Expro Excellence
Wireless Well Solutions
Maximizing value of an appraisal DST using CaTS™ wireless gauges
Customer challenges
  • Our customer planned an appraisal well to improve the estimated ultimate recovery (EUR) of their reservoir
  • Reservoir connectivity is a key uncertainty that impacts field development decisions. Our customer wanted additional insight and data beyond a conventional DST, with minimal incremental cost
  • An objective for the test was to flow the wells at conditions analogous to a producing well, but standard test durations are insufficient to investigate the volumes that would be accessed under production conditions
  • Recoverable resources were dependant of demonstrating significant reservoir connectivity, however this was complicated by the geology
Expro Excellence
  • Expro installed 2 x CaTS™ gauges clamped onto the lower completion below a permanent packer
  • Another 2 CaTS™ gauges were installed inside the tailpipe on a plug below the packer
  • Four repeaters were installed below a bridge plug
  • Four ASMs were installed on a modified debris cap at the sea floor
  • Four discrete systems were run giving, four independent gauge measurements and multiple redundancy
Value to client
  • Use of wireless gauges allowed the pressure buildup duration to be extended from 3 days to 428 days
  • The higher-cost rig time was used for producing a larger pressure disturbance
  • The gauges allowed the resolution of the third and fourth reservoir boundaries (with outermost boundaries 15km from the well)
  • This well test strategy was able to investigate a similar reservoir volume to the planned development wells
  • The use of multiple gauges contributed to narrowing the range of uncertainty by allowing a tighter drift range in modelling
  • The results showed that the gas volume in the model was a significant overestimate of the actual gas volume
Contact

Maximizing value of an appraisal DST using CaTS™ wireless gauges

In Brief
Our CaTS gauges were used to monitor an extended pressure build-up post DST- where the data reduced uncertainties in the customer's gas volume model
Product Line
  • Wireless Well Solutions
Region
Asia-Pacific
Customer challenges
  • Our customer planned an appraisal well to improve the estimated ultimate recovery (EUR) of their reservoir
  • Reservoir connectivity is a key uncertainty that impacts field development decisions. Our customer wanted additional insight and data beyond a conventional DST, with minimal incremental cost
  • An objective for the test was to flow the wells at conditions analogous to a producing well, but standard test durations are insufficient to investigate the volumes that would be accessed under production conditions
  • Recoverable resources were dependant of demonstrating significant reservoir connectivity, however this was complicated by the geology
Expro Excellence
  • Expro installed 2 x CaTS™ gauges clamped onto the lower completion below a permanent packer
  • Another 2 CaTS™ gauges were installed inside the tailpipe on a plug below the packer
  • Four repeaters were installed below a bridge plug
  • Four ASMs were installed on a modified debris cap at the sea floor
  • Four discrete systems were run giving, four independent gauge measurements and multiple redundancy
Value to client
  • Use of wireless gauges allowed the pressure buildup duration to be extended from 3 days to 428 days
  • The higher-cost rig time was used for producing a larger pressure disturbance
  • The gauges allowed the resolution of the third and fourth reservoir boundaries (with outermost boundaries 15km from the well)
  • This well test strategy was able to investigate a similar reservoir volume to the planned development wells
  • The use of multiple gauges contributed to narrowing the range of uncertainty by allowing a tighter drift range in modelling
  • The results showed that the gas volume in the model was a significant overestimate of the actual gas volume
Contact

For further information, please contact:

wireless@expro.com