Abstract: Aimed at the sealed reservoir model with composite dual permeability, the Laplace space solution of dimensionless pressure distribution of variable flow rate under the condition of two types of interior boundary is studied, and on the basis of deeply probing the structure and the relationship of the solution, the relationship between the solution and composite dual permeability and homogeneous reservoir pressure distribution is figured out. The well test analysis theory is further improved, and the method is very valuable to the development of the corresponding well test software, meanwhile, it is also meaningful to numerical simulation of reservoir engineering.

Key words: composite dual permeability reservoir, outer sealed boundary, pressure distribution, variable flow rate, Laplace space solution