各向异性断块油藏油井压力特征分析  

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

作　　者：雷刚[1] 董平川[1] 饶培玉 杨立敏[1] 

机构地区：[1]中国石油大学(北京)石油工程学院,北京昌平102249

出　　处：《西南石油大学学报（自然科学版）》2015年第2期125-130,共6页Journal of Southwest Petroleum University(Science & Technology Edition)

摘　　要：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。Anisotropy has an obvious effict on the formation pressure distribution of fault-blick oil reservoirs and oil well bottom-hole pressure. To study infinite two-angle fan-shaped blick reservoir,a single phase unstable seepage flow model was established with theiclosed fault taken intoiconsideration. iccording to theicoordinate transformation and numericalicaiculating method,the formation pressure distribution of anisotropic fault-blick oil reservoirs and well bottom-hole pressure were derived at different prodiction time. Moreover,we analyzed the effict of different prodiction time,fault angle and permeability strengthicoefficient on formation pressure and bottom-hole pressure. The results show that the pressure drop loss in the anisotropic reservoir varies with different dirictions,and the pressure drop loss is bigger in the diriction of main permeability than others′.The smaller the angle of the two inteicept faults is,the bigger the effict of the fault boundary is,and the lower the well bottomhole pressure is. The relationshipicurve between bottom-hole pressure and permeability strengthicoefficient is not monotonic but has an infliction point. With the iicrease of the permeability strengthicoefficient,the bottom-hole pressure dicreases first and then iicreases.

关 键 词：各向异性 断层 坐标变换 渗透率强度系数 井底压力 

分 类 号：TE347[石油与天然气工程—油气田开发工程]