present, the sealing agents for gas drainage are mainly polyurethane materials and ordinary Portland cement mortar. Ordinary Portland cement mortar has a slow consolidation speed, a large number of shrinkage cracks will be generated after solidification, the expans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14E21B33/13E21F7/00C04B111/70
CPCC04B28/14E21B33/13E21F7/00C04B2111/00724C04B2111/70C04B7/02C04B18/08C04B14/4643C04B14/026C04B22/06C04B22/064C04B22/066C04B22/14C04B2103/12C04B2103/10C04B2103/302C04B24/06C04B22/08C04B22/16
Inventor 白广平冯洁王留着陈萌萌
Owner 山西潞安晋安矿业工程有限责任公司
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