Offshore Drilling Technology

					                                          Part V

                                   Offshore drilling
                                     technology

                                   Carita, Banten, Indonesia
                                       14 December 2005


                                   Prof. dr. Arnfinn Nergaard
                                    University of Stavanger
                                      Smedvig Offshore




V - Offshore drilling technology

Part 1   The drilling process

Part 2   Drilling platform types




                                                       SO-0101-2004-PR-00070 - Page 2




                                                                                        1
Offshore drilling technology - Part 1



First drilling rig type

                                        Colonel Drake

                                        Titusville, USA, 1859

                                        The ‘inventor’ of rotary
                                        drilling for petroleum
                                        exploitation.




Source: Kenneth Larsen, Statoil

                                                          SO-0101-2004-PR-00070 - Page 3




Offshore drilling technology - Part 1




   Drilling operation

   How do we do it?
       We use energy to break up the rock and create a hole


       The energy consists of rotation and hydraulic forces


       The energy is optimised by ‘tuning’ drilling parameters


       After drilling a section of the well, it is sealed off
       with steel pipe to ensure integrity for the following
       well section


Source: Kenneth Larsen, Statoil

                                                          SO-0101-2004-PR-00070 - Page 4




                                                                                           2
Offshore drilling technology - Part 1


  Drilling operation
  How do we do it?
  Drill large   Run casing Cement casing Drill hole          Run casing Cement casing        Drill hole
  hole          in open hole in place                        in open hole in place




  Turn drill bit to the right
  and pump!




Source: Kenneth Larsen, Statoil

                                                                                                    SO-0101-2004-PR-00070 - Page 5




Offshore drilling technology - Part 1



   How do we do it?
                             30"                       +/- 80 m,
                             cond.                     driven
                             20"
                             casing                   +/- 400
                                                      m
                             133 lb/ft
                             16"
                             casing                  +/- 1000
                                                     m
                             or liner                              Build 40 - 45 deg angle
                                                                   starting from about
                                                                   1000 m.
                                                                   Maintain angle to TD.

                             13 3/8"                +/- 3700
                             casing                 mMD
                             72 lb/ft.              +/- 3000
                                11 3/4"             mTVD
                                liner
                                contingen
                                cy



                                  9 5/8"          +/- 5000
                                  casing.         mMD
                                  53.5 lb/ft      +/- 4000
                                                  mTVD
                                                             Possible
                                                             HC's
                                         7"
                                         liner
                                         32      +/- 7500
                                         lb/ft   mMD
                                                 +/- 6000
                                                 mTVD

Source: Kenneth Larsen, Statoil

                                                                                                    SO-0101-2004-PR-00070 - Page 6




                                                                                                                                     3
Offshore drilling technology - Part 1




 Drilling bits




Source: Kenneth Larsen, Statoil

                                                       SO-0101-2004-PR-00070 - Page 7




Offshore drilling technology - Part 1



 Hoisting system
                   Crown
                   block

                                        Derrick
                    Block
                    line
            Travelling
            block
                                         Drill string stands
                                         stored in derrick

          Draw-
                                          Rig
          works
                                          floor

Source: Kenneth Larsen, Statoil

                                                       SO-0101-2004-PR-00070 - Page 8




                                                                                        4
Offshore drilling technology - Part 1


       Rotation system

                                                                 Shows Varco's
                                                                 Top Drive
                                                                 Systems

                                                                 Additional, the
                                                                 traditional
                                                                 rotary table is
                                                                 widely used.




Source: Kenneth Larsen, Statoil

                                                                          SO-0101-2004-PR-00070 - Page 9




Offshore drilling technology - Part 1



Circulating system
                                         Shale shakers
              Fluid tanks

                                                         Fluid returns




                                  Solids control equip




                                       Piping



  High pressure pumps




                                                                   Well




Source: Kenneth Larsen, Statoil

                                                                         SO-0101-2004-PR-00070 - Page 10




                                                                                                           5
Offshore drilling technology - Part 1



Pressure control system
                                                                            From mud pumps



                                                                                        Drillpipe
                                                                  Bag type BOP

 Control unit
                                                   Junction box



                                   Control lines


                                                                        Ram BOP




                                                                       Ram BOP
                                  Choke lines




                                                                       Ram BOP




                                             Cement unit
                Choke manifold
                  with valves


                                                                     Well

Source: Kenneth Larsen, Statoil

                                                                                             SO-0101-2004-PR-00070 - Page 11




Offshore drilling technology - Part 1


  Subsea BOP stack




Source: Kenneth Larsen, Statoil

                                                                                             SO-0101-2004-PR-00070 - Page 12




                                                                                                                               6
Offshore drilling technology - Part 1


    Well design
                                  30"                        +/- 80 m,
                                  cond.                      driven
                                  20"
                                  casing                   +/- 400
                                                           m
                                  133 lb/ft
                                  16"
                                  casing                   +/- 1000
                                                           m
                                  or liner
                                                                         Build 40 - 45 deg angle
                                                                         starting from about 1000
                                                                         m.
                                                                         Maintain angle to TD.


                                  13 3/8"                +/- 3700
                                  casing                 mMD
                                  72 lb/ft.              +/- 3000
                                                         mTVD
                                     11 3/4"
                                     liner
                                     contingenc
                                     y




                                       9 5/8"          +/- 5000
                                       casing.         mMD
                                       53.5 lb/ft      +/- 4000
                                                       mTVD

                                                                     Possible HC's

                                              7"
                                              liner
                                              32      +/- 7500
                                              lb/ft   mMD
                                                      +/- 6000
Source: Kenneth Larsen, Statoil                       mTVD


                                                                                                    SO-0101-2004-PR-00070 - Page 13




Offshore drilling technology - Part 1



 Directional drilling design
     Conventional motor
                                                                 Rotational
                                                                 steerable system




Source: Kenneth Larsen, Statoil

                                                                                                    SO-0101-2004-PR-00070 - Page 14




                                                                                                                                      7
Offshore drilling technology - Part 1



  Extended reach well in Statoil




Source: Kenneth Larsen, Statoil

                                        SO-0101-2004-PR-00070 - Page 15




Offshore drilling technology - Part 1


      Statoil extended reach wells




Source: Kenneth Larsen, Statoil

                                        SO-0101-2004-PR-00070 - Page 16




                                                                          8
Offshore drilling technology - Part 1



  World extended reach wells




Source: Kenneth Larsen, Statoil

                                            SO-0101-2004-PR-00070 - Page 17




    V - Offshore drilling technology

    Part 1        The drilling process

    Part 2        Drilling platform types




                                            SO-0101-2004-PR-00070 - Page 18




                                                                              9
Offshore drilling technology - Part 2


    Overview - Drilling platform types
                                                   Offshore


                                  Exploration                               Production


                                              Buttom Surface
       Land              Floaters                                                           Subsea
                                              support platforms




                                                              Permanent
                                                 Jack-ups




                                                                                                       Jack-ups
                                                                          Tenders
                        Semis




                                                                                    Semis
                                      Ships




                                                                                             Ships
                                                                                            SO-0101-2004-PR-00070 - Page 19




Offshore drilling technology - Part 2




                                                            Land rigs


                                                            Deutags
                                                            ‘T-47’ land rig.

                                                            Drilling at BP's
                                                            Wytch Farm field in
                                                            Southern England.

                                                            Extended reach wells to
                                                            12,000 m horizontal
                                                            displacement



Source: Kenneth Larsen, Statoil

                                                                                            SO-0101-2004-PR-00070 - Page 20




                                                                                                                              10
Offshore drilling technology - Part 1



 Offshore semi submersible drilling rigs
    Floating

    Moved by towing vessels, or by its own power

    Station keeping through anchors or propellars
    (Dynamic Position)

    Blowout Preventer is on sea bed

    Any weather condition, any waters, but problems with ice

    80 - 3000 m water depth

    Approximate costs: 50,000 - 250,000 USD/day

Source: Kenneth Larsen, Statoil

                                                            SO-0101-2004-PR-00070 - Page 21




Offshore drilling technology - Part 2



Semi submersible drilling rigs



                                  Principles:
                                   BOP on sea bottom
                                   Rig connected to wellhead via a riser
                                   Rig moves with the sea motion
                                   Anchored or dynamic position system




Source: Kenneth Larsen, Statoil

                                                            SO-0101-2004-PR-00070 - Page 22




                                                                                              11
Offshore drilling technology - Part 2



   Semisubmersible drilling rigs

                                             Smedvig’s
                                             West Venture
                                             is a deepwater
                                             semisubmersible

                                             Dynamic positioning

                                             One of the world's
                                             largest semis




                                                        SO-0101-2004-PR-00070 - Page 23




Offshore drilling technology - Part 2




 Semisubmersible drilling rigs

                                        Smedvig’s
                                        West Alpha
                                        semisubmersible rig




                                                        SO-0101-2004-PR-00070 - Page 24




                                                                                          12
Offshore drilling technology - Part 2



 Drill ships

    Floating
    Moved by its own power
    Station keeping by anchors or propellars (dynamic position)
    Blowout Preventer is on sea bed
    Any weather condition, any waters, but problems with ice
    80 - 3000 m water depth
    High payload capacity, will ‘travel and drill’ with minor support
    Good for remote areas, high speed
    Approximate costs: 100,000 - 250,000 USD/day


Source: Kenneth Larsen, Statoil

                                                       SO-0101-2004-PR-00070 - Page 25




Offshore drilling technology - Part 2


 Drill ships

                                        Transoceans
                                        ‘Deepwater Millenium’
                                        drill ship.




Source: Kenneth Larsen, Statoil

                                                       SO-0101-2004-PR-00070 - Page 26




                                                                                         13
Offshore drilling technology - Part 2


 Drill ships




 Smedvig’s West Navigator drill ship has the double Ram Rig concept.




                                                                 SO-0101-2004-PR-00070 - Page 27




Offshore drilling technology - Part 2




   Offshore jack-up rig characteristics

      Present throughout the world

      Water depth 20 - 125 m

      Can drill wells through platform

      Can ‘skid over’ onto platform

      Moving a jack-up is a critical operation

      Approximate costs: 20,000 - 200,000 USD/day



Source: Kenneth Larsen, Statoil

                                                                 SO-0101-2004-PR-00070 - Page 28




                                                                                                   14
Offshore drilling technology - Part 2



 Jack-up rigs
                                            Shallow water
                                            cantilever jack-up.

                                            Jacked down and
                                            preloading prior
                                            to commencement of
                                            operations.




Source: Kenneth Larsen, Statoil

                                                                 SO-0101-2004-PR-00070 - Page 29




Offshore drilling technology - Part 2



  Platform rigs
                                        Statoil’s
                                        ‘Troll A’ drilling rig

                                        Offered for sale!




Source: Kenneth Larsen, Statoil

                                                                 SO-0101-2004-PR-00070 - Page 30




                                                                                                   15
Offshore drilling technology - Part 2



     Tender support vessel characteristics

        Supports a drilling operation on a platform

        No drilling facilities required on platform

        Extensively used in the Far East

        Quick rig-up and rig-down

        Effective in shallow water depths

        Effective in good weather conditions

        Approx. costs: 20,000 - 50,000 USD/day


Source: Kenneth Larsen, Statoil

                                                         SO-0101-2004-PR-00070 - Page 31




Offshore drilling technology - Part 2



   Tender support vessels

                                         Smedvig’s
                                         ‘T-8’,
                                         working in
                                         the Far East.




                                                         SO-0101-2004-PR-00070 - Page 32




                                                                                           16
Offshore drilling technology - Part 2


  West Seno - The mini TLP




                                               West Alliance



                                                         SO-0101-2004-PR-00070 - Page 33




Offshore drilling technology - Part 2


Field development example
Drill more wells from TLP and connect TLP to subsea wells



                                              mini TLP
            FPSO
                                        TSV

 +/-
 1500m




 +/-1000m


 HC pay zone

Source: Kenneth Larsen, Statoil

                                                         SO-0101-2004-PR-00070 - Page 34




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DOCUMENT INFO
Description: Offshore Drilling, Drilling Technology, Oil and Gas, oil spill, the gulf, Offshore oil drilling, deepwater drilling, offshore oil, OFFSHORE WELLS, water depth, deep water, Fulbright & Jaworski, Energy Policy, offshore drilling industry, patent infringement, oil industry, urged Congress, shallow water, Gulf of Mexico, Business Wire, Transocean Offshore, drilling rig, drilling business, oil spills, development summary, the Gulf of Mexico, Drill ships, Drilling Equipment, Well drilling,