A day in the life of a Rig Move Surveyor

MarineSafe Forum

Phil Wells

18th August 2016

What does a Rig Move Surveyor do?

On rigs the Hydrographic Surveyor supports rig move and subsea structure installation operationsIn Australia typically on semi-submersible and jack-up rigs

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Ensco 5006

Tom Prosser

What is end result?

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For a jack-up it may be the rig jacked up adjacent to a platform and skidded out over the right slot

What is end result?

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For a semi-sub it may be anchors and mooring lines clear of assets

What’s needed to achieve end result?

Existing platform or subsea structure information

Rig information (size, shape, and detailed drawings)

Seabed information (depth, seabed properties for leg penetration or anchor holding)

Anchor and Mooring line components

Mooring Analysis

Rig Move Procedure – typically compiled by from the rig operator’s marine contractor

Rig Move Surveyor turns all this information into maps -Picture tells a thousand words

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The jack-up rig move story board

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Plan for the right well slot(s)

The jack-up rig move story board

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Catenary planning

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Catenary planning

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QC – is platform where we think it is?

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Proximity to subsea assets

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Check and re-check prior to pre-load

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Why is height important?

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Access to platform

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How to get it to right height

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Spot-on

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Semi-sub anchor sequence

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Semi-sub anchor sequence

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Telemetry is important

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Rigs and towing or anchor handing vessels all need to see the same thing

What’s a survey system look like on the rig?

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What’s a survey system look like on the boat?

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Real time 3D Catenary

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Following a incident in 2013 operators the perception of value of centenary monitoring increased

Real time 3D Catenary

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• Parameters need to be perfect• Access to AHT and rig systems• Accuracy of existing systems • More planning time required

3D Catenary data flow

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Bathymetry (Site Survey)

Infrastructure(As-built Survey)

Mooring Analysis Data

QC & Prep(incl Client & Marine Rep)

3D Catenary System

3D Models(Seabed and structures)

Neptune Mooring Plan

2D NavigationRig & Tug Winch

Data

Onshore

Offshore

Anchor Sequence Planning

Rig & Tug Wire/Chain Data

SIMOPS support – value of planning

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