--- title: "Case Study: Single and dual casing PWC® operations from hydraulic work-over unit" description: In collaboration with four major Oil & Gas Service Providers, Hydrawell flawlessly installed the first two PWC® plugs in the 7” x 9-5/8” annulus across the salt formation caprock using the HydraHemera™ single casing PWC® 1-trip system. image: https://blog.hydrawell.no/hubfs/Hubspot%20Case%20Study%20Oct%202020-1.jpg --- [![HydraWell home](https://blog.hydrawell.no/hs-fs/hubfs/hydrawell_logo_lockup_black.png?width=1920&height=522&name=hydrawell_logo_lockup_black.png "HydraWell home")](https://www.hydrawell.no) Search ## Case Study: Single and dual casing PWC® operations from hydraulic work-over unit ![](https://cdn2.hubspot.net/hubfs/2040891/Marketplace/WASABI/icons/icon-calendar.svg) *By Stein Ivar Haukelid - October 27, 2020* A major global operator with a growing portfolio of mature wells reaching the end of their lifecycle has commenced a substantial P&A campaign to permanently abandon these wells. However, several of the wells had insufficiently cemented annuli across the cap rock formations. Check out our latest case study, linked below, which outlines, in detail, how HydraWell worked in collaboration with four Oil & Gas service providers to install three PWC® plugs across a salt formation caprock using the HydraHemera™ PWC® system. --- [![Read the full Case Study](https://no-cache.hubspot.com/cta/default/4835018/939368ef-36d2-499d-a033-120685348f72.png)](https://cta-redirect.hubspot.com/cta/redirect/4835018/939368ef-36d2-499d-a033-120685348f72) ### Recent Posts Comments ### Sign Up for our Blog We promise that we won't SPAM you. #### [What's next?](https://www.hydrawell.no/) #### [Recent blogs](https://blog.hydrawell.no/) [![HydraWell secures a long-term contract with Dutch well specialist WellGear](https://blog.hydrawell.no/hubfs/HW%20Contract%20with%20WellGear_April2026.jpg) **HydraWell secures a long-term contract with Dutch well specialist WellGear** 21 April 2026 ](https://blog.hydrawell.no/news/hydrawell-secures-a-long-term-contract-with-dutch-well-specialist-wellgear) [![Perforate, Wash and Cement (PWC®) - CFD-Driven Validation with HydraHemera™](https://blog.hydrawell.no/hubfs/CFD%20Case%20study.png) **Perforate, Wash and Cement (PWC®) - CFD-Driven Validation with HydraHemera™** 27 January 2026 ](https://blog.hydrawell.no/news/perforate-wash-and-cement-pwc-cfd-driven-validation-with-hydrahemera) #### Subscribe Get the latest knowledge articles and news right into your inbox. #### Subscribe to Blog or News [![Subscribe](https://no-cache.hubspot.com/cta/default/4835018/d7232604-02c4-46a5-9009-b9d2e0a754a5.png)](https://cta-redirect.hubspot.com/cta/redirect/4835018/d7232604-02c4-46a5-9009-b9d2e0a754a5) #### [Contact us](https://www.hydrawell.no/contact-hydrawell) HydraWell (HQ) Norsea Base, Bygg 104, N-4056 Tananger, Norway #### [Privacy Policy](https://www.hydrawell.no/privacy-policy) All rights reserved | 2026 | © Hydra Well Intervention AS | Made by [Leadify](https://leadify.no)