Developing a Slim-bore Wellhead & DT-HXT system for deep-water installation savings.
K.BuckleUTC Bergen 5th Jun 08Session I (09:00 - 09:30)
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Rig Rates:Circa $450K/day
Deeper Water:Up-to 10,000 ft
Reduction of Installation TimeFunction of WD + Tripping
Saving ~ 2 Off DaysCirca $900K
System Incentives
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Maintain:Robustness of Existing SystemFamiliarisation of Equipment, Methods & Procedures
Multi Disciplinary Reviews:Drill Well On PaperRegular Client Reviews and Design InputUtilise What Works, Fix What Doesn’t Draw on Clients Experience & Knowledge
Qualification:Stringent PR-2 Temp/Pressure Cycles + Additional TestingActual System Components Utilised Full Scale Integration Design (IDT)Interface New and Existing Equipment
System Objectives
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Traditional Csg Program(Conductor + 3 Off Csg)
1. Open Water Drlg(36”/30”, 20” x 18-3/4”Hsg)
2. Install 18-3/4” BOP On Well Head
3. Drill 17-1/2” for 13-3/8” Csg
4. Drill 12-1/4” for 9-5/8”
5. Pull BOP
6. Install Tree
7. Reinstall BOP & Complete
System Installation/ArchitectureSlim Csg Program(Conductor + 2 Off Csg)
1. Open Water Drlg(36”/30”, 20” x 18-3/4”Hsg)
2. Install 18-3/4” BOP On HXT(Tree Off Crit. Path Activity)
3. Drill 12-1/4” for 9-5/8”(Thro Tree)
4. Complete Well
36/30"
20"
9-5/8"
#"
13-3/8"
36/30"
20"
9-5/8"
#"
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MS-700 SB W-Head & HT2 DT-HXT Sys
HP-Hsg, Casing Hanger & Annulus Seal
HT2 DT-HXT & Tubing Hanger System
Specifications & Features:
10,000 Psi System
1,000,000 lbs of Casing
12-1/4” Drift in WH
9.7” Min. ID for SCSSV
Install 10-3/4” Csg Thro Tree
Up to 1/2- Mlbf Prod Tbng + 10,000-Psi Above
13-1/2” Drift in Tree
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18-3/4” MS700
System Comparisons (HP-Hsg)18-3/4” Slim Bore MS700
Common Installation ToolingSame Pressure Rtg > 10,000 PsiCommon L.P-HousingFlow-by areas:• Standard – 16 sq. in.• Slimbore – 14 sq. in.
Pass Thru Drift:• Standard - 17-1/2 in.• Slimbore - 12-1/4 in.
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Slim Bore (HP-Hsg x 10-3/4” Csg Hngr)New 13-1/2” MS-1 & Contingency Seal
HP-Hsg Flow-by: 14 sq. in
Pass Thru Drift: 9.70” Min For SCSSV
New 13-5/8” Tooling Suite:Plug Tool: C/W Lead Impression FeaturePADPRT: Csg Latch & 5-Kpsi BOP ‘P’ Set SealSRT: Different Hyd Intensifier RatioMill & Flush: Same Design
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DT W-Head Challenges
MS-1 Seal PR-2 & Damage Tolerant
Dual WB Retrieval (Tree & Csg Hngr)
Tooling Req, Test & Interfacing
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18-3/4” Non DT-HXT
System Comparisons (HXT)18-3/4” DT-HXT
Common Features Installation & Test Tooling
Pressure Rtg > 10,000 Psi
MVB Internal Geom. (Above Load Shldr)
Tree Connector & Interfaces
Lockdown, Sealing & Annulus Flowby
Unique DT-HXT Features Nom 13-1/2” Drift WB & Isol Slv
(Std Tree 9-1/4” Bore Isol Slv)
High Strength Load Shoulder
Wellhead to Isol Slv Seal
DT-HXT Challenges
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Impact of 12-1/4” D-BIT Pass Thro
Maintaining MVB Load Shoulder Capacity
Orientation System & Capacity
Isolation Sleeve Connection & Sealing
Wear Bushing Geometry & Pressure Rating
Interface With Standard & SB MS700 Systems
Achieving AssuranceUp Front Feasibility Report
“Drill Well On Paper” Workshop
FMECA, Design Reviews, Qualification Testing
Full Scale Test & Interface of HXT Components
Full Scale Test & Interface of W-head and Tools
PVT of Tree & Wellhead Seals
Full Scale Integration Design Testing of Test Tree & Wellhead Sys.
Capture Lessons Learnt & Enhancements
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Acknowledgements:B.Voss (Vetcogray)
M.Minassian (Vetcogray)
D.Benson (Vetcogray)
M.Starkey (Exxon Mobil)
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Thank you for attending!
Questions?