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PETE 406

PETE 406. Lesson 8 Offshore Drilling. Content. Inland barges (submersible) Jackup rigs Wildcats Shallow water templates Cantilevered over platform Platform rigs Floaters - semi’s and drillships. Inland barge. Used in swamps, bays, inland water, shallow offshore.

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PETE 406

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  1. PETE 406 Lesson 8 Offshore Drilling

  2. Content • Inland barges (submersible) • Jackup rigs • Wildcats • Shallow water templates • Cantilevered over platform • Platform rigs • Floaters - semi’s and drillships

  3. Inland barge • Used in swamps, bays, inland water, shallow offshore. • Floated and towed to location • On location these rigs are submerged • Well is drilled • Personnel and supplies are brought in by boat.

  4. Jackup rigs Noble Drilling’s Cecil ForbesA Jack-Up Rig

  5. Jackup rigs • Independent legs or mat supported • Some are self propelled to location, but most moved by tugs • On location survey boat surveys location

  6. Jackup rigs • Legs jacked down to sea floor • Hull picked up above water • Rig “pre-loaded” • Seawater pumped out • Jacked up to working “air gap” • Well drilled

  7. Jackup rigs • Used for both wildcat and development • Shallow water up to 350-400’ WD • Derrick may be fixed or cantilevered

  8. Platform rigs • Tendered

  9. Platform Rig • Self contained

  10. Platform Rig • Operations similar to land except: • Limited storage space • Crew lives on location • Cementing operations simpler

  11. Floating rigs • Semi-submersible • Drill ships

  12. Sonat’s George Washington A Semi-Submersible Rig

  13. Zapata’s TraderA Drillship

  14. Semi-submersible Marine Riser Subsea BOP stack

  15. Drilling from Floating Vessel • Rig move • Hole opener pulled from storage and prepared for use • Structural casing is measured and brought on deck • Inspect and test riser and BOP system

  16. Drilling from Floating Vessel • Water depth at new location verified • Tide tables obtained • Choke manifold inspected and tested • Site surveyed and marked with buoys

  17. Drilling from Floating Vessel • Anchor boats on location • Heading adjusted and anchor setting begins

  18. Drilling from Floating Vessel

  19. Drilling from Floating Vessel • Anchor lines tensioned

  20. Drilling from Floating Vessel • Well prepared for spudding • Temporary guide base (A) set • 36” Structural hole drilled to 80’ to 200’ BML • 30” Structural casing (B) run and cemented with permanent guide base (C) attached C B A

  21. k 26” Conductor hole drilled to approx. 1000’ BML Can be drilled with or without riser 20” conductor casing run and cemented.

  22. lling • Wellhead installed with conductor casing

  23. While WOC riser and stack are N/U and latched onto the wellhead Control pods

  24. Surface hole drilled to 3000’ to 5000’ BML Surface casing is run and cemented through riser and BOP’s

  25. Floating Drilling • Float collar drilled out and casing tested • Float shoe drilled out and 5’ to 15 feet of new formation drilled • Hole is circulated and conditioned • Casing seat is tested

  26. Intermediate hole drilled to just above target zone and logged Intermediate casing set, cemented and tested Intermediate casing drilled out Hole circulated and conditioned Casing seat tested

  27. Production hole drilled to TD and logged Production casing or liner run and cemented Well completed and tested

  28. Floating Drilling • After testing, hole prepared for abandonment • P&A, PNA • TA, T&A, TNA • Perfs squeezed, and cement plugs set according to regulatore rules and regulations

  29. Floating Drilling • Riser and BOP retreived • Casing cut approx. 10’ BML if PNA • Temporary and permanent guide base retrieved • Anchors pulled • Vessel under way to next location

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