Subsea Positioning In deep water

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1 Subsea Positioning In deep water PETRONAS - PETRAD - INTSOK CCOP DEEPWATER SUBSEA TIE-BACK Damai Puri Resort & Spa, Kuching, Sarawak, MALAYSIA 24TH - 26TH January, 2011

2 Supplier to the oil & gas industry Providing survey and positioning services Experienced offshore surveyors High quality and proven technical solutions Supporting projects worldwide Offices in Singapore and Norway

3 Rig and FPSO Operations Marine construction work

4 Experienced project managers and offshore staff Multi beam services for As-Laid Pipe and cable survey Complete solutions for subsea positioning support

5 Contents Subsea Positioning methods Ultra Short Base Line (USBL) Systems Long Base Line (LBL) Inertial Navigation Systems (INS) LBL operations Planning Deployment and calibration Operations Project Experience Ormen Lange Field development, Norway MA D6 Field development, India

6 Subsea Positioning methods Most systems are based on acoustic or a combination with acoustic. Two main principles used: USBL Range, angle and bearing from a fixed transducer (on a vessel or rig) to a transponder. LBL Range from fixed transponders (on the seabed) to a Transducer or Transponder

7 USBL Accuracy: Typical % of slant range. Advantages: Most Construction vessels, Rigs (semi) and many anchor Handling Tugs have USBL systems installed. No time consuming deployment or calibration of seabed transponders. Disadvantages: Accuracy in deep water Update rate in deep water

8 LBL Accuracy: Typical better than 0.1m relative accuracy (depth independent) Advantages: Accuracy in deep water Update rate in deep water (from ROV) Fixed reference for all users Disadvantages: Time consuming to deploy and calibrate

9 INS Acoustic and Inertial positioning principles in combination is ideal, since they have complementary qualities. Acoustic positioning is characterised by relatively high and evenly distributed noise and no drift in the position, whilst inertial positioning has very low short-term noise and relatively large drift in the position over time. Accuracy: Dependent on guiding sensor (USBL/LBL, DVL. IMU)

10 LBL Operations Planning Experience with LBL and subsea positioning operations over years have shown that the planning phase is essential in saving time and cost during the offshore phase. isurvey has over the years developed a systematical approach to the planning of LBL networks. The planning consists of the following phases: Identification of requirements Abosulte/Relative positioning accuracy requirements Attitude requirements Coverage requirements Update rate requirements Instrumentation on structures Detailed network planning Coverage analysis Accuracy analysis

11 LBL Operations Planning Coverage analysis The basis for the coverage analysis is to ensure that the planned transponder locations has both the sufficient coverage for the calibration operations and for the tracking operations Bakground information on the enviromental condition (sound velocity profile), Noise level on ROV and/or vessel is used to calculate expected range limitation. isurvey are using ArcGIS for the coverage analysis. Based on a Digital Terrain Model of the seabed (and structures), transponder and stand data (height above the seabed), a visual coverage map is produced.

12 LBL Operations Planning Coverage analysis (connt) Sound velocity analysis (Raytrace)

13 LBL Operations Planning Coverage analysis (connt) Sound velocity analysis (Transmission Loss)

14 LBL Operations Planning Coverage analysis (connt) Viewshed analysis (ArcGis)

15 LBL Operations Planning Coverage analysis (cont) Viewshed 2m

16 LBL Operations Planning Coverage analysis (cont) Viewshed 5m

17 LBL Operations Planning Coverage analysis (cont) Viewshed 10m

18 LBL Operations Planning Coverage analysis (cont) Viewshed 15m

19 LBL Operations Planning Coverage analysis (cont) Multiviewshed (for tracking)

20 LBL Operations Planning Accuracy analysis The accuracy analysis is performed with the survey adjustment software MOVE3. Based on experience, uncertainty figures are used in the calculations to give as close to real life results as possible.

21 LBL Operations Planning Accuracy analysis The accuracy analysis is performed with the survey adjustment software MOVE3. Based on experience, uncertainty figures are used in the calculations to give as close to real life results as possible. Expected accuracy both for calibration and tracking are calculated

22 LBL Operations Deployment and Calibration Transponder stands Several types can be supplied, depending on requirments

23 LBL Operations Deployment and Calibration Calibration Based on the planning data, a minimum of baseline measurements, Box In etc. can be performed Saving vessel time

24 LBL Operations Operations To optimise offshore operations: Detailed SOW for both the deployment and calibration are prepared, (the level of details down to specifying each baseline that should be measured). The SOW also included guidelines. Processing and adjustments done onshore, only data collection offshore. QC of data both onshore and offshore Detailed background data made available for the offshore vessel. All the data; DTM, routes, proposed transponder locations, view sheds, error ellipses etc. was collected in ArcGis and exported to the free ArcReader format.

25 Project Experience Ormen Lange Field Development isurvey AS was contracted by Statoil to do the planning of the LBL networks at the Ormen Lange field development isurvey AS also supported the offshore operations with personnel to support the installation and operations of the LBL networks during the installation activities during the same period. More than 200 transponders deployed and calibrated More than 30 LBL networks Water depth m

26 Project Experience Ormen Lange Field Development

27 Pressure Project Experience Ormen Lange Field Development Sound Velocity (m/s) Experience showed that focus should be on the following issues: Sound velocity control and modelling Terrain 250 (visibility) Sound Velocity Profiles E03 area Noise level (on vessel and ROV s) Operator experience level Strengthening 600 planning

28 Project Experience MA D6 Field Development The Krishna Godavari MA-D6 field development is based on production to a turret-moored floating production, storage and offloading vessel (FPSO) from the subsea production systems. These components are interconnected through a combination of umbilicals, risers and flowlines. The field is located in a water depth of between 1100m and 1400m and approximately 60 km offshore of Kakinada on the east coast of India

29 Project Experience MA D6 Field Development The survey scope of work to be undertaken includes the following tasks: - Dimensional control of suction anchors and manifold structure - Installation and calibration of Survey Positioning System Check stations - Mobilisation of survey and positioning equipment - Alongside calibrations and wet testing of equipment - Deep water wet tests during transit to field - Survey and positioning system calibrations on field arrival - LBL array installation and calibrations - Installation of marker buoy(s) for structure deployment - Pre-installation survey of mooring line corridors, suction anchor locations and manifold structure location - Installation support and monitoring during operations - Vessel and ROV positioning - As Built Surveys - Recovery of LBL arrays

30 Project Experience MA D6 Field Development 4 sub network designed Total number of 43 transponders deployed and calibrated.

31 Project Experience MA D6 Field Development Extensive planning saved offshore time Experienced operators offshore that can do the required operational adjustments Onshore processing, less workload on offshore personnel. (Processing done onshore in Norway) Logistic and spare part needs consideration and detailed planning when operating in certain regions.

32 Subsea Positioning in Deep Water Thank you! Questions?

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