Flexible gel(FG) for gas-drainage drilling sealing material based on orthogonal design  

作　　者：Zhai Cheng Xu Jizhao Xiang Xianwei Zhong Chao 

机构地区：[1]State Key Laboratory of Coal Resources and Mine Safety [2]School of Safety Engineering, China University of Mining and Technology

出　　处：《International Journal of Mining Science and Technology》2015年第6期1031-1036,共6页矿业科学技术学报（英文版）

基　　金：supported by the Central Universities Special Funds for Fundamental Research Funds of the China University of Mining and Technology (No. 2013ZDP01);the National Natural Science Foundation of China (Nos. 51274195 and U1361106);the Natural Science Foundation of Jiangsu Province (No. BK2012571);the National Major Scientific Instrument and Equipment Development Project (No. 2013YQ17046309);the Program for New Century Excellent Talents in University (No. NCET-12-0959);the Qing Lan Project

摘　　要：Aiming to resolve the technical problems of lower gas concentrations and a reduced effective drainage period caused by gas-drainage borehole fracture development, a flexible gel （FG） gas-drainage borehole sealing material was developed that adapts to borehole deformation. In this study, based on orthogonal tests, the effect of the ratio of material to water, stirring time and stirring speed on the viscosity, filtration property, water retention and pumpability of the FG were studied. The results indicate that the stirring speed, ratio of material to water and stirring time in turn increased the viscosity and the ratio of material to water, stirring time and stirring speed enhanced the filtration property and water retention. The FG pumps smoothly and achieves the optimal state of high water retention, low fluid loss and low viscosity when the ratio of material to water is 1：10, the stirring speed is 800 r/min, and the stirring time is 12 min. The field test results indicate that, after using the FG, the average drainage gas concentration increases by 25.9% and 27.6g and the average negative pressure of extraction increases by 2.7 kPa and 3.5 kPa com- pared with expansive cement and polyurethane, respectively.Aiming to resolve the technical problems of lower gas concentrations and a reduced effective drainage period caused by gas-drainage borehole fracture development, a flexible gel(FG) gas-drainage borehole sealing material was developed that adapts to borehole deformation. In this study, based on orthogonal tests, the effect of the ratio of material to water, stirring time and stirring speed on the viscosity, filtration property, water retention and pumpability of the FG were studied. The results indicate that the stirring speed, ratio of material to water and stirring time in turn increased the viscosity and the ratio of material to water, stirring time and stirring speed enhanced the filtration property and water retention. The FG pumps smoothly and achieves the optimal state of high water retention, low fluid loss and low viscosity when the ratio of material to water is 1:10, the stirring speed is 800 r/min, and the stirring time is 12 min.The field test results indicate that, after using the FG, the average drainage gas concentration increases by25.9% and 27.6% and the average negative pressure of extraction increases by 2.7 k Pa and 3.5 k Pa compared with expansive cement and polyurethane, respectively.

关 键 词：Gas drainageFlexible gelOrthogonal designLiquidityFiltration propertyWater retention 

分 类 号：TD712.6[矿业工程—矿井通风与安全]