Techlog Wellbore Stability

Generate 1D mechanical earth models, assess sand management concerns, and perform fracture stability analysis.

Overview

The Techlog Wellbore Stability module comprises mechanical earth model (1D-MEM) building, wellbore stability, sand management, and fracture stability computation.

Techlog Wellbore Stability showing pore pressure, breakout pressure, and breakdown pressure with the wellbore deviation and azimuth.

Mechanical core analysis data used to calibrate the static mechanical properties.

Pore, breakout, and breakdown pressures displayed with synthetic failure image obtained for a specified mud weight.

When the inclined stress option is chosen the user can bring in a full stress tensor from a 3D finite element simulation. The evaluation of stable and unstable fractures will work in exactly the same way as the principal stress workflow.

In Fracture Stability the user can choose between principal stress and inclined stress input. For inputs without available log data the input is automatically switched to an parameter. The option is available to run the computation considering the effect of depletion.

Input to fracture stability is a dip data set containing dip and azimuth of fractures and/or faults. If a dip data set exists in a well it will automatically populate the Dip Input tab. Additional fracture orientations can be added within the Dip Input tab as well as completely new Dip data sets.

Fracture stability provides a logview and stereonet plot output. In the logview the input data (log and fracture orientations) are displayed. The output of the algorithm use the evaluation of the Mohr-Coulomb failure criterion fore each fracture orientation. Green values display stable and red values display unstable orientations.

Applications

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.

Benefits

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.

Features

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