Case Study

A big uncertainty and challenge for the project was whether annular remediation would be required. During assessment of wells, it was identified that the annuli was most likely partially cemented, and the Jet-based PWC® HydraHemera System was chosen over cut & pull and section milling.

The scope also changed when an unexpected hurdle of additional plugs were added to the original campaign due to actual well conditions.

Technical complexity posed challenges as three plugs were located in shallow zones, making the operation challenging with regards to cementing operations, requiring innovative problem-solving and flexibility.

Formed in 2015, WellGear B.V. is a leading global well intervention and decommissioning company. Head-quartered in The Netherlands, WellGear works collaboratively with HydraWell’s team of decommissioning specialists on several projects to deliver complex onshore and offshore operations.

Partnering with HydraWell, this campaign marked a pioneering onshore initiative to Plug & Abandon (P&A) three wells in an onshore gas storage field. This involved the installation of multiple PWC® plugs. Computational Fluid Dynamics (CFD) modelling played an important role in tailoring the HydraHemera™ system for deployment. CFD is now a well-developed methodology using computing analysis to examine and simulate solutions that involve fluid flow, -movement and –concentration. This technique helps deepen the understanding of fluid interactions that occur when using the PWC® technique.