Developing a Slim-bore Wellhead & DT- HXT system for deep ... · Developing a Slim-bore Wellhead &...

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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GE©2008 All Rights Reserved

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



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



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"

#"



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



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.



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



DT W-Head Challenges

MS-1 Seal PR-2 & Damage Tolerant

Dual WB Retrieval (Tree & Csg Hngr)

Tooling Req, Test & Interfacing



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



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





Acknowledgements:B.Voss (Vetcogray)

M.Minassian (Vetcogray)

D.Benson (Vetcogray)

M.Starkey (Exxon Mobil)



Thank you for attending!

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