低渗透非均质油藏油井压裂裂缝参数优化研究

低渗透油藏的特点是储集层物性差、非均质性强、层间差异大、油井无自然产能或自然产能很低。因此如何利用水力裂缝高效沟通储层、建立稳定的油气渗透通道是压裂作业亟待解决的问题。以菱形反九点为例,建立低渗透非均质地质模型。详细分析了在不同裂缝参数下采出程度、含水率和无水采油期的变化关系,并采用正交设计实验判断裂缝参数的主次关系。结果表明,裂缝导流能力和裂缝穿透比不是越大越好,均存在一个最佳值。在低渗非均质油藏条件下,裂缝导流能力是影响采出程度的主要参数,其次是裂缝穿透比。

Optimization of Fracturing Parameters for Low Permeability and heterogeneous Reservoir Oil Well

Low permeability reservoir is characterized by poor reservoir properties, strong heterogeneity, great differences between layers, no natural production or very low. Therefore, how to use effective hydraulic fractures connect the reservoir and establish a stable oil and gas permeability channel is a key issue. This article take the diamond shaped inverted nine spot patterns , establishment a low permeability and heterogeneous geological model ,using numerical simulation methods analyzes the relationship between the reserves recovery degree and water cut and water free production period under different fracturing parameters, using Orthogonal design to determine fracturing parameters of primary and secondary relationship. The result shows that fracture conductivity and penetration ratio is not the bigger the better, there is an optimum value, in the low permeability reservoir conditions, the main parameter that affects recovery is fracture conductivity followed by penetration ratio.