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Offshore Drilling Operations

Offshore Drilling Operations. Jeff Bugden Canada-Newfoundland Offshore Petroleum Board. Outline. Project Management & Engineering Equipment and Systems Typical Offshore Drilling Program Operational Considerations. Atlantic Basins. TERRA NOVA FACILITIES CONCEPTUAL LAYOUT.

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Offshore Drilling Operations

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  1. Offshore Drilling Operations Jeff BugdenCanada-Newfoundland Offshore Petroleum Board

  2. Outline • Project Management & Engineering • Equipment and Systems • Typical Offshore Drilling Program • Operational Considerations

  3. Atlantic Basins

  4. TERRA NOVA FACILITIES CONCEPTUAL LAYOUT Source: Petro-Canada, 1997

  5. Ice Bergs

  6. Glory Holes

  7. Glory Holes - Dredging

  8. Terra Nova FPSO

  9. HIBERNIA PRODUCTION SYSTEM

  10. Drilling Installations

  11. Nomenclature • Sidetracking • MWD • BHA • Topdrive • LWD • Wellhead • Kick • CT • Fishing • Mudlogging • Xmas tree • Logging • BOP • KOP • SCSSV • MDT

  12. Part 1 - Project Management & Engineering Considerations • Drilling Installation • Well Design • Contracting and Procurement • Casing, Cementing, Drilling Fluids

  13. Power Requirements (hoisting equipment, mud pumps, rotary system) Geological Prospect (well depth, pressures) Rated Drilling Depth Environmental Factors (weather, ice, water depth, station keeping) Well Control Equipment Regulatory Requirements Pipe Handling Eqpt Solids Control Drilling Installation Drilling Installation

  14. Conceptual Well Design Geological Objectives Formation Pressures Well Design Evaluation Objectives “Problem” Zones Drilling Hazards Offset Well Data Time Estimate Cost Estimate $$ BUDGET $$

  15. Regulatory Requirements Casing Program Geological Objectives Overpressure Zones Casing Design Evaluation Objectives Fracture Pressures Testing Program Lost Circulation Zones Detailed Design (Burst, Collapse, Tensile, Wear, H2S) Grade, Weight, Connectors, Setting Depth

  16. Regulatory Requirements Cementing Program Temperatures Zone Isolation Cementing Fracture Pressures Well Abandonment Lost Circulation Zones Well Control Detailed Design Cement tops, recipes, slurry properties, additives, displacement rates, centralization, equipment & procedures

  17. Torque and Drag Drilling Fluids Program Wellbore Stability Equipment Compatibility Drilling Fluids Formation Protection Lost Circulation Zones Formation Evaluation Well Control Recommendations Type, desired physical and chemical properties, solids control requirements

  18. Directional Drilling Program Current Targets Faults Directional Program Future Targets Dip Formations Torque and Drag Recommendations Type of Curve, KOP, BUR, DOR, BHA, Directional Drilling Assembly, MWD Equipment

  19. Bit Program Lithology (well logs) Stickiness Bit Program Compressive Strength Offset Bit Records Abrasiveness Economics Recommendations Bit Types (Roller Cone or PDC), Hydraulics (Nozzles), Motor/Turbine Drilling, WOB, RPM

  20. PDC/Roller Cone Bits

  21. Part 2 - Equipment & Systems • Circulating System • Motion Compensation Equipment • Drilling Assembly • Hoisting System • Well Control System

  22. Motion Compensators

  23. Marine Riser

  24. Drilling Assembly

  25. Drawworks

  26. Crown Block

  27. Top Drive

  28. Drill Floor

  29. Iron Roughneck

  30. Mud Pumps

  31. Drillers Cabin

  32. Well Control System - BOP Stack

  33. BOP Control System

  34. Part 3 - Typical Drilling ProgramAssumptions:Semisubmersible Anchored 100 metre water depth

  35. Typical Drilling Program • Position rig. • Run Anchors. • Pretension mooring lines. • Survey seafloor with ROV.

  36. Typical Drilling Program • Run TGB. • Spud well. • Drill 36” (914mm) hole to 200 metres. • Run and cement 30” (762mm) conductor pipe with PGB and low pressure wellhead housing.

  37. Typical Drilling Program • Drill 26” (660mm) hole to 500 metres. • Run and cement 20” (508mm) surface casing with high pressure wellhead housing. • Run BOP stack and marine riser.

  38. Typical Drilling Program • Drill 17 1/2” (445mm) hole to 1,500 metres. • Run wireline logs. • Run and cement 13 3/8” (340mm) casing.

  39. Typical Drilling Program • Drill 12 1/4” (311mm) hole to 3,000 metres. • Core any hydrocarbon intervals • Run wireline logs. • Run and cement 9 5/8” (244mm) casing.

  40. Typical Drilling Program • Drill 8 1/2” (216mm) hole to 3,500 metres. • Core any hydrocarbon intervals • Run wireline logs. • Run and cement 7” (178mm) liner (if well is to be tested).

  41. Part 4 - Operational Considerations • Heavy Weather • Marine Forecasts • Operational Limits • Ice Bergs • T-Time • Ice Management

  42. Forecasts • Wind Speeds • Waves • Heave • Pitch and Roll

  43. WindSpeeds

  44. Heave

  45. Jeanne d’Arc Basin Operations - Floating Operations Manual Safe Operational Limits

  46. T-Time

  47. Ice Management

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