Addressing a challenging deepwater permanent abandonment operation in the Gulf of America (GOA), Oilfield Service Professionals (OSP), along with Lee Energy Systems (LES), initiated the PerfPro Perf & Squeeze method to overcome the limitations that arise out of mechanical blowout preventer (BOP), posing an obstacle to conventional cut-and-pull operations for the 14.15” casing string. In case explosive perforative guns needed deployment, a lot of uncertainty centred marred casing centralisation, giving rise to potential risks of unintentional perforation across multiple casing strings.
There were also other challenges concerning high-risk lower marine riser package (LMRP) interventions, which could introduce debris into the well, leading to costly extended work scopes.
The Bureau of Safety and Environmental Enforcement-approved PerfPro Perf & Squeeze method offered an innovative low-risk solution to these challenges. The single-trip Perf & Squeeze method was implement by OSP and LES to leverage its safer, faster, and cost-effective alternative to conventional approaches. The package comprised NEXUS High-Pressure/High-Tensile Packer, Gator Perforator, CatchPro Dart/Ball Catcher, and BarrierPro Hydra-Set Bridge Plug with Scraper System.
The PerfPro Perf & Squeeze method altogether eliminated the need for LMRP intervention, leaving the potential well debris issues out of the question. Without the rig, more than 24 hours were saved in terms of downtime. The method provides assurance against explosive perforating guns to avoid unknown casing centralisation. It ensures access to the 14" x 22” annulus above the 16” TOL, enabling placement and verification of two critical zonal isolation barriers. It executed rapid planning, testing, and deployment, including a pre-job perforation test on 14.15” casing to confirm operational feasibility.
The PerfPro Perf & Squeeze approach saved operators more than US$1mn in operational cost savings while enhancing safety and efficiency . It has the potential to redefine primary P&A approaches.
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