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Wellbore / Decommissioning

Well decommissioning is the final stage in the life-cycle of a well with lifespans typically ranging from 15 to 30 years.  

Elfen Wellbore can predict the open hole response within “creeping shale” layers accounting for excavation stresses, varying wellbore conditions and rate dependent material properties. The models can estimate the loads exerted onto casing allowing casing integrity assessment.

One notion which has accrued interest is utilising the natural barrier properties of shale in combination with the phenomena of shale creep.  Assessment of bond logs has indicated that the formation can fully close the annular gap between rock and casing.  Moreover, pressure tests have been shown to ratify suitable barrier properties.

Utilising our software, Elfen Wellbore can predict the open hole response within “creeping shale” layers accounting for excavation stresses, varying wellbore conditions and rate dependent material properties.  The models can estimate the loads exerted onto casing allowing casing integrity assessment. Similar models can be used to assess the wellbore stability through salt.

Evolution of Casing Stress due to Salt Creep

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Wellbore closure due to Creeping Salt

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Evolution of External Pressure due to Creeping Salt

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Potential Failure Mode due to Creeping Salt acting on Weak Casing

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Potential Failure Mode due to Creeping Salt acting on Weak Casing

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Predict the open hole response with layers accounting for excavation stresses.

Features and Benefits

  • Robust modelling of complex phenomena with simple, intuitive and fast UI
  • Suitable for addressing uncertainty span
  • Casing Integrity assessment including contact interface with formation
  • Barrier Assessment
  • Sophisticated material models capable of representing
  • Orthotropy
  • Poro-elasticity
  • Rate dependency (creep)

Our Software

A standalone software application comprising multiple modules to model the wellbore and near wellbore throughout the life-of-the-well.

Elfen Wellbore

Elfen Wellbore

Elfen Advanced provides a full understanding of the stress regime, deformation, seismogenic zone, particle size prediction and production profile that results from the excavation of open pits, long wall mines or sub-level caves.

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