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Analyze Borehole Breakouts and Interpret Horizontal Stress Directions

Breakout Analysis

GEO Borehole BreakOut Analysis module analyzes hole diameter from a Four Arm caliper dataset and distinguishes overgauge and undergauge sections with respect to bit size.

Based on industry standard methods, it further identifies Breakout affected zones and differentiates these from Washout areas.

Displayed alongside interpreted lithology, judgements can be made on the lithology units causing borehole collapse.

Wellbore Stress Direction

Based on the caliper pad azimuth information, GEO calculates the BreakOut azimuths from both the caliper sets and interprets Minimum and Maximum Horizontal Stress directions (Shmin and SHMax).

GEO plots the interpreted stress azimuths in the form of rose diagrams to give a quick visualization and easy interpretation.

Calculation of Geomechanical Moduli

GEO provides the options to calculate synthetic Shear Sonic Slowness from Compressional Sonic Slowness based on various empirical relationships, which can be calibrated from offset wells.

With the set of equations defined in the module, GEO calculates various geomechanical parameters – Young’s modulus, Bulk modulus, Shear modulus, Poisson’s ratio, Cohesive strength, Friction coefficient and Uniaxial Compressive strength (UCS). These outputs can be calibrated with the laboratory measurements from cores, where available.

Benefits

  • Quickly identifies Breakout affected zones automatically and in real-time.
  • These logs can be also be used to constrain image log processing depths saving time and costs.
  • With the interpreted stress directions from Breakouts a regional Stress Map can be created or updated, which has further implications in future deviated/horizontal well planning and hydrofracturing.
  • Displaying Breakout analysis and computed Geomechanical moduli alongside lithology, various drilling parameters (ECD, Pump output, RPM etc.) yields a comprehensive platform for interpreting subsurface formations affected by Breakouts.
  • The display formats can be customized and integrated into standard well log templates in order to help leverage existing well data and extract maximum information to optimize the interpretation.
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