瓦斯抽采钻孔CF固化膨胀封孔材料性能研究

Research on Performance of CF Solidification Expansion Sealing Material for Gas Extraction Drilling

针对传统常见瓦斯抽采钻孔封孔材料中存在的固化收缩、初凝过快和强度不足等问题，为保证井下瓦斯抽采效果，研发出CF固化膨胀封孔材料。CF材料以普通水泥为主料，配入一定质量比的缓凝剂、稳定剂和膨胀剂，并与一定水混合搅拌后制成封孔浆液材料。测试对比了CF材料与普通水泥、聚氨酯及膨胀水泥在初凝时间、黏度、膨胀性能和强度4个方面的参数，并得出CF材料各成分配比的优劣性。研究结果表明：CF材料在料水比为5∶3、缓凝剂质量比含量为1.5%～2%、膨胀剂质量比含量为2%～3%下具有流动性较好、黏度较高、膨胀体积和稳定膨胀时间适中的特点，且具有较高的抗压强度，材料4种性能参数均优于其他常见封孔材料。

Aiming at the issues of solidify shrinkage, too fast initial setting time and lack of strength that exists in the traditional sealing material for gas extraction drilling, CF solidify expansion sealing material is developed to insure gas extraction of coal mines. CF material is based on Portland cement, mixed with a certain ratio of retarder, stabilizers and bulking agents, and blended with amount of water. Tests compared CF material with ordinary cement, polyurethane and expanded cement in four areas of parameters which are the initial setting time, viscosity, expansion and strength. Also the ratio of each component in CF material is compared. The results show that CF material has better mobility, higher viscosity, expansion and stabilization moderate expansion time characteristics, and has a high compressive strength under the condition that the solid water ratio is 5∶3, retarder mass ratio is 1.5% to 2% and expansion mass ratio is 2% to 3%. Meanwhile, four performance parameters are superior to other common sealing materials.