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  • Managed Pressure DrillingSociety of Petroleum Engineers- Ghana

    Kenny Thomson

  • KennyThomson

    2

  • To Give an introduction to Transocean and our operations in GhanaTransocean and our operations in Ghana

    I t d M d P D illi Introduce Managed Pressure Drilling Explain Conventional drilling

    E l i M d P D illi Explain Managed Pressure Drilling Advantages of MPD MPD Equipment and Rig ConsiderationsMPD Equipment and Rig Considerations MPD risks and control measures MPD Rewards History / Future of MPD

    Close with Questions and Discussion3

    Close with Questions and Discussion

  • 129 Offshore drilling units50 Offices and Training centres

    C4

    30 Countries6 of the worlds 7 Continents

  • 50 High-Specification Floaters

    25 Mid Water Floaters25 Mid-Water Floaters

    9 High Spec Jack Ups9 High-Spec Jack-Ups44 Standard Jack-ups

    2 Ultra Deepwater Drillships4 High-Spec Jack-Ups

    5

    g p pUnder Construction

  • G lf f G i R iGulf of Guinea Region

    DSP MAR 702MTR ADX

    135ENR

    MTRBAL

    ADX

    AD9Hi7MGL

    JRY

    Ult D t D ill hi 2

    Region Summary

    Ultra Deepwater Drillships 2Semi Submersibles 4Jack-Ups 6

    6

    Jack-Ups 6

  • GSF Monitor

    Jack-up rig Bottom Supportedpp 25ft-400ft Water

    DepthDepth Cte d'Ivoire

    7

  • Transocean MarianasSedco Energy

    MAR MAR Semi-Submersible

    M d Basic spec Moored 7000ft of water

    ENR ENR Semi-Submersible

    Dynamically positioned8

    Dynamically positioned 7500ft of water

  • Discoverer Spirit

    Dynamically positioned 10,000ft of water Self Propelled Drill ship Liberia

    9

  • Transocean People

    18,000+ Employees globally

    Transocean will be Universally recognized for

    , p y g y

    innovation and excellence in unlocking the worldsoffshore resources

    We will be ourCustomers trusted

    partner and their ppreferred solution

    Provider

    10

  • MPD Definitione t o

    An adaptive drilling process used to precisely control the annular pressure profile throughout the wellbore

    I t ti l A i ti fInternationalAssociationofDrillingContractors

    11

  • Conventional SurfaceEEq.

    TopDrive

    Shaker

    Mud PitMud Pump

    12

  • Conventional Drilling

    Drillingfluidpumpeddownstring

    Returnsbackupannulustosurface

    Drilling fluid provides a barrier against

    p

    Drilling fluid provides a barrier against formation pressure

    To Prevent influx to the wellbore:Bottom Hole Pressure must be greater than

    BlowOutPreventor

    Formation Pressure

    BHP = Phyd + PcircBHP Pf

    13FormationPressure

  • Drilling Window

    TheoreticalWellProfilewithstraightlines

    LessthanPorePressure=Influxto Wellbore

    WellDepth

    Fracture

    toWellbore

    GreaterthanFracturePressureFracture

    Pressure

    Pore Pressure Drilling

    =Breakdownofformationie FluidlossesPorePressure

    Windowlosses

    14Pressure

  • ConnectionsWhile drilling:

    BHP = Phyd + PcircDrill pipesDrill pipes

    rackedrackedTop Drive,Top Drive,Rotates andRotates and

    y

    When stopping circulation for Connections:

    BHP = Phyd + PcircRotates andRotates andcirculates fluidcirculates fluidthrough drillthrough drill

    Connectionstringstring

    Connection

    WellDepth

    FracturePressure

    PorePressureBottomHolePressure

    15Top of drill stringTop of drill string Pressure

  • Real life well diagram

    Narrow DrillingNarrowDrillingWindow

    W ll

    Cannotaffordtoloosethe

    pressure fromWellDepth

    pressurefromCirculation,willtakeaninflux

    FracturePressure

    Cannotincreasemud density,will

    PorePressuremuddensity,willbreakdownformation

    16Pressure

  • Real life well diagram

    Narrow DrillingNarrowDrillingWindowThisWellisThisWellis

    UnUnDrillable!Drillable!Fault

    W ll

    Cannotaffordtoloosethe

    pressure fromNarrow

    Fault

    WellDepth

    pressurefromCirculation,willtakeaninflux

    DrillingWindowShale

    FracturePressure

    Cannotincreasemud density,willSand

    PorePressuremuddensity,willbreakdownformation

    Sand

    17Pressure

  • MPDC k P i l U d ill blCan make Previously Un-drillablewells, Drillable.

    Two main reasons: Constant Circulation through connections Pressurised fluid system, back pressure applied y , p pp

    at surface to act through entire system

    Constant and Controlled Bottom Hole Pressure throughout entire section.

    18

  • Advantages of MPD

    DrillingwithMPDSurfaceBackPressure

    FluidDensity+Friction

    DrillthroughNarrowDrillingWindows

    g

    +backpressureNolossinBottomHole

    Pressure during

    WellDepth

    Pressureduringconnections

    Depth

    Staticweight:

    Increasedvisibilityofunfavourablewell

    conditionsFluiddensity

    conditions

    Greatercontrolofdownb h l

    19Pressure

    bottomholepressure

  • MPD Surface Eq.

    TopDrive

    Mud Gas separator

    Constant circulation

    Shaker

    3PartTelescopicJoint

    Mud PitMud Pump

    RCD(RotatingCirculatingDevice)

    SurfaceAnnularFlowSpool

    Choke manifold

    20

    TopofMarineRiser

  • MPD EquipmentCirculating SubsCirculating Subs

    Next standNextstandofDrillpipeAddition to Drill floor

    mud manifold

    Side entry subs on top of each drill pipe

    CheckValves

    of each drill pipe stand

    Valves

    Drilling fluid routed through Side inletthrough Side inlet

    hose during connections

    Sideinlethose

    21

  • MPD EquipmentRotating circulating device; RCDRotating circulating device; RCD

    Sealingelements

    sealaroundBearing

    rotates with

    Positioned in Marine riser string near surface

    drillpiperotateswith

    drillpipeSealing elements are tight against drillpipe

    Elements housed in bearing which rotates with drillpipec otates t d p pe

    System is pressurized below RCDRCD

    Preventsreturns fluid

    22

    returnsfluidpassinguptheannulus

  • MPD EquipmentFlow Spool Surface AnnularFlow Spool, Surface Annular

    RCD

    Flow spool directs returning fluid from annulus through flexible flow lines

    SurfaceSurfaceannular

    FlowSpoolpFlowlines

    Surface annular in place in case of emergency where annulus pressure may exceed RCD pressure rating.

    23

    TopofMarineRiser

    y g Annular can be closed to work on RCD while

    maintaining pressurised system

  • MPD EquipmentChoke ManifoldChoke Manifold

    Coriolismeter

    Downstreamfluidflow

    All returns fluid passes through Choke Manifold

    Hydraulic chokes are where surface back pressure is

    applied

    Coriolis Mass flow meterCoriolis Mass flow meter

    All fluid downstream of

    Flowlinehoses

    Choke Manifold is atmospheric pressure

    24

  • MPD EquipmentMud Gas Separator cuttings cleaningMud Gas Separator, cuttings cleaning

    MGS

    If gas is detected in returns fluid, it is routed through MGSit is routed through MGS

    Gas is vented up to highest point on rig at tip of derrick

    Fluid continues to ShakersFluid continues to Shakers where solids are removed

    Everything thereafter is the same as conventional drilling

    25

  • MPD EquipmentControl and Display systemControl and Display system

    FlowInChoke

    positionBackPressure

    FlowOut

    26

  • Rig Considerations MPD equipment in moonpool

    Non MPD moonpool

    T l i J i tChokeManifoldTelescopicJointRCDSurfaceAnnularFlow Spool

    27

    FlowSpool

    TopofMarineRiser

  • Rig Considerations

    E h i i i ith diff t d i d i t Each rig is unique with different designs and equipment MPD compatibility is a large scale engineering project

    28

  • Rig Considerations

    Non standard operationp

    We introduce newMPD rig up in moonpool

    Operating procedures, Testing regimes,

    Maintenance plans andMaintenance plans and Rig up procedures

    New to our crews, trainingand familiarisation is

    essentialessential.

    Training helps ensure a

    29

    safe and efficientoperation

  • Risks of MPD &CControls in place

    No Static flow check Example Signature tests and trends observed

    Downhole problems may be masked by Constant Circulation and SurfaceCirculation and Surface

    Pressure

    Controls: Signature testing

    provides expectedprovides expected trends

    Close monitoring of trends carried out by

    30

    trends carried out by MPD operator

  • Risks of MPD &C

    DrillingwithMPDSurfaceBackPressure

    Controls in place

    Loss of back pressureor circulation FluidDensity

    +Friction

    g

    Well will gounderbalance

    +backpressure

    underbalance Influx may be taken Well

    DepthControls:

    Redundancy of circulating equipment

    Depth

    Staticweight:circulating equipment Two chokes in choke

    manifold

    Fluiddensity

    Pressure

  • Risks of MPD &C

    Plugging of surface equipment

    Controls in place

    Controls: Built in redundancy

    Flushing points

    6Fl li

    4ChokeManifold 6linesbackto

    shakers

    3218Marine

    Riser

    Flowlines shakers

  • Rewards of MPD

    Thisisis toScale!!

    Early Kick DetectionScale!!

    People

    Assets

    Environment

    33

  • MPD HistoryRig Name Rig Type Location Customer Year Application Status

    Trident 8 Jack Up Cabinda