Well Test Model for Double-Porosity Media Three-Zone Composite Reservoir Considering Interface Resistance

Because of the heterogeneity of the formation, different parameters such as formation permeability and porosity may occur in the three zones. Contamination zones exist at the regional intersection due to the mismatch between extraneous fluids and formation fluids meanwhile, especially in low-permeability reservoirs, where the effect of such contamination zones is more obvious. According to the situation of this kind of radial composite reservoir, a test well model for a three-zone dual-porosity radial composite reservoir was established by considering the effects of wellbore storage, interface skin effects, and interfacial resistance, by introducing an “interfacial skin” into the interfacial conditions. Through Laplace transform and numerical inversion method, the typical well test curve was drawn, and the effect of various factors on the typical well test curve was analyzed. Through the analysis of the characteristic curve, it is shown that the interface resistance has certain effect on the bottomhole pressure of the dual-porosity three-zone radial composite reservoir.