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An operator working in the North Sea was abandoning one of their suspended wells, which required removing annuli well fluids and placing a final surface cement plug across all annuli prior to cutting and removing the wellhead.

After being contacted for a cost-effective solution to perform these plug and abandonment operations, Baker Hughes, a GE company (BHGE), proposed the wellhead abandonment straddle packer (WASP) system, followed by an abrasive cutting tool to complete the operation from a light well intervention vessel (LWIV). This would provide the operator with large financial savings compared to a rig-based solution.

Collaborative success

This BHGE solution required an integrated approach, pulling team members from multiple disciplines including wellbore intervention, tubingconveyed perforating, and cementing. BHGE project managers lead the operation, working closely with the LWIV and wellhead cutting third-party vendors to provide an integrated solution. Early customer engagement and planning was crucial to the success of the operation. BHGE collaborated with all parties to improve efficiency and reduce risks by limiting operational time at the well location.

After the well was prepared for entry, the operator ran a scraper and dummy perforating gun assembly to confirm the packer setting depths were clear of debris and the lower perforating guns could reach the targeted depth.

Download the PDF to read the full case study.

Challenges & Results
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Challenges

  • Insufficient well history
  • No recent interventions on the well
  • Multiple services and providers required on a tight project timeline

Results

  • Delivered an integrated well abandonment solution that adhered to UK oil and gas guidelines
  • Completed the operation 3 days ahead of the 8-day schedule
  • Saved time with the WASP single-trip system
  • Saved 30% on daily rates by using an LWIV instead of a rig
  • Reduced footprint and costs by sharing equipment across vendor teams