The Techlog Wellbore Stability module comprises mechanical earth model (1D-MEM) building, wellbore stability, sand management, and fracture stability computation. The 1D-MEM is the backbone of every geomechanical workflow for which it provides the stress field, pore pressure, and mechanical properties. Integrated stress analysis is available as part of the Geomechanics and Advanced Acoustics Suite to calibrate the stress field orientation and horizontal stress magnitudes from multiple measurements. The Techlog Wellbore Stability computation is used to calibrate your 1D-MEM using drilling events and borehole images. Techlog Wellbore Stability is fully real time, enabling updates on drilling-related geomechanical risks such as losses and stuck pipe. Sand management helps to predict the sanding potential of weakly consolidated reservoirs. This helps to optimize drawdown pressures and perforation sizes and orientations. Fracture stability is enabled for critical stress analysis to predict the contribution of discontinuities during production considering depletion and injection.


Mechanical Earth Model

  • Dynamic and static elastic property, Biot coefficient, UCS, and friction angle computation using industry standard correlations.
  • Horizontal stress magnitude computation using the poroelastic tectonic strain model.
  • Calibration of stress field orientation and magnitudes using integrated stress analysis.

Integrated Stress Analysis

  • Stress direction determination from borehole images and caliper measurements and dipole sonic anisotropy.
  • Automatic detection of breakouts, fault slips, and drilling key seats with ultrasonic images.
  • Stress magnitude, regime, and direction using shear radial profiles.
  • Multiwell analysis in vertical and deviated wells for stress direction and regime.
  • Direct link from the module to the World Stress Map database using Google Earth.

Techlog Wellbore Stability

  • Prediction of potential shear and tensile failures at the borehole walls, and the breakout and breakdown pressures.
  • Sensitivity analysis for the mud-weight window versus deviation and azimuth.
  • Computation of the mechanically stable mud-weight window.

Sand management

  • Uses standard 1D mechanical earth model inputs.
  • Evaluates the sanding risk for openhole and perforated wells as a function of depletion.
  • Analyzes over intervals or conducts single-depth sensitivity analysis for any input parameter.

Fracture stability

  • Delivers critical stress analysis on fractures and faults.
  • Creates and modifies dip data input with ease.
  • Provides principal and inclined stress input.
  • Displays results in the LogView log interpretation application, stereonets, histograms, and Mohr’s circle plots.

Training Courses

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WesternGeco offers a comprehensive training program to support users of the Petrel E&P Software Platform, WesternGeco plugins, and other software products.