Video: Digitizing Flexible Riser Annulus Testing by Automated Portable Test Equipment
- Torbjørn Amundsen (4Subsea) | Christoffer Nilsen-Aas (4Subsea) | Øystein Kanestrøm (4Subsea) | Øyvind Tveit (4Subsea)
- Document ID
- Offshore Technology Conference
- Publication Date
- Document Type
- 2017. Copyright is retained by the author. This presentation is distributed with the permission of the author. Contact the author for permission to use material from this video.
- 4 Facilities Design, Construction and Operation, 4.6 Natural Gas, 4.6 Natural Gas, 2.1.3 Completion Equipment, 4.2 Pipelines, Flowlines and Risers, 4.2.4 Risers, 6.3.3 Operational Safety
- Flexible riser, Annulus testing, Integrity Management, Automated test equipment, Annulus monitoring
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Automation of testing of flexible risers and the subsequent capture of the results into a data reservoir, will improve integrity management, reduce maintenance costs, and increase operational safety. Overall, data quality, quantity, consistency and immediacy are much improved, hence providing a more reliable basis for predictive analyses.
With more than 3000 flexible risers in operation worldwide one of the most common methods to verify the integrity of the flexible risers is to perform annulus volume testing on a regular basis to assess:
Integrity of the outer sheath–
Annulus vent port flow–
Liquid filling of the annulus
Based on annulus vent gas monitoring technology designed for permanent installation offshore, an automated portable unit has been developed. By using predictive analyses, it is now possible to give feedback to the user if the results are within the expected range so that mitigating actions can be taken immediately. By automating and digitizing the required testing of flexible risers, service personnel are not required to follow the equipment which is beneficial in remote locations. Automated processes also make it easier to ensure consistent test methods.
The main objectives of this paper are to;
Show that automated equipment can perform the annulus volume testing without mobilizing personnel from shore–
Demonstrate that it is possible to predict the expected development of the riser condition by digitizing data from thousands of annuli test results.
Two major oil companies have tested the automated portable inspection unit offshore on North Sea installations, with good results.