helix performance profile helix well ops talisman

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Helix Performance Profile Helix Well Ops Talisman OBJECTIVE Helix Energy Solutions Group, Inc.’s well intervention subsidiary, Helix Well Ops (U.K.), was contracted by Talisman Energy Inc. to execute a series of well maintenance, production enhancement, and decommissioning workscopes on five different wells in the UKCS sector of the North Sea in the winter of 2012. Over the course of the 68-day operation, Helix Well Ops successfully performed the following tasks on Talisman fields: This map details the locations of the Talisman subsea wells worked on during the campaign. The MSV Seawell completed a multi-well campaign in early 2012 for Talisman Energy Inc. Quick Stats Highlander: Remedial subsurface safety valve operations Tartan: Well suspension and well integrity operations Enoch-South Wood: Three plug and abandonment (P&A) operations with wellhead removal Tweedsmuir: Pumping and scale-squeeze operations Claymore: Mechanical repair, well maintenance, and integrity operations

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Page 1: Helix Performance Profile Helix Well Ops Talisman

Helix Performance Profile

Helix Well Ops Talisman

o b j e c t i v e

Helix Energy Solutions Group, Inc.’s well intervention subsidiary, Helix Well Ops (U.K.), was

contracted by Talisman Energy Inc. to execute a series of well maintenance, production

enhancement, and decommissioning workscopes on five different wells in the UKCS sector

of the North Sea in the winter of 2012. Over the course of the 68-day operation, Helix

Well Ops successfully performed the following tasks on Talisman fields:

This map details the locations of the Talisman subsea wells worked on during the campaign.

The MSV Seawell completed a multi-well campaign in early 2012 for Talisman Energy Inc.

Quick Stats

Highlander: Remedial subsurface safety valve operations

Tartan: Well suspension and well integrity operations

Enoch-South Wood: Three plug and abandonment (P&A) operations with wellhead removal

Tweedsmuir: Pumping and scale-squeeze operations

Claymore: Mechanical repair, well maintenance, and integrity operations

Page 2: Helix Performance Profile Helix Well Ops Talisman

t e c H N o L o G Y

Helix Well Ops carried out the Talisman operations on the monohull intervention

vessel MSV Seawell due to her ability to support multiple work programs and transit

quickly between the different well sites in the program. Subsea, Helix Well Ops’

5-1⁄8” Subsea Intervention Lubricator (SIL) was used throughout the campaign to

facilitate tree and well access in smaller-bore installations. Due to the Tartan well

being a Horizontal Christmas Tree (HXT) rather than a Conventional (Deul-bore)

Christmas Tree, the larger 7-1⁄16” SIL was necessary for this well intervention

well-work, in order to access the well and plug and suspend the well safely.

o P e R At i o N S H i G H L i G H t S

Highlander Remedial Subsurface Safety Valve Operations

• 13.4 days in field

• Deployed and tested the Subsea Intervention Lubricator (SIL) in order to

conduct light well intervention

• Safety valve hold-open sleeve successfully installed, and

two contingency packers run

Results: The primary objective of setting a sleeve to hold-open the TRSCSSV was

successfully completed. However, due to an obstruction in the well, the secondary

objective of logging and re-perforating was aborted.

Tartan Well Suspension / Well Integrity Operations

• 15.4 days in the field

Results: Using slickline and e-line tooling, Well Ops successfully accessed the Tartan

well, set plugs and suspended the well with minimal downtime.

• Slickline set plug and prong set via slicking in the tailpipe nipple at 13,499ft

• Slickline set plug and prong in the TRSCSSV nipple at 662ft

• E-Line set ‘environmental’ Retrievable Bridge Plug (RBP) below the tubing

hanger at 450ft

Enoch/South Wood P&A Operations with Wellhead Removal

• 15 days in the field

• Rig up & deploy Well Abandonment Straddle Packer (WASP) tool c/w perforating guns

• Remove debris cap and clean tree cap hub

• Mix and pump cement plug into “A” Annulus & 9.625” Casing

• Pull & recover Wellhead to vessel

Results: Completed the permanent abandonment of 3 wells and temporary

and permanent guide-base recoveries.

h e l i x w e l l o p s t a l i s m a n

Seawell’s crew readying the IRS for deployment.

Page 3: Helix Performance Profile Helix Well Ops Talisman

Tweedsmuir: Pumping and Scale-squeeze Operations

• 7.5 days in the field

• Successfully spotted 1st stage of Chemical Dissolver soak

• Conducted survey work of Manifold during 1st stage

soak period

• Flush 1st stage and spot 2nd stage of Chemical Dissolver

• Pump Scale Squeeze treatment

• Flush 2nd stage of Chemical Dissolver

Results: Successfully carried out a scale squeeze of the TP1

well, along with a chemical dissolver soak of the Tweedsmuir

Production Manifold Multi-Phase Flow Meter (MPFM) and general

survey work of the manifold.

Claymore: Mechanical Repair, Well Maintenance, and Integrity Operations

• 14.9 days in the field

• Intervened well & confirmed well was sub-hydrostatic

• E-line & Archer Calliper run-in-hole (RIH) to obstruction / parted

tubing @ 4250ft – tubing integrity above the Hold Up Depth

(HUD) appeared intact

• Recovered redundant spool pieces

Results: Due to downhole problems it was not possible to install

barriers to allow the removal of the old tree. In-hole work

gathered essential information on the obstruction (parted tubing)

to allow Talisman to plan future operations. All spools were

successfully recovered.

c A M PA I G N S U M M A RY

Mobilization

• Five mobilizations in total

• Full demobilization of 51⁄8” SIL in order to mobilize

71⁄16” SIL for Tartan well

• P&A phase included full vessel demobilization of equipment to

accommodate key equipment for well abandonment

• A variety of Trees intervened through during the campaign:

Cameron; FMC and GE (Vetco)

• GE (Vetco) and Drill-Quip wellheads during P&A well-work

A recovered subsea tree on board the Seawell’s deck.

A subsea tree (below) connected to the Seawell’s IRS (above).

Page 4: Helix Performance Profile Helix Well Ops Talisman

www.HelixESG.com

US Tel 281.618.0400UK Tel 44.0.1224.351800Singapore Tel 65.6.501.0130

Well Work Completed

• 3 LWI (Well Maintenance & Production Enhancement)

• 3 wells P&A’d (Decommissioning)

• 1 well scale-squeeze treatment (Production Enhancement)

C O N C L U S I O N

Helix Well Ops (U.K.) successfully executed the cold weather (December to February) well campaign with a total uptime of 74.8 percent

(49.5 days) in water depths ranging from 90m – 141m. A variety of subsea well operations were carried out during the campaign

including three light-well intervention operations, three decommissioning operations and one well scale-squeeze treatment carried out

for production enhancement. Additionally, Helix Well Ops was able to access all of Talisman’s subsea wells which featured a variety of

Christmas trees including models fabricated by Cameron, FMC and GE (Vetco). These work scopes were supported with Saturation Diving

operations using the vessel’s onboard 18-man saturation diving complex. In the supplier performance survey completed at the end of the

campaign, the client reported excellent performance for service quality, management, planning and delivery.

h e l i x w e l l o p s t a l i s m a n