09 wellheads
DESCRIPTION
TRANSCRIPT
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Wellheads
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Wellheads
• Purpose• Comparison of Styles• Unocal Thailand Specifics
– National Kvaerner
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Purpose of Wellheads
• Hydraulic isolation of annular spaces– Pressure integrity
• Controlled access to annular spaces– Flow control
• Structural support for BOP / trees
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Weld on Casing WellheadsConventional Unihead
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5
Install Blow Out Preventers
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Install Test Plugs and Test BOP’s
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7
Running Casing
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Lift BOP to Install Slips Land Casing Hanger
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9
Land Casing on Slips Pull Landing String
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Cut Casing and LD Install Seal Assembly
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11
ND Spool and DSA Test BOP
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Remove Spool and DSA Test Seal
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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
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• 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
NU DSA Go Back to Drilling
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15
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
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• 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
Test BOP, then go back to drilling Go Back to Drilling
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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
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Unocal Thailand Wellhead System
19.18’
12.46’
7.62’
2.88’
• Project economic– Platform Size.– Cheaper system.
• Sale Opportunities– Turn around time from
Drilling to Production.
• Operational Ease– Drilling Operation.– Flow Line Installation &
Testing.– Simultaneous Operations– WSVC Operation.
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