Pressure transient analysis for vertical fractured wells with fishbone fracture patterns

It is found that there are five flow regimes, they are bilinear flow, flow feed, fracture linear flow, formation linear flow, bi-radial flow and pseudoradial flow. The pressure depletion decreases with increase of the number, length and conductivity of secondary fractures, and their effect on contribution of primary fracture have a similar tendency. Effects of Inclined angle between secondary and primary fractures on pressure transit behavior occurs during flow feed and later regimes, while fractures pattern with different geometries can influence all the flow regimes. The derived analytical pressure transient solution may provide a theoretical basis for the analysis of the pressure transient behavior of the fishbone fracture pattern in a vertical well.