摘要：Numerous micro-seismic and laboratorial studies show that hydraulic fracture is usually with complex geometries, such as plugged fracture, asymmetry and non-plane. It is a challenging task to recognize the complex fracture and obtain reliable fracture parameters through transient pressure analysis. In this work, we extend the semi-analytical model by Zhou a al. (2013) to analyze transient pressure behavior of a fractured vertical well with complex fracture geometries. We verified the semi-analytical model by a numerical reservoir simulator on a planar fracture. Then, based on this model, we made a systematical discussion about the transient pressure behavior of the planar fracture with varying conductivity, asymmetric fracture and non-planar fracture. Results show that when the fracture conductivity is varying along the fracture path, the influence of fracture zone conductivity on the transient pressure behavior gradually decreases with the distance from the wellbore growing. Besides, we found that the fracture asymmetry is against for the fluid flow in the fracture, and it decreases the slope of transient pressure behavior curve and enlarge pressure drop. In addition, the non-planar fracture is usually with severe fracture width restriction around the wellbore, which will induce pseudo-radial flow in the fracture at early times and large pressure drop in the fracture. Furthermore, the influences of varying conductivity, fracture asymmetry and non-plane on transient pressure behavior are obvious for fracture with average small-to-middle conductivity (average dimensionless fracture conductivity ranging from 0.1 to 50); the influences become negotiable for fracture with average high-to-infinite conductivity (average dimensionless fracture conductivity ranging from 50 to 1000). This work can provide critical insights into understanding the effect of complex fracture geometry on transient pressure behavior of fractured vertical well in tight oil reservoir.

关键字：Semi-analytical model Transient pressure behavior Vertical fractured well Complex fracture geometries

ISSN号：0920-4105

卷、期、页：卷: 174 页: 14-24

发表日期：2019-03-01

影响因子：1.873000

期刊分区（SCI为中科院分区）：三区

收录情况：SCI（科学引文索引印刷版）,ESI（基本科学指标数据库）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Journal of Petroleum Science and Engineering

参与作者：于伟,Sepehrnoori, Kamy

通讯作者：刘庆岭

第一作者：田守嶒,李根生,盛茂,沈忠厚

论文类型：期刊论文

论文概要：刘庆岭,田守嶒,于伟,李根生,盛茂,Sepehrnoori, Kamy,沈忠厚，A semi-analytical model for simulation of fluid flow in tight rock with irregular fracture geometry，Journal of Petroleum Science and Engineering，2019，卷: 174 页: 14-24

论文题目：A semi-analytical model for simulation of fluid flow in tight rock with irregular fracture geometry