Gas pressure measurement borehole filling sealing material and using method thereof

[0019] The gas pressure measurement of the coal seam or the upward drilling hole through the seam or the gas pressure measurement of the drilling hole without water:

[0020] The mass percentage of each material is 90% of superabsorbent resin, 7% of composite cellulose ether, and 3% of polyacrylamide. Among them, the superabsorbent resin is selected from 5-10 mesh sodium polyacrylate, and the composite cellulose ether is made of hydroxypropyl methylcellulose. 70%, polyanionic cellulose 30%. Put the compound material above into the hydrophilic pouch, fix the hydrophilic pouch on the rear end of the gas pressure measuring flower tube, slowly send it into the target section, and carry out drilling and grouting for sealing.

[0022] Measurement of downward gas pressure in this coal seam and through long boreholes (large water content):

[0023] The mass percentage of each material is 93% of composite superabsorbent resin, 5% of composite cellulose ether, and 2% of polyacrylamide. 60%, 40 mesh sodium polyacrylate 20%, composite cellulose ether consists of 90% hydroxypropyl methylcellulose, 10% polyanionic cellulose. Put the compound material above into the hydrophilic pouch, fix the hydrophilic pouch on the rear end of the gas pressure measuring flower tube, slowly send it into the target section, and carry out drilling and grouting for sealing.

[0025] Downward gas pressure measurement of short boreholes through layers (little or no water content):

[0026] The mass percentage of each material is 90% composite superabsorbent resin, 7% composite cellulose ether, and 3% polyacrylamide. The composite superabsorbent resin consists of 50% of 5-10 mesh sodium polyacrylate, 10-25 mesh sodium polyacrylate 40%, 40 mesh sodium polyacrylate 10%, composite cellulose ether is composed of 60% hydroxypropyl methylcellulose, 40% polyanion cellulose. Put the compound material above into the hydrophilic pouch, fix the hydrophilic pouch on the rear end of the gas pressure measuring flower tube, slowly send it into the target section, and carry out drilling and grouting for sealing.

[0027] The hydrophilic pouches used in the above examples 1-3 are made of composite cotton material soaked with a hydrophilic surfactant solution with a mass percent concentration of 30-50% and dried.