Modeling and simulation of complex fracture network propagation with SRV fracturing in unconventional shale reservoirs
Modeling and simulation of complex fracture network propagation with SRV fracturing in unconventional shale reservoirs
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DOI：
10.1016/j.jngse.2015.11.042
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发表时间：
2016
影响因子：
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通讯作者：
L. Ren;Yuliang Su;Shiyuan Zhan;Yongmao Hao;Fankun Meng;Guanglong Sheng
中科院分区：
文献类型：
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作者：
L. Ren;Yuliang Su;Shiyuan Zhan;Yongmao Hao;Fankun Meng;Guanglong Sheng
微地震裂缝测绘揭示，天然裂缝性非常规页岩油藏中的多条水力裂缝经常引起复杂的裂缝网络扩张。随着常规能源产能下降和非常规油气储量比重增加，需要改进复杂缝网扩展建模与模拟的理论方法，创新油藏体积压裂技术。为了模拟裂缝网络的扩展，提出了一种基于改进的位移不连续法（MDDM）耦合伪3D裂缝扩展模型的新模型，引入了扩展模式和准则。对该模型的数值结果进行了求解，模拟了不同天然裂缝（NF）分布和压裂参数下裂缝网络扩展的过程。讨论了NF分布、水力裂缝(HF)间距、井底压力以及分段和多簇压裂模式对缝网扩展的影响。复杂裂缝网络的模拟结果也用四个参数来表征。结果表明，非常规页岩油藏SRV压裂技术上存在合理的压裂参数。研究裂缝网络扩展规律对于合理、高效开发非常规页岩资源具有重要意义。
Multiple hydraulic fractures in naturally fractured unconventional shale reservoirs have often induced complicated fracture network expansion, as revealed by micro-seismic fracture mapping. As productivity of conventional energy resources decreases and the proportion of reserves in unconventional oil/gas increases, the theoretical method about the modeling and simulation of complex fracture network propagation needs to be improved to innovate stimulated reservoir volume (SRV) fracturing technology. To simulate the fracture network growth, a new model based on the modified displacement discontinuity method (MDDM) coupling pseudo-3D fracture propagation model is proposed introducing the propagation pattern and criterion. The numerical result of this model is solved and the process of fracture network propagation is simulated in different natural fracture (NF) distribution and fracturing parameters. The effects of NF distribution, hydraulic fracture (HF) spacing, bottomhole pressure and segmented and multi-cluster fracturing mode on the fracture network propagation are discussed. The simulation results of complex fracture network are characterized by four parameters as well. The results show that there are reasonable fracturing parameters technically during the SRV fracturing in unconventional shale reservoirs. It is significant to reasonably and efficiently develop the unconventional shale resources by researching the fracture network propagation rules.