Decommissioning & Abandonment Engineering · decommissioning challenges. Uncertainties in asset...
Transcript of Decommissioning & Abandonment Engineering · decommissioning challenges. Uncertainties in asset...
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Decommissioning & Abandonment Engineering
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Key Services
Subsea & Platform Well Abandonment • Strength, fatigue and stability analysis of riser,
wellhead and conductor systems• Tensioning requirements of the conductor and
casing during plugging and abandonment• Vertical well loading assessment• Identification of maximum tubing pull loads• Engineering criticality assessment• Corroded and displaced well integrity assessment• Original well build simulation for in situ loads• Definition of allowable pressures for abandonment • Vessel drift-off limits and watch circle assessment• Jack-up rig modelling• Jack-up barge cantilever assessment• Component analysis of crossover tools and existing
connectors• Design of conductor strengthening systems
Lifting Analysis• Assessment of platforms, manifolds and flowlines• Design and analysis of lifting members and tools• Removal of concrete in piles• Procedure generation
Reverse Engineering• Reverse installation analysis of risers, flowlines and
moorings • Riserless abandonment system design• Cutting sequences• Selection of cutting tools• Operational procedures and storyboards• Execution of turnkey platform removal
Planning & Supervision Services • Data gathering and review of historic records • Cost comparisons and concept selection• Vessel selection and feasibility studies• Scrap yard selection• Offshore supervision
Other decommissioning services within the Acteon group include casing cutting/retrieval, marine procedure management, lifting and retrieval services, and design of abandonment programmes.
The end of an asset’s life can often present the most challenging technical situations that demand the best engineering solutions. 2H Offshore has engineering expertise and experience with platform wells, subsea wells, and infrastructure, to help solve your decommissioning challenges.
Uncertainties in asset data, changes in design approach and compromised structural integrity are just a few of the problems to be overcome. Our multi-disciplined team of experts will perform accurate risk based assessments of your asset to help bridge this gap and allow you to identify and mitigate potential concerns early in the project cycle.
Working closely with you and your equipment vendors, 2H will help solve decommissioning challenges such as the operation of modern, high specification vessels on obsolete wellhead designs, and loss of structural performance due to time-dependent degradation.
Our engineers have a thorough understanding of the safety philosophy of industry design codes and a practical knowledge of decommissioning operations gained from projects in the Gulf of Mexico, North Sea, Irish Sea and offshore Malaysia. This expertise enables us to ensure your decommissioning operations are conducted as safely and efficiently as possible.
Decommissioning & Abandonment Engineering
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PCPPOC – DANA Freestanding Conductor Platform AnalysisIn the DANA field, offshore Malaysia in 46m water depth, a LWS (Light Weight Structure) was connected to and laterally restrained by a MOPU (Mobile Offshore Production Unit). During decommissioning, the LWS was to be disconnected and left freestanding. 2H completed fatigue analysis of the freestanding LWS to identify the reduction in well loads required to allow the LWS to withstand environmental loading for sufficient time in the disconnected configuration. This allowed PCPPOC to plan abandonment operations in a way that avoided costly temporary strengthening works.
Chevron – Alder Suspended Well Plug and Abandonment Fatigue AnalysisThe Alder field is located in approximately 150m water depth in the central North Sea. 2H was contracted to assess fatigue accumulation in four previously suspended subsea wells. 2H worked closely with equipment vendors to ensure the fatigue performance of critical components was accurately captured and identified to Chevron the wells for which further fatigue mitigation strategies were required.
Project ExperiencePetrofac – Cendor MOPU Decommissioning & Conductor PreparationThe Cendor field is located offshore peninsular Malaysia in 63m of water. 2H was contracted to perform detailed engineering of retrofit structures, a bridge link and hook up arms on the platform topsides, to enable the well conductors to free-stand without buckling. This allowed the MOPU to be disconnected. 2H also provided installation engineering services to resolve the interfaces between the MOPU, the heavy lift vessel and the fixed platform.
Centrica Energy – F3-8 Well Plug and Abandonment from a Jack-upCentrica Energy was planning to conduct plug and abandonment operations on subsea vertical appraisal wells offshore Netherlands in 40m of water. 2H performed structural analysis of the operations due to concern over the capability of the installed conductor to withstand the stresses imparted from the tieback string. Three potential tieback configurations were considered with stability, strength and operability analysis carried out for each.
Interact – HRL Morecambe Bay Abandonment RiserHRL was planning to abandon an observation well in the Irish Sea in 35m of water using a jack-up rig. 2H performed strength and VIV fatigue analysis of the riser with and without being supported by slips at the drill floor. The analysis confirmed the acceptability of the drill pipe system proposed to be used for the abandonment operation.
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www.2hoffshore.com
Drilling, Completion & Workover
Production & Export
Marine drilling risers
Jack-up risers
Subsea well conductors
Completion & workover risers
Surface BOP drilling risers
FPS dry tree production risers
Fixed platform well conductors
Jack-up production risers
Steel catenary risers
Freestanding hybrid risers
Flexible risers
Umbilicals
2H Offshore is a global engineering contractor specialising in the design, structural analysis and integrity management of riser and conductor systems used in the drilling and production of offshore oil and gas. Our capability and experience covers all types of risers, from shallow water fixed platform conductors, to drilling and production risers used in ultra-deep water.
Areas of Expertise Our business falls into two primary categories, Drilling, Completion & Workover and Production & Export. Engineering of the risers used in each area of activity has many similarities in terms of the skill sets and experience required to conduct the work, but each area has many unique characteristics requiring specific experience and knowledge of the equipment and operations involved. The scope of each area of activity and overlaps that occur are illustrated below.
To find out more visit www.2hoffshore.com
About 2H Offshore