STABView Software





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Summary of Features in STABView
To open a PDF file with the latest STABView brochure click here. To open a PDF file with the latest STABView technical features click here.
Types of Wells
  • Vertical, horizontal, or deviated wells
  • Offshore or onshore wells
  • Single or multiple zone analyses
  • Multi-branching wells *

Drilling Instability

  • Evaluate instability risks as function of ECD, EMW, BHP, SG mud density, over-or underbalance pressure
  • 3D linear elastic models
  • 2D elastoplastic models
  • 3D passive shear failure initiation (borehole ballooning)
  • Swab and surge pressure effects
  • Underbalanced drilling features
  • Calculate a mud density, EMW, ECD or bottomhole pressure required to achieve a tolerable instability risk, e.g., hole enlargement
  • Calculate wellbore instability risks for a specified mud density, ECD, EMW or bottomhole pressure
  • Calculate and display the drilling "mud weight window"
  • Thermo-elastic effects due to steady-state conductive heat transfer
  • Export a predicted profile of enlarged hole size for hydraulics optimization

Lost Circulation and Fracturing

  • 3D elastic tensile fracture criterion
  • Penetrating fluids (water, selected drilling and completion fluids)
  • Non-penetrating fluids (cement, some muds)
  • Thermo-elastic effects on fracture breakdown due to steady-state conductive or convective heat transfer
  • Analyze packer and sleeve induced fractures
  • Fracture toughness based breakdown criterion (after Morita)
  • Specify a critical fracture plugging aperture
  • 3D fracture link-up pressure *

Sand Production and Control

  • 2D elastoplastic models
  • 3D linear elastic models
  • Extent of horizontal well collapse (rubble fill percentage)
  • Near-wellbore skin can be used as an input parameter
  • Perforated, openhole, slotted liner, screen and expandable completions can be analyzed
  • Cylindrical or hemi-spherical perforation cavities
  • Input pressure drop across liners, screens and expandables
  • First-order estimate of isotropic loading on liners or screens
  • First-order estimate of borehole wall deformations.

In-situ Stresses

  • Biaxial stress state (2D models)
  • Triaxial stress state (3D models)
  • Correct stresses for reservoir pressure depletion or injection effects
  • Rotated principal stresses, e.g. salt, thrust fault stress regimes *
  • Future link to AG stress prediction software: ROCKStress™ *

Planes of Weakness, Faults and Natural Fractures

  • Account for the effects of ubiquitous, weak discontinuities on the risk of borehole collapse
  • Mohr-Coulomb failure criterion
  • Shear failure and slip tendency analysis for weak bedding planes, faults, natural fractures, cleats
  • Re-opening pressure analysis for weak bedding planes, faults, natural fractures, cleats

Pore Pressure and Capillarity

  • Steady-state pore pressure conditions (inflow or outflow)
  • Capillary threshold pressure for OBM and pseudo-OBM
  • Apparent capillary strength for weak sands
  • Filter cake efficiency model for permeable sandstones
  • Wall coating efficiency model for shales
  • Effect of an instantaneous BHP change
  • Fluid viscosity and permeability effects
  • Formation damage and skin effects
  • Steady-state non-Darcy flow effects for high rate gas wells and perforations
  • Compressible fluid effects in the near-wellbore area
  • Skin damage option for underbalanced drilling

Rock Failure Models

2D Elastoplastic Model
  • Strain-weakening Mohr-Coulomb
3D Elastic Models
  • Mohr-Coulomb
  • Modified Lade
  • Non-linear Hoek-Brown
  • Tensile fracture criteria
  • Passive shear failure initiation
Other Options
  • Biot or Terzaghi effective stress
  • Empirical hole size effects on effective rock strength *
  • Time-dependent  loss or gain of rock strength *

Borehole Stresses and Pressures
(As a function of radial distance)
3D Elastic Models

  • Principal stresses (s1, s2, s3)
  • Normal stresses (sq, sr, sz)
  • Shear stresses (trq, trz, tqz)
  • Pore pressure
2D Elastoplastic Models
  • Pore pressure
  • Normal and shear stresses

Borehole Deformations and Strains
2D Elastoplastic Model for Isotropic Stresses

  • Total strains
  • Plastic strains
  • Total radial displacements

Chemical Effects

  • Osmotic pressure model for clay inhibition effects based on shale and mud activities (API RP13 specification)
  • Handles many common oil-based and water-based drilling fluids
  • Database of published shale water activities and membrane efficiencies for a variety of shales and fluids
  • Drilling fluid activity calculator


Thermal Effects

  • Steady-state conductive or convective heat transfer effects on fracture breakdown pressure
  • Steady-state conductive heat transfer effects on 3D elastic borehole collapse risk
  • Time-dependent thawing and hydraulics model for permafrost

Calibration & Validation Options

  • Fix an acceptable BHP, drawdown pressure or mud density based on the performance of an offset well
  • User-defined borehole breakout angle criterion
  • Calibration options for borehole collapse and fracture breakdown
  • Automatic inversion of best-fit parameters from hole enlargement observed on caliper logs from offset wells *

Quantitative Risk Analysis *

  • Define input uncertainty with a variety of distributions
  • Include parameter correlations
  • Minimize simulation runs with optimized Monte Carlo methods
  • Additional output options in development


  • STABView case history database (optional)
  • Links to ROCKSBank™, AG’s worldwide rock mechanical and petrophysical properties database *
  • Links to ROCKStress™, AG’s in-situ stress database and calculator *
  • Auto-populate multi-zone analyses from external databases, e.g., Peloton’s WELLVIEW *

Reports and Graphics

  • Parameter sensitivity plots available for most stability models
  • Tornado plot for input parameter sensitivities
  • Scrollable "mud weight window" with re-scaling and zoom
  • Color polar contour plots for all 3D models
  • Export graphics to BMP and EMF file formats
  • Clipboard support for copying and pasting output graphics and text
  • Print to PDF and any Windows-supported device
  • Single or multi-zone input and output reports
  • Print preview capability
  • Well plan and profile plots with color-contoured BHP, EMW, mud density, drawdown pressure, or other parameters
  • Customizable color selection and pattern for lithologies
  • Compare yielding size for different rock failure criteria
  • New export file formats: JPG, GIF, RTF, XLS *

3D Wellbore Visualization

  • Visualize well survey in a rotatable 3D display
  • Display color-coded stratigraphic tops
  • Cross section of the casing profile may be shown
  • Color shaded wellbore for collapse or breakdown pressures
  • View principal stresses as a function of radial distance
  • Ability to move and position the view window as required
  • Set the scale of the displayed wellbore radius
  • No special 3D hardware required

Integration with Other Software

  • Export text or graphics files
  • Import well survey data
  • Cut and paste annular pressure data from wellbore hydraulics and multiphase flow modeling software
  • Run interactively with casing design, pore pressure, hydraulics and other wellbore design software *
  • Interactive data exchange capabilities *


  • US oilfield and SI units
  • High precision units for shallow wells and pipeline horizontal directional drilling (HDD)
  • Customizable mixed units


  • Right-click drop-down menus on all screen output
  • Solution algorithms optimized for rapid performance
  • Designed for graphical sensitivity analyses
  • Preferred user settings saved on exit
  • Ability to cancel calculations in progress
  • Run button to compute results as required

Operating Systems

  • Windows 2000/XP/Server 2003/Vista

Network/Deployment Options

  • Up to 3 PC installations for a single USB security key
  • LAN version available with one or more concurrent seats
  • Customized network configurations can be arranged

Help & Documentation

  • Real-time input data validation
  • Online Acrobat and hardcopy user manuals
  • Example files for all problem types
  • Comprehensive list of related publications
  • STABView case history collection (optional)
  • AG website and email support
  • AG newsletter “Geotechnology Views”
* New feature in development
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