Accelerating Coupled Dynamic Flow and Geomechanical Systems for Complex Reservoir Simulations

摘要

Coupled reservoir and geomechanical simulations are required to account accurately for pressure variations and induced stress changes during the Iifecycle of oil and gas fields. This understanding is critical for mitigating drilling and completion hazards and for predicting compaction or subsidence in reservoirs containing weak and fractured rocks. 3D full-field models with accurate rock and fluid properties have become increasingly possible due to advances in the hardware and software involved in determining property distribution. This has subsequently led to a rise in the size and complexity of the simulations and computational efforts. Typically, geomechanics simulations are computationally more expensive than reservoir simulations due to the grid size required to model a geomechanical problem. This paper introduces a new workflow based on the latest multiparallel high-resolution unstructured reservoir simulator coupled to a geomechanics simulator using enhanced linear solvers with advanced deflation algorithms A performance analysis reveals that the proposed coupled system is significantly faster than the existing workflow. The accelerated coupled system brings the solution of full 3D geomechanics problems within the reach of a wider community of engineers using laptop or desktop computers, enabling them to deliver answers to field problems faster and without the need to access high-end supercomputers.