SIMULATION OF SHAPED-CHARGE JET PENETRATION INTO DRAINED AND UNDRAINED SANDSTONE USING THE MATERIAL POINT METHOD WITH NEW APPROACHES FOR CONSTITUTIVE MODELING

Simulation of wellbore completion by shaped-charged jet penetration in porous rock is highly nontrivial and requires a computational method that can support high-rate large deformation, with multiple materials and evolving contact surfaces. A computational approach is presented, using the Uintah open-source computational framework [4] implementation of the material point method along with recent kinematic advancements. A novel constitutive model is used to predict the response of the target material allowing for a dynamically evolving pore fluid pressure within an effective stress framework. Results are presented showing key experimental validation of the trends in penetration depth vs. pore pressure and confining stress, as well as the effect of nonassociativity, statistical variability, and choice of MPM integrator. New visualization methods are presented that provide insight into the material stress state around the penetration channel.