Dynamic production characteristics and effect analysis of combined gas production well of coalbed methane and tight gas

Abstract For gas reservoirs with poor physical properties, the implementation of a single well multi-layer combined production is an effective means to achieve efficient development. However, because differences in geological conditions vast majority reservoirs, dynamic characteristics wells will be complex under mining mode, and inevitable interlayer interference process affect development effect. In this paper, coal seam dense layer are opened for at same time. The two kinds different types not only restricted by heterogeneity each layer, but also special mode seam. Through analyzing summarizing productivity equation layers change pressure, coupling calculation carried out iterative programming node analysis method wellbore, which can dynamically predict production. comparison dynamics overlay it found that amount accumulated multiple forecast period 2.56% lower than multi-production investment cost far production, stable time longer, indicating longer.