09 wellheads

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1

Wellheads

2

Wellheads

• Purpose• Comparison of Styles• Unocal Thailand Specifics

– National Kvaerner

2

3

Purpose of Wellheads

• Hydraulic isolation of annular spaces– Pressure integrity

• Controlled access to annular spaces– Flow control

• Structural support for BOP / trees

4

Weld on Casing WellheadsConventional Unihead

3

5

Install Blow Out Preventers

6

Install Test Plugs and Test BOP’s

4

7

Running Casing

8

Lift BOP to Install Slips Land Casing Hanger

5

9

Land Casing on Slips Pull Landing String

10

Cut Casing and LD Install Seal Assembly

6

11

ND Spool and DSA Test BOP

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Remove Spool and DSA Test Seal

7

13

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

14

• 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

8

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

16

• 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

9

17

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

18

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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