低渗透裂缝性油藏水力缝延伸特征分析 --以克拉玛依油田百31井区佳木河组油藏为例

在分析百31井区佳木河组油藏天然缝发育特征、现今应力特征、水力缝延伸特征的基础上,重点分析了天然缝和现今地应力对水力缝的影响,归纳了低渗透裂缝性油藏水力缝的分布规律。天然缝发育特征、现今应力场特征不但决定了水力缝分布特征,而且直接影响着压裂施工;百31井区佳木河组油藏油井压裂时水力缝基本上都是沿天然缝延伸或对天然缝进一步改造和沟通;油井射孔段天然缝产状、发育程度、水平应力大小直接影响着压裂施工压力。

Extension characteristic analysis of hydraulic fractures in low - permeability fracture - type reservoir--taking Jiamuhe formation reservoir in Bai 31 wellblock of Kelamayi Oilfield as example

The characters of natural fracture development, nowaday earth stress and hydraulic fracture extension in Jiamuhe formation reservoir of the Bai 31 wellblock were researched. The influence of the natural fracture and the nowaday earth stress field on the hydraulic fractures was analyzed emphatically. The rule of the hydraulic fracture distribution in low - permeability fracture - type reservoir was summarized. The character of the natural fracture development and nowaday earth stress affects not only hydraulic fracture distribution feature,but also fracturing operation. When oil well was fractured in Jiamuhe formation reservoir of Bai 31 wellblock , the hydraulic fracture extended along the natural fracture or was made by further reformation and connection. Strike - dip, development degree and horizontal stress of the natural fracture in oil well perforated intervals affects operated fracturing pressure directly.