Injection restored to a zone that had fallen to zero

Key results

• Run on E-Line
• 90% water production return
• Injection zone treated effectively
• 40% of the zone’s original production value was restored

Challenge

The primary oil producing zone of the well of a major operator was converted to water injection (dump flood) but the injection rate had fallen over time to zero. It was thought that fines were likely causing Skin damage. A re-perf was done 2 years earlier but did not result in any improvement. In addition, aquifer zones in the same wellbore were now producing at less than 20% of their original water rate.

• Depth: 1,500 m (4,900 ft)
• Temperature: 90 °C (194 °F)

Solution

Improve connectivity to the reservoir by clearing out blockages using electro-hydraulic stimulation technology.

• The slimhole 212 BLUESPARK® tool was deployed on 3rd party wireline through tubing into the wellbore.
• BLUESPARK® stimulation was carried out, treating 17 m (56 ft) of perforations.
• The well was put back on injection.
• An MPLT was logged to confirm the flow rates.

Outcome

• BLUESPARK® stimulation was successful in treating the aquifer zones, returning the water production to over 90% of its original value.
• BLUESPARK® stimulation was also successful in treating the injection zone, which at 40° deviation could not effectively be treated by re-perforating due to the proximity to the end of the tubing.
• The injection zone, which had never taken fluid, was now taking fluid at 40% of it’s original production value.