Safety valve reactivated after two failed interventions

Key results

• Conventional methods not working
• Less than 24 hours total treatment time
• SSSV reactivated successfully

Challenge

During a routine test, a major operator determined that a Sub-Surface Safety Valve (SSSV) would not successfully perform a routine inflow pressure test due to calcium carbonate scale (CaCO3).

Two separate interventions were attempted using conventional chemical and mechanical methods, but these failed to re-activate the SSSV. The operator then decided to mobilise BLUESPARK® technology, with its ability to remove scale from complex downhole completion equipment items, without risking any damage to them.

• Offshore Platform
• Wireline Deployment
• Depth: (564 m) 1,850 feet
• Temp: 42°C (108 °F)

Solution

Return a critical barrier to an oil producer in the Danish sector of the North Sea using electro-hydraulic pulsing technology.

• BLUESPARK® service was mobilised at short notice and run on third party wireline.
• Service required no chemicals, explosives or controlled goods.
• 3m (10feet) interval across the SSSV was treated with BLUESPARK®, removing the CaCO3 scale.
• Total operating time was less than 24 hours.
• SSSV was success fully activated and in flow pressure tested.
• Well was handed back to Production.

Outcome

• Blue Spark Energy successfully performed its first Sub-Surface Safety Valve (SSSV) re-activation in the Danish North Sea using our innovative BLUESPARK® technology.
• Demonstrated ability to selectively remove scale over sections of the tubing, verified by Caliper logs.
• Effective for NUI (normally unmanned installations) with small footprints and challenging lifting restrictions.
• After BlueSpark, the well returned to fully compliant integrity status, without the requirement for a workover, saving time and cost.