Abstract
ABSTRACT Inorganic precipitant profile control system has good solubility and temperature tolerance compared with the polymer-based gel system. However, the precipitates form rapidly when the reactants contact. In this paper, it is reported a dilute induced inorganic precipitant for profile control for high salinity reservoirs with high total concentrations of calcium and magnesium ions. The experimental results showed that when sodium carbonate and precipitation inhibitor were injected into the high-salinity reservoir, the introduction of precipitation inhibitor can temporarily inhibit the formation of precipitation. When the system was diluted to the initial dilution times for generating the precipitates, the precipitation inhibitor lost the inhibitory effect on the precipitation reaction, and the profile modification system will produce precipitates to play the role of water shutoff. Furthermore, this dilute induced inorganic precipitant system can be injected into the moderate and low permeability reservoirs without blockage in the wellbore, and the water shutoff rate can reach above 60%.
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