Numerical Simulation Study on the Flow Influence of Multiscale Fractures During Water Flooding

会议论文
发表日期：

2024年

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Fan-le Meng,
You-jing Wang,
Guo-sheng Qin,
You Qi,
Zun-jing Ma,
De-rong Huang,
Xin-zhe Zou,
Yu-xin Liang

摘要

Multiscale fractures consist of artificial and natural fractures are important flow channels in low-permeability oil reservoir. Due to the different flow capacity of multiscale fractures, large-scale fractures will interfere with the flow of small-scale fractures. The regularities of fracture flow interference are crucial for the analysis of low-permeability water flooding law and residual oil. Therefore, this study first establishes a discrete fracture numerical simulation model to study the differences in water flooding in multiscale fractures. By quantitatively analyzing the differences in flow parameters on the fracture grid, a new parameter for evaluating fracture interference is established to clarify the law of fracture flow interference and the limit of fracture flow interference. The characteristics of water cut curves are also studied of different models. Simulation results show that there is flow interference in fractures with different scales. When the fracture aperture ratio difference is smaller than five, flow competition occurs between fractures. While the fracture aperture ratio difference greater than five, the flow contribution in narrow fractures is too small, and narrow fractures are considered to have no flow capacity. Besides, two types of water flooding modes are summarized based on the water cut curve, namely, the fracture competitive water flooding mode and the fracture shielding water flooding mode. The competitive water flooding mode corresponds to the fluid flow in all scale’s fractures at the same time and the water cut curves are stable rising type or step rising type. The shielding water flooding mode corresponds to the water channeling only in large fractures, and the water cut curve is a steep rising type. This study investigated the boundary and dynamic characteristics of multiscale fracture flow interference, and provides theoretical support for tapping the remaining oil and EOR of low-permeability oil reservoirs.