The aim of this work includes the listening of all facts, which are responsible for formation damage, further suggestions for the acid stimulations and the prevention of formation damage. In the first part of this thesis the theory of the formation damage problem and computational models, which are important for the reservoir formation characterization, is discussed. The investigation of the formation damage of the selected wells from the drilling process to the last workover program is analyzed. In addition the amount of the noticed fluid losses and the fluid itself are visualized in some diagrams. Acid stimulations are an important point of this thesis. The entire workflow of the decision up to the acid stimulation is described in detail and provided suggestions for improvement. The specification and evaluation of the acid stimulations are also described in more detail. In the Appendix, all well-specific data (gross rate, oil production, water cut, Gas-Oil-Ratio), all workover procedures and the production of the sediments are shown versus time. In addition, the outcomes of the acid stimulations are illustrated.