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Technical Paper: Reservoir Geomechanics Study for Deepwater Field Identifies Ways to Maximize Reservoir Performance While Reducing Geomechanics Risks

Society: SPE
Paper Number: 160329
Presentation Date: 2012
 Download: Reservoir Geomechanics Study for Deepwater Field Identifies Ways to Maximize Reservoir Performance While Reducing Geomechanics Risks (1.89 MB PDF) Login | Register

 

Abstract

Several Petrobras fields in Campos Basin are soft sandstone with a large number of faults, which demands a careful reservoir geomechanics study in order to maximize their production and minimize geomechanical risks. Those risks are associated with compaction and/or dilation, subsidence and in special with fault reactivation due to water injection, which can lead to a connection between different layers and reservoirs. The object of this study is a faulted turbidity reservoir in Campos basin where a water injection project has started. The Mechanical Earth Model (MEM) was developed. It was identified that the planned injection pressure would increase the risks for fault reactivation, and recommendations for a safe water injection project was obtained. Special emphasis is on factors that may have enhanced leakage pathways at some point during injection, reducing its effectiveness and bringing other related risks. Reservoir performance and associated reservoir deformation was estimated. The predicted stress and strain changes that were induced by production/injection were used to assess the wellbore stability, faults reactivation potential, cap rock integrity and rock fracturing. Understanding of the various potential processes and being able to predict the field behavior are critical to the optimal management of the reservoir for maximum productivity and recovery.

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