New permeability model of deep coal rock considering the structure and 3D stress compression-induced anisotropy
Tóm tắt
Understanding the gas flow behavior in coal mining is conducive to the efficient production of coalbed methane. In coal mining, in-situ stress usually manifests as three-dimensional anisotropy in deep formations, and affects the gas permeability in reservoirs. In this work, a permeability model for anisotropic coal by combining gas sorption effects and the three-dimensional stress compression was proposed. Then, the effect of stress-induced fracture expansion on the fracture-matrix system was quantitatively analyzed, and this effect was incorporated into the permeability model. Combining the theoretical work, the seepage tests under conditions of true triaxial stress was conducted, and the permeability of coal, sandstone, and composite coal-rock were measured. Results showed that the stress first causes fracture compression, thus causing the permeability reduction. Because of the continuous increase of stress, the resulting fracture initiation and expansion increase the seepage channel of rock, and its permeability showed a sudden increase trend. In addition, the measured permeability test data is in good agreement with the model predicted. It also shows that the new model can describe the reservoir anisotropy permeability behaviors owing to stress compression induced damage and the initiation of new fractures. This work may provide an important theoretical reference for the evolution of rock permeability and reserve assessment of deep oil and gas reservoirs.
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