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Wellbore Survey Simplified

This presentation demystifies petroleum engineering and provides an overview of wellbore surveying, including its history, importance, and future advancements. Sponsored by Shell UK Limited.

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Wellbore Survey Simplified

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  1. SPE Aberdeen Simplified Series 2014 Demystifying Petroleum Engineering Sponsored by Shell UK Limited Ross Lowdon June 4th 2014

  2. SPE Aberdeen Simplified Series 2014 Demystifying Petroleum Engineering WELLBORE SURVEY SIMPLIFIED Kindly Sponsored by Shell UK Limited Ross Lowdon June 4th 2014

  3. Agenda • Defining a survey • History of Wellbore surveying • Why do surveys matter? • Survey errors • Future of surveying

  4. What is a Survey? K-57 J-67 MD = length Of wellbore Along path I-67 G-67 E-57 D-57 A-67 TVD = Vertical depth Independent Of path C-67 M-66 O-66 P-76 P-56 P-66 K-66 J-66 D-66 Existing well Currently drilling Surface well location Wellbore trajectories Wellbore

  5. History of Wellbore surveying • Texas 1890’s • Next door “stealing oil” • “Prove it” • Jam Jar acid level

  6. History of Wellbore surveying • 1930 Photo Magnetic single shot • 1930 Photo Gyroscopic survey • 1980 Measurement While Drilling • 1999 Gyro While Drilling

  7. Survey Technologies • Magnetic • Robust and RT 5 second surveys • Poor reference • Affected by offset casing • Gyroscopic • Excellent Reference • Sensitive RT 2-7mins • Not affected by offset casing

  8. Why Does a Wellbore Survey Matter • Avoiding wells collisions • Avoiding well control issues • Relief wells • Ensure you hit the your targets • LWD to reservoir model tie in • Reserves estimates • Legal requirements

  9. The Value of Good Surveying Practice

  10. Avoiding other Wells • Well avoidance • Complex and contradictory data • Managing the survey data • Poor data quality/missing data • Survey Management • Ensuring data accuracy • Ensuring reserves estimates • Ensuring HSE

  11. Lateral MWD Survey Errors Main = Bm Crustal = Bc Disturbance = Bd • DS interference = Bds Total Magnetic Field = Bm+ Bc + Bd± Bds

  12. Improving Definition • BGGM 54 degree • HDGM 720 degree • MagVar 5,400 degree

  13. Capturing the Crustal FieldAeromag or Marine Aeromag schematic 3D mag cube

  14. Optimising Lateral Survey Accuracy • Advanced survey QC Local magnetic map • Multi-station correction IFR = 65% Lateral EOU reduction

  15. TVD Survey Errors • BHA misalignment • Mechanical and temperature pipe stretch • Survey frequency • Measurement error

  16. BHA Mis-alignment MWD sensor aligned with wellbore axis • What effect does it have? • <0.1°to 1.0°in inclination • 0 ftto 100+ ftof TVD • Stabilizer wear? Measured Actual Tilted MWD sensor from wellbore axis

  17. Mechanical and Temperature Stretch • Steel expands with temperature and stress • Pipe stretch • Vertical—TVD error • Horizontal—MD error • 1.3 m/1,000 m/100degC—thermal • Mechanical 1 m/1,000 m—force • Can be corrected

  18. Survey Frequency • What is happening between 90 ftsurveys? • Well placement issues • Reservoir modeling • Geo-steering • Log interpretation • Well engineering issues • Running casing • Completion flow modeling • ESP flow modeling

  19. Sensor Errors • Inclination measurements ±0.1º • Industry standard • Gyro tools same specification • Calibrated • Capable of higher accuracy

  20. TVD Optimisation—is the Accuracy Real?Case Study • Use RSS + MWD D&I • EMS used to confirm MWD • LWD proved TVD • Captured stabilizer wear • Saved appraisal well • 12 m TVD error at 12,5 km

  21. Future of Surveying • Combined magnetic and gyro tools • Real time inertial surveying • Hole curvature measurements • Autonomous drilling machines

  22. Questions?

  23. SPE Simplified Series Sponsored by Shell UK Limited NEXT SIMPLIFIED SERIES PRESENTATION • Simplified Series is held every firstWednesday of each calendar Month • Next Venue – Wednesday July 2, 2014 • Station Hotel Aberdeen (The Ballroom) • RusselMorrice North Sea Drilling Engineering Manager BP • Drilling Engineering Simplified

  24. SPE Aberdeen Simplified Series 2014 Demystifying Petroleum Engineering Organised by SPE Aberdeen Young Professionals Contact us: george.grangeon@reefsubsea.com or ross.taylor@maerskoil.com SPE Simplified Series Sponsored by Shell UK Limited

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