Study on the optimization of fracturing parameters and interpretation of CBM fractured wells

Due to complex seepage mechanism and weak reservoir property, CBM requires being exploited by hydraulic fracturing. In order to comprehend the influencing laws of fracturing parameters' on productivity, recovery efficiency, and well network thoroughly, this paper establishes a non-linear gas-water percolation model of fractured wells. Stress deformations, fluid-structure interaction, CBM desorption, and diffusion research are done. On top of the above, injection pressure-drop well test method is adopted to evaluate fracturing effects. The result demonstrates that the reservoir porosity initially declines and subsequently rises. Permeability is non-linearly affected by threshold pressure gradient. Well space optimization involves fracture orientation, fracture penetration ratio, and fracture conductivity impacts. The rectangle and rhombus well pattern selection refers to reservoir anisotropy critical ratio. The injection pressure-drop test interpretation should be improved further due to the changes in wellbore liquid level. This study is of great significance to improve fracturing evaluation and parameters optimization.