• 油气藏评价 •

### 封闭断层复合油藏压裂井压力动态特征

1. 陇东学院能源工程学院,甘肃庆阳 745100
• 收稿日期:2018-12-21 出版日期:2019-12-26 发布日期:2019-12-30
• 作者简介:姬安召（1983 —）,男,硕士,讲师,从事油气井动态分析研究。通讯地址：甘肃省庆阳市西峰区兰州路45号陇东学院能源工程学院,邮政编码：754000。E-mail： jianzhao_831024@163.com
• 基金资助:
甘肃省高等学校科研项目“陇东超低渗透油藏降压增注及提高采收率方法研究”(2018A-097)

### Pressure transient characteristics of fractured wells in closed fault composite reservoirs

Anzhao JI,Yufeng WANG

1. School of Energy Engineering, Longdong University, Qingyang, Gansu 745100, China
• Received:2018-12-21 Online:2019-12-26 Published:2019-12-30

Abstract:

The existing faults affects the propagation of pressure waves in the composite reservoirs, meanwhile, the location of faults affects the curves of the bottom hole pressure. Based on the principle of seepage mechanics and point source function, the fractured-well line source solution of fault composite reservoirs in Laplace domain was obtained by image principle, pressure drop superposition principle and Laplace integral transformation. The bottom hole pressure solution of finite-conductivity fractured wells was obtained by coupling fracture of fractured-well and reservoir model. The typical characteristic curves of dimensionless bottom hole pressure and pressure derivative were drawn by Stehfest numerical inversion in the real space. The results showed that the characteristic curve was divided into seven flow stages generally. In the early stage, the position of dimensionless bottom hole pressure and pressure derivative curves decreased with the increase of the fracture conductivity. When the mirror well was located in the inner region, the pressure derivative curves of radial flow and subsequent bottom hole pressure showed horizontal lines of 0.5, 1 and fluidity ratio M12 in inner part and outer part, and the larger the inner radius was, the longer the radial flow in the inner zone would be. When the mirror well was located in the outer region, the pressure-derivative curve of radial flow and subsequent bottom hole pressure showed horizontal lines with the value of 0.5, 0.5M12 and fluidity ratio of M12 in inner and outer zones.

• TE312