低渗非均质油藏数值模拟研究

Numer ical simulat ion of low permeability and
heterogeneous reservo ir

薛国庆 李 闽 王道成 梁 彬

Xue Guoqing  , LiM in, W ang Daocheng, et al

西南石油大学, 四川成都610500

Southw est Petro leum University,
Chengdu 610500, China

Poo r physical properties and high he terogene ities of low
perm eab ility reservo irs lead to the hete rogeneous d istribution
o f the thresho ld pressure g radien t. In the past, the th reshold
pressure g rad ient of each sim ulation g rid w as considered to be
a constant du ring study ing the effect of the thresho ld pressure
g radient on the percolation character in low perm eab ility
reservo irs. H ow ev er, th is m ethod can not consider that
reservo ir prope rties ’he terogeneity leads to the heterogeneous
d istr ibu tion o f the thresho ld pressure grad ient and can not
simu la te the perco lation characteristics accu rate ly. To
descr ibe the distr ibution o f the thresho ld pressure grad ient,
this paper establishes a two - dim ens iona l and tw o- phase
perco lation m athem atica l m odel w ith conside ring one the
thresho ld pressure grad ient, then studies and compares the
num erical sim ulation resu lts of the low perm eab ility reservo ir
w ith consider ing one that the thresho ld pressure grad ient is
constant, and w ith consider ing one that the thresho ld pressure
g radient is heterogeneous. The resu lts are dram atically
d ifferen t under tw o d iffe rent conditions. There fo re, during the
study ing o f perco lation charac teristics in flow - perm eab ility
reservo ir, the in fluence o f deve lopm ent index wh ich is
resu lted from heterogeneity of the thresho ld pressure gradient
must be considered.