各向异性断块油藏油井压力特征分析

各向异性对断块油藏地层压力分布及油井井底压力有明显影响。针对无限大两夹角扇形断块油藏，建立了
考虑断层闭合的单相不稳定渗流模型，利用坐标变换及数值计算得到不同生产时间各向异性断块油藏地层压力及油
井井底压力，分析了不同生产时间、断层夹角和渗透率强度系数对地层压力及油井井底压力影响。通过分析得出：各
向异性油藏压降损失在方向上存在差异，地层压降更多发生在主渗透率方向上；断层夹角越小，断层边界对生产影响
越大，地层及油井井底压力值越低；油井井底压力随渗透率强度系数变化不呈现出单调变化关系，存在先减小后增大
趋势。

Analysis of Pressure Characteristics of Oil Well in Anisotropic Fault-block Oil Reservoirs

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.