Combine capabilities and maximize insights with geomechanics
Ithaca Energy and Schlumberger collaborated to plan and execute the well injector. The model was based on an integration strategy in which Schlumberger would perform project management, carry out engineering work, and manage all services, including contracting Subsea 7 to lay pipeline, umbilicals, and risers for final hookup to the FPSO. Ithaca Energy provided wellsite supervision, the semisubmersible, transportation, and onshore waste management.
As part of the technical preparation during the planning phase, a detailed 3D geomechanics study was performed using Petrel Geomechanics and VISAGE simulator. This study was based on new core data, a recent reservoir simulation model, and seismic cubes provided by Ithaca Energy. The new geomechanics model helped illuminate rock properties and characterize subsurface stresses to enable designing the optimal drilling fluid for each section. The 3D geomechanics model also supported Ithaca Energy’s completion design, investigating possible occurrence of solid production (sanding) and screening unwanted water-weakening effects during injection.
Schlumberger also used the model to estimate reservoir depletion levels and select an adequate injection target. Several lab tests and OPTI-STRESS* wellbore stability software simulations were performed to optimize the best mud formulation required for wellbore strengthening and loss circulation.
Surpass production estimates with minimized risk
Schlumberger carefully mitigated uncertainties related to reservoir depletion. In cooperation with Ithaca Energy, Schlumberger carried out due diligence and calibrated the risk for both companies to ensure successful project execution. The completion design unlocked the possibility to perform the injectivity test before handing over the well to operations.
A maximum planned injection rate was achieved and sustained during the required timeframe. Ithaca Energy hooked up the injector well and began injection in October 2019. Since then, successful injection has continued, and Ithaca Energy exceeded its expected production results.