CaTS wireless monitoring technology allows for monitoring of abandoned wells, providing valuable reservoir data. During appraisal drilling, decisions must be made with limited data, increasing uncertainty around reservoir connectivity. CaTS sensors installed before well abandonment can monitor pressure and temperature for years, reducing uncertainty by detecting interference between producing and injection wells. This low-cost, wireless system transmits data to a seabed receiver without need for downhole cabling, avoiding integrity issues and simplifying permanent abandonment.

1. Home Wireless Well Solutions Products & Services
By the application of the CaTS wireless monitoring technology, well testing no longer has to
end at well abandonment.
During Exploration and Appraisal drilling campaigns, critical decisions regarding future field
development planning sometimes have to be taken based on very limited data sets.
Uncertainty regarding reservoir connectivity and compartmentalisation is one of the biggest
risks the operators have to contend with during any hydrocarbon prospect and field
development evaluation.
This uncertainty can be reduced by maximising the time spent on appraising the prospect, but
the pressure on minimising rig time and cost reduction often results in appraisal activity being
terminated prematurely. The value of reservoir data that leads to better decision making
regarding recovery factors and field development plans is substantial and CaTS Advanced
Reservoir Testing™ can help to provide this critical data.
CaTS can be installed into an appraisal well at the end of a drill stem test and used to monitor
the reservoir response, potentially for several years after well abandonment.
By using the abandoned appraisal well as a long term monitoring asset it is possible to record
any interference effects resulting from production or injection events in the adjacent field
area. This data provides very high value information about the reservoir continuity and
connected volumes between several remote well locations.
CaTS can also be applied in those situations where a long term pressure build-up (PBU) may
be required to accurately characterize the reservoir or to identify far boundaries; continuing to
accurately monitor the PBU for months or even years after the rig has departed the location.
Pressure and temperature data from a CaTS gauge located adjacent to the abandoned
Brian Champion
Global Sales Director
E: brian.champion@exprogroup.com
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Please find below a range of information and
solutions for our product line
About wireless well solutions
FlowCAT retrofit wireless safety valve
Advanced reservoir testing ™
DST SRO and data services
Monitoring
Downhole monitoring
Retrofit Real- time Wireless Monitoring
Well Integrity Monitoring
Advanced Reservoir Testing http://www.exprogroup.com/products-and-services/wireless-well-solut...
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2. reservoir zone is transmitted wirelessly to a seabed receiver, where it is stored locally. The
data is subsequently uploaded from the seabed receiver to a vessel passing overhead using
through-seawater communications. CaTS lends itself naturally to this abandoned well
monitoring application for several reasons, including:
There is no requirement for a tubing string or completion to be installed in the well,
minimising rig time and meaning that the well can be permanently abandoned with no
requirement to re-enter the well to recover the tubing and perform a final abandonment
CaTS signal transmission is not affected by cement plugs, bridge plugs or by cemented
pipe
CaTS can be installed into the well cost effectively using conventional wireline or coiled
tubing equipment and procedures
Any in-well cable arrangement represents a potential leak path; CaTS has no in-well
cabling meaning that the integrity of the well abandonment is not compromised
Advanced Reservoir Testing http://www.exprogroup.com/products-and-services/wireless-well-solut...
2 of 2 21/01/2015 21:14