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Natural Gas Geoscience ›› 2011, Vol. 22 ›› Issue (2): 340-346.doi: 10.11764/j.issn.1672-1926.2011.02.340

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ANSYS Simulation of Fracture Width Variation in Fracture cavity Reservoirs

LI Song, KANG Yi-Li, LI Da-Ai, YOU Li-Jun, LIAN Zhang-Hua   

  1. State Key Laboratory of Oil and Gas Reservoir Geology and  Exploitation, Southwest Petroleum University, Chengdu  610500,China
  • Received:2010-10-14 Revised:2010-12-19 Online:2011-04-10 Published:2011-04-10

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Abstract:

Computer simulations of a single or set of fractures were conducted previously, and the effects of cavities on fracture width variation were hardly concerned. In this paper, we established a finite element model of fracture width variation for different fracture\|cavity groups according to the finite element method of fracture mechanics and computer simulation, and discussed 3 types of fracture-cavity groups models related with fractured/caved carbonate reservoirs in Tahe oilfield.The relationships among the fracture width, length, positive differential pressure and cavity development were probed. The simulation results showed that, the fracture width increment increased with the increasing of the positive differential pressure; under the same positive differential pressure, the fracture width increment increased with the growing of fracture length; and the occurrence of cavities intensified the fracture width variation.  The richer the cavities porosity was, the bigger the fracture width increment was; the growing of fracture width increment was coming with the increasing of cavity radius. The computer simulation of fracture width variation can provide a theoretical basis for choosing suitable lost circulation materials and improving lost control technologies.

Key words: Computer simulation, Fracture-cavity reservoir, Cavity, Fracture dynamic width, Fracture width increment.

CLC Number: 

  • TE258

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