Petroleum Science >2015,??Issue 4:??674-682 DOI: https://doi.org/10.1007/s12182-015-0055-4
Numerical simulation of hydraulic fracture propagation in tightoil reservoirs by volumetric fracturing Open?Access
文章信息
作者：Shi-Cheng Zhang,Xin Lei,Yu-Shi Zhou and Guo-Qing Xu
作者單位：
College of Petroleum Engineering, University of Petroleum, Beijing 102249, China;College of Petroleum Engineering, University of Petroleum, Beijing 102249, China;College of Petroleum Engineering, University of Petroleum, Beijing 102249, China;College of Petroleum Engineering, University of Petroleum, Beijing 102249, China
投稿時間：2015-05-11
引用方式：Zhang, SC., Lei, X., Zhou, YS. et al. Pet. Sci. (2015) 12: 674. https://doi.org/10.1007/s12182-015-0055-4
文章摘要
Volumetric fracturing is a primary stimulation
technology for economical and effective exploitation of
tight oil reservoirs. The main mechanism is to connect
natural fractures to generate a fracture network system
which can enhance the stimulated reservoir volume. By
using the combined finite and discrete element method, a
model was built to describe hydraulic fracture propagation
in tight oil reservoirs. Considering the effect of horizontal
stress difference, number and spacing of perforation clusters,
injection rate, and the density of natural fractures on
fracture propagation, we used this model to simulate the
fracture propagation in a tight formation of a certain oilfield.
Simulation results show that when the horizontal
stress difference is lower than 5 MPa, it is beneficial to
form a complex fracture network system. If the horizontal
stress difference is higher than 6 MPa, it is easy to form a
planar fracture system; with high horizontal stress difference,
increasing the number of perforation clusters is
beneficial to open and connect more natural fractures, and
to improve the complexity of fracture network and the
stimulated reservoir volume (SRV). As the injection rate
increases, the effect of volumetric fracturing may be
improved; the density of natural fractures may only have a
great influence on the effect of volume stimulation in a low
horizontal stress difference.
technology for economical and effective exploitation of
tight oil reservoirs. The main mechanism is to connect
natural fractures to generate a fracture network system
which can enhance the stimulated reservoir volume. By
using the combined finite and discrete element method, a
model was built to describe hydraulic fracture propagation
in tight oil reservoirs. Considering the effect of horizontal
stress difference, number and spacing of perforation clusters,
injection rate, and the density of natural fractures on
fracture propagation, we used this model to simulate the
fracture propagation in a tight formation of a certain oilfield.
Simulation results show that when the horizontal
stress difference is lower than 5 MPa, it is beneficial to
form a complex fracture network system. If the horizontal
stress difference is higher than 6 MPa, it is easy to form a
planar fracture system; with high horizontal stress difference,
increasing the number of perforation clusters is
beneficial to open and connect more natural fractures, and
to improve the complexity of fracture network and the
stimulated reservoir volume (SRV). As the injection rate
increases, the effect of volumetric fracturing may be
improved; the density of natural fractures may only have a
great influence on the effect of volume stimulation in a low
horizontal stress difference.
關(guān)鍵詞
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Tight oil reservoir Volumetric fracturing Fracture propagation Horizontal stress difference Stimulated reservoir volume