非常规油气藏压裂水平井动态缝网模拟方法及应用

doi:10.11743/ogg20220317

Abstract

Abstract:

When a fractured horizontal well in unconventional reservoirs is brought online， change in reservoir pressure may lead to fracture deformation， resulting in the formation of dynamic fracture network that greatly affects well productivity. To simulate the effect of dynamic fracture network on the development of unconventional reservoirs and improve the designation level of development strategy， the study builds a mathematical model to characterize the time variant and the heterogeneous distribution of fracture width， which can simultaneously simulate the changes of fracture width and fracture length in a reservoir. Then， the conductivity modification technique is adopted to couple the fracture deformation model with discrete fracture simulation model. A reservoir numerical simulator that can model dynamic fracture network is then developed. Finally， the simulator is applied to the simulation of a typical reservoir model and an actual fractured horizontal well model， respectively. Dynamic fracture network models for different production periods are thereby obtained， and the effect of dynamic fracture network on the well productivity is clarified. In all， the simulation results indicate that the simulated performance is in better agreement with practical well performance when the fracture deformation is considered in the simulator.

Key words: fracture deformation, numerical simulation, fractured horizontal well, dynamic fracture network, unconventional reservoir

CLC Number:

TE357

Chuanxi Liu, Wenchao Fang, Xuejie Qin. Simulation of dynamic fracture network in fractured horizontal well for unconventional reservoirs： Theory and application[J]. Oil & Gas Geology, 2022, 43(3): 696-702.

Figures/Tables 13

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参数	取值	参数	取值
油藏压力/MPa	20	原油压缩系数/MPa^-1	1×10^-3
基质渗透率/（10^-3μm²）	0.01	地层原油粘度/（mPa·s）	5
基质孔隙度/%	8	地层原油密度/（ kg·m^-3）	850
裂缝渗透率/（10^-3μm²）	5	原油体积系数	1.13
岩石压缩系数/MPa^-1	1×10^-5	生产时定井底流压/MPa	10

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Simulation of dynamic fracture network in fractured horizontal well for unconventional reservoirs： Theory and application

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