Optimized Matrix Acidizing Treatment Design to Enhance Well Productivity in Sandstone Reservoirs

Abstract

The use of matrix acidizing (mud acid) stimulation techniques to boost reservoir production rate is one of the primary goals of petroleum engineering program. A popular stimulation technique involves treating sandstone reservoirs with mud acid (HF and HCL) to reduce formation damage. The optimization procedure, however, receives little focus. In this work, an improved stimulation strategy is presented, and the effect of acid volume on productivity index, formation skin factor, and treated zone radius is assessed. From the results obtained in this study, it was discovered that altering the acid volume led to a noticeably greater increase in productivity index and acid treated zone with a decrease in formation skin factor. A petroleum engineering software PROSPER was utilized to design, optimize, and to assess the well performance both before and after acidizing. The software also utilized literature review data on production history. Additionally, the most effective amount of acid was pumped into the formation to reduce the formation skin factor while still retaining the tensile strength of the reservoir rock. When comparing the optimization findings, acid volumes of 500, 800, and 1000 gallons produced productivity indices of 5.3, 5.39, and 5.42 stb/d/psi, respectively, from a productivity index decline of 2stb/d/psi, which represents a considerable increase. Using mud acid concentrations of 5% HF and 15% HCl, the formation skin factor dropped linearly from the initial positive skin of 5 to -0.85