Crack morphology of multiple radial well fracturing based on extended finite element method

被引：2
|
作者：
Qu Z. [1 ]
Li X. [1 ]
Li J. [2 ]
Guo T. [1 ]
Tian K. [1 ]
Zhang W. [1 ]
Tian Y. [1 ]
机构：
[1] School of Petroleum Engineering in China University of Petroleum, Qingdao
[2] College of Architecture & Environment in Sichuan University, Chengdu
来源：
Li, Xiaolong (lixiaolong199041@foxmail.com) | 2018年 / University of Petroleum, China卷 / 42期
关键词：
Extended finite element method; Induced stress field; Interference stress field; Orientated propagation; Radial well fracturing;
D O I：
10.3969/j.issn.1673-5005.2018.01.009
中图分类号：
学科分类号：
摘要：
The technology of radial well fracturing has been applied in various oil fields and proved to be effective, and the crack morphology needs an intensive investigation. In this study, a formation fracturing model was built using the extended finite element method (XFEM) based on fluid-solid coupling equations, and the maximum principal stress criterion and maximum energy release rate criterion were both used as the damage mechanisms of rock materials. The simulation results of three types of well models(i.e. the single radial well, vertical multiple radial wells and horizontal multiple radial wells) were analyzed, and verified by 3D physical experiments in the laboratory. It has concluded that an induced stress field along the radial well during fracturing is the main reason for the propagation major fractures. The distance of orientated fracture can extend to 40 meters. The effect of crack orientated propagation can be improved under vertical multi radial wells fracturing. An interference stress field can be induced at near wellbore under horizontal multi radial well fracturing, and secondary cracks connected with nearby radial wells can be generated in the interference stress field. Also the major fracture propagating along the radial well can be still generated in the zone far away from the wellbore. The combination of the two kinds of fractures can effectively improve the oil drainage area and also can reduce the oil flow resistance near the wellbore. At last the perforation scheme of radial wells is optimized. © 2018, Periodical Office of China University of Petroleum. All right reserved.
引用
收藏
页码：73 / 81
页数：8
相关论文
共 21 条
  • [1] Wang Z., Guo D., Deng J., Et al., Effect of perforation mode on the fracturing pressure and cranny geometric shape, Journal of Southwest Petroleum Institute, 27, 5, pp. 57-60, (2005)
  • [2] Zhang G., Chen M., Complex fracture shapes in hydraulic fracturing with orientated perforations, Petroleum Exploration and Development, 36, 1, pp. 103-107, (2009)
  • [3] Lei X., Zhang S., Xu G., Et al., Impact of perforation on hydraulic fracture initiation and propagation in tight gas reservoir, Journal of Northeast Petroleum University, 39, 2, pp. 94-100, (2015)
  • [4] Cai B., Ding Y., Lu Y., Et al., Study and application of new in-fissure fracturing technique for improving stimulated reservoir volume, Petroleum Geology and Recovery Efficiency, 19, 5, pp. 108-110, (2012)
  • [5] Zhang T., Wang Y., Hu G., Et al., Effect of perforation parameters on hydraulic fracturing, Drilling & Production Technology, 33, 2, pp. 44-47, (2010)
  • [6] Ma K., Wu F., Yang Y., Et al., Application of radial horizontal drilling technology in W5 well, Drilling & Production Technology, 28, 5, pp. 17-20, (2005)
  • [7] Cui C., Wang X., Yang Y., Et al., Optimization of radial drilling branch number and length in low permeability reservoirs during high water cut period, Petroleum Geology and Recovery Efficiency, 21, 5, pp. 61-64, (2014)
  • [8] Tang L., Li X., Xue J., Research and application of radial drilling technology in low permeability sandstone and conglomerate reservoir, Natural Gas Geoscience, 25, 1, pp. 113-117, (2014)
  • [9] Liu Y., The research of increasing production mechanistic of radial direction drilling in low permeability reservoir, (2012)
  • [10] Gong D., Study on the law of fracture initiation and propagation and productivity prediction for radial well-fracturing, (2016)
123