有限导流裂缝水平井产能研究

Productivity of the Horizontal Well with Finite-conductivity Fractures

主要研究了压裂水平井产能特征。从理论基础出发,在分析已有模型优缺点的基础上,正确认识地层中裂缝产量的分布特征和规律;利用有限导流垂直井Dupuit公式原理,计算出有限导流水平井产能公式的当量井径。利用当量井径,确定油藏的水平井压裂n条裂缝的产能方程组。其中,重点以3条有限导流垂直裂缝产能推导计算为例,分析其生产动态特征,获取地层、水平井裂缝的几何参数和物性参数的变化关系,动态地分析裂缝条数、间距等因素对水平井裂缝流量分布造成的影响。

Based on the fluid theory and analysis of the advantages and disadvantages of existing models, this paper studies the characteristics of fractured horizontal wells and the distribution of fracture production in formation. According to the principle of Dupuit formula of finite-conductivity vertical wells, it calculates the effective wellbore radius of production formula for horizontal wells. With the effective wellbore radius, it sets up a productivity formula group for a horizontal well with N fractures. With three fractures as examples, it analyzes the production dynamic characteristics, and gets the relationship among some parameters, including formation parameters, horizontal well fractures geometry parameters and physical parameters. This paper also studies the the impact of fractures number, spacing and other factors on flow distribution for the horizontal well fracture. It shows that this method can guide the low-permeability fractured horizontal well optimization.