TAO Yunqi
Henan Energy and Chemical Industry Research Institute Group Co., Ltd., Zhengzhou 450046, P. R. China;State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, P. R. ChinaZHANG Chaolin
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, P. R. ChinaXU Jiang
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, P. R. ChinaPENG Shoujian
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, P. R. ChinaFENG Dan
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, P. R. ChinaTD713+.34
Hydraulic flushing technology is one of the most widely used pressure relief and permeability improvement measures and it works well in soft and low permeability coal seams. The physical simulation of hydraulic flushing was determined based on self-developed hydraulic flushing test system, and two CBM drainage tests were conducted before and after hydraulic flushing in order to evaluate its pressure relief and permeability improvement. Equivalent drainage radius and effective drainage time were defined to evaluate the hydraulic flushing technology quantitatively. As a conclusion, the equivalent drainage radius increased to 1.7 times and the effective drainage time reduced to 56% after hydraulic flushing. The results indicate that hydraulic flushing can improve permeability of coal seam and drainage efficiency greatly by increasing the porosity and fissure of coal seam. Therefore, the key of hydraulic flushing technology is how to improve the porosity and fissure of coal seam effectively and stablely.
陶云奇,张超林,许江,彭守建,冯丹.水力冲孔卸压增透物理模拟试验及效果评价[J].重庆大学学报,2018,41(10):69~77
Copy
