ASYMMETRY OF FLUID EXCHANGEIN A DEFORMABLE FRACTURED-POROUS 
MEDIUM

A. A. Shchipanov

UDC 532.546

The mechanism of fluid exchange between fractures and a pore matrix
that occurs in the case of flow in a fractured-porous medium has
been investigated with the use of an analytical apparatus and
numerical modeling. It has been established that the decrease
in the permeability of fractures in their deformation causes a
symmetry loss by the matrix-fracture exchange. In single-phase
flow, the asymmetry of the exchange is in the presence of a crossflow
from the fractures to the matrix with increase and decrease
in the fluid pressure in the medium. In two-phase oil-water flow,
the symmetry of exchange (oil to fractures and water to the matrix)
can be broken with decrease in the fracture permeability:
the matrix-fractures oil flow is replaced by a fractures-matrix
water flow. The asymmetry of the exchange can be the reason for
the substantial reduction in the efficiency of cyclic action on
the fractured-porous oil bed.

PermNIPIneft', 29 Sovetskaya Armiya Str., Perm', 614066, Russia;
email: aschipanov@permnipineft.com. Translated from Inzhenerno-Fizicheskii
Zhurnal, Vol. 80, No. 1, pp. 35-45, January-February, 2007. Original
article submitted November 26, 2004; revision submitted July 18, 2006.