DREDGING. with particular emphasis on Oil and Gas activities in Canada

Transcription

1 DREDGING with particular emphasis on Oil and Gas activities in Canada

2 Dredging is an excavation activity or operation usually carried out at least partly underwater, in shallow seas or fresh water areas with the purpose of gathering up bottom sediments and disposing of them at a different location. In Holland dredging and land reclamation has been ongoing for centuries, ever since the Frieslanders first settled there. GOD CREATED THE WORLD BUT THE DUTCH CONSTRUCTED HOLLAND

3 Dredger categories Construction of sacrificial beach islands and sub-sea berms Channel and harbour dredging Land reclamation and coastal protection Tailings transfer, MFT reclamation & mud farming (Oil Sands) Excavation of glory holes Trenching for pipelines Pipe and cable laying and intervention Placement of protection/pipeline intervention Platform and wellhead intervention Land falls and shore approaches Environmental clean up and disposal Decommissioning Innovation, Engineering and Development Equipment past present and future

4 DREDGING - CATEGORIES MECHANICAL BUCKET DREDGERS CLAMSHELL DREDGERS BACK HOE DREDGERS HYDRAULIC CUTTER SUCTION DREDGERS SUCTION DREDGERS TRAILING SUCTION HOPPER DREDGERS SPECIALTY EQUIPMENT FALL PIPE VESSELS ROCK PLACEMENT EQUIPMENT DEEP WATER GRAB SYSTEMS

5 Construction of sacrificial beach (artificial) islands

6 Construction of sacrificial beach (artificial) islands Construction by pump ashore suction dredge and bow discharge from trailer suction hopper dredgers

7 Construction of artificial islands Trailer Suction Hopper Dredge Stage 1 bottom dumping Stage 2 - rainbowing Stage 3 pump ashore

8 Construction of sub-sea berms for caisson deployment

9 Channel and Harbour Dredging

10 Rainbowing

11 Land Reclamation

12 Reclamation

13 Coastal protection design and installation

14 Tailings transfer, MFT reclamation & mud farming (Oil Sands)

15 Tailings transfer, MFT reclamation & mud farming (Oil Sands)

16 Excavation of Glory Holes Glory hole dredging has been achieved using trailer suction hopper dredgers with extended suction pipes and mechanical Grab Excavating Systems

17 DREDGING -for OIL and GAS activities in Canada Excavation of Glory Holes

18 Trenching for Pipelines Modern plough design Conventional excavation with a draghead

19 Pipe and Cable laying

20 Placement of protection

21 Placement of protection

22 Platform & Well Head intervention Material placed mechanically Material placed with a fall pipe

23 Landfalls and Shore Approaches

24 Environmental cleanup and disposal Pollution Recovery System Designed to remove oil and chemicals from vessels lying on the sea bed in very deep water without using divers. Currently depths of 500 meters can be obtained and greater depths down to 4000 meters are envisaged. Artificial island constructed to place environmentally sensitive materials. Disc cutter developed for removing polluted materials. Trailer suction hopper dredge with modified suction pipe arms for collecting surface oil.

25 So what is new in the dredging business since our days in the Canadian Beaufort? HEALTH & SAFETY PROGRAMS QUALITY MANAGEMENT SYSTEMS TRAINING ENVIRONMENTAL MANAGEMENT SYSTEMS INNOVATION, RESEARCH & DEVELOPMENT FLEET REPLACEMENT PROGRAMS

26 DREDGING - GOING DEEPER Innovation, Engineering & Development Concept designs are currently being engineered to excavate material and place protection at depths of more than 250 meters below sea level

27 DREDGING EXCAVATING HARDER MATERIALS Innovation, Engineering &Development Pipeline trenching is now possible in seabed soils with UCS values up to 30 MPa in harsh metocean conditions and environmentally sensitive areas. Hard soil is normally dredged by means of a Cutter Suction Dredger. Special drag heads (ripper drag heads) are developed for large Trailing Suction Hopper Dredgers for the dredging of harder soil.

28 DREDGING - EQUIPMENT PAST D Artagan kw Cornelius Zanen 8000 M3 J.F.J DeNul kw Cristobal Colon M3 W. D. Gateway 6000 M3 Leif Eriksson M3 Ham M3 Beaver Mackenzie Geopotes X M3

29 DREDGING EQUIPMENT PRESENT D Artagan kw Cristobal Colon M3 J.F.J DeNul kw Leif Eriksson M3 Ham M3

30 DREDGING - FLEET REPLACEMENT PROGRAMS A new generation Willem van Oranje Gateway

31 DREDGING - Innovation, Engineering and Development Dynamically Positioned Fallpipe Vessel (DPFV) Carrying capacity 24,000 ton Under Construction

32 DREDGING - Innovation, Engineering and Development Multi-purpose vessels for offshore project support Side stone dumping Cable laying Diving Support Salvage Heavy lift & transport Pipeline shore approach construction (pipe-pull)

33 DREDGING - Innovation, Engineering and Development Development of remote controlled sub-sea excavating equipment

34 DREDGING - Innovation, Engineering and Development Under development special equipment for shallow water pipe laying

35 DREDGING when SIZE MATTERS D Artagan kw Cristobal Colon M3 J.F.J DeNul kw Leif Eriksson M3 Ham M3