NASNet Operational Experience - Operational Experience FRADE Project, ... The water depth at the FPSO is 1000 meters to 1400 at ... Lessons Learnt

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    NASNet Operational ExperienceFRADE Project, BrazilHydrographic Society in Scotland

    23rd April 2009

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    North America and Mexico (NAMEX)

    Regional Profile

    Operating in the Gulf of Mexico and the Caribbean, undertaking a range of construction and installation engineering services.

    NAMEX divides its current business into 3 principal areas of operation:

    Subsea Umbilical Risers and Flowlines (SURF)

    Inspection and Maintenance and Repair (IMR)

    Conventional Field Development and Trunk lines

    The NAMEX region is focused on and ready for deepwater SURF projects and IMR

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    Frade ProjectCampos Basin Brasil

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    DTM Brazilian Continental Shelf

    FRADE

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    Frade field developmentThe Frade field is 6 Km x 4 KmThe water depth at the FPSO is 1000 meters to 1400 at the East extent of the field 8 Gas I/E Pipeline from the FPSO to termination 41Km SW in water depth 130 meters PRA1 PLEM Acergy Installed

    The development consists of :22 Riser Anchor Piles17 Production Flow Lines9 Gas Lift Lines10 Water Injection Lines 17 UmbilicalsFlexible Jumpers, Flying leads

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    Frade Develpoment field layout

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    Typical well site

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    LBL RequirementsProvide LBL coverage over the entire construction area with an relative accuracy of

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    NASNet

    Advantage - Disadvantage

    Fewer stations to deploy and calibrate savings in vessel time

    Reduced calibration time savings in vessel time

    Simplified array management

    Reduced O/P power levels Longevity of operating time with Lithium battery packs

    Quicker update rate of position

    New and untried technology with no commercial experience

    Vessel modifications required to operate the NASNet system

    Software routines needed to be changed to make the system more effective

    Additional training of personnel to operate the system

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    Original Proposal

    System uses Acoustic Spread Spectrum TechnologyOperating principle is similar to GPS in that each station transmits information on a regular basisSignal includes accurate time, error correction and station informationUnlike Transponder systems where an interrogation signal has to be transmitted, NASNet receivers only have to listen

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    NASNet 8 Station Array

    WE LL C

    3TXCO3DB

    4TXCO2D

    OUS2

    GT-203A

    3RJS416

    1RJS366

    WELL C

    MUS2

    GT-220

    N5I1

    N5P1

    ODI1

    MDI1

    OUI1

    MUI2

    MUI1

    OUI2

    MDP1MDP2

    MUP4

    ODP1

    OUP1

    OUP3

    OUP2

    MUP2

    MUP1

    MUP3

    ODP3(NOTE 3)

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    NASNet Mini Station

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    NASNet Field proposed with 16 stations

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    Acoustic Challenges

    SVPPositive going sound velocity close to the seabed causing the acoustic signal to bend towards the surface

    TopographyThough the construction area has no great features there is a general slope from West to East of 3 with slope increasing in areas of the water injection loop to 5 -Because of this we get ground absorption up slope and the signal bending away down slope.

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    Acoustic Analysis Predicted cover 28 Stations

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    Acoustic Analysis Predicted cover 22 Stations

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    NASNet 22 Station Array with 6 Optional

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    Frade ProjectInitial DeploymentThe initial deployment was 8 stations to enable installation of the Riser Anchor Piles around the FPSO location.

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    Frade ProjectInitial DeploymentThe initial deployment was 8 stations to enable installation of the Riser Anchor Piles around the FPSO location.Each deployment and calibration was completed in 3 hours.

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    Frade ProjectInitial DeploymentThe initial deployment was 8 stations to enable installation of the Riser Anchor Piles around the FPSO location.Each deployment and calibration was completed in 3 hours.Position check after calibration on an existing wellhead

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    Frade ProjectInitial DeploymentThe initial deployment was 8 stations to enable installation of the Riser Anchor Piles around the FPSO location.Each deployment and calibration was completed in 3 hours.Position check after calibration on an existing wellheadSet a construction receiver on the seabed in the center of the array to monitor the integrity of the array

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    Frade ProjectInitial Deployment

    The initial deployment was 8 stations to enable installation of the Riser Anchor Piles around the FPSO location

    Each deployment and calibration was completed in 3 hours

    Position check after calibration on an existing wellhead

    Set a construction receiver on the seabed in the center of the array to monitor the integrity of the array

    Results of the calibration and confidence check

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    Eight Beacon Array Calibration and Confidence Check

    Object Easting Northing Range3TXC03DB 412772.00 7579292.00NASnet 412764.16 7579294.75

    Heading098 412766.23 7579294.59188 412764.86 7579294.10278 412764.59 7579296.77008 412766.32 7579294.38

    Med 412765.55 7579294.49Max 412766.32 7579296.77Min 412764.59 7579294.10Rng 1.73 2.67Std 0.90 1.22

    Diff. -1.39 0.27

    Well Diff. 7.84 -2.75 8.31 NASnetWell Diff. 6.46 0.27 6.46 HIPAP

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    Pre Lay Survey

    Deployment of the remaining Stations to complete the 22 station array

    Box in Calibration of the remaining stations

    Installed two additional Construction receivers across the field

    Conducted Pre lay survey of the Frade Development area

    Logged NASNet coverage over all the flow line routes and Well locations

    Checked the positions of the four existing wells

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    NASNet Installation - Normand Mermaid

    NASNet Surface Controller Gate Valve and Hoist

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    Installation Diagram

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    Deployment - 7 Meters above seabed

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    Construction Receiver on a modified MS Stand

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    MS Station Deployed Subsea

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    Existing WellsAUV-NASNet-SSBL

    2.8311.533.62513.725Difference

    7578109.2413943.57578108.4413941.375781124139554TXC02D

    -3.826.24-2.597.51Difference

    7579294.49412765.557579294.75412764.167579292.00412772.003TXCO3DB

    -2.12-0.42-2.35-1.71Difference

    7578926.12415641.427578926.35415642.7275789244156413RJS416

    2.50-5.093.48-5.38Difference

    7580613.5412979.17580612.5412979.475806164129741RJS366

    NorthingEastingNorthingEastingNorthingEasting

    HIPAPNASNetAUV SurveyWell #

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    Tracking comparison HiPAP USBL/NASNet

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    NASNet Position Solution CRx and ROV

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    Conclusions: System and Project Evaluation Summary

    Robust and stable positioning meeting specification expectations

    Uniform positioning regime over entire field

    Highly acceptable cycle time

    Simultaneous users True multi user system

    Improving / growing technical support

    Improving system technical reliability

    Joint planning and preparation is a must

    Difficult to establish multi user operating responsibilities unless managed by Client

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    Lessons LearntPlanning

    Seabed Topography and Velocity analysis

    TrainingOperator level & higher understanding of acoustic principles

    Support Develop a support & communications st