Geomechanics and Engineering

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Hydraulic fracturing experiments of highly deviated well with oriented perforation technique

  • Zhu, Hai Y. (State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University) ;
  • Deng, Jin G. (State Key Laboratory of Petroleum Resource and Prospecting (China University of Petroleum, Beijing)) ;
  • Liu, Shu J. (CNOOC Research Institute) ;
  • Wen, Min (CNOOC Research Institute) ;
  • Peng, Cheng Y. (CNOOC Research Institute) ;
  • Li, Ji R. (State Key Laboratory of Petroleum Resource and Prospecting (China University of Petroleum, Beijing)) ;
  • Chen, Zi J. (State Key Laboratory of Petroleum Resource and Prospecting (China University of Petroleum, Beijing)) ;
  • Hu, Lian B. (State Key Laboratory of Petroleum Resource and Prospecting (China University of Petroleum, Beijing)) ;
  • Lin, Hai (State Key Laboratory of Petroleum Resource and Prospecting (China University of Petroleum, Beijing)) ;
  • Guang, Dong (Research Institute of Engineering and Technique, Huabei Sub-Company, SINOPEC)
  • Received : 2013.07.08
  • Accepted : 2013.09.22
  • Published : 2014.02.25
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Abstract

In order to investigate the effect of different perforation angles (the angle between the perforation direction and the maximum horizontal principal stress) on the fracture initiation and propagation during hydraulic fracturing of highly deviated well in oil & gas saturated formation, laboratory experiments of the hydraulic fracturing had been carried out on the basis of non-dimensional similar criteria by using 400^3 $mm^3$ cement cubes. A plane fracture can be produced when the perforations are placed in the direction of the maximum horizontal principal stress. When the perforation angle is $45^{\circ}$, the fractures firstly initiate from the perforations at the upper side of the wellbore, and then turn to the maximum horizontal principal stress direction. When the well deviation angle and perforation angle are both between $45^{\circ}$ and $90^{\circ}$, the fractures hardly initiate from the perforations at the lower side of the wellbore. Well azimuth (the angle between the wellbore axis and the maximum horizontal principal stress) has a little influence on the fracture geometries; however it mainly increases the fracture roughness, fracture continuity and the number of secondary fractures, and also increases the fracture initiation and propagation pressure. Oriented perforating technology should be applied in highly deviated well to obtain a single plane fracture. If the well deviation angle is smaller, the fractures may link up.

Keywords

Acknowledgement

Supported by : National Science and Technology

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