Zilift, a developer of permanent magnet technologies for innovative artificial lift applications for the energy sector, has successfully achieved the installation, operation and retrieval of a slim-line cable deployed electrical submersible pump (ESP), under live well conditions.
The installation of an ESP, deployable through 3.5in tubing, was conducted in a Californian well during November and included full wellhead termination and pump operation.
In many parts of the world rig costs are the single most significant factor in downhole pumping economics, particularly offshore. Further, rigs are rarely available as an ESP fails, which results in scheduling conflicts between important drilling programs and restoring production from the failed ESP well. Often this results in months of lost (deferred) production.
In concluding this trial, Zilift has demonstrated that rigs are no longer an essential component in ESP operations thereby saving the rig cost and largely eliminating postponed production. This presents the industry with an opportunity for significant life cycle cost reductions.
“For operators to regain profitability in this challenging oil price environment, the only route forward is the application of new methods and technology which can fundamentally reduce the industry’s cost base and the capacity to cable deploy ESP’s offers just that,” said Norman Liley, commercial and IP director, Zilift.
This achievement builds on an earlier trial conducted in Oklahoma which demonstrated that a slim-line ESP can be deployed through standard pressure control equipment using low cost, widely available deployment equipment. By showing that a combined power and deployment cable, which remains within the production flowpath, can be successfully interfaced with a wellhead using a combined hanger and electrical feed-through, this most recent trial completes the exercise.
The installation was connected to its variable frequency drive and after commissioning, the pump was operated at various speeds confirmed by on-board data acquisition.
“Additionally, Zilift successfully re-connected to the deployment cable and retrieved the complete system to surface - all under live well conditions,” said Mike Rushby, SpeedDrive business unit manager, Zilift. The significance of these achievements cannot be overstated - the industry has sought this type of solution for decades – it’s the ‘holy grail’ for powered artificial lift systems.”
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