The development of volume fracturing technique is still in its infancy. A large number of domestic oilfields have attempted ways of hydraulic fracturing, among which Changqing oilfield has made great progress by developing a new technique named segmented multi-cluster fracturing. As the seepage flow mechanism of volume fractured reservoir is still far from perfection, this article tries to propose a basic model for volume fractured vertical wells, which is based on the concept of SRV. Firstly, the seepage flow underground is divided into two processes:seepage flow in reservoir and seepage flow in fracture. Then the seepage in reservoir is studied with Green function and line source function, while the seepage in fracture is assumed as the Darcy flow. Finally, the two processes are coupled at the fracture surface with equivalent pressure and flow rates. The pressure and pressure derivative type curves are obtained by solving flow matrix equations, and the factors related to the type curve are studied. In the end this model is proven to be an efficient model coupling vertical fractured wells, two porosity system and radial composite reservoir, which is a foundation for pressure transient analysis of volume fractured wells.

volume fracturing  /  fluid flow  /  source function  /  superposition principle  /  dual-porosity  /  radial composite