西南石油大学学报(自然科学版)

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Experimental Researches on Relative Permeability Curve of Complex#br# Fracture System

PAN Yi1*, WANG Panrong2, SONG Daowan3, DONG Yajuan3, SUN Lei1   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    2. Zhanjiang Branch Co Ltd,CNOOC,Zhanjiang,Guangdong 524000,China
    3. Shengli Oilfield Company,SINOPEC,Dongying,Shandong 257015,China
  • Online:2016-08-01 Published:2016-08-01

Abstract:

Oil-water relative permeability curve of fracture system is very important in the waterflooding process of naturally
fractured reservoirs. We designed and made a series of large size physical model of fracture system based on the geological
charac- teristics of a certain fractured carbonate reservoir. Oil-water relative permeability curves were measured by using
unsteady-state method.The influence of fracture density and average fracture aperture on oil-water relative permeability curves
was studied. The results show that the shape of relative permeability curve is close to X curve type,and common percolation area
of two phases turns wide. When the irreducible water saturation increases,the common percolation area of two phases reduces
with the fracture density growing. With greater fracture density,the structure becomes more complex,the irreducible water
saturation in the phase permeability curve greater,and the range of the two-phase percolation area smaller,and the position of
the seepage point gradually moves to the right.

Key words: fractured carbonate reservoi, structure of the fracture system, fracture aperture, fracture density, relative permeability
curve

CLC Number: