Trinity Successfully Restarts Well with High Risk of ESP Failure | SLB
Case Study
Location
Trintes Field, Trinidad and Tobago, North America, Offshore
Details

Challenge: Restart a Trintes field well without causing an electrical or mechanical failure in the ESP, which would necessitate a well intervention operation.

Solution: Use LiftWatcher real-time surveillance service and technical support from Artificial Lift Surveillance Center (ALSC) team to preserve ESP integrity while restarting the well.

Results:

  • Successfully restarted well with no failures or well intervention.
  • Saved cost of intervention operation estimated to be USD 170,000.
Products Used

Trinity Successfully Restarts Well with High Risk of ESP Failure

LiftWatcher service helps preserve ESP integrity to avoid costly well intervention operation

ESP risks failure due to challenging well conditions after shutdown

In the Trintes field, Trinity Exploration & Production (Trinity) experienced an unexpected shutdown in one of its wells due to platform generator issues. After many restart attempts, the motor winding temperature increased rapidly, and high startup amperage consumption was causing the breaker to trip. The well had a high gas presence, and it was found that sand and solids were falling back in the pump and plugging the impellers, causing the amperage consumption and motor temperature to increase upon restart. The solids accumulation, temperature increase, and amperage consumption put the ESP at risk of failure, and replacing the ESP would require a costly and time-consuming well intervention operation.

ALSC deploys LiftWatcher service to troubleshoot and provide recommendations

The ALSC used LiftWatcher service during the troubleshooting operation to avoid any mechanical or electrical failure in the ESP. With startup constraints that included high amperage, high horsepower and torque consumption, and high temperatures, the surveillance optimization team sent a technical alert with the following recommendations to avoid any mechanical or electrical failure in the ESP:

While these actions were taken, the ALSC continued to monitor the BHA integrity and ESP function.

Well successfully restarted with no failure

After the technical recommendations were applied, the well successfully started up with no mechanical or electrical failure. The ESP's integrity was preserved, avoiding a well intervention that would have cost approximately USD 170,000.

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Though the well was challenging to start up due to high motor current consumption and a high number of previously unsuccessful startups, the recommendations made using the LiftWatcher service enabled the ESP’s integrity to be preserved.
"Schlumberger’s LiftWatcher service and personnel expertise were used in every step. This proved to be very useful in getting the well restarted and monitored." —Avinash Ramsingh, Head Office Petroleum Engineer, Trinity Exploration & Production
Products Used

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