低渗透油藏垂直裂缝井产能预测及分析

发布时间：2018-08-04 16:20

【摘要】：压裂改造技术在低渗透油藏开发中应用广泛,不同的压裂方案所产生的增产效果也不同。为了达到所预期的增产效果,研究压裂后的产能对优化压裂设计有着重要的意义。为此,根据垂直裂缝井周围地层的渗透特征,建立径向流与双线性流复合的低渗透油藏垂直裂缝井渗流模型,考虑低渗透油藏存在启动压力梯度的影响,推导出了低渗透油藏无限导流裂缝和有限导流裂缝的产能公式,有限导流裂缝产能公式计算的结果与现场数据对比误差小于7%。依据准噶尔盆地某区块的特低渗透巨厚砾岩油藏的基础参数数据,绘制了不同影响因素下的产能曲线,并对曲线进行分析得出:裂缝的导流能力达到一定值后,才能近似为无限导流,否则会产生较大的误差;压裂的各项参数必须与储层条件相匹配,才能在现有的经济条件下达到所预期的增产效果。
[Abstract]:Fracturing technology is widely used in the development of low permeability reservoirs, and different fracturing schemes produce different stimulation effects. In order to achieve the expected effect of increasing production, it is of great significance to study the productivity after fracturing to optimize the fracturing design. Therefore, according to the permeability characteristics of the formation around the vertical fractured wells, the percolation model of vertical fractured wells in low permeability reservoirs with radial flow and bilinear flow is established, and the influence of starting pressure gradient on low permeability reservoirs is considered. The productivity formulas of infinite and finite diversion fractures in low permeability reservoirs are derived. The calculation results of the productivity formulas of finite diversion fractures are less than 7. Based on the basic parameter data of ultra-low permeability and giant thick conglomerate reservoir in Junggar Basin, the productivity curves under different influence factors are drawn, and the curves are analyzed. The results show that the conductivity of fractures reaches a certain value. The parameters of fracturing must match the reservoir conditions in order to achieve the expected increase in production under the existing economic conditions.
【作者单位】：中国石油勘探开发研究院;
【基金】：国家科技重大专项大型油气田及煤层气开发“低渗-超低渗油藏有效开发关键技术”课题六“低渗、特低渗复杂油藏规模有效动用关键技术”(编号:2017ZX05013-006)
【分类号】：TE328

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