Expro Excellence
Gas lift optimisation increases production on mature asset
Objectives
  • Mature multi-platform asset with 17 active wells (14 platform and three subsea)
  • Production network comprising three production pipelines, plus one gas lift and one gas export pipeline
  • Lift gas supply was perceived to be inadequate for current production conditions
  • A further threat was the future addition of four platform infill wells
  • Additional challenges included: determining how much gas lift was being directed to each well; uncertainty of individual well production due to infrequent well testing; no immediate scope to gather downhole data
Expro Excellence
  • Early focus given to a review of historical data (from the well intervention operations, reservoir engineering, projects and flow assurance studies) allowing robust well and system models to be produced - revealed a lift gas injection issue on one well which was resolved without intervention 
  • Smoothing out artificial lift inefficiencies allowed other issues, such as inflow performance, to be examined
  • Unsuitable well test information was screened out
  • A method proposed by the client to derive a lift gas metering calibration error was scrutinised and compared with two other developed methodologies; this resulte in an error correctins being implemented with confidence
  • A matched suite of nodal analysis well models and a surface network model were produced as part of an integrated production model (IPM)
  • Gas lift operations training was provided to offshore personnel in order to reinforce knowledge transfer
  • Collaborations with Expro's cased hole services team to provide a range of tools to help identify physical well integrity issues including corrosion, scale, deformation and leak detection
Value to client
  • Gas injection lift was optimised to yield an additional 900 STB/day
  • The IPM allowed key wells to be targeted for future intervention, and well testing schedules were optimised to allow asset production to be adequately monitored
  • The calibrated integrated production model allowed the onshore production team to provide reliable well rate potentials to the offshore production team: building trust
Contact

Gas lift optimisation increases production on mature asset

In Brief
Gas lift optimisation performed using simulation tools, nodal analysis and network modelling system techniques increases production
Capability
Production Optimisation
Objectives
  • Mature multi-platform asset with 17 active wells (14 platform and three subsea)
  • Production network comprising three production pipelines, plus one gas lift and one gas export pipeline
  • Lift gas supply was perceived to be inadequate for current production conditions
  • A further threat was the future addition of four platform infill wells
  • Additional challenges included: determining how much gas lift was being directed to each well; uncertainty of individual well production due to infrequent well testing; no immediate scope to gather downhole data
Expro Excellence
  • Early focus given to a review of historical data (from the well intervention operations, reservoir engineering, projects and flow assurance studies) allowing robust well and system models to be produced - revealed a lift gas injection issue on one well which was resolved without intervention 
  • Smoothing out artificial lift inefficiencies allowed other issues, such as inflow performance, to be examined
  • Unsuitable well test information was screened out
  • A method proposed by the client to derive a lift gas metering calibration error was scrutinised and compared with two other developed methodologies; this resulte in an error correctins being implemented with confidence
  • A matched suite of nodal analysis well models and a surface network model were produced as part of an integrated production model (IPM)
  • Gas lift operations training was provided to offshore personnel in order to reinforce knowledge transfer
  • Collaborations with Expro's cased hole services team to provide a range of tools to help identify physical well integrity issues including corrosion, scale, deformation and leak detection
Value to client
  • Gas injection lift was optimised to yield an additional 900 STB/day
  • The IPM allowed key wells to be targeted for future intervention, and well testing schedules were optimised to allow asset production to be adequately monitored
  • The calibrated integrated production model allowed the onshore production team to provide reliable well rate potentials to the offshore production team: building trust
Contact

For further information, please contact:

optimisation@exprogroup.com