Abstract: The production of the wells in well group Mimosa-4 of Mimosa4 block of Borger Basin in Chad is very low due to reservoir damage while drilling and completion. Acidizing is most wildly applied and successful technology to remove practical plug in sand reservoir and increase production. But it cannot be applied in Chad for the import restriction of fluid acid. While the physical plugging remove technologies shows no satisfying results, Solid acid system is proposed in the paper to remove reservoir plugging in the well group and the formula is suggested based on laboratory experiments.