8 Keith Henning - Halliburton.pdf

8/10/2019 8 Keith Henning - Halliburton.pdf

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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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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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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



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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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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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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?

8 Keith Henning - Halliburton.pdf

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