A novel approach of tight oil reservoirs stimulation based on fracture controlling optimization and design
LEI Qun,WENG Dingwei,GUAN Baoshan,MU Lijun,XU Yun,WANG Zhen,GUO Ying,LI Shuai
Table 1
Main reservoir and fracture parameters in the model.
Resource grade
Surface crude
oil density/
(g?cm
-3
)
Gas-oil ratio/
(m
3
?t
-1
)
In-place oil
viscosity/
(mPa?s)
Effective thickness
of pay zone/m
Initial reservoir pressure at specified depth/MPa
Depth of given initial reservoir pressure/m
Initial bubble point pressure/MPa
Extra-low permeability
0.763
74.3
2.24
20
10.0
1 688
6.85
Ultra-low permeability
0.854
115.7
1.07
20
16.7
2 123
12.08
Tight oil
0.827
103.9
1.04
20
16.0
1 840
7.18
Resource grade
Oil
saturation/
%
Effective reservoir permeability/
10
-3
μm
2
Porosity/
%
Injection-production
well pattern
Space between producer and injector
Half-fracture length of hydraulic fracturing/m
Dimensionless fracture conductivity
Extra-low permeability
55.9
0.230 0
12.9
Square inverted
nine-spot
300×300 m
135
1.5
Ultra-low permeability
50.0
0.080 0
12.0
Diamond inverted
nine-spot
480×130 m
186
2.2
Tight oil
46.0
0.007 5
9.0
Horizontal well
depletion pattern
Horizontal interval length 1 500 m
170
3.6