Norsk Industri Olje og Gass Åsgard Subsea Compression Main Learnings

Transcription

1 Norsk Industri Olje og Gass Åsgard Subsea Compression Main Learnings Classification: Open

2 Åsgard Subsea Compression 2 x 11,5 MW subsea compressors 40 km step out Water depth 270 meters Production 21 Mill Sm 3 /d Secure production of 306 mboe Prolong lifetime of 15 years

3 Why subsea compression for Åsgard A minimum gas rate is required to: Avoid dynamical instabilities in flow lines Ensure surge waves not exceed liquid handling capacity Maintain continuous MEG production Avoid hydrate incidents Compared to the Platform alternative: Increased recovery Accelerated production Reduced CAPEX Reduced OPEX HSE benefits Benefits increase with water depth and step-out distance

4 Qualification focus - Subsea compression Compressor design centrifugal compressor with upstream scrubber Robustness of seals, bearings and electrical insulation in contact with gas Liquid tolerance & flow smoothing Control systems (all-electric subsea control system ) Condition monitoring Power systems and components (including connection systems) Endurance testing Cooling Compressor Subsea Transformer Cooler HV connetor Antisurge Actuator

5 The Gas Compression Process

6 Subsea Compressor Station Modules Compressor 289 tons Scrubber 11x9x10m 210 tons 8x8x12m Pump 45 tons 5x5x6m Inlet/antisurge cooler 235 tons 15x10x7m Outlet cooler 107 tons 9x7x5m

7 System Complexity Test Philosophy Technology Qualification Program Qualification of components according to relevant standards Functional Unit Testing (FUT) Control system Aberdeen Pump - Tranby Compressor K-lab System Integration Test (SIT) Trains Egersund Commissioning Offshore Topside module Subsea manifold template Subsea compression station

8 Integration and functional testing Functional testing and system integration testing in 2014 Compressors & compressor power system tested at K-lab Control system and liquid pumps at AkerSolutions (Aberdeen / Oslo area) System integration test at Aker Solutions Egersund (West Coast Norway) 8 Classification: Internal

9 Functional Unit Testing at K-lab Testing of Pilot and Delivery Compressors K-lab modification Shallow water test pit 11,5 MW compressor shaft power 17 million Sm 3 /d flow rate hydrocarbon gas Condensate and water/meg injection Submerged test of pilot and delivery compressors 2014/2015

10 Åsgard Marine scope 10 Classification: Internal

11 Åsgard marine operations - critical installations Åsgard A HV swivel Remote hot tap tee (2012) Heavy lifts: topsides module Åsgard A, subsea compressor station template (2013) Remote hot tap Subsea transformers, UTAs with power cables (2014) Cassette base frames 1 & 2 (2014/2015) Subsea compression modules moon pool and special handling system (2015) Topsides module for Åsgard A Subsea compressor station template Special handling system

12 Marine Installation Simulator Training ÅSC Simulator OSC, Ålesund Training in simulator ROV Crew A «off shift» - monitors Crew B Clear Com so everybody hears everything Instructor Station = Virtual World in Gin Clear viz

13 Vessel Days in 2013: 706 Vessel Days in 2014: 541 Vessel Days in 2015: 383 ÅSC Marine Operations 2013 Activities Survey Rock dumping /Trenching Pipeline/PLEM installation Hot-tap Spool installation and tie-in Riser base installation Spool installation and tie-in Heavy lift Power Cables Module installation Number of Vessel used: 14 Number of connections made during module installation: HV connections: 12 Signal/controls connections: 208 Process piping connections: 44 North Sea Giant Prep, Risers, RFO, Spools, Tie-in

14 Åsgard subsea compression - Operation and intervention Workshop New Vestbase onshore facility for storage and maintenance Spare compression train onsite Intervention with North Sea giant will take ca 2-3 weeks Vessel has subsea process intervention system to manage flushing with MEG / nitrogen Condition monitoring system should provide early indications of issues Washing room Office building Storage hall Workshop hall Test pit Offices Store room

15 The Statoil Subsea Factory Oil export Sea water injection template with pumping Oil storage Oil pump Gas export Produced water injection template Power distribution and control Gas compression Gas, oil, produced water separation Produced water injection pump Production template Production template Manifold ROV intervention

16 Acknowledgements Åsgard/Mikkel partners: Petoro AS (Åsgard only) ENI Norge AS Total E&P Norge AS ExxonMobil Exploration and Production Norway AS Operator Operator Statoil Statoil Key suppliers Aker Solutions MAN Diesel & Turbo Reinertsen Saipem Nexans Technip Allseas Subsea compression station and Åsgard A&B topside modifications Subsea compressor (sub-contract to the Aker Solutions contract) Pipeline engineering Heavy lift (topside power module and subsea structures) Power cable and umbilical's Hot- tap Installation and marine operations New flowlines and PLEMs The vital contributions of a large number of other subsea and marine suppliers and contractors are also acknowledged

17 Presentation title Presenters name Presenters title Tel: Classification: Internal