Numerical Simulation of Compaction and Subsidence Using ABAQUS

Abstract: The evaluation of reservoir compaction and surface subsidence induced by hydrocarbon production represents a critical concern to oil companies and government environmental agencies. In this paper, we present an approach to evaluate strain and deformations at reservoir scale by using ABAQUS, linked to the flow simulator used in Eni EP nonetheless, the geomechanical processes associated with the reservoir exploitation are also of primary interest, since they can affect the behaviour of the reservoir itself and cause environmental impact as a consequence of productive layer compaction and land subsidence. Then, the evaluation of reservoir compaction and surface subsidence induced by hydrocarbon production repr esents a critical concern to oil companies and government environmental agencies. Reservoir compaction may alter the rock permeability over time with a consequent reduction in well rates, a delay in reserves recovery and a decrease in ultimate recovery from compaction-drive reservoirs (Ostermeier, 1995). In this case, a reliable forecast of the compaction is required for an optimized management of reservoir productio n. Moreover, the accurate prediction of soil deformation is crucial for the design of casing and completion to avoid well failures induced by high levels of compaction (da Silva, 1990; Bruno, 1992). In addition, surface subsidence that may be induced by hydrocarbon production must be considered in the design of surface facilities or to prevent adverse environmental impact when the reservoir is located close to an area of ecological, historical or social significance.