BOSKALIS OFFSHORE MINING

Transcription

1 BOSKALIS OFFSHORE MINING GERTJAN GRUNDLEHNER SANDER STEENBRINK UNDERWATER MINING INSTITUTE 2012 SHANGHAI, CHINA OCTOBER september

2 INDEX 01 BOSKALIS INTRODUCTION 02 ONSHORE MINING EXAMPLE 03 OFFSHORE MINING EXAMPLE 2

3 PROFILE Leading global dredging & marine expert Provide Solution: innovative, sustainable and all-round for infrastructural challenges in the maritime, coastal and delta areas of the world Sustainability and safety are a top priority Wide range of maritime services comprising dredging, dry infrastructure, towage, salvage, transport and heavy lift Founded in 1910 Main clients include oil and gas companies, port operators, shipping companies, EPC contractors, government agencies, international project developers, insurance companies and mining firms. 3

4 OUR ACTIVITIES 4

5 OUR WORLD 14,000 employees 1,100 vessels 75 countries across 6 continents 5

6 BOSKALIS ONSHORE & OFFSHORE MINING 6

7 BAUXITE MINING LELYDORP I - SURINAM 7

8 DREDGING FOR OVERBURDEN REMOVAL Overburden layers (6-25m) in large quantities Independent of bearing capacity Elevation around sea level and availability of water High productions possible with dredging 8

9 WORK SEQUENCE LELYDORP I PROJECT 9

10 MOBILIZATION OF THE DREDGER TO SITE 10

11 CHATHAM RISE ROCK PHOSPHATE 250+ nm m 11

12 MINING METHOD DEVELOPMENT Extraction Mining tool(s), Support, motivation Environmental criteria Lifting Method Preparation Tailings Separation Process and installation Transport Offloading Same or separate ship Ship and shore facilities 12

13 OR IN THIS SEQUENCE OR? Extraction Mining tool(s) Support, motivation Environmental criteria Tailings Separation Lifting Process and installation Method Preparation Transport Offloading Same or separate ship Ship and shore facilities 13

14 DESIGN PROCESS IN A NUTSHELL 14

15 USUAL QUESTIONS SIMPLE, ROBUST, CHEAP, CLEAN AND SAFE? PROVEN AND INDUSTRY ACCEPTED? DO IT WITH EXISTING EQUIPMENT? TIME TO MARKET? RENEWAL / REPLACEMENT AVAILABLE? RE-USE THE EQUIPMENT? THE ANSWER 15

16 MULTI-DISCIPLINARY TEAM EFFORT GEOPHYSICS PRODUCTION CALCULATION COST ESTIMATION SEPARATION TECHNOLOGY NAVAL ARCHITECTURE MECHANICAL DESIGN ECOLOGY HYDROGRAPHIC SURVEY DREDGING RESEARCH PROJECT MANAGEMENT BUSINESS UNIT MANAGEMENT 16

17 PRIMARY EXTRACTION METHOD Host sediment layer (35 cm avg, silty, weakly cohesive) Ooze (sticky, clayey chalk) NOT to be mined Suited for fluidisation Normal drag head jet water suction 17

18 SUPPORT / MOTIVATION SEABED TRACTOR? TRACTION = WEIGHT = Max ~60 deg EXISTING SYSTEMS MAX 160 M WD 18

19 SUPPORT BOSKALIS / MOTIVATION DEEPTRAIL CONCEPT 1.5 m 2 /sec => NO delays on seabed Our best partners: + Traditional pipe replaced by hose and wires Traction through tow wire equilibrium Tolerable to heavy seas 19

20 ORE SEPARATION CLOSE TO SOURCE? Pro: Near seabed gives less lifting requirements Con: Less control of process and tailings Con: More complexity subsea Con: Deployment and intervention 20

21 ORE SEPARATION AT SURFACE VESSEL Con: More lifting pump power Pro: Full control of variable separation process Pro: Keep continuous hydraulic process Pro: Only fully proven components subsea

22 RETURN OF TAILINGS CRP-target = minimal environmental effects No tailings on areas to be mined To keep in pace with production Resulted in substantial return system 23

23 ENVIRONMENTAL CONTROL Detailed plume development studies Effect of sediment resuspension on benthic life Mining plan to enhance re-colonisation (Building with Nature ecological sand pit MV2) These studies used by CRP in dialogue with NZ community 24

24 TRANSPORT TO SHORE Dry end product to shore Various unloading locations On-site transshipment max s mining time Harsh waves on Chatham Rise Crew changes, bunkering, R & M 25

25 THE RESULT On-going (engineering, financing, environmental, ) Decisions evolve with overall criteria Developing insights lead to change in weighing Design choices fully inter-linked and dynamic Handled effectively by team with common goal Central driver is the project (not the tools) Other mining projects lead to other solutions Open cooperation with concession holder is instrumental Boskalis can cover all these aspects 26

26 THE JOURNEY HAS JUST BEGUN 27