Research and Patterns of Rock Acid Pressure Corrosion Tests

School of Civil Engineering and Architecture, Zhongyuan University of Technology, Zhengzhou 450007, China

^* Corresponding author e-mail: 1769341005@qq.com

Abstract

In China, tight sandstone gas reservoirs are widely distributed, yet their development is hindered by issues such as low extraction efficiency and a monotonous extraction approach. To enhance the efficiency of tight sandstone gas extraction, this study investigates the internal fracture network characteristics of sandstone and its correlation with chemical solutions. Employing the sandstone acid fracturing technique, an experimental setup under gravitational conditions is established. Through this apparatus, fracturing experiments are primarily conducted on rocks utilizing the acid fracturing technique. The experimental findings suggest that the acid-fracturing coupling approach effectively induces rock fracturing. Uniaxial compression tests also indicate a noticeable alteration in the elastic-plastic behavior of rock samples after chemical solution corrosion, becoming more pronounced with increasing duration. The research demonstrates that this experimental setup significantly enhances the fracturing of sandstone and consequently improves the extraction of tight sandstone gas, holding crucial reference value.