Evaluation of the production rate efficiency of the deformable oil reservoir using enhanced multiscale method

Petroleum reservoirs contain many physics that play role in multiple scales. Fluid flow and deformation of solid phase are main physics that influence the production rate. However, a full description of flow and deformation that includes all these scales exceeds the current computational capabilities. In order to overcome this deficiency, each physical effect should be treated separately on its area of influence. In the present paper, the fluid transport and deformation of porous media are determined through separate frameworks in different scales. The Enhanced Multiscale Multiphysics Mixed Geomechanical Model (EM3GM) have been developed and utilized to determine the production rate of deformable reservoirs. The EM3GM not only maintains advanced features of Multiscale Finite Volume (MSFV) in flow patterns but also improves with properties of Elastic-Plastic framework in the solid domain. Finally, in order to show the accuracy of the model and also to reveal the effect of the plastic deformations in production rate, indicative test cases were analyzed and reasonable results were achieved. The plastic deformation will lead to decrease in oil production rate with respect to energy loses during plastic deformation which is more close to the real situation. The numerical results show that neglecting solid deformation could overestimate the production rate from one to four times higher at the earlier stage of production for the hard rock and this amount would be increase for the loose rock with respect to higher energy loss.