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All communication to the reservoir is via the near wellbore and hence is influenced by near-wellbore effects – this should be understood and mitigated from being the weak link in production/injection.
Elfen wellbore encompasses all near wellbore applications such as; stress, stability and loss circulation, fines migration and mud-cake modelling, sanding analysis and prediction, sand screens and advanced completions systems design, near wellbore fracture and damage prediction. Also includes well string assessments captured from Elfen horizon output.
Accurate and safe wellbore design in challenging environments
Reduced downtime and effective drilling hazard mitigation
Understanding of completion system integrity limits and integrated design
Reduced number of injection wells
There has been significant debate over the exact mechanisms that allow the sand to be produced and whether the process creates a radial zone of high permeability around the wellbore or more linear high permeability channels (wormholes) out from the reservoir. Numerical modelling of the sand production process presents significant numerical challenges mainly because it is a highly-coupled nonlinear process and requires constitutive models that are able to capture the material instability.download paper
For simulations of the CHOPS process, the model shows that a key aspect of the process is the shifting of the overburden stress from parts of the reservoir sand that fail and are produced to those where the sand has not failed. It is this mechanism that allows wormholes to form in the numerical models. The models have also shown conditions which can be induced in the reservoir to enhance formation of wormholes. Automatic adaptive remeshing for TWC simulation (Rockfield, 2007)view all case studies
The foundation of this work was over 40 fracturing laboratory tests to measure fracture geometries for a range of well deviations, differential horizontal stresses and rock strength. The samples tested were from three outcrops with unconfined compressive strength (UCS) values ranging from 300-1000 psi. For boreholes having low deviation angles and small differential stresses a vertical single planar fracture became mode complex, with transverse turning fractures no longer aligned with the wellbore.download paper
These laboratory results were used to develop and calibrate a new fully-3D finite element model that predicts non-planar fracture growth, using the finite element code ELFEN. The model matches the details of the laboratory tests, including the transition from planar vertical to non-planar transverse fractures as the well deviation, azimuth and stress differentials increase.view all case studies