Geoscience Visual Presentation G05: Evolution of coal strength with dewatering and coal seam gas depletion: an integrated approach

Geoscience Visual Presentation G05 Understanding the response of coal mechanical properties to dewatering and gas depletion is critical for estimating borehole stability and designing infill coal seam gas (CSG) wells. Despite its importance, the full impact of these processes on coal strength remains little explored. This study aims to quantify these effects through a combination of results from micro-computed tomography (micro-CT) imaging, sonic testing, and mechanical testing on coal samples. Micro-CT imaging provides insights into coal’s internal structure by focusing on parameters such as fracture porosity and fracture intensity (P32 factor). Sonic testing measures dynamic properties, including P-wave and S-wave velocities (Vp and Vs) and dynamic Young’s modulus (Ed), under both dry and wet conditions. Mechanical testing with acoustic emission monitoring evaluates static properties like Young’s modulus (Es) and uniaxial compressive strength (UCS). The key findings follow: (i) micro-CT imaging shows a strong correlation between coal fracture porosity and P32, offering detailed insights into the coal microstructure; (ii) mechanical testing reveals that dry samples exhibit a 10% higher Es and 31% greater UCS than wet samples, suggesting that dewatering increases coal strength but potentially also promotes embrittlement; and (iii) wet samples show higher Vp and Ed in sonic tests, indicating water saturation significantly influences sonic measurements. These findings improve the understanding of dewatering and gas depletion effects, laying the groundwork for more advanced geomechanical models in CSG operations. To access the Visual Presentation click the link below. To read the full paper click here