Water Coning Simulation Mode in Fractured Gas Reservoir with Bottom Water

There are two percolation models, horizontal radial flow above perforation interval, and semispherical centripetal flow below perforation interval. Based on this models and the theory of percolation flow through porous media, a study on prediction of water breakthrough time in fractured gas reservoir with bottom water is presented. Through mathematical calculations, a formula to determine the time of water breakthrough in fractured gas reservoir with bottom water wells is derived. Case study indicates that water breakthrough time decreases with the fracture development index. With increase of perforated degree, water breakthrough time increase first and then decreased after a critical value, which could be considered as optimum perforation degree. If the perforated degree is fixed, the water breakthrough time is directly proportional to the thickness of the gas reservoir and inversely proportional to the gas production rate.