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Seepage characteristics of chemical grout flow in porous sandstone with a fracture under different temperature conditions

发布时间:2021-07-13 09:39:55浏览次数:155次

Seepage characteristics of chemical grout flow in porous sandstone with a fracture under different temperature conditions: An NMR based experimental investigation


In this study, the low-field nuclear magnetic resonance (NMR) testing technique was adopted to experimentally investigate the seepage processes of chemical grout flow in fractured rock under various temperatures and confining pressures. The variations in the NMR parameters, including the tested porosity, transverse relaxation time (T2) distribution and T2 peak area, were quantitatively analysed to study the seepage characteristics under different grouting conditions. The changes in the grout viscosity as a function of the temperature were studied. Then, the effects of injection pressures and temperatures on the seepage characteristics of porous sandstone with a single fracture and a constant confining pressure of 20 MPa were systematically investigated. The results indicated that the viscosity of the grout shows obvious time-dependent and temperature-dependent characteristics. The flow pattern of the grout is greatly dependent on the injection pressure, whereas it is less affected by the temperature. The permeability of the sandstone shows an increasing trend as the injection pressure increases and the temperature decreases.