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把钻头钻进岩石过程中随钻连续变化的井底，按时间离散化为一系列时间点上的井底，用来描述井底形状的变化。再把各时间点上的井底按空间离散化为一系列网格点，用各网格点的坐标来描述此时的井底形状。从而用时间的递推方法建立了随钻变化的井底模型。
The bottom of the well that changes continuously with drilling while drilling a bit is discretized by time into a series of wellbores at the time to characterize the shape of the bottom hole. Then at each time point on the bottom of the hole by space discretization into a series of grid points, with the coordinates of each grid point to describe the bottom shape at this time. Thus, a time-dependent recursion method is used to establish a bottomhole model that varies with drilling.