MAKING DECOMMISSIONING . ?· decommissioning services platform well abandonment – rigless, rig-based…

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DUBAI

ClaxtonPO Box 262490Jebel Ali Free ZoneGate 5, South SideFZS1 AL05 Dubai

T: +971 4 8863540E: dubai@claxtonengineering.com

NORWAY

Claxtonc/o Finnestadgeilen 11, Building 18Dusavik Base, N - 4029StavangerNorway

T: +47 51 83 66 74E: norway@claxtonengineering.com

SINGAPORE

Claxton 107 Tuas South Avenue 8Offshore Marine Center637036 Singapore

T: +65 6705 5825 E: singapore@claxtonengineering.com

Learn more at:www.claxtonengineering.com Tel: +44 (0)1493 744500

UK HEAD OFFICE

ClaxtonBureside HouseNorth River RoadGreat YarmouthNorfolk, NR30 1TEUK

T: +44 (0) 1493 744500E: info@claxtonengineering.com

ABERDEEN

ClaxtonTern Place House, Tern PlaceBridge of DonAberdeenScotlandAB23 8JX

T: +44 (0) 1224 452371E: aberdeen@claxtonengineering.com

MAKINGDECOMMISSIONINGHAPPEN.Proven experience combined with world-class designand project delivery mean you can trust Claxton tomake your offshore decommissioning happen.

www.claxtonengineering.com@ClaxtonNews Claxton Engineering

CONTENTS

DECOMMISSIONING SERVICES 04

Platform well abandonment 08

Subsea well abandonment 10

Casing recovery 12

PRODUCTS

SABRE- Subsea Abrasive Cutting 14

SWAT- Suspended WellAbandonment Tool 16

Drilling and Pinning 18

Casing and conductor saws 20

CASE STUDIES 22

Jack-up boat well decommissioning 23

SABRE Abrasive Jet CuttingSystem used to abandon Camelot 24

One-stop decommissioning solution 26

Rising to the challenge of RiglessSlot Recovery 28

The worlds first Rigless PlatformWell Abandonment 30

OUR FULL RANGE OF SERVICES 31

MAKEITHAPPEN.

CLAXTON HAVECONTINUALLY INVESTEDIN OUR TEAM ANDPROPRIETARY TOOLINGWITH THE RESULT THATTODAY THE COMPANY HASCOMPLETED OVER 280CUTTING AND RECOVERYPROJECTS, OVER 85WELLS CUT AND OVER130 SUSPENDED WELLSABANDONED.

03

Decommissioning has become an integral part of theoffshore industry over the past few years as operatorsseek to reduce their asset stock and remain profitable atthe same time. To achieve this, its important that clientshave a reliable and expert supply chain to rely on forguidance and support.

Claxton has a long standing record working on decommissioning projectsaround the world and have invested in creating a portfolio of comprehensiveservices. Experienced in platform, subsea, rigless and vessel basedcampaigns, Claxton supports well decommissioning by providing risers,wellhead removal, conductor severance, well P&A and solutions to overcomeintegrity issues with platforms or ageing well infrastructure.

Our experience, coupled with extensive in-house tailored engineeringcapabilities and a proven record of managing successful projects, makesClaxton the confident choice for platform and subsea well abandonment.

The content of this guide shows how we have shaped a turnkeydecommissioning service that has already helped hundreds of operatorsand projects around the world achieve their desired outcomes.

Thank you for taking the time to read this brochure. We look forward tohelping with your decommissioning project very soon.

Robert LeggettDecommissioning Product Leader

02

YOUR PROJECT NEEDS TO DELIVER.

WELL MAKE ITHAPPEN.

RIG AND RIGLESS DECOMMISSIONING SERVICES

04 05

Operators are now under increasing pressure to reduce costsand the focus on decommissioning is that much greater. However, the scale of cost reduction required means lookingbeyond immediate short-term efficiencies and thinking morestrategically of ways to reduce costs in the long term.

Claxtons growing catalogue of success across the life of field, includingbeing involved in many of the original drilling projects in the North Seahas enabled us to provide a decommissioning capability that oftenexceeds those of much larger competitors.

Our well abandonment experience stretches back over 20 years and weperformed the worlds first rigless platform well abandonment campaignon the Esmond, Forbes and Gordon field in 1995.

With Claxtons extensive knowledge and experiences of welldecommissioning projects around the world, we define our uniqueoffering as one that considers best practice that can be applied atdifferent stages of the decommissioning process. We are also able todraw from interconnected disciplines from across the Acteon group ofcompanies and third party partnerships for specialist analysis work andmanufacturing/machining where required. This enables us to define afull service offering for projects on a case by case basis.

Claxton has grown significantly over the years in order to respond to ourclients operating needs. The companys integration strategy means wecan offer comprehensive decommissioning packages to our clients forthe following applications:

Platform Wells (Rigless, Rig-based or combined SIMOPS) Subsea Wells Casing Recovery (Drilling Support Operations).

As well as describing some of the decommissioning projects Claxtonhave been involved in, this guide will give you a summary of theprocesses and procedures we can offer to abandon your wells reliably,successfully and safely.

06

DECOMMISSIONINGSERVICES

07

CLAXTONS TOOLS ANDPROCESSES HAVE DEFINEDRIGLESS AND RIG-BASEDDECOMMISSIONING ANDHAVE A PROVEN RECORD.

DECOMMISSIONING SERVICES

PLATFORM WELLABANDONMENT RIGLESS, RIG-BASEDOR COMBINEDSIMOPS

08 09

PLATFORM WELLABANDONMENT - RIGLESS, RIG-BASED ORCOMBINED SIMOPSFor platform well abandonments, wecan deploy our innovative range ofequipment along with providing ourexpertise in abandonment planning,P&A of the well and full recovery inorder to support you throughout thewhole lifetime of your project.

Claxton have built an enviable reputationin providing a rapid response tocustomers needs - whilst alwaysseeking best practice solutions in themost cost effective and safe way.Our ability to combine our large rentalinventory with a fast-track design-analyse-build engineering service meanswere often uniquely placed to respondquickly and responsively.

Operators Phase Claxton offers

Project Planning We provide a collaborative approach using our experience toidentify potential problems and offer ideas and solutions toovercome these

Guide obstruction removal Centralizer removal Review of available/existing information Review of well structural Integrity issues Review of the platform structural integrity issues Review the wellhead infrastructure Review of available facility services Surveys Feasibility study of recovery options Interface review and planning Development of procedures Design analysis and bespoke engineering Project management Plan critical path activities Establish P&A Programme and execution methodology.

P&A of the Well Wellhead preparation services and deconstruction Flushing and stinging services Integrity testing On-site machining Xmas Tree removal Hot bolting Supply of risers and the wellhead/B.O.P interfaces Riser tensioning (tension rings and tension systems) Platform SWAT to enable setting of well barriers Tubing severance and removal Camera system for well inspection Supply of Wellhead Jewellery for cementing services.

Recovery Installation of the appropriate recovery system Guide obstruction and centralizer removal Downhole severance:SABRE AWJCS (abrasive water jet cutting system), diamondwire, hydraulic cutting tools, mechanical cutting

Cut verification Surface severance and conductor recovery (single or

multi-string):Drilling & pinning, lifting tools and bespoke lifting devices,bandsaws, conductor/riser handling, marine growth removal,cut joint preparation for safe backload operations

Installation of deck hatch covers to make well slots safe.

Operators Phase Claxton offers

Project Planning We provide a collaborative approach using our experience to identify potential problems and offer ideas and solutions toovercome these

Review of available information

Vessel based surveys and tooling to enable informationgathering (TACRT - Temporary Abandonment Cap Retrieval Tool, camera systems)

Review of well structural integrity issues

Review of the wellhead infrastructure and over-trawlable structures

Bespoke wellhead tooling

Riser and structural analysis

Riser design and selection

Feasibility review of recovery options

Interface review and planning

Development of procedures

Design analysis and bespoke engineering

Project management

Establish P&A programme and execution methodology.

P&A of the Well Supply means of interfacing to the wellhead: Hydraulic connector for the wellhead and Xmas TreeConnector control systems and umbilicals IWOCS(Intervention Workover Control Systems)

Supply of riser systems:To suit 18.34" or 13.58" wellhead systems, 7" intervention riser,VIV (Vortex Induced Vibration) management

Riser tensioning (tension rings and tension systems)

TACRT - Temporary Abandonment Cap Retrieval Tool and LPP - Low Pressure Packer for mudline wells

SWAT Suspended Well Abandonment Tool

Through riser cementing optimisation.

Recovery Recovery of the wellhead using bespoke wellheadrecovery tool

Wellhead and tree lift tools

Subsea drilling & pinning

Severance:SABRE AWJCS (abrasive water jet cutting system),diamond wire, mechanical cutting, and cut verification.

DECOMMISSIONING SERVICES

SUBSEA WELLABANDONMENT

1110

SUBSEA WELLABANDONMENTSubsea we