ECOSSE Subsea Systems. because we think differently...

Transcription

1 ECOSSE Subsea Systems because we think differently...

2 Ecosse Subsea Systems Established in 1996, Ecosse Subsea Systems has earned a global reputation for outstanding service delivery to the subsea oil and gas and offshore renewable energy markets. Trenching Subsea and Deepwater Lifting Technology Development Personnel Offshore Operations Engineering Consulting Mechanical and Electrical Technicians because we think differently...

3 Our Services because we think differently...

4 Existing Clients During Ecosse Subsea has performed contracts for various customers including: Subsea 7 Clough CNR International CRC Evans DOF Subsea Fairfield Geolab Houlder Offshore ISS Ithaca PetroCanada PSN Saipem Shell Technip Bibby Offshore because we think differently...

5 Mike Wilson Managing Director (background) Engineering Diploma RGU (RGIT) Aberdeen Offshore technician on trenching system since 1985 Offshore Manager on towed ploughs, pipelay, subsea lifting since 1990 Project engineering on trenching, pipelay projects Project Manager on trenching projects since 1995 Client representative on trenching, pipelay, heavy lifting projects since 2000 Founder Ecosse Subsea in 1996 because we think differently...

6 Arctic and deep trenching, backround Ice runs aground in shallow water in the Arctic seas, and cuts into the seabed as it is pushed further by wind, current, and the pressure of other ice. Dramatic patterns of seabed gouges are revealed by side-scan sonar. Often the gouges are several metres deep. Repetitive gouge mapping confirms that gouging is a contemporary process, rather than a relic from earlier periods in which the water level and the ice climate were different (Chua, Palmer, Tjiawi) Soft clays Stiff and hard clays Glacial till Bedrock Steep slopes and complicated morphology because we think differently...

7 glacial Till/bedrock/glacier

8 Typical Arctic trench specification Trenching to depths greater than current industry norms - burial depths greater than 3m, with potential trench depths as much as 7m Trenching in soil conditions that are difficult and highly variable Trenching in water depths beyond the majority of trenching requirements - water depths up to approximately 300m Operating in harsh marine conditions because we think differently...

9 Pre-cutting or post lay trench? Trenching project is likely to last several months in very challenging conditions. Which method would you choose? A system that holds on to your pipe/cable on every pass or not? Backfill? A requirement? we think differently

10 What do yesterday s trenching tools look like? because we think differently...

11 What do yesterday s trenching tools look like? we think differently

12 because we think differently...

13 Subsea Trenching System pedigree Concept - Ecosse Subsea Systems FEED Engineering Business (EB) Detailed design and FEA- Wilton Group Fabrication of major assemblies Dales Peterhead Assembly - Maritime Developments Peterhead Pre-project trials TBA

14 A modified conventional plough designed to cut a single pass Trench of 1.4m 5m+ Trenches in multi pass mode and in difficult terrain Can be launched and recovered like an anchor, primarily from a conventional vessel of around 150T bollard pull, but depending on location and soil type can be operated from any suitable vessel, e.g. a DSV SCAR Plough because we think differently...

15 SCAR TOOL skid 6m wide share Plan SCAR with multipass skid because we think differently...

16 Single Pass 1400mm depth

17 Multi Pass 1.2m-2m

18 SCAR SUPPORT VESSEL SCAR Tool SCAR Support Vessel SCAR SVS control skid we think differently

19 SCAR Towing Operations SCAR Support Vessel Seabed SCAR SCAR has almost no moving parts and will be the most reliable plough Plough can be built in different sizes to suit products and bollard pulls Plough position can be monitored real time we think differently

20 1 st and 2 nd cuts with SCAR seabed SCAR 1 st Cut Flat skid 1 st Cut Trench seabed SCAR 2 nd and subsequent cuts with multipass skid 2 nd Cut Trench we think differently

21 Verification of Model To verify the behaviour of the plough model during impact with a boulder, exaggerated deformation images were used we think differently

22 FEA Results Stress contour image of Plough (Rear view) we think differently

23 SCAR fitted with post lay burial roller cradles

24 1 st pass post lay burial 2 nd pass asymmetric trenching 1st Pass 2nd Pass

25 SCAR plough cable trenching post lay asymmetric multi-pass trenching we think differently

26 Simultaneous MFE If the trenching requirement exceeds a depth of 2.5m, MFE equipment has to be fitted to remove the spoil. At these trench depths the mouldboards are no longer effective in clearing the spoil and it would simply flow around and over, refilling the trench. The MFE equipment jets the spoil and small boulders up and out of the trench preventing trench infill. TRENCH TOP LEVEL

27 An MFE can also be deployed from a surface vessel, behind the plough along the trench, jetting away the remaining spoil with an ROV monitoring position

28 Does size matter? Does your trenching system require massive bollard pull or high electrical power from your engines? Te lifting devices to launch and recover in 2m seas? Ships accommodation of 80+ persons Have you considered other lifting and deployment methods? we think differently

29 Until now the size of the plough is totally dependant on the support vessel namely the handling capacity of the stern roller or the crane/a-frame. Bigger ploughs are possible using ESS subsea gel lifting techniques for deployment

30 Thank you we think differently