基于FEMM的径向井压裂裂缝扩展模拟研究

doi:10.13809/j.cnki.cn32-1825/te.2020.01.016

Abstract

Abstract:

Radial wells can be used to guide the propagation of hydraulic fractures in order to connect the natural fractures or caves in unconventional reservoirs and improve the recovery of oil and gas resources. Fracturing technology of radial wells has been preliminarily applied and developed in low permeability and shallow reservoirs, but its mechanism is still not very clear. Therefore, the basic principle of FEMM（Finite Element-Meshfree Method） is introduced. Besides, based on the FEMM and the field data, the radial well fracturing model with different well angles is established, and the effect of different azimuth angles on fracture propagation of radial well fracturing is studied. The results show that by using FEMM, it can be verified that radial wells play a guiding role in hydraulic fracturing. In addition, the hydraulic fracture firstly propagates along the direction of radial wells. After extending a certain distance, it turns to the direction of maximum horizontal stress. The bigger the angle between the radial wells and the horizontal maximum principal stress, and the shorter the length of fracture extending along the radial wells, the weaker the guiding ability of radial wells will be. The research results contribute to the application of radial well fracturing technology.

Key words: radial well, hydraulic fracturing, FEMM, orientated propagation, fracture path

CLC Number:

TE357

ZHANG Yaofeng,SHAO Zuliang,WANG Tao,BO Yin. Research on fracture propagation of radial well fracturing based on finite element-meshfree method[J].Reservoir Evaluation and Development, 2020, 10(1): 102-107.

Figures/Tables 8

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References 20

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储层尺寸/ m	井筒直径/m	径向井长度/m	径向井直径/m	岩石泊松比	岩石孔隙度/%
40×40×2	0.139 7	20	0.05	0.25	16
岩石渗透率/10^-3 μm²	岩石杨氏模量/GPa	垂向地应力/MPa	最大水平主应力/MPa	最小水平主应力/MPa	泵注压力/MPa
30	13	45	41	36	41

Research on fracture propagation of radial well fracturing based on finite element-meshfree method

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