关键词: 各向异性, 断层, 坐标变换, 渗透率强度系数, 井底压力

Abstract:

Anisotropy has an obvious effect on the formation pressure distribution of fault-block oil reservoirs and oil well
bottom-hole pressure. To study infinite two-angle fan-shaped block reservoir，a single phase unstable seepage flow model was
established with the closed fault taken into consideration. According to the coordinate transformation and numerical calculating
method，the formation pressure distribution of anisotropic fault-block oil reservoirs and well bottom-hole pressure were derived
at different production time. Moreover，we analyzed the effect of different production time，fault angle and permeability strength
coefficient on formation pressure and bottom-hole pressure. The results show that the pressure drop loss in the anisotropic
reservoir varies with different directions，and the pressure drop loss is bigger in the direction of main permeability than others′.
The smaller the angle of the two intercept faults is，the bigger the effect of the fault boundary is，and the lower the well bottomhole
pressure is. The relationship curve between bottom-hole pressure and permeability strength coefficient is not monotonic
but has an inflection point. With the increase of the permeability strength coefficient，the bottom-hole pressure decreases first
and then increases.

Key words: anisotropy, fault, coordinate transformation, permeability strength coefficient, bottom-hole pressure