A Mathematical Model for Natural Fracture Evolution in Water-Flooding Oil Reservoir

Abstract:

The fractured low permeability reservoirs develop complex fracture network. As the of waterflooding recovery heightens, excessive high injection pressures and excessive water injection rate will result in open, initiation, propagation and coalescence of micro-fracture, connecting injection with production form the high permeability zone, which results in a one-way onrush of waterflooding, water cut in oil well water rise quickly, causing a severe oil well flooding and channeling, thereby reducing the ultimate oil recovery efficiency. The effect of the waterflooding seepage within natural fracture on fracture initiation is studied and analyzed here, applying the theory of rock fracture mechanics to analyze the interaction of fracture system for naturally fractured reservoirs in waterflooding developing process, studying the mechanical mechanism of opening, initiation, propagation and coalescence of natural fracture under injection pressure, which is important theoretical significance for studying the distribution law of fracture and defining appreciate water injection mode and injection pressure in the process of injection development of the naturally fractured reservoir and for delaying the directivity water break-through and water flooding rate of oil well in the process of injection development.

• Periodical: Advanced Materials Research (Volume 868)
• Pages: 535-541
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.868.535
• Online since: December 2013
• Authors: Hong Liu*, Lin Wang, Yu Wu Zhou, Xi Nan Yu
• Keywords: Fracture Coalescence, Fracture Propagation, Naturally Fractured Reservoir, Water Flooding

References

[1] Wu Zhiyu, Li Qiang, Chen Yong, etc. Application of crack monitoring technology in Ansai oilfield development [J]  (in Chinese). Logging Technology, 2004, 28 (1).

[2] Li Pingle, Zhang Li, Yang Yajuan, etc. Effect of hydraulic conductivity of the fracture on injection and production in Hanan oilfield and development countermeasures [J] (in Chinese). Oil and GasGeology, 2001, 22 (1).

[3] Zhang Yingan, Zhang Yingfu, Ai Changfeng etc. Pressure water injection method Super fracture extension of low permeability reservoir [J] (in Chinese). Daqing Petroleum geology and Development, 2004, 23 (2).

[4] He Ke, Peng Fujun, Peng Guanyu, etc. awareness of the fracture and countermeasures in oilfield water-bearing development phase [J] (in Chinese). Western Exploration Engineering, 2004, (9).

[5] Liu Jianju, Liu Xiangui. Dynamic model of crack propagation in the Oil and gas reservoirs [J] (in Chinese) . Engineering Mechanics, 2001 (Supplement) 118-122.

[6] Zhu Zhende, Hu Ding. Effect of Fissure water pressure on rock strength [J] (in Chinese). Rock and Soil Mechanics, 2000, 121 (1) 64-67.

[7] Yang Tianhong, Tang Chunan, Zhu Wancheng, etc. Analysis of the coupled seepage and stress in the rock failure process  [J] (in Chinese). Journal of Geotechnical Engineering, 2001, (04).

[8] J. Bell(writer) , Li Jingsheng, Chen Chongxi (translator), Sun Nazheng(revision). porous media fluid dynamics [M] (in Chinese). Beijing: China Building Industry Press, (1983).

[9] Xie Xinghua. Experimental Study on Hydraulic Fracture Mechanism of Rock Mass and Numerical Simulation [D] (in Chinese). ​​Hehai University, (2004).

[10] Yaoming Mi. Three-dimensional analysis of crack growth [J] (in Chinese). Computational Mechanics Publications, (1996).