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http://dx.doi.org/10.12989/gae.2019.17.6.535

An experimental study on the hydraulic fracturing of radial horizontal wells  

Yan, Chuanliang (School of Petroleum Engineering, China University of Petroleum (East China))
Ren, Xu (School of Petroleum Engineering, China University of Petroleum (East China))
Cheng, Yuanfang (School of Petroleum Engineering, China University of Petroleum (East China))
Zhao, Kai (College of Petroleum Engineering, Xi'an Shiyou University)
Deng, Fucheng (School of Mechanical Engineering, Yangtze University)
Liang, Qimin (Research Institute of Petroleum Exploration and Development, CNPC)
Zhang, Jincheng (Sinopec Research Institute of Petroleum Engineering)
Li, Yang (School of Petroleum Engineering, China University of Petroleum (East China))
Li, Qingchao (School of Petroleum Engineering, China University of Petroleum (East China))
Publication Information
Geomechanics and Engineering / v.17, no.6, 2019 , pp. 535-541 More about this Journal
Abstract
Combining the radial well drilling and hydraulic fracturing technique, the production capacity of the reservoirs with low-permeability can be improved effectively. Due to the existence of radial holes, the stress around the well is redistributed, and the initiation and propagation of hydraulic fractures are different with those in traditional hydraulic fracturing. Therefore, it is necessary to study the influences of radial horizontal wells on hydraulic fracturing. The laboratory experiment was conducted to simulate the hydraulic fracturing on the physical model with radial holes. The experimental results showed that, compared with the borehole without radial holes, the sample with radial hole in the direction of maximum horizontal stress was fractured with significantly lower pressure. As the angle between direction of the horizontal hole and the maximum horizontal stress increased, the breakdown pressure grew. While when the radial hole was drilled towards the direction of the minimum horizontal stress, the breakdown pressure increased to that needed in the borehole without radial holes. When the angle between the radial hole and the maximum horizontal stress increase, the pressure required to propagate the fractures grew apparently, and the fracture become complex. Meanwhile, the deeper the radial hole drilled, the less the pressure was needed for fracturing.
Keywords
hydraulic fracturing; breakdown pressure; radial horizontal well; rock mechanics; experimental study;
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Times Cited By KSCI : 8  (Citation Analysis)
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