Recent Advance of Microbial Enhanced Oil Recovery (MEOR) in China

Table 4

Chao 50 block microbial flooding field test in Daqing Oilfield [61–63].

Area of block (km^2)	2.43
OOIP (tons)	1667000
Reservoir depth (m)	989
Reservoir thickness (m)	7.9-9.5
Reservoir temperature (°C)	55
Injectors/producers	2/10
Formation brine salinity (ppm)	4450
Formation brine divalent (ppm)	14
Average permeability (mD)	25
Average porosity (%)	17
Dead oil viscosity (cP)	20.2
Formation oil viscosity (cP)	9.7
Original oil saturation (%)	57
Water cut	95%
Implementation time	June 2004-Sep 2005
Injection slug (PV)	0.005
Microbe concentration	5% (first slug), 2% (second slug)
Effective well ratio	74.2%
EOR (% OOIP)	3%
Water cut reduction (%)	30.3
Input-output ratio	1 : 6
Effective duration time	3 years
Expansion test	Yes