In order to understand the water-flooding characteristics of different
fracture systems in metamorphic rock buried hill reservoirs and the mechanism
of improving water-flooding development effect, a three-dimensional physical
model of fractured reservoirs is established according to the similarity
criterion based on the prototype of metamorphic buried hill reservoirs in JZ
Oilfield in Bohai Bay Basin. Combined with the fractured reservoir
characteristics of JZ Oilfield, the water displacement characteristics of the
top-bottom staggered injection-production well pattern in different fracture
network mode and different fracture development degree of buried hill reservoir
are studied. The experimental results show that: 1) the more serious the fracture
system irregularity is, the shorter the water-free oil production period is and
the lower the water-free oil recovery is. After water breakthrough of
production wells, the water cut rises faster, and the effect of water flooding
development is worse; 2) under the condition of non-uniform fracture
development, the development effect of the bottom fracture undeveloped is
better than that of the middle fracture undeveloped. Water injection wells are
deployed in areas with relatively few fractures, while oil wells are deployed
in fractured areas with higher oil recovery and better development effect.
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