Clarus @ OTC 2018

Clarus' Yohanna Ruocco will be presenting at the Offshore Technology Conference in Houston this year. The conference takes place from 30th April - 3rd May at NRG Park in Houston. 

Risk-Based Internal Corrosion Assessment of Pipe in Pipe Flowline - Monday, 30th April - 9.30am

Authors: Y. Ruocco, D. VADEL, Clarus Subsea Integrity Inc; P.T. Hogelin, J.T. Webb, Noble Energy Inc; R. Hill, Microalloying International Inc.



Safety and protection of the environment are paramount to successful, effective operations. A prominent challenge in the offshore oil and gas industry is striking a balance between maximizing production from a field and managing risks to meet or exceed regulatory compliance and safety goals. Noble Energy currently manages the integrity of its Gulf of Mexico deepwater assets through implementation of a risk-based integrity management (IM) program.  The objective of this paper is to demonstrate the value of a risk-based assessment process to mitigate internal corrosion of a pipe-in-pipe (PIP) flowline by progressively advancing detailed engineering assessments from routine monitoring activities. The results improved understanding of the risk and allowed for an update to the IM plan for remaining service life.

As part of Noble Energy’s subsea IM program, annual asset risk assessments are conducted to identify, assess and control operational risks. Key Performance Indicators (KPIs) have been implemented to manage degradation mechanisms during design review and flag potentially unfavorable operational conditions. The exceedance of a KPI limit and the reliability of monitoring data directly affect the predictability of the associated degradation mechanisms. Elevated corrosion rates from a conservative corrosion model, combined with discrepancies in topsides corrosion coupon sampling, resulted in lower confidence for threat predictability. This prompted a more detailed assessment to confirm integrity of the flowline. The assessment included a review of design and historical monitoring data. A complete produced water analysis was executed to update the corrosion model. A flow regime analysis was conducted to assess the pipeline water-wet condition and water hold-up potential for current operational conditions.

This paper presents challenges and assumptions utilized in identifying representative load cases from a 10-year operational history. The result of the assessment was the identification of areas along the flowline with medium to high water-wetting risk and understanding of the hazards associated with internal corrosion at the identified locations. This study provided significant improvement in visibility of internal corrosion risk of the flowline. Path forward included considerations of performing an evaluation for scale formation and its tendency to act as a natural inhibitor against corrosion, refining the corrosion model, measuring wall thickness of the flowlines at areas of highest corrosion risks, and injecting corrosion inhibitor.

This paper presents a holistic approach to managing internal corrosion risks for subsea flowlines. It demonstrates the value of linking data to degradation mechanisms to improve understanding of risks on the assets and the value of a structured program to ensure an Operator makes informed and confident decisions.  

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Clarus @ NACE Corrosion Risk Management Conference

Clarus' Vinayak Patil will be presenting at the NACE Corrosion Risk Management Conference in Houston next week. The conference takes place from 23rd - 25th May at the Houston Marriott Westchase. 

Risk Assessment Tool for Corrosion Management – A Boon or Burden? - Vinayak Patil & Dharmik Vadel

Wednesday, 25th May 2016 - 11.35am


A risk assessment is a common tool employed by Operators during different stages of an asset’s life cycle, and can be used to varying degrees of depth and detail. With newer oil and gas fields being developed in deeper water and harsher operating conditions corrosion management has become a growing challenge. In case of brown fields, extending life of existing fields by addition of new wells poses its own unique challenge for demonstrating fitness for purpose. A well implemented risk assessment should allow identification, review of operational conditions, and mitigation of credible corrosion degradation mechanisms to prevent any catastrophic failures. However, there are challenges in the application of risk assessments and translation of results into a robust plan for active management and continual improvement of ongoing corrosion management based on results of inspection and monitoring activities.

This paper discusses lessons from a decade of risk assessment application in effective corrosion risk management for offshore oil and gas fields.  Case studies will be presented to demonstrate effective use of risk assessment to support the ability to manage human involvement factor, risk management strategy updates to support changes in operational parameters, and chemicals management with respect to incompatibility of chemicals and role of monitoring. Finally, a few recommendations will be offered with an aim to evaluate and improve existing corrosion risk management practices through effective us of risk assessment as a tool for Operators. 

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Clarus Hosts Life Extension Seminar

Clarus hosted the latest Acteon Group knowledge sharing seminar on Thursday 12th November in Houston. The event focused on offshore asset life extension and featured some great presentations from sister companies Intermoor, Pulse and Seatronics. Clarus VP John MacDonald also presented. 

The four Acteon group operating companies have successfully enabled life extension for a diverse range of offshore assets around the world. Their technical experts shared their thoughts on the challenges and emerging trends in the fields of life extension and integrity management, and an operator shared lessons learned from one of their offshore projects. 

The technical and networking event attracted participants from a range of Gulf of Mexico operators, and highlighted multiple examples of unique, cost effective and successful approaches to life extension. 

If you are interested in seeing any of these presentations, or to register for future technical events, please get in touch


Condition Assessment in Life Extension
Presented by John MacDonald, VP, Clarus Subsea Integrity
An overview on the existing and emerging technology in today's market available for condition assessment. Maturity and applicability of different methods will be reviewed along with suggestions for ways technology and engineering assessment can be used to increase confidence in life extension.

BP Wet Spool Monitoring System
Presented by JD Lan, Pipeline Integrity Engineer, BP 
A BP case study of a structural monitoring system to measure fatigue damage of a Wet Spool riser system. The monitoring data is used to assess and verify the integrity of the wet spool system for the life of field.

Autonomous Ship Hull Inspection with the Hybrid Predator/HAUV
Presented by Alistair Coutts, Senior VP, USA Region, Seatronics
An overview of how Bluefin and Seatronics are partnering to integrate the HAUV's autonomous ship hull inspection capability into the Predator ROV to create a powerful new tool for UnderWater Inspection in-Lieu of Drydocking.

Zafiro Mooring Replacement for Life Extension 
Presented by Jim Macklin, VP Engineering & Projects, InterMoor
An case study on how careful recovery, replacement, testing and inspection have allowed for recertification of the 20-year mooring system of an FPSO, without any interruption of its operations.

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Subsea Integrity Conference 2015

Clarus was bronze sponsor for this year's Subsea Integrity Conference in Houston. VP Dharmik Vadel presented in the Brownfield IM session. View his presentation entitled A Logical Path to Life Extension in our technical paper section here:

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Global FPSO Forum 2015

Clarus VP, Dharmik Vadel, presented at the Global FPSO Forum in Galveston this week. His presentation 'A Logical Path to Life Extension' can be viewed here:

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Clarus @ OMAE 2015

Clarus will present a paper at OMAE 2015 with sister company Intermoor on the Global Benefits and Operational Challenges of Vessel Relocation. OMAE 2015 is ASME's 34th International Conference on Ocean, Offshore and Arctic Engineering and will take place in St John's, Newfoundland, Canada from May 31 until June 5, 2015.


Movement of moored floating production vessels, such as Spars, Semi-submersibles, Deep Draft Floaters and Floating Production Units, due to environmental loading is often considered a design challenge that needs to be addressed during the design phase of a structure.  Proactive vessel relocation through mooring line adjustment can be integrated as part of an operational method to improve and extend component lives. This method may be implemented during the initially planned life of the structure to overcome riser fatigue life challenges, or as one of the methods to extend service life. The benefits are particularly noteworthy for steel catenary risers and mooring systems and have been discussed in previous works.  However, vessels often deviate from the original relocation plan in practice.  This paper assesses the benefits of a vessel relocation program with conscientious focus on the associated operational challenges.  Risks associated with vessel relocation are also investigated.  Suggestions are made to optimize such a program and to minimize interruption to production.

Open full technical paper.

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Clarus Subsea Integrity, Inc.
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Houston, TX 77079

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