Presentation Agenda:
- Borehole Position Calculation Methods – “Where We Are & Have Been”
- Hole Condition “Shape” Indicators
- Dogleg / Severity
- Tortuosity
- Rugosity
- Borehole Position Calculation Methods – “Where We Are Going”
- High frequency surveys
- Computation Problems
- New Model Methods
Borehole Condition Indicators:
- Dogleg
- Lubinski – pipe bending
- Wilson – Tangential Method / Radius of Curvature
- Mason and Taylor – Minimum Curvature
- Tortuosity – Cumulative Dogleg – can be normalized
- Rugosity – Wellbore diameter irregularity
High Frequency Surveys
- Continuous Surveys – Gyro & MWD
- Gives better indication of the “true” shape of the well path
- Shows and corrects for “Stockhausen Effect”
- Short intervals can magnify angular changes when shown as rates, e.g. large DLS values
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Darren Aklestad