Comprehensive Approach to In Integrity Assessment of f Critical - - PowerPoint PPT Presentation

Comprehensive Approach to In Integrity Assessment

• f

f Critical Structural Components with ASPIRE™

Payam Jamshidi, TWI Ltd Sebastian Hartmann, Innospection Ltd

22/01/2019 The ASPIRETM - Project is funded by the EU under the Horizon 2020 Framework Programme Slide 2

OVERVIEW

• Well conductor integrity challenges
• What is ASPIRETM ?
• Advanced well conductor inspection
• Assessment procedure
• Case study
• Conclusion

22/01/2019 The ASPIRETM - Project is funded by the EU under the Horizon 2020 Framework Programme Slide 3

• Offshore well bores consist of several concentric tubes
• The outermost well casing, the conductor, protects the inside casings from aggressive corrosion.
• The conductor should not leak, nor buckle or collapse under both axial load and bending moment

Well ll Conductors

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Past Conductor Failures

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Well Conductor In Integrity Management Challenges

• Ageing assets
• Missing documentation of the asset
• No or insufficient inspection data available
• Lack of advanced technology available for effective cleaning and inspection of vulnerable areas (i.e. splash

zone)

• Lack of advanced technology available for processing of the inspection date to provide a risk based condition

assessment of the asset

• Lack of assessment application that can be used on site while the inspection is ongoing allowing for

immediate decision making

• No means for easy planning of mitigation options (i.e. repair)

22/01/2019 6 The ASPIRETM - Project 760460 is funded by the EU under the Horizon 2020 Framework Programme

ASPIRETM stands for “Assess Strategy for Upstream Plant Inspection and Repair” and is a software package to integrate the collection, management and analysis of inspection data for the purpose of providing RBI and repair decision making for upstream assets. What ASPIRETM does :

• Incorporates a customisable probabilistic based algorithm to use advanced reliability

methods to assess failure scenarios for several types of non-standard geometries, loading, environment and operations.

• Links the assessment to input from advanced NDT to analyse the results seamlessly.
• Provides information about operational risk and remaining service life as an output.

What is is ASPIR IRETM

TM ?

22/01/2019 7 The ASPIRETM - Project 760460 is funded by the EU under the Horizon 2020 Framework Programme

System Set Up arrangement & Power Supply

DC Power Supply & Sensor Multiplexer IN: 110V AC OUT: max DC 40V – 36A Monitor & DVD Recorder Camera IN: 110V AC , ~ 150W MEC Computer Power : IN: 110V AC , Rated 130W OUT: ET Board Output DC 12V & DC 5V Deck Cable 20m Umbilical ~150m Scanner IN E-Magnet max DC 40V 36A Camera/Light DC 12-19V 2.5 Amp full density

Advanced In Inspection (M (MEC-MPS200+)

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• Operations
• Little pipe preparation needed (no couplant)
• Remote controlled deployment
• Includes a spray bar for marine growth cleaning based on high pressure jetting
• NDE key points
• up to 1.3” Wall Thickness, sensitive for isolated pit detection, sizing accuracy ≤ +/- 10%
• inspection through coatings (Neoprene etc.) & CRA layers (Monel, Inconel, TSA ) with the MEC technology
• also includes an array of UT probes for a simultaneous mapping of the remaining wall thickness (in addition

to MEC)

• inspection speed (net average run speed 0.25m – 0.5 m/sec)
• separate C-Scan corrosion mapping of near side & far side or merged
• Direct online data assessment & integrity assessing data set up
• Delivers wall thickness matrix data in a neutral format (i.e. csv files)

Magnetic Field Lines EC field

MEC-MPS200+ In Inspection Equipment

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• Riser / Caissons / Conductors
• Combined cleaning & inspection
• MEC & UT Technology combination
• Inspecting through coatings
• No operational interruptions
• RAT Deployment / remotely operated

Splash Zone

MEC-MPS200+ Spla lash Zone In Inspection

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WT matrix data to be used as input for an advanced integrity assessment Provided in open data format (i.e. as csv file)

WT Matrix Data used as In Input to Assessment

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• Purpose
• To demonstrate / document viability & integrity of each of conductors
• For next “x” years – Endorsement period – Time/Risk Based Inspection

period

• Avoiding any major repairs
• Process
• Review of available data
• Design analyses and engineering assessments
• Inspection scopes & results
• Operational history including incidents

Well Conductors

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• Design check of well conductors is a stability check based on international best practices:
• Petroleum and Natural Gas Industries, “Fixed Offshore Platform”, ISO-19902, 2007
• Institute of Petroleum, “Guideline for the Analysis of Jackup and Fixed Platform Well Conductor System”, 2001
• Design of Concentric Tubular Members, G. R. Imm, B. Stahl, Offshore Technology Conference, 1988.
• Design Methodology for Offshore Platform Conductors, B. Stahl, M. P. Baur, Offshore Technology Conference, 1980.
• Minimum Required Thickness (MRT) is the thickness below which the required cross

sectional area is not achieved and failure may occur

• Grouting in annulus of conductor and other internal casing/tubing will influence the MRT
• calculation. It will be in-conservative not to consider the effect of grouting.

Assessment Procedure

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In summary, design evaluation of conductors include:

• Determine the equivalent section of the conductor by the supports configuration.
• Determine the stiffness of the conductor based on effective length
• Calculation of the axial loads and bending moment
• Calculation of stress ratio

MRT calculation which is the critical thickness at which the stress ratio is equal to 1.0.

Assessment Procedure

Conductor Subjected to Axial, Internal and Bending Strength Check Stability Check Stress Buckling

Design of Concentric Tubular Members, G. R. Imm, B. Stahl, Offshore Technology Conference, 1988.

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Lo Loading

Axial Compression Pi:

• Axial load due to weight of conductor, internal casings etc.

Pe:

• Axial load at each elevation due to weight on top of the conductor

Pi & Pe

Mi & Me

Global Bending

Me:

• Bending moment due to environmental condition such as “100

year storm – Wave and current” calculated by SACS software Mi:

• Bending moment due to eccentricity of casings

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Remaining Lif ife Assessment

External Indication Internal Indication Segment 1 (Marine corrosion zone) Segment 2 (Splash zone) Segment 3 (Sea Water zone)

The retirement thickness required to meet the loading condition at each segment of the conductor Distribution of corrosion rate per segments based on thickness data or corrosion models

CR MRT t RL

i mm ) (

 

Averaged Minimum measured thickness from the SLOFEC results

Distribution of RL (per segment)

• The remaining time to

exceed the Probability of Failure (PoF) target will be considered as the risk based remaining life. Cumulative Distribution Function (CDF)

MEC Inspection Results

1 2 3 4 5

age Trd t CR

nom 



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Corrosion Rates

Marine Zone Splash Zone

Literature

Zones of corrosion for Steel Piling in Seawater

Source: F. L. LaQue, Marine Corrosion cause and Precention, P. 116, john Wiley & Sons, 1975. Reproduced by permission of The Electrochemical Society.

Current Study

According to HSE Research Report 016 - Guideline for use

• f statistics analysis of sample

inspection of corrosion

Estimated CR will be the 95% confidence limit

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Ris isk and Ris isk Based Remaining Lif ife

• Predictive target risk date

(RLI)

• Inspection frequency

determined

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Results per section of f conductors

5 5 4 4 3 3 2 2 1 1

Total of 98 sections from 25 conductors

9 2 2 Forcasted Risk In 7 Years Current Risk 1 1 2 2 2 2 15 22 25 4 2 3 25 28 33 1 1 5 1

A B C D E

CONSEQUENCE

Unmanned M anned or

Very Low Low Medium High Very High

1 0-6 Water Injection OP

0000 OP

0000 OP

0000 OP

0000 OH(1)<1 5000 OH(1)<1 5000 OH(1)>1 5000 OH(1)>1 5000

PROBABILITY

Very High

1 0-2

High

1 0-3

Medium

1 0-4

Low

1 0-5

Very Low

A B C D E

CONSEQUENCE

Unmanned M anned or

Very Low Low Medium High Very High

1 0-6 Water Injection OP

0000 OP

0000 OP

0000 OP

0000 OH(1)<1 5000 OH(1)<1 5000 OH(1)>1 5000 OH(1)>1 5000

PROBABILITY

Very High

1 0-2

High

1 0-3

Medium

1 0-4

Low

1 0-5

Very Low

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FEA to vali lidate

Proposed methodology:

Method 1: Applying a reduction strength factor. Method 2: Define distance criteria between two patches of corrosion

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ASPIR IRETM

TM Soft

ftware – Data Handling

ASPIRE - Assess Strategy for Upstream Plant Inspection and Repair

• Easy to use
• Produces assessment results by click of a button
• Allows visualisation of input data (i.e. wt matrices)
• Allows for arbitrary sets of input parameters to simulate different scenarios
• Allows managing all conductors forming part of the asset base

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Verification of f In Input

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Ris isk Assessment

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Probability of f Fail ilure aft fter Repair

Defect Repair patch Reduction in Probability of failure

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Conclusions and Summary ry

• ASPIRETM software package enables criticality assessment of conductors based on

the results from advanced inspection

• Based on a proven and transparent methodology for conductor integrity assessment
• Calculates Probability of Failure based on input from inspection data
• Helps determining Risk-Based Remaining Life of the Conductor
• Allows optimising re-inspection periods
• Helps prioritising repair work based on a risk ranking of different conductors

inspected

• ASPIRETM assessment can be done on site with the inspection results collected

22/01/2019 26 The ASPIRETM - Project 760460 is funded by the EU under the Horizon 2020 Framework Programme

Thanks for your attention. Any questions ?

About the Project Partners:

• Innospection: Service provider to the O&G industry for

advanced automated inspection

• TWI: one of Europe’s largest independent research &

technology organisations. Non-profit membership based non-profit organisation with 3,500 members from 60 countries.