Model for simulating hydromechanical responses in aquifers to induced hydraulic stresses: Laboratory investigation and model validation
The environmental consequences of the hydraulic fracturing of shale beds have raised widespread concern, especially with regard to groundwater.For example, the hydraulic pressure and permeability in an upper aquifer may be affected by a flow injection process owing to the interaction between the fluids and the deformation of porous media.To experimentally investigate the hydromechanical (HM) effect of the induced hydraulic stresses, a column device was developed.The acquired experimental data was used to develop a coupled HM numerical model, which was used to further investigate the upper aquifer properties.A multiphysics simulator was used to implement the relationship between the permeability and the volumetric strain, and the permeability of the numerical model was calibrated by an error analysis.The results of the HM model were compared with those of a single flow model, and the variations of the hydraulic pressure and permeability with the injection pressure were also analyzed.It was found that the coupled HM model was more sensitive to changes in the permeability compared to the single flow model, and that the former produced better numerical results.The hydraulic pressure in the upper aquifer was determined to decrease with increasing height and the largest change was 1.13 times the initial value.Furthermore, the largest permeability change was observed to correspond to an injection pressure of 40 kPa and was 3.33E-4 times the initial value.This maybe neglected.A higher injection pressure was further found to increase the permeability, which also generally increased with increasing height.
Groundwater Hydromechanical Numerical modeling Laboratory experiments Shale gas
Yaqiang Wei Yanhui Dong Pengpeng Zhou Liheng Wang
Key Laboratory of Shale Gas and Geoengineering, Institute of Geology, and Geophysics, Chinese Academ Key Laboratory of Shale Gas and Geoengineering, Institute of Geology, and Geophysics, Chinese Academ
国际会议
中国科学院地质与地球物理研究所2016年度(第16届)学术年会
北京
英文
427-427
2017-01-01（万方平台首次上网日期，不代表论文的发表时间）