垂直裂缝井工作时在地层中诱发平面二维椭圆渗流，即形成以裂缝端点为焦点的共轭等压椭圆和双曲线流线族。
A vertical fractured well can bring out two dimensional flow in the direction of normals of developing ellipse conjugate equal pressure ellipse and hyperbola streamline bunches whose focal points are the two ends of the fracture when it works .
共轭双曲线