Journal
ENERGY & FUELS
Volume 29, Issue 12, Pages 7781-7792Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.5b01236
Keywords
-
Categories
Ask authors/readers for more resources
Improved oil recovery from oil-wet low-permeability limestone reservoirs is a great challenge by altering the reservoir rock wettability. The purpose of this study is to compare the results of low-salinity waterflooding in secondary and tertiary modes to decrease the residual oil saturation from limestone reservoirs. Three different stock-tank crude oils and limestone cores are used in this study. All of the coreflooding experiments were performed at 60 degrees C and 2000 psi by injection of actual formation and seawater, with brine solutions containing single-component salt, such as MgSO4, KCl, Na2SO4, CaCl2, MgCl2, and NaCl, with a wide range of salinity levels. During low-salinity flooding in secondary recovery, the dominant displacement-suggested mechanism is snap-off, which results in an oil recovery factor with different values for the various wettability conditions. The most interesting result is that tertiary low-salinity recovery was never observed in these coreflooding experiments. The measured effect of tertiary low-salinity waterflooding from limestone core experiments was rock dissolution, as a result of surface reactions, and an increase in water relative permeability.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available