平面各向异性油藏变形五点井网研究

Research on skewed five-spot pattern for planar anisotropic reservoir

采用规则井网对平面各向异性油藏布井时,易造成注入水沿高渗透率条带突进,使生产井过早见水,难以实现面积井网均匀驱替效果。为解决该问题,利用流管法构建平面各向同性油藏五点井网产能公式,通过物质平衡方程展开得到井网的见水时间,在满足均匀驱替的基础上,得到无量纲注采井距与各向异性系数的关系,为平面各向异性条件下合理构建五点井网形状提供了理论依据。

When regular well pattern is arranged for planar anisotropic reservoirs,it is likely that injected water advances along high permeability path,resulting in early water breakthrough and hard to achieve uniform oil displacement with areal pattern.Therefore,this research developed a productivity formula of five-spot pattern for planar isotropic reservoir by using stream tube method;the material balance equation is expanded to obtain water breakthrough time of five-spot pattern,and the relationship between dimensionless well spacing and anisotropy coefficient is derived on the basis of uniform displacement.The result of this research offers theoretical basis for reasonably arranging five-spot pattern under planar anisotropic condition.