致密气藏平面非均质储层压裂水平井渗流及产剖特征分析

Study on flow and production profile characteristics of fractured horizontal wells in planar heterogeneous tight gas reservoirs

随着致密气藏的开发,压裂水平井被广泛应用,结果表明压裂水平井是提高单井产能和采收率的有效手段。在其应用过程中,致密气藏储层非均质性耦合压裂水平井复杂的水平段井身结构后,近井地带气井渗流特征更加复杂,储层非均质性对气井产剖影响程度等都需进一步开展研究,进而为气井产能预测和压裂工艺实施提供指导。文章采用数值模拟方法开展平面非均质储层压裂水平井渗流及产剖特征分析,利用数值模拟软件强大的后处理功能,直观揭示近井地带压裂水平井流动特征。研究结果表明:储层非均质性导致沿水平段高渗区与低渗区存在窜流,不同物性区域储量动用、泄气范围和压力降存在明显差异,高渗区裂缝产能贡献比例高。

With the development of tight reservoir,fractured horizontal well is widely used. The results show that fracturing horizontal well is an effective means to improve single well productivity and recovery. In the course of its application,tight gas reservoir heterogeneity is coupled with fracturing horizontal well complicated horizontal section wellbore structure. The flow characteristics of gas wells near the well area are more complicated. Further research is needed on the influence of reservoir heterogeneity on gas well production profile. This paper uses numerical simulation method to carry out the research. The results show that:reservoir heterogeneity leads to the existence of channeling in high permeability and low permeability areas along the horizontal section,there are obvious differences in reserve production,gas release range and pressure drop in different physical properties areas,and the contribution ratio of fracture productivity in high permeability area is high.