Weatherford Geomechanics Services

Weatherford Geomechanics Services

STABView

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STABView is a state-of-the-art commercial well planning software package for analyzing the risks of: Wellbore instability, Lost circulation and fracturing, Sand production and Fault, fracture or bedding plane slip. STABView will help you optimize the window of bottomhole pressure to drill, complete, stimulate and produce from vertical, deviated, and horizontal wells in all geological settings. This comprehensive software system was developed to set the standard for reliable, field-ready well designs.

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.

Drilling

  • 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.

Well Control

  • Assess near-wellbore stress and pore pressure conditions.
  • Evaluate hydraulic fracturing options to intersect a flowing well.

Formation Evaluation

  • 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.

Completions

  • 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.

Stimulations

  • 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.

Production

  • 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

Drilling Instability

  • 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.

In-Situ Stresses

  • 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
    • Mohr-Coulomb
    • Modified Lade
    • Mogi-Coulomb*
    • 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

Physico-Chemical Effects

  • 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

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 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.

Database Links

  • 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

Units

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

Functionality

  • 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

Operating Systems

  • 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

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