Study of Micro-Parameters of DEM Model on the Laboratory Experiment Results Obtained from Poorly Cemented Sandstone

Borehole convergence during or after drilling is one of the primary indicators borehole instability. Early recognition instability critical in achieving successful and timely completion operations for exploitation. A series numerical simulations was conducted to investigate poorly cemented sandstones using Discrete Element Method (DEM). Rectangular 2-dimensional Particle Flow Code 2D (PFC2D) models were generated study effect contributing micro-parameters such as stiffness ratio, friction angle, coefficient effective modulus on behaviour sandstone subjected triaxial compression tests. good agreement between calibrated experimental data obtained from laboratory observed. The results showed that ratio found be a dominant factor calibrating model, most influential micro-parameter.