Development of an intelligent economic model to optimize the initiation time of gas lift operation

Shahdad Ghassemzadeh*, Peyman Pourafshary

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Gas lift technology increases oil production rate by injection of compressed gas into the lower section of tubing through the casing–tubing annulus and an orifice installed on the tubing string. To achieve optimum recovery, operation must begin at the optimum time, in addition to inject optimum gas rate. In this work, we develop a new approach to consider the time factor in the gas lift optimization process. A piecewise cubic Hermite function is used to model the gas lift performance. The optimization procedure for gas allocation to several wells is achieved using the Genetic algorithm approach. The developed model was used to study the effect of gas lift initiation time on the reservoir life and net present value. Our calculations showed that the initiation time has a noticeable influence on the optimization procedure and should be considered a major factor for gas allocation problems in real fields.

Original languageEnglish
Pages (from-to)315-320
Number of pages6
JournalJournal of Petroleum Exploration and Production Technology
Issue number3
Publication statusPublished - Sept 19 2015


  • Discount rate
  • Gas lift optimization
  • Genetic algorithm
  • Mathematical model
  • NPV

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • General Energy


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