IMR Best Practice - Practical Lessons from a Decade of

Subsea IM

John MacDonald & Dharmik Vadel

11 March 2015

Background

– Early 2000; applied design tools to look at integrity of SCR Strakes

– Expanded to cover all in-water equipment

Different Approach

– Engineering came first

– Use available data and management

– Typical engineering reports

– Wrapped the process around it all

Today’s Objective

– To look at some practical lessons from a decade of practice

Introduction

Plan

Do

Check

Act

Complex system – Straightforward Approach

Reporting and

Update

Integrity Plan

Execution Assess

and Respond

Documentation Strategy

Data gathering/ retention

Risk Assessment

IM Plan

Inspection procedures

KPIs

Life Extension

Corrosion Assessment

ROV GVI

Pipeline positioning, spanning

Strake cleaning

FlexJoint Inspection

Pod/Choke change out

CP survey

Specialty tooling

Integrity Management Inspection Repair Maintenance

Complex system – Simple Approach

This is an Engineering Function

– Risk Assessment

– Safety Case

– Prescriptive

Documented list of activities where each action confirms a barrier and no new hazards

Based on the intended design – access to design intent required!

Requires expertise of the system and relevant failure modes

Best completed at the end of the project phase

Plan Consulting &

Front EndDesign & Construct

Hook-Up & Commission

Operate Decommission / Divest

Front End consultancy

Greenfield Projects

Brownfield Projects

O&M Support

Late life management

IM Services • DFIO• IM process• Asset IM plan

• Baseline• As-built

• Risk Assessment• Inspection procedures• Inspection/support• KPIs• Direct assessment• IM Plan• Anomaly management• Life Extension• Corrosion• Defect Assessment• Maintenance• Repair management• IM Software• Specialty tools

• Records for ownership transfer

• Sale due diligence survey

GVI is cornerstone of most IM plans.

Approach:

– Understand what information is needed and how to get it

– Establish limits or guides before hand

Many of the threats are not visually understood

Inspection

Baseline Inspections

Baseline inspections identify when system deviates from design

Insulation

Pipeline

Field Joint

Baseline Inspections

0.17

0.175

0.18

0.185

0.19

0 1 2 3 4 5 6 7 8

Re

mai

nin

g W

T (i

nch

es)

Time (Yrs)

Time to Minimum WT

Nom WT, Min Loss Rate Nom WT, Avg Loss Rate Nom WT, Max Loss Rate

Min WT, Min Loss Rate Min WT, Avg Loss rate Min WT, Max Loss Rate

Manufacturer Specified minimum WT = 0.180"

Previously accpeted minimum WT = 0.172"

Nom WT

Min WT0.182

Baseline inspections improve MTTF calculations

Trending to Maintenance and Repair

More than video – data gathered allows remediation before extensive damage

Gain insight to system behavior with existing information

– Vessel re-positioning for fatigue

– GPS data to indicate mooring changes

Key Performance Indicators

250

300

350

400

450

500

550

Mo

ori

ng

Lin

k C

ou

nt

Date

Vessel Relocation Stations vs. Date(Mooring Link Counts)

Mooring 1 Mooring 2 Mooring 3 Mooring 4

Year 1 Year 2 Year 3

Station 1

Station 2 Station 3

Station 4 Station 4

Neutral Station

Combining the available data with numerical models adds another dimension

Combined KPI and modelling

bp Horn Mountain Development - TTR Post Analysis

WELLHEAD BENDING MODEL COMPARISON

N-S Direction - Riser B, Isidore Event

-40

-30

-20

-10

0

10

20

30

40

50

100 120 140 160 180 200 220 240 260 280 300

Time (sec)

Be

nd

ing

Mo

me

nt

(kip

s-f

t)

Measured Bending Stuck Analysis

Trending forward – Subsea Control System KPIs

Vehicle Data - ADR 79/01 & 79/02 (2006)

Internet of things

The future of offshore is moving subsea

– HIPPS

– Pumping

– Separation

– Seabed IOR/EOR

Big Data

The approach to Subsea IM should be straightforward.

Planning and execution requires architects and craftsmen.

Once below the waterline there is an increased reliance on data and condition monitoring.

Data and inspection combined are a powerful tool in support of maintenance and repair decisions.

The goal of IM is to facilitate confident decisions which ensure safe and efficient operations.

Conclusions

C&C Technilogies – “AUV Pipeline Inspection Webinar”; August 27th 2014 http://www.cctechnol.com/pipeline-inspection-webinar

Bredero Shaw – “ThermoFlo Polyurethane Thermal Insulation Systems”; Retrieved March 2015 from http://www.brederoshaw.com/solutions/offshore/fj_thermoflo.html

MMS 2008-022 “Effects of Subsea Processing on Deepwater Environments in the Gulf of Mexico”; Multiple Authors, May 2008

References