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  • 1. Wellheads 1 Wellheads • Purpose • Comparison of Styles • Unocal Thailand Specifics – National Kvaerner 2
  • 2. Purpose of Wellheads • Hydraulic isolation of annular spaces – Pressure integrity • Controlled access to annular spaces – Flow control • Structural support for BOP / trees 3 Weld on Casing Wellheads Conventional Unihead 4
  • 3. Install Blow Out Preventers 5 Install Test Plugs and Test BOP’s 6
  • 4. Running Casing 7 Lift BOP to Install Slips Land Casing Hanger 8
  • 5. Land Casing on Slips Pull Landing String 9 Cut Casing and LD Install Seal Assembly 10
  • 6. ND Spool and DSA Test BOP 11 Remove Spool and DSA Test Seal 12
  • 7. NU Casing Spool Go Back to Drilling • No waiting on Cement • No Risk of Flow After Cementing • No ND / NU BOP • No Heavy Lifts • Fewer flange leaks • Saved ~24 hrs rig time 13 NU DSA Go Back to Drilling • No waiting on Cement • No Risk of Flow After Cementing • No ND / NU BOP • No Heavy Lifts • Fewer flange leaks • Saved ~24 hrs rig time 14
  • 8. NU BOP Go Back to Drilling • No waiting on Cement • No Risk of Flow After Cementing • No ND / NU BOP • No Heavy Lifts • Fewer flange leaks • Saved ~24 hrs rig time 15 Test BOP, then go back to drilling Go Back to Drilling • No waiting on Cement • No Risk of Flow After Cementing • No ND / NU BOP • No Heavy Lifts • Fewer flange leaks • Saved ~24 hrs rig time 16
  • 9. Unocal Thailand Wellhead System 9” 6.5 M Slimhole LST wellhead system: • 3 Strings Casing Design • For 9-5/8” x 7” or 6 5/8” or 5 ¾” x 2 7/8” or 3 ½” • 6,500 Psi WP • Integral CSG & TBG Hangers • Two 2 1/16” 6.5M Studded Valve • One DHSV Control Line 17 Unocal Thailand Wellhead System • Project economic – Platform Size. 19.18’ – Cheaper system. • Sale Opportunities 12.46’ – Turn around time from Drilling to Production. • Operational Ease – Drilling Operation. 7.62’ – Flow Line Installation & Testing. – Simultaneous Operations 2.88’ – WSVC Operation. 18
  • 10. Notes: __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________