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OptaSense Wins Industry First Contract for Multi-Well 4D Distributed Vertical Seismic Profile

February 13, 2014

LONDON, February 13, 2014 /PRNewswire/ –

OptaSense, the global leader in Distributed Acoustic Sensing (DAS), has contracted
with Petroleum Development Oman (PDO) to provide the industry’s first multi-well 4D DAS
vertical seismic profiling (VSP) system.

OptaSense will deploy its industry proven DAS fibre-optic technology to monitor and
map the performance of up to 12 steam-injected oil wells in a brownfield development at
South Oman Salt Basin. The service contract for time-lapse measurements is for three
years, with a further two optional years and scalable scope of work, for deployment in
multiple production settings.

Salim Rawahi, PDO GeoSolutions Manager said: “We see this as a start of deployment of
DAS technology in different reservoir monitoring programmes in PDO ranging from 4D, micro
seismic to fluid flow measurements. The versatility of the fibre-optic technology will not
only provide us with potentially more accurate data in different hostile subsurface
environment, but will also provide us with a means of measuring different reservoir and
fluid properties simultaneously.”

OptaSense will record seismic signals from fibre-optic cables attached to each well’s
production tubing, permanently installed and linked to a surface data gathering centre.
The final processed data set will be integrated into PDOs reservoir models, and assist in
the determination of fluid substitution through production and hence contribute towards
the positioning of infill wells.

Vertical Seismic Profiling (VSP) in 3D is a recognised alternative to surface seismic
data acquisition in challenging environments of accurate subsurface imaging. Weighed
against the use of geophones, OptaSense’s DAS technology provides benefits in 3D VSP which
include:

– Low-cost on-demand acquisition: permanent cable installation allows VSP delivery at
any time significantly simplifying time-lapse measurements

– Non intrusive: slim line cables can be deployed in wells inaccessible to geophones,
with no well intervention required once the fibre-optic cable is installed

– Synergies with other systems and retrofitting capabilities: existing fibre-optic
cabling can be used for VSP

– Full vertical coverage: the DAS cable extends over the entire length of a well,
allowing for increased lateral imaging

– Simultaneous VSP acquisition of multiple contiguous wells, without the need to
repeat surface source effort.

OptaSense Managing Director Magnus McEwen-King said: “This contract is a key milestone
for OptaSense and for the acceptance of DAS as a highly accurate, cost effective solution
in seismic monitoring. Above all it represents a breakthrough to enhanced oil recovery,
where well infrastructure can create significant challenges to surface seismic data
capture and geophones provide only limited well cover. In this situation, only DAS-VSP is
capable of delivering a field-scale commercial application by providing accurate coverage
of multiple wells.”

– Andrew Bradshaw, Fifth Ring – Andrew@fifthring.com +44(0)1224-626288

– QinetiQ Press Office – pressoffice@qinetiq.com / +44(0)1252-39-3500

SOURCE QinetiQ


Source: PR Newswire



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