LAUSR

Abstract This study aims to obtain new coal-like materials based on the fluid-solid interaction of low-rank coals to investigate the hydraulic fracturing behavior of reservoir. Twenty sets of proportioning tests were carried out with cementing materials, aggregate, and auxiliary materials. The tests results show that the ratio of cementing material to aggregate (CM/A) and the ratio of quartz sand to coal powder (QS/CP) have significant regulatory effects on the physical and mechanical properties of coal like materials. When the ratio of CM/A is 1/2 and the ratio of QS/CP is 1/2–5/7, the mechanical and fluid-solid interaction properties of coal-like materials have optimum matching with those of low-rank coals. For further investigation, fracturing stimulation experiments were conducted. The fracturing responses of coal-like materials reveal the characteristics of fluid-solid interaction of low-rank coals under hydraulic fracturing, which provides a suitable material and method support for research on fracturing stimulation of low-rank coals reservoir.