Abstract This paper highlights the limitations faced along with the respective solutions proposed and executed during the plug and abandonment of a highly permeable and stimulated carbonate gas reservoir during its exploration phase after having performed an extended pressure buildup (PBU) test. To accurately compute the hydrocarbon reserves of a particular region and determine future field development, operators need to explore new reservoirs in both offshore and onshore challenging environments. The services performed on these wells include drill-stem test (DST) completion, underbalance perforation, acid stimulation, placing downhole gauges/shut-in tools, extended flowback/PBU periods, and final zonal isolation. In this candidate well, the operator wanted to test three zones, further performing high-rate acid fracturing on the lower two zones to determine commercial hydrocarbon gas rates. The first major challenge was the zonal isolation of the lower-most zone. A cement plug was designed to be deployed by means of coiled tubing (CT) for accurate placement and depth control. The added challenge in this exploratory well was to plug any wellbore channels and permeable fractured streaks after acid stimulation while preventing excessive cement fluid loss. This paper explains the innovative solution that was custom-designed for this well and the execution procedure. It also elaborates on the combined use of CT intervention, custom-designed chemical blends, a cement slurry system, and implementation of best practices to achieve successful zonal abandonment. The operation consisted of three runs: the first included a batch of an organically crosslinked polymer with loss circulation material (LCM) in the solution; the second was a cleanout operation and displacement followed by permanent cement slurry placement; and, after waiting on cement (WOC), the third run was performed to tag the top of cement (TOC) and test the integrity of the cement plug. The organically crosslinked polymer with LCM solids served to bridge off the perforation tunnels and potential fractures in the rock so that a precise volume of cement plug slurry could be pumped safely and accurately.