Contents
- Background
- Description of analysis
- Examples of field results
- Conclusions
Background
- Tortuosity = any deviation from straight hole => analysis of geometric shape
- Large scale (wellbore) 100-1000m
- Medium scale (survey interval) 10-100m
- Small scale 1-10m
Medium and small scale tortuosity cause problems
- Consequences:
- Increased energy consumption
- Equipment failure
- Increased work-over frequency
- Loss of production
- Increased costs, reduced profit
Dogleg severity – not good enough
- No simple way to «upscale» from short to long intervals
Novel tortuosity processing
- Three output parameters, resolution >~1 ft
- Input: High resolution survey data
- Continuous gyro; interval ~1 ft
- Standard survey operation
- Standard conversion to position co-ordinates
- Single external parameter
- S = length of analysis window = length of equipment (physical device)
1. Tortuosity parameter: T
- S = along-hole distance = ΔMD analysis window L
- T = relative elongation = deviation from straight trajectory on length scale S
- L = straight line distance (end to end)
- T is typically within [0 … 0.001]
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Jon Bang, Onyemelem Jegbefume, Adrián Ledroz, Gyrodata Inc.
Jay Thompson, SandRidge Energy