Halliburton STIM2001™ simulation software, along with our carbonate and sandstone acid stimulation technologies, brings new levels of precision and costeffectiveness to acidizing. The STIM2001 software can evaluate the reasons for lost production in one well or a series of wells, and then rank the wells studied according to the best value for each stimulation dollar spent. Obtaining optimum results from any of the various formulations and procedures depends on a thorough understanding of formation mineralogy. The system can determine the wells’ skin value, the damage mechanisms in play, applicable remedies, and the ideal production rate. It can provide guidance for fluid selection, recommend fluid diversion programs, simulate fluid flows in both sandstone and carbonates (including wormholing), and automatically generate reports based upon single-entry data. STIM2001 matrix simulator is a solutions-oriented software package that can effectively guide matrix stimulation treatment selection. With a thorough understanding of formation mineralogy, formation fluids, and petrophysical properties, the system can optimize the stimulation treatment to help increase hydrocarbon production.