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Keith Henning, Marc Van Wonderen Halliburton
Jason Smith and Eric Ladbrook Shell EPE
12th SPE ICoTA European Well Intervention Round Table
Use of Mobile HWU in Multi-Platform Workover Operations in
the North Sea
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Introduction An HWU in the North Sea provided long-term workover
operations as an alternative to standard drilling
equipment and personnel.
Various challenges were encountered in facilitating themobile workover operation around five offshoreinstallations during 2005/6.
Show how the HWU was adapted to operate in two
operating environments through existing platformderrick packages and as a stand-alone towerencapsulated HWU.
Lessons learned from these operations.
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Why an HWU Was Considered
Economically more attractive Number of available drilling personnel limited
Eliminate the need to upgrade existing drilling rig
equipment
HWU could provide
Flexibility and mobility to adapt to each installation Specialist crews
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Planning and Preparation
Setting Up a Dedicated Project Team
A dedicated onshore and offshore team was identifiedto manage the HWU as it moved within the offshoreassets
Onshore
Offshore
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Planning and Preparation
The HWU :
1. Perform cleanup operations.2. Pull/run tubulars up to 9 5/8-in. casing.
3. Sufficient margins to perform any over-
pulls at depths of up to15,000 ft.4. Increase tripping speeds by working in
three weight modes: 200, 400, and
600K.
5. Provide a 20K ft/lbs. HWU rotating head.
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Planning and Preparation
Platform Surveys
Standalone or thru
Derrick.
Facilities available. Crane
Additions to Standard
HWU package
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Project team meetings
Installation of the HWU on the platform.
Installation of the completion components
Structural verification
HAZID
CWOP
Onshore trials Mobilization
Planning and Preparation
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Operational Challenges HWU rig-up environment
Two rig-up modes Tower rig-up
Available deck space
Skid & Pipe
Availability of crane Heavy crane lifts
Multiple lifts
Visual perception on arrival
Derrick rig-up
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Operational Challenges HWU rig-up environment
Two rig-up modes Tower rig-up
Derrick rig-up
BOPs below drill floor
HWU on drill floor Heavy lifts in confined space
Top Drive Tracks
HWU Basket level
Multiple lifts to assemble Escape Methods
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Operational Challenges HWU rig-up environment
Two rig-up modes Tower rig-up
Derrick rig-up
BOPs below drill floor
HWU on drill floor Heavy lifts in confined space
Top Drive Tracks
HWU Basket level
Multiple lifts to assemble Escape routes
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Operational Challenges Limited bed space
Crews multi-skill Personnel movements closely managed
Limited deck space
Up to 450m2 required (equipment + pipe) Sharing with platform activities
Shutdowns and Construction
Platform Electrical and Air
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Completion Design Challenges
Removal/install. of 13 5/8-in. hanger
Problem HWU Jack and Slip Window 11
Full Joint below Hanger
Solution
Cut below hanger & lay down
Fish tubing at surface
Install short joint for RIH
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Completion Design Challenges Install ASV
Problem
Wellbore ASV ~42 ft long.
HWUs 10-ft hydraulic jack cylinder stroke
Could not be deployed with crane
ASV had control line pre-installed Solution
Assy. had to be walked through the HWU
Used multiple points to set slips
Removed from 3 wells and installed into 2
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ASV assembly walked thru HWU
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Completion Design Challenges
Install Dual Hanger
Problem
2 3/8-in ASV on the short string for gasinjection.
Could not be installed into the std. 10ft
work window.
Solution The 10-ft HWU access window was
extended with 4-ft ext. legs
Stationary slip window bottom plate was
modified to 20 3/4-in. Final length let dual assemblies be tailed in
thru the work window
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Dual hanger trials
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Results of the Workover Program
Auk AA01 ESP workover with
HWU in derrick
30 36
Gannet GA10 Workover due to
tubing leak with HWU
in tower
36 40
Tern TA22 Well Intervention dueto tubing leak with
HWU in derrick
50 43
Brent Bravo
BB27
Workover due to
TRSSV failure with
HWU in tower
45 45
Brent Charlie
BC23
Workover due to
failed gas lift with
HWU in derrick
47 60
Activity Description Actual TimePlan Time
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Conclusions HWU program a successful alternative to drilling
pkgs.
HWU offered flexibility: mobile and adaptable to the
restrictions of each installation.
Dedicated project team onshore successful in
Liaising with various offshore platform teams.
Program benefited from keeping dedicated lead
offshore personnel.
HWU crews able to integrate into different
platform systems.
Twelve months without a reportable HSEincident.
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Questions?
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