Since 2016, Radial Casing Solutions (Radial) has been developing a revolutionary and patented casing expansion tool we call REED: Radial Elastomer Expansion Device. By expanding the casing under forces controlled from surface, REED uses the casing itself to resolve wellbore integrity issues in the casing annulus without damaging the casing. For the first time, operators can materially reduce the cross-sectional area and change the behavior and characteristics of the casing annulus without perforating and/or injecting sealants. This retains casing integrity while resolving complex wellbore-integrity issues such as Surface Casing Vent Flow (SCVF) or interzonal communication of liquids or gases. Radial’s REED has sufficient power to expand most common sizes, grades and weights of casing, and can easily be adapted or customized for the most challenging assignments. Since 2020, dozens of jobs and hundreds of expansions have been conducted without a tool failure or inability to retrieve the REED from the well post-expansion.