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Equinor Enhances Permanent Seismic Monitoring With Sonardyne Sensors

Source: www.gulfoilandgas.com 2/26/2019, Location: Europe

Norwegian energy firm Equinor is to deploy cabled subsea instrumentation from Sonardyne International Ltd. to help increase the accuracy of time-lapse seismic data at the giant Johan Sverdrup oil field.

From first production at the development, Equinor plans to use seafloor based seismic cable permanent reservoir monitoring (PRM) technology to observe what is happening in the reservoir over time to help maximise recovery rates.

While PRM technologies increase the amount and quality of data that operators have about their reservoirs, processing it can sometimes be complicated by changing environmental conditions, such as water velocity and tidal height, at the time each survey is conducted. If those conditions are known, their impact can be readily removed.

To solve this challenge, Equinor has engaged subsea services contractor Subsea 7 to install a Sonardyne Pressure Inverted Echo Sounder (PIES) at 110 – 120 metre water depth at Johan Sverdrup. PIES instruments continuously measure the two-way travel time of sound waves propagated through the water column from the seabed to the sea surface as well as the pressure (depth) at the seabed. This data is then used to calculate a continuous time history of average water velocity and tidal variation throughout the whole water column.

While PIES instruments are already very widely used in marine seismic survey operations, this will be only the second time where PIES units are hardwired into topside power and communication infrastructure, which means Equinor will have instant and continuous access to their data. Conventionally, PIES data is collected acoustically by a passing surface vessel, including unmanned surface vessels.

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Related Categories: Consultancy  Engineering  FEED  General  Maintenance and Repair  Process Technology Licensing  Production Engineering  Project & Resource Management 

Related Articles: Consultancy  Engineering  FEED  General  Maintenance and Repair  Process Technology Licensing  Production Engineering  Project & Resource Management 


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