Abstract
In this study, the new type of polymer was considered for rheological study and core flooding test in high temperature and high salinity (HTHS) condition. This polymer is called co-polymer Zetag 8187G which is used as flocculant in water industry. By studding the rheological properties of this polymer compared to one of the commercial polymer for HTHS condition, Zetag 8187G was considered for polymer flooding in sandstone core at 185 °F and 150,000 ppm of salinity in present of divalent ions (Ca2+, Mg2+) in experimental and simulation cases due to better stability compared to other. The core flooding results showed this co-polymer swept the oil toward low residual oil saturation in porous media. In addition, the core flooding results showed that was not occurred significant damage in rock during polymer flooding using Zetag 8187G. More than, in the simulation case, the change of relative permeability curve during water and polymer flooding was obtained using history matching of production data. The experimental and simulation results show this polymer can applicable in oil industry as well as application in water industry.
Highlights
World energy demand is increasing as the developed and developing of the industry
The polymer flooding is applied in high temperature (185 °F) and high salinity (150,000 ppm in presents of Ca2+, Mg2+) in low permeability sandstone
For investigation the effect of salinity and presents of the divalent ions in high temperature, as shown in Fig. 7, by increasing salinity in 185 °F the viscosity of solutions were decreased
Summary
World energy demand is increasing as the developed and developing of the industry. Today, fossil fuels, especially oil and gas, play a major role in providing energy. The polymer flooding is applied in high temperature (185 °F) and high salinity (150,000 ppm in presents of Ca2+, Mg2+) in low permeability sandstone. When the core flooding (as sown in Fig. 4) producer reached to connate water saturation, 4 constant pressure point were considered for estimating the oil permeability.
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