| Da Gang oil field Guan 109-1 fault block reservoirs in SP flooding period to effectively improve the displacement efficiency of oil technical problems.Through the analysis of Guan 109-1 fault block oil reservoir geology and reservoir characteristics.The analysis shows that the reservoir is difficult to improve the efficiency of oil displacement.Results show that: the reservoir and micro heterogeneity is strong.Polymer flooding can effectively block the pore throats,but microscopic heterogeneity differences caused by small pore structure and wettability is unresolved.To further improve the polymer concentration could lead to a decline in the reservoir permeability.Based on the research of nano poly silicon materials,the following experiments were carried out in this paper,aiming at the micro heterogeneity of the wettability of the 109-1 area:Based on nano poly silicon material selection principle,from the wettability,stability and adsorption of selection for nano materials in Guan 109-1 formation;analysis of the preferred nano poly silicon material NPS-L micro structure and functional keys.Experimental design of preferred nano poly silicon material NPS-L mechanism of rock: the analysis of the surface adsorption in the rock,change the wettability of rock,adsorption of rocks before and after the oil-water relative permeability and capillary pressure changes.Based on the above experimental results,further research NPS-L in SP flooding,NPS-L in rock surface adsorption,change the wettability of rock,relative permeability and capillary pressure variations to determine the appropriate polymer and surface active agent concentration,and transparent microscopic simulation model of oil displacement experiments to verify its validity,finally integrated oil displacement experiment comparison of SP flooding and auxiliary nano SP flooding recovery rate to determine the suitable concentration of NPS-L?... |
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