... sandstone numerical simulation indention Cundall drillstring design structural geology mechanism boundary bit selection drill pipe selection Simulation fragmentation indenter fracture grit Microstructure propagation back-scattered electron micrograph indentation grain boundary Piceance...

... geomechanics rollercone bit ROP model bit selection strength flow rate Reservoir Characterization Upstream Oil & Gas PDC bit bit design sandstone travel time unconfined rock strength rock strength rock mechanical test correlation cutter compressive strength information Hareland drilling...

... pressure). bit selection specific energy drilling operation strength cutter University triaxial test compaction thesis stress strain curve reservoir geomechanics cutting rock drillability high strain hydrostatic pressure Reservoir Characterization Upstream Oil & Gas modeling...