Unique capabilities in STABView allow you to: calibrate your models to offset well observations; include all-important pore pressure, temperature and chemical effects; use realistic rock behavior; import and export to other programs, and more. Efficient, rapidly-converging algorithms are used in the software to solve the fundamental equations that govern the mechanical behavior of the near-wellbore area. STABView was developed in the last decade based on cutting-edge research performed in several universities and oil and gas research organizations.
Extensive online and written documentation is provided to guide the novice or experienced user. Weatherford also provides in-house training courses on rock mechanics, wellbore stability and sand production for drilling and completion personnel. A one-day STABView workshop, featuring many practical case histories, is also available.
- Optimize your well casing program.
- Select optimal drilling and completion fluids.
- Optimize mud chemistry to inhibit clay swelling.
- Avoid stuck pipe or coiled tubing.
- Reduce reaming and cleaning time.
- Avoid drillstring fatigue and failure.
- Reduce the risk of lost circulation.
- Improve directional control.
- Evaluate candidates for underbalanced and managed pressure drilling.
- Model hydraulics with realistic enlarged hole sizes.
- Interpret formation leak-off and in-situ stress tests.
- Predict borehole deformations or squeezing behavior.
- Predict borehole enlargement in permafrost zones.
- Assess near-wellbore stress and pore pressure conditions.
- Evaluate hydraulic fracturing options to intersect a flowing well.
- Avoid stuck or damaged DST and logging tools.
- Avoid log interpretation problems due to hole ellipticity.
- Avoid logging limitations in OBMs.
- Back-analyze in-situ stresses and pore pressures.
- Evaluate the most permeable natural fracture sets.
- Determine well candidates for barefoot completions.
- Reduce the need for cased and perforated completions.
- Evaluate expandable sand screen candidates.
- Avoid poor cement integrity.
- Eliminate the risk of fracturing away cement.
- Optimize your perforating program.
- Increase perforation penetration.
- Eliminate unnecessary sand control.
- Evaluate the need for a gravel pack in weak sandstone.
- Evaluate casing deformations or failures due to formation shearing.
- Design cavity completions for coalbed methane wells.
- Determine the maximum injection pressure for matrix stimulation.
- Evaluate the effects of hole trajectory on induced fractures.
- Assess the potential for linking up induced hydraulic fractures.
- Estimate the pressure required to re-open or cause slip on natural fractures and faults.
- Reduce undesirable sand production.
- Avoid openhole collapse under drawdown conditions.
- Optimize drawdown to avoid sand production from perforations.
- Reduce wellbore skin due to unnecessary sand control.
- Assess the loading on a liner due to sand deformations.
- Evaluate the risk of mechanical formation damage.
- Design to purposely collapse the formation and pack it around liners or screens.
- Optimize the performance of gas storage wells by reducing mechanical skin.
- Design for sand production in heavy oil reservoirs (CHOPS).
- Reduce water production from induced hydraulic fractures.
- Calculate the maximum waterflood injection pressure to avoid fracturing.
- Assess thermally-induced fracturing during waterflooding.
New And Novel Applications
- Design wells for greenhouse gas sequestration.
- Optimize horizontal directional drilling for pipelines.
- Evaluate slurry and solid waste injection options.
Types Of Wells
- Vertical, horizontal, or deviated wells
- Offshore or onshore wells
- Single or multiple zone analyses
- Multi-branching wells
- Evaluate instability risks as function of ECD, EMW, BHP, SG mud density, over-or underbalance pressures
- 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
- Predict a profile of enlarged hole sizes 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
- Calculate points of hydraulic fracture initiation and display on borehole cross-sections and polar plots
Sand Production and Control
- 2D elastoplastic models3D 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, screens or expandables
- First-order estimate of borehole wall deformations.
- Biaxial stress state (2D models)
- Triaxial stress state (3D models)
- Correct stresses for reservoir pressure depletion or injection effects
- New poroelastic stress models for different reservoir shapes
- Rotated principal stresses, e.g., salt intrusion, thrust fault stress regimes
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
- Display log-derived bedding planes, faults, natural fractures and cleats on polar plots*
Pore Pressure and Capillary
- Steady-state flow with pore pressure gradients into or out of the wellbore
- Capillary threshold pressure for OBMs and pseudo-OBMs
- Apparent capillary strength for weak, partially saturated 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
- Biot or Terzaghi effective stress
Rock Failure Models
- 2D Elastoplastic strain-weakening
- Mohr-Coulomb Model
- 3D Linear Elastic Models
- Modified Lade
- Non-linear Hoek-Brown
- Tensile fracture criteria
- Passive shear failure initiation
- Other Options:
- Time-dependent loss or gain of rock strength and elastic properties*
Borehole Stresses And Pressures
- (As A Function Of Radial Distance)
- 3D Linear 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
- Osmotic pressure model for reactive clay inhibition effects based on shale and mud activities (API RP13B 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
- 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 and 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
Quantitative Risk Analysis* (For 2009 Release)
- Define input uncertainty with a variety of statistical distributions
- Include parameter correlations
- Minimize simulation runs with optimized Monte Carlo methods
- Cumulative probability mud weight window display
- Cumulative probability of yielding displayed on a borehole cross-section
- Statistical input and output in convenient data analysis reports
Back Analysis Assistant* (For 2009 Release)
- Automatically back analyze and update a geomechanical model from observed hole enlargement on offset well caliper logs.
- Link to ROCKSBank, Weatherford Geomechanics Services worldwide rock mechanical and petrophysical properties database
- Link to the World Stress Map (Karlsruhe University)
Reports and Graphics
- Parameter sensitivity plots available for most stability and fracture models
- Tornado and spider plots for multiple input parameter sensitivities
- Scrollable 'mud weight window' with re-scaling and zoom
- Color contoured polar plots for all 3D collapse and fracture models
- Export graphics to BMP and EMF file formats
- Clipboard support for copying and pasting output graphics and text
- Print to 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, ECD, 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
- Import well surveys and display in plan, profile and 3D views
- Visualize well trajectories in a rotatable 3D display with zoom and pan capabilities
- Display color-coded stratigraphic tops
- Display casing and/or liner profiles
- 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 actual wells or wellbore hydraulics and multi-phase flow modeling software
- Run in parallel with casing design, pore pressure prediction, hydraulics and other wellbore design software
- 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 most screen output
- Solution algorithms optimized for rapid performance (most calculations in seconds)
- Designed to perform graphical sensitivity analyses
- Preferred user settings saved on exit
- Ability to cancel calculations in progress
- Run button to compute results only when required
- Toolbar buttons for most common tasks
- Windows 2000/XP/Server 2003/Vista
Network / Deployment Options
- Can license for up to 3 PCs for a single USB security key
- Network version available with one or more concurrent seats
- Customized network configurations
Help And Documentation
- Real-time input data validation
- Comprehensive online Adobe Acrobat and hard copy user manuals
- Example files for all problem types (17)
- Comprehensive list of related technical publications and references
- Website and email support