Production of Oil and Gas shifts from easily accessible reservoirs to those which are located at greater depths, or in formations with complex geological history. These come with larger risks and hazards.

Geo-mechanical analysis of Oil & Gas reservoirs or wellbores is one of the specialties of DIANA as its extensive library of material models, element types and analysis functions are well suited for this purpose. These include:

  • non-linear material models for fracturing
  • shear-failure
  • creep and crushing of rock and frictional fault modelling
  • automatic meshing procedures for 3D formations starting from geological model data 
  • distributed pressure fields and material properties
  • anisotropic material models for up-scaling
  • automatic and user defined solutions procedures for nonlinear problems
  • thermal and flow-stress effects
  • efficient direct and iterative parallel-processing solvers 
  • powerful visualisation of models and results

DIANA will help to quantify rock-compaction, stress changes, fault slipping in reservoirs and overburden and surface subsidence as result of and related to production of oil and/or gas. DIANA can also be used on wellbore scale to quantify rock failure, casing deformations and cementing integrity during well completion, or operational conditions such as pressure or temperature shocks or fault sliding.

Furthermore, the program is structured such that all several different analyses can be performed in one analysis command sequence. 

In addition to the oil & gas specific technical data and specifications below, see also the general functionality information (to the right of this page).  Our range of brochures are also available for download.  Or, if you have a specific question about DIANA that you would like to ask, please use the webform.

DEDICATED FEATURES FOR OIL & GAS

Modelling features

  • Plane strain and 3D meshing procedures for elements with linear and higher order displacement interpolation
  • Plane strain and 3D interface elements for modelling sliding faults with frictional properties
  • Unstructured and structured mesh generation for 2D models.
  • Automatic 3D meshing, inclusive interface element-definition for faults, from geological data represented by triangulate surfaces of horizons and faults
  • Definition of materials and pore-pressure loadings as distributed properties


Material models


  • Mohr-Coulomb and Drucker-Prager plasticity with and without plastic hardening for shear failure of rock
  • Cam-clay and Modified Mohr-Coulomb model for combined shear and compression failure of soft rocks
  • Creep
  • Hoek-Brown and Jointed rock
  • Orthotropic elastic and elasto-plastic
  • Total strain and multi-directional crack
  • Coulomb friction in interface elements inclusive fault-opening


Analysis features

  • Stress initialisation with Ko procedures, inclusive calibration of plastic status of materials to initial stress condition
  • Automatic and manual load and time stepping
  • Heat-stress analysis
  • Staggered and fully coupled flow-stress analysis
  • Drained and undrained analysis
  • Effective parallel direct and iterative equation solvers

Modelling features

  • 2D and 3D meshing procedures
  • Wide range of element types, inclusive generalised plane-strain elements


Material models

  • Steel plasticity
  • Rock material models such as described above for analysis on reservoir scale
  • Concrete cracking and shrinkage
  • Nonlinear interface models for bonding / debonding of casing and cement
  • Visco-elasticity


Analysis features

  • Nonlinear stress analysis predicting integrity and failure of wellbore
  • Coupled and staggered heat-stress analysis
  • Open hole analysis
  • Transient analysis of creep and shrinkage effects