Forecast Wellbore Stability to Avoid Drilling-Related Failures
Most drilling-related failures are caused by unstable boreholes, whether these are caused by lost circulation, packoff, or stuck BHA and casing. The Schlumberger Geomechanics group pioneered a methodology to model and forecast borehole stability and to use this predrill knowledge in real time, enabling operators to minimize formation-related drilling problems. Real-time identification of wellbore instability, along with the mode of failure, is critical in correcting and reducing the cost associated with wellbore instability.
A wellbore stability forecast provides
- stable trajectory design
- optimal mud-weight definition
- maximum- and minimum-allowed equivalent circulating density (ECD) definition
- "solid ground" for casing seat selection
- swab and surge limit identification
- drilling parameters optimization
- preventative and remedial plan preparation.
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