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Coal mine gas extraction hole sealing material

A technology for coal mine gas and drainage holes, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as poor sealing effect, insufficient sealing length, and material toxicity, and achieve convenient use and operation, solidification Short time, good expansion effect

Inactive Publication Date: 2015-05-06
HENAN SHENHUA ENERGY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the sealing materials used in coal mines in my country are polyurethane sealing materials and ordinary cement mortar sealing materials. The former is prone to shrinkage after sealing, and the sealing effect is poor, while the latter is often unsatisfactory due to the length of the sealing hole. The sealed state, the material has certain toxicity, and the price is high, resulting in high sealing cost, which is difficult for coal mines to bear

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The invention provides a coal mine gas drainage hole sealing material. The components in the formula of the sealing material are as follows: 65% of ordinary portland cement, 25% of expansion agent, 9.5% of gypsum, Foaming agent 0.2%, caustic soda 0.3%, water and sealing material are mixed according to the mass ratio of 0.7. In this example, the ordinary Portland cement is selected as P.O 32.5 / 42.5 cement, and the expansion agent is calcium sulfoaluminate-calcium oxide expansion agent. The application of the expansion agent must comply with GB50119-2003 "Technical Specifications for the Application of Concrete Admixtures" "; The foaming agent is a solid or liquid that generates gas in an alkaline environment. Before use, it is stirred and ground with a chemical foam stabilizer, and used after it is air-dried. In this embodiment, the foaming agent is selected as aluminum powder. The purity of the aluminum powder should be industrial pure.

[0016] Since the gypsum is mai...

Embodiment 2

[0019] In this embodiment, the components in the formula of the sealing material are as follows: 64.4% of ordinary Portland cement, 25% of expansion agent, 10% of gypsum, 0.1% of foaming agent, 0.5% of caustic soda, The formula of water and hole sealing material is mixed and used according to the mass ratio of 0.7. Other implementation conditions are all identical with embodiment 1.

Embodiment 3

[0021] In this embodiment, the components in the formula of the sealing material are as follows: 70% of ordinary Portland cement, 20% of expansion agent, 9.5% of gypsum, 0.3% of foaming agent, 0.2% of caustic soda, The formula of water and sealing material is mixed and used according to the mass ratio of 0.6. In this embodiment, the expansion agent is selected as calcium sulfoaluminate expansion agent, and the application of the expansion agent must comply with GB50119-2003 "Technical Specifications for the Application of Concrete Admixtures". 99%, particle size is 0.8mm. Other implementation conditions are all identical with embodiment 1.

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Abstract

The invention relates to a coal mine gas extraction hole sealing material. The coal mine gas extraction hole sealing material comprises, by mass, 60-80% of ordinary portland cement, 15-25% of an expanding agent (such as calcium sulphoaluminate and calcium sulphoaluminate-calcium oxide), 0-10% of gypsum, 0.1-0.3% of a foaming agent (such as solid aluminum powder or liquid hydrogen peroxide producing gas in an alkaline environment), and 0.2-0.5% of caustic soda, and the above materials and water are blended according to a mass ratio of 1: 0.6-1. The coal mine gas extraction hole sealing material has good expansibility, has an expansion coefficient greater than 10%, compressive strength greater than 10Mpa, good fluidity and short solidification time, is convenient for use and has a low cost.

Description

technical field [0001] The invention relates to a hole sealing material for gas drainage holes in coal mines, in particular used for sealing holes of gas drainage holes in coal mines, and belongs to the technical field of coal mining. Background technique [0002] Underground gas drainage in coal mines is still an important method for coal mine gas control. Drilling is the basic technical means of coal mine gas control, and it is widely used in various aspects such as gas drainage, parameter testing, coal seam water injection, and coal seam permeability enhancement. After the borehole is drilled, it is generally required to seal the borehole, and the borehole seal is a key factor for maintaining negative or positive pressure at the bottom of the hole. The quality of hole sealing directly affects the performance of various drilling functions. At present, most of the sealing materials used in coal mines in my country are polyurethane sealing materials and ordinary cement mort...

Claims

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Application Information

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IPC IPC(8): C09K8/467C04B28/04
CPCC09K8/426C04B28/14C04B38/02
Inventor 曹运兴赵斌张军胜曹永恒田林石玢马兵王建涛
Owner HENAN SHENHUA ENERGY ENG
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