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Abstract
In order to solve the problem that polymer gel is not suitable for profile control in high temperature and high salinity reservoirs, a good inorganic profile control agent (Na2O · mSiO2) is studied in this article. The results show that sodium silicate in high temperatures and high salinity can self-generate white precipitation, which can effectively block high permeability zones and/or thief zones and expand sweep volume. The precipitation mass is related to modulus, temperature, salinity, and aging time in high temperatures. Sand-packed models experiments indicate that sodium silicate in high temperatures and high salinity has a good blocking and oil displacement effect, which can further enhance oil recovery. Field application results also confirm that sodium silicate is a good inorganic profile control agent in high temperature and high salinity reservoir.
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