A New Real-Time Monitoring Method for Sandstone Reservoirs' Acidizing

Abstract

Abstract Real-Time monitoring of the acidizing process has been shown to be an effective method to improve matrix acidizing treatment and acid volume should be used, and to evaluate the effect of acidizing. As is well known, the basic principle of Real-Time monitoring is monitoring the change of skin factor. However, conventional Real-Time monitoring technique is based upon the measurement of the injection rate and pressure(either surface or bottomhole) during an acid treatment to estimate the change of the skin factor and evaluate the effect of acidizing. While, based on existing techniques, this paper presents a new Real-Time monitoring method which can obtain the change of skin factor by calculating the evolution of permeability and the acid effective penetration diatance during acidizing treatment. The paper also chooses an appropriate Mathematical Model fitting sandstone reservoirs, and then illustrates how to calculate the change of permeability, the acid effective penetration distance and the skin factor. Additionally, this paper develops corresponding program and performs an actual calculation. Results from this calculation agree well with the real case and demonstrate that this method is also an effective Real-Time monitoring technique. Conclusions drawed from this paper suggest this new technique is feasible.