Riggflytting av Maersk Drilling Jack-ups

Transcription

1 Riggflytting av Maersk Drilling Jack-ups november 2009, Clarion Hotel Stavanger Claus Schiller, Head of Towmasters Departement Per Frederiksen, Towmaster/ Kaptajn Introduction to Maersk Drilling & Maersk FPSOs

2 Maersk Drilling s Offices Houston Maracaibo Stavanger Aberdeen Copenhagen Esbjerg Baku Cairo Dubai Singapore (yard team) Brunei Rio Perth

3 Drilling rigs Jack-up rigs (12) MAERSK ENDURER MÆRSK GIANT MÆRSK GUARDIAN MÆRSK GALLANT MÆRSK INNOVATOR MÆRSK INSPIRER MAERSK RESILIENT MÆRSK RESOLUTE MÆRSK RESOLVE MÆRSK REACHER MAERSK COMPLETER MAERSK CONVINCER Egyptian Drilling Company (3 jack-ups) SENUSRET KAMOSE - ZOSER Cantilevered drilling Barges (4) MAERSK RIG 61 MAERSK RIG 62 MAERSK PATHFINDER MAERSK PIONEER Semi-submersible (4) MAERSK EXPLORER MÆRSK DEVELOPER MÆRSK DISCOVERER DEEPWATER SEMI Management (2 Semi-submersible) KAN TAN IV NAN HAI VI

4 Fleet location North Sea 7 Harsh envir. jack-ups GoM 1 Harsh envir. jack-up, mng 1 Deepwater semi-subs Egypt Venezuela 10 Drilling barges 1 Harsh envir. jack-up Egypt (EDC) 3 Jack-ups 39 Land rigs 22 Workover rigs Caspian Sea 1 Semi-submersible UAE 1 High efficiency jack-up Brunei ft jack-up Singapore (under construction) 1 High efficiency jack-up 2 Deepwater semi-subs Australia 2 semi-subs - mng

5 Causes of 226 Jack Up accidents over the 1979/1988 period Operators World-wide Soil Tow Blow-out/fire Collision Design Storm Other Fatigue Jacking War

6 Jack-up Accident Statistics Hurricane Punch-through Blow-out Structural failure Jacking system failure Leg structural damage Fire Collision Scour Other fundation failiures

7 Transport of Drilling Rigs Dry Tow Wet Tow Heavylift Tugs

8 Dry Tow

9 WET TOW Higher Risk involved Higher Insurance Premium MINIMAL FREEBOARD MUST ALLOW FOR SUITABLE Weather Windows

10 Offloading Semi Submersible off Congo

11 Punch-Through

12 Punch Through!!! (Or Fast Rapid Penetration)

13 Punch Through The Noble David Tinsley experienced the "punch-through" while conducting preloading operations on May All three legs have penetrated the sea floor off the coast of Qatar, causing severe damage to the jack-up and its legs.

14 Punch Through Vantage Drilling Rig, Sapphire Driller experiences a bow leg run / punch through in the early morning hours (03:00) on 30/Oct/2009. It appears a zero air gap preload was being conducted, which most likely minimized potential structure failure

15 MAERSK VICTORY Punch-through 1997 Adelaide, Australia

16 RPD = Rack Phase Difference - MIGHT RESULT IN A BOW-LEGGED APPEARANCE

17 Maersk Drilling Towmasters Maersk Drilling employs presently nine (9) Towmasters and three (3) Towmaster trainees They have a total Towmaster Experience of 81 years where they have been in charge of more than 1700 Rig Moves Maersk Drilling are moving their own and management units with a Towmaster in charge of rig and rig move operations. The Towmaster is taking over the responsibilities of the OIM

18 Maersk Drilling Towmasters RESPONSIBILITIES: Safety of Personnel and Unit Environment Assure Sea-worthy Condition Equipment in Safe Condition Equipment Operational Permit To Work System Daily Report to Shore Base and Towmasters Department

19 Maersk Drilling Towmasters WORK SCOPE INCLUDES: Prepare rigmove papers prior to rigmove Person in Charge (OIM) Unit's Stability Parameters Verify Weather Information Manning Requirements Maintain Accurate Event Log Prepare Rig Move Report Inspect Attending Vessels Raise Revision Request

20 Maersk Drilling Towmasters QUALIFICATIONS REQUIREMENTS: Master Mariner, Unlimited Incl. GMDSS, ARPA and First Aid Master Mariner, Liberia and Panama License Min. 8 years experience in Maritime Positions incl. 2 years offshore on MOU or AHT Proficient with Jacking Systems Proficient with Mooring Systems Knowledge of Safety Management System, Contingency Manual and Health and Safety Policy in force on board the MOU Valid Safety Training, Medical Certificates Participated in Geotechnical Assessments Successfully Completed Rig Move Courses

21 Training Programme for Towmaster Trainees # Qualifications / Curses Period Place 1 Jacking Simulator 5 days USA 2 Soil Evaluation /Special 2 days DGI, Lyngby 3 Offshore Meteorology 3 days DMI 4 Anchor Handling Simulator 5 days MTC, Svendborg 5 ARPA 3½ days Denmark 6 GMDSS 10 days Denmark 7 H 2 S, basic 1 day Denmark 8 First Aid 5 days Denmark 9 Management Seminar 5 days Denmark 10 Safety, world wide 5 days Esbjerg,MTC, NL 11 Rig Crew Resource 5 days MTC 12 Liberia/Panama Licences DK/UK / Norway Medical - Lægekontoret 14 Towmaster assistant, mdr All rig types approx. 20 rigmoves 15 Office, familiarization 3 weeks Office København 16 Towmaster Manual 2 days Incl. in pt Anchorhandler, onboard 2-4 weeks North Sea Recruiting from OIM, Barge Engineers and or AHTS Captains, Chief Officers Typical training period: 12 to 18 months - pending experiences 18 PC Driving Licence, - -

22 Various Towmaster assignments More than 1600 Rig Moves (start 1975) N kossa II Installation Curlew Towout + Installation North Sea Producer Towout + Installation Anasuria Towout + Installation Schiehallion Towout + Installation Varg Towout + Installation Draugden Troll Hibernia Harding Aasgaard, Towout & Installation Snoore B Maureen A ALC Sakhalin, Tow out of two Gravity Base Structures Towout and Installation of Pipe Lines Safety Case Preparations Marine Advisor for various Customers Planning and preparation of Procedures FPSO Sevan Hummingbird Towout + Installation FPSO Maersk Ngujima-Yin Installation

23 Tug Coordinator / Master TROLL A 2 GBS/Gas Tons Displacement HIBERNIA - PRODUCTION PLATFORM TOW-OUT (78 meter draft) TROLL A - PRODUCTION PLATFORM TOW-OUT (30 meter draft) DRAUGEN - PRODUCTION PLATFORM TOW-OUT (228 meter draft)

24 Who is this Person? Who will ensure and be responsible for: - All Requirements - Procedures: Safety / Operational -Rules - Policies - Systems - Good Seamanship ARE FOLLOWED, COMPLIED WITH AND OBSERVED?

25 Rig Move Flow Chart / Towmaster Manual

26 Site Assessments Input/Output ENVIRONMENTAL DATA E.G.: Year Wind & Wave Data - 10-Year Current Data - Expected Installation Period, Directional or Seasonal

27 Site Assessments Output

28 Geotechnical Analyses Input/Output INPUT: Soil Data Soil Data should fulfil Requirements stated in the Towmaster Manual Unknown Areas / Locations will require Core Samples / Soil Data from below each spud can OUTPUT: Penetration Curves Predicted Spud Can Penetration into the Soil for Loads increasing to a certain Level FINAL PRELOAD

29 More Penetration Curves

30 General Engineering Location Evaluation LOCATION EVALUATION CONSITS OF: 1. Site Assessments 2. Geotechnical Analyses 3. Recommendations from Engineering to Towmaster incl. Preloading

31 Rig Move Flow Chart End of Engineering s Involvement when the Location Evaluation is issued Towmaster s Department Takes Over SOW / RMP

32 Warranty Certificate of Acceptance

33 MD Management Certificate of Acceptance COA Issued by Warranty Surveyor MD S Requirements signed by Warranty Surveyor Penetrations Analyses Engineering Assessments Location Evaluation issued by MD Engineering Seabed Survey Towmaster s Letter of Instruction Operation Plan: SOW, Passage Plan Copies of Sea Charts Other Relevant Drawings

34 CEO Certificate of Acceptance

35 Ready to commence the Move Go Ahead received ALL Papers signed RIG MOVE ACCEPTED BY MD CEO Tow Team Towmaster(s) & Warranty Surveyor sign on MODU Inspection / Approval of MODU Seaworthiness, Operational, Certificates, Manning (Down!) MODU signs over from Person in Charge (OIM) to Towmaster Overall Responsible Weather Forecasts (2 Independent) available Suitable Weather Window(s) indentified Departure / Transit / Arrival When Installed MODU signs back to Person in Charge (OIM)

36 Briefing / Approval of Vessels Vessels are normally provided by Operator / Client All Vessels shall be fit for the Purposed and Intended Operation All Vessels must be in Compliance with the Standards stipulated in COA, SOW, Operation Manual and by Attending Warranty Surveyor - Towing/AH Equipment, Manning, Bunkers All Certificates must be Valid General Aim: All General Operations shall be in Agreements with the NWEA GUIDELINES

37 Bollard Pull Required

38 Arrival & Installation of a Jack-Up

39 Arrival & Installation of a Jack-Up Pin Rig in Stand-off loc, approx m to Final Run Anchors / utilization of DP Classed AHTV Re-connect Tugs 1. Winch Rig to Final Pos assisted by Tugs 2. Walk Rig to Final Pos assisted by Tugs Pin Rig in Final Final Position approved by Client Commence elevating Hull / Preloading Disconnect Tugs Recover Anchors Preload: Site Specific. Shallow / Deep Penetrations Punch Through / Rapid Penetrations Hold / Dump Preload Water Elevate Hull to Final Air Gap

40 Positioning of a Rig VERY CLOSE (Minus 1 meter) at a Platform with Pipelines Close to and between Spud Cans REQUIRES A STEADY HAND Fine tunings!

41 Spud Cans The Shoes of the Rig Area: 380 m 2 Diameter: 22 m Equivalent Shoe size (EU): !!!

42 Risk of Rapid Penetrations / Punch Through Minimum Air Gap Starting with hull at draft Preload as Close as Possible to Sea Level - Gain Buoyancy in Case of Rapid Penetrations - Weather and Sea State -Tide Preload one Leg at a time - Reducing overall Weight of the Rig and by then minimising Potential Structure Damages Close monitoring of the Initial Penetrations versus Seabed Reactions - First Indication of which Penetration Curve Spud Can follows: Lower or Upper Bound or?

43 Departure Freeing Legs Legs and Spud Cans are stuck in the Soil due to a Combination of Vacuum underneath Spud Can and Soil on top of Spud Can Jetting below Spud Cans will break down the vacuum and start filling up the Gap generated by Legs creeping upwards Hull Buoyancy is overcoming the Weight of Soil on top of Spud Cans

44 Freeing Legs Pull + Jet

45 Spud Can, seen from below Size, each of three: m² NB! Tip & Jetting Nozzles

46 Freeing Legs PULL (No Jetting)

47 Thank you for your staying power STILL TIME FOR QUESTIONS!!!