Overview:
- Theoretical analysis has demonstrated that well path calculation can be made based on dogleg severity DLS and well tool face WTF along well path
- Downhole bending tool face BTF complements bending moment BM in providing good estimates of dogleg severity and well tool face (build rate and walk rate)
– Measurements made close to bit t- Improved directional control - wellbore quality
– Optimized execution of special operations
High Dog-Leg Left Turns Avoiding Well Bore Collision
Bending Tool-face provides Rotary Steerable system with the close Azimuthal control. Drilling these Steering Challenges require the best possible well path with Rotary Steerable especially for (build & turn & flat turn wells) these demand close to the bit azimuthal control for well bore collision avoidance.
- Directional Drillers have included bending tool face BTF information in their real-time decision making processes
- Mostly qualitative use of BTF information to improve directional control in special situations
– Challenging wells with elevated risk of unwanted azimuth changes
– Casing exits, open hole sidetracks
– Redundancy in case of directional sensor failures
- More work necessary to use measurement in quantitative way
– Indicator for survey quality and frequency
– Derivation of interim survey stations w/ equations above e.g. in zones of magnetic interference
– Reduction of azimuthal uncertainty with independent measurements
- Downhole bending moment measurement provides good estimate of dogleg severity
– Direct estimate via bending stiffness
– Calculation via BHA model depending on BHA design
- Continuous DLS estimates provide insight into local hole geometry between survey stations including
– Local doglegs
– Hole spiraling
- DLS estimates complement directional data set
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James Hood - Baker Hughes