Wellbore Instability While Drilling Causes & Mitigation
Wellbore Instability Definition

Wellbore Instability

Wellbore or borehole instability is the undesirable condition of an open hole interval that does not maintain its gauge size and shape and/or its structural integrity. 

The Main Causes Of Well Bore Instability: 

- Unconsolidated Formation
- Overburden Stress / Mobile Formations
- Fractured Formation
- Naturally Over Pressured Shale
- Induced Over Pressured Shale
- Reactive Shale
- Tectonic Stress 

How Unconsolidated Formations Cause
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