Survey Operations Pipeline Inspection

Transcription

1 Survey Operations Pipeline Inspection Hydrofest Prepared by Maria Papadopoulou

2 Agenda Definition of pipeline Why inspect? Regulations The IMR cycle How to Data Acquisition Data Processing Reporting The future Conclusions The most important thing Q/A (References) slide 2

3 Definition of pipeline Riser: Connects platform to sealine via a spoolpiece Landfall: The part of the export pipeline in the inshore zone Sealine: The export pipeline connects riser / spoolpiece to processing facilities ashore slide 3

4 Risers Risers can degrade rapidly due to Instability Current Wave Action Corrosion - electrical & chemical Wave Action / Movement Impact slide 4 Inspection options: Above sea level - RATS Splash Zone - RATS / divers Subsea - DP Vessel & ROV s Subsea - Platform based ROV s

5 Sealine North Sea: 20,000+km pipeline = Linear features Pipelines: gas & oil & water Umbilicals - electric, hydraulic, chemical elements. Cables - electrical & fibre optic Multifunction pipeline bundles Main Types of Inspection : GI = Acoustic sensors GVI = Visual sensors At risk from: Anchors & Trawl gear Instability Current & Wave Action Corrosion - electrical & chemical Buckling (upheaval & lateral) Munitions slide 5

6 Landfall TOB 3km offshore. Through the inter-tidal zone. Buried, rock-dumped or in conduit. Protected At Risk From: Anchors & Trawl gear Munitions Very Strong Currents Wave Action - to seabed Erosion / Deposition Beach activities Corrosion - chemical & electrical Main types of Inspection: Conventional Inshore and Land Survey Methods slide 6

7 Why inspect? Money makes the world go round (value of asset, more product, efficient condition of pipeline) Environment Law slide 7

8 Regulations Up to 1996: Post 1996: Various regulations E.g. SI 1513 Complex Ambiguous Prescriptive Open to interpretation Pipeline Safety Regulations = SI 1996 / 825 Aligned with HSWA Simple Goal setting: Clause 13 The operator shall insure that a pipeline is maintained in an efficient state, in efficient working order and in good repair. PSR facilitated: Risk Based Inspection Cost savings & efficiency Innovative systems slide 8

9 The IMR cycle Maintenance & Repair Year 1GI Anomalies Maintenance & Repair Start Assess IMR Schedule Assess Review Schedule Report GI Year 1 Workscope Report GVI GI Year 21 Workscope Anomalies Inspection Anomalies & Monitor Items Inspection Data Data slide 9

10 How to Inspection Survey Platform Type / Method Component Notes / Restrictions RATS Platform based Visual - cameras NDT techniques Riser Down to splash zone Weather Diver Platform or DP vessel based Visual - cameras NDT techniques Riser Pipeline Point structures Landfalls Depth, Current Weather, Sea state HSE Landfall GI Inshore survey vessel Hull mounted Acoustic CP snake Pipelines Inshore only Weather, tides 1m Fishing gear Structural GVI Oil platform or DP survey vessel 3 X Eyeball ROV s Visual cameras NDT techniques FMD Legs Structural members Risers Weather Sea 2m Current, Visibility Seafloor structures only Pipeline GI Survey vessel ROTV Towed SSS Acoustic Pipelines Structures Cannot stop Current restrictions 2m Pipeline GVI DP survey vessel WROV DP follow sub Visual cameras CP Riser Pipeline Structures Current restrictions Visibility m slide 10

11 Platforms slide 11

12 Data acquisition Echo-sounder Side Scan Sonar Sub-Bottom Profiler Scanning Sonars Scanning Profilers Multibeam-swathe bathy Multibeam-profilers slide 12

13 Data processing Network / Server: Original Logged Data: SSS (Coda), Position & Sensor (ROV / Vessel) Working files: Coda Tag (Event) Files, Seamap, PRISM Files, Import / Export CODA Event Tag Files Seamap Processing Import Tag Files Seamap Processing Seamap Processing Offline Eventing Offline Event QC CODA (Geophysicists) SSS Image Capture Smooth Nav. Apply Tides Import Coda Event File Merge CODA Nav & bathy SEAMAP (PolPred) (Senior Data Processor) Export PRISM File Export Event File QC Event File SEAMAP (Senior Surveyor) Assign MI No's. Assign Anomalies Geophysicists Condition Summaries PRISM File C/W Anom & MI's MI List Anom List Span Anoms Span List Senior Surveyor Aquisition Summaries Reports Co-ordinator QC PRISM Files Collate Asset Reports PRISM Files, Images & Reports PRISM Files Determine MI's APA Span Analysis Assessed Anomalies & MI's Reports Co-ordinator Onshore QC'd Assessments APA Onshore Asset Reports QC'd PRISM Customer Comment Asset Reports IDC Clean DataSet PRISM Files PRISM Network slide 13

14 Reporting Deadlines: Anomalies threatening integrity: immediate Significant features - 24hrs - daily call From asset completion: Anomalies - 7 days Survey report - 4 weeks, including: PRISM Files Complete Reports Single Pager To achieve these goals the reporting process must: Automate repetitive tasks Be fully auditable Be systematic - no repetition Conduct QA & QC Have a clearly defined structure from the start slide 14

15 PRISM Software to manage data gathered during inspection process of client based subsea oil and gas infrastructure. A powerful year on year analysis tool. slide 15

16 RISM slide 16

17 PRISM slide 17

18 The future PRISM on Internet (rolled out 2004) Live data to client PC via internet - video & SSS? Digital cameras to supercede analogue - when? Another magnitude of data storage? Laser profilers? Move full reporting process onshore? Get rid of paper report? Greater emphasis on data rather than report. Digital cameras & software: new imaging techniques AUV s for GI survey? Coastal defence policy - consequences of erosion? Improve existing software slide 18

19 Conclusions Pipeline inspection is a mature business but continues to embrace new technology. Management of change: adapting to new systems. Digital age has almost eclipsed the analogue age. Days of pure GI / GVI cruises gone: the multi task GI / GVI cruise is here. Client (in the office) is getting closer & closer to live raw data. Control of multiple surveys through one contractor produces consistent results Inspection / survey must be fun! slide 19

20 slide 20

21 The most important thing slide 21

22 Q&A References: A- _R2zDpdY7AlJbw0wjY9AOrNtQ=&h=407&w=553&sz=61&hl=en&start=2&sig2=o8mWhUScwZFmH1Tqif2hAA&itbs=1&tbnid=ob43HW4BvRtEuM:&tbn h=98&tbnw=133&prev=/images%3fq%3dacoustic%2bseafloor%2btechniques%26hl%3den%26sa%3dn%26gbv%3d2%26ndsp%3d20%26tbs%3 Disch:1&ei=Z5OnS4mzGIqQjAeWqeSFAQ ntist.gif&imgrefurl= RvjumuGBbUZymLxGds6hrwuCaRg=&h=352&w=300&sz=38&hl=en&start=46&um=1&itbs=1&tbni d=tnfddqiw68xb3m:&tbnh=120&tbnw=102&prev=/images%3fq%3dscientist%26start%3d40%26um%3d1%26hl%3den%26client%3dfirefoxa%26sa%3dn%26rls%3dorg.mozilla:en-us:official%26ndsp%3d20%26tbs%3disch:1 slide 22