TITLE:
A Novel Simulation Framework for Predicting the Formation Parameters Variation in Unconsolidated Sandstone Reservoir
AUTHORS:
Hongying Li, Wei Zhang, Bin Liu, Xinran Wang, Xilin Liu
KEYWORDS:
Formation Parameters Variation, Network Modeling, Numerical Simulation, High-Permeability Channels, Remaining Oil Distribution, Unconsolidated Sandstone Reservoir
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.7 No.7,
July
26,
2019
ABSTRACT:
After long-term waterflooding in unconsolidated
sandstone reservoir, the high-permeability channels are easy to evolve, which
leads to a significant reduction in water flooding efficiency and a poor
oilfield development effect. The current researches
on the formation parameters variation are mainly based on the experiment analysis or field statistics, while
lacking quantitative research of combining microcosmic and macroscopic
mechanism. A network model was built after taking the detachment and entrapment
mechanisms of particles in unconsolidated sandstone reservoir into
consideration. Then a coupled mathematical model for the formation parameters
variation was established based on the network modeling and the model of fluids
flowing in porous media. The model was solved by a finite-difference method and
the Gauss-Seidel iterative technique. A novel field-scale reservoir numerical
simulator was written in Fortran 90 and it
can be used to predict 1) the evolvement of high-permeability channels
caused by particles release and migration in the long-term water flooding
process, and 2) well production performances and remaining oil distribution. In
addition, a series of oil field examples with inverted nine-spot pattern was made on the new numerical simulator. The results show that the
high-permeability channels are more likely to develop along the main
streamlines between the injection and production wells, and the formation
parameters variation has an obvious influence on the remaining oil
distribution.