The Hassi R'Mel Field is a gas condensate reservoir with three Triassic sands (A-B-C) separated by a thick shale layer. Producing wells were drilled in the Northern-Central-Southern part with two lines of dry gas injection. A decrease in the production wells was observed. Build-up tests realized on those wells showed significant skin, which is due primarily to the excessive invasion mud used during drilling and workovers. A study was undertaken in order to see what method is to be used to optimize and improve the potential of these wells, which is less than hoped for given their petrophysic characteristics. Stimulation by acidizing was decided upon and three companies were selected to complete the program. During this program, 34 wells were acidized, which was carried out in three phases in order to diversify the methods. Of the 34 wells, 13 wells were chosen for the first phase, 13 wells for the second phase and the remaining eight wells were in the third phase. In order to study the stimulation's effects, PLTs were performed before and after each acidizing phase. The purpose of this paper is to show: The various methods of acidizing and the concentrations used in each of the three phases. Interpretations of the PLTs which enabled us to obtain flow layers, dynamic flowing pressure, static pressure, draw-down pressure and the productivity index in order to calculate the gain in production in each layer, the gain in production for each well and the flowing pressure. The combination of the PLT's results carried out on the acidized wells will be analyzed and shown in table form and graphs, which will enable us to draw a conclusion on the advantages and disadvantages of this stimulation program.