登顶现象在水平井或大斜度井中出现，并受所包含流体的特性和水平渗透率与垂直渗透率的比率的影响。
Cresting occurs in horizontal or highly deviated Wells and is affected by the characteristics of the fluids involved and the ratio of horizontal to vertical permeability.
通过对井眼的地层压力测量，可以获得水平和垂直方向上的渗透率、表皮系数以及地层压力等地层信息。
Through measurement of formation pressure, the permeability, skin factor and formation pressure etc. informations can be obtained in horizontal and vertical direction.
根据煤层割理渗透率的各向异性，采用垂直面割理和平行面割理两个方向布置钻孔抽放煤层气。
This experiment bases on different permeability in different directions of coal seam cleats. To arrange methane drainage direction the directions vertical and parallel to face cleat are adopted.
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