Assessment of the geomechanical effects in a real reservoir

摘要

This paper presents a hydromechanical analysis of a real reservoir using two different simulators. The software ECLIPSE~? was chosen for reservoir simulation and the software Abaqus~? for stress analysis. A methodology was developed and implemented in a C++ code to solve the hydromechanical problem in a partially coupled manner. The methodology is proven to be very robust, since the results obtained are similar to fully coupled scheme (one phase flow). The finite element mesh for the stress problem and the finite difference grid for the flow problem are non-coincident. The resultant nodal forces of the pore pressure variation are interpolated to nodal points of the finite element mesh and the porosity and pseudo compressibility are interpolated back to grid-block of the finite difference grid. In each time step, the simulation advances only if the solution converges, i.e., the difference of the average pore pressure between two iterations is less than a specified tolerance. The finite element mesh is generated using a commercial pre-processor that allows the creation of complex geometries.