Abstract: The flow mechanism of Horizontal well with multiple transversal fractures is studied. Under the assumption of variable flow rate between transversal fractures, theoretical curves of bottom hole pressure are given, which show flow characteristics of three periods: the first one represents the linear flow in fractures; the second one the instantaneous flow from strata to fractures and from fractures to the wellbore; and the third one the stable flow of the system equilibrium. They also indicate the effects of fracture length and fracture spacing on the wellbore pressure. In addition, study shows that at early stage, the bottom hole pressure behavior of horizontal well with multiple transversal fractures is similar with that of vertical well with vertical fractures.

Key words: fracture, horizontal well, percolation, low permeability reservoir