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→Hole instability
* Overburden pressure
* Overburden pressure
* Earth movement forces
* Earth movement forces
* Pore pressure
* [http://www.glossary.oilfield.slb.com/en/Terms/p/pore_pressure.aspx Pore pressure]
* Water absorption, swelling, or dispersion
* Water absorption, swelling, or dispersion
* Ineffective hole cleaning
* Ineffective hole cleaning
* Stuck pipe
* Stuck pipe
* Bridges and fill-up
* [http://www.glossary.oilfield.slb.com/en/Terms/b/bridge.aspx Bridges] and fill-up
* Wellbore enlargement
* Wellbore enlargement
* Increased mud volume
* Increased mud volume