Well Interference Model of Multi-fractured Horizontal Wells Considering Non-uniform Fracture Conductivity in Fractured Porous Media

Strong interference has been observed due to small well spacing in the well pad of gas reservoirs, and the fracture properties significantly impact the interference degree. However, current well-test model hardly considers the interference among different multi-fractured horizontal wells (MFHWs) in the well pad and the fracture conductivity are assumed to be the same for different fractures. It would cause erroneous interpretation results for well interference and fracture properties using previous models. Thus, this paper presents a semi-analytical well interference model to better describe flow and mass transfer in fractured porous media by incorporating non-uniform fracture conductivity and interference from adjacent wells. The fractures contain two segments which covers difference values of half-length, production and conductivity. Eight flow regimes can be seen on the interference type curves, and interference can be observed obviously on pressure and its derivative curves during multi-well interference flow. Sensitivity analysis is conducted to analyze the effect of well spacing, fracture conductivity and production distribution on the pressure response. Finally, field application indicates that the proposed model can be used to analyze the well interference among MFHWs in fractured reservoirs, which further demonstrate the accuracy and advantages of the established interference-test model.