In-situ emulsification tackifying system with high phase transformation point and application in water-drive reservoirs
A phase transition point, in-situ technology, applied in the fields of production fluids, drilling compositions, chemical instruments and methods, etc., can solve the problems of difficult formation propagation, high injection pressure, affecting production, etc., and achieve outstanding economic benefits and injection. Good performance, and the effect of improving oil recovery
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[0033] Example 1 Oil-water interfacial tension of in-situ emulsification thickening system with high phase transition point
[0034] Table 1 The stable interfacial tension of in-situ emulsification system with high phase transition point and crude oil
[0035] Salinity (10 4 mg / L)
[0036] Respectively prepare total salinity of 0.1×10 4 mg / L number①, 1.0×10 4 mg / L number②,10×10 4 mg / L number ③, 20×10 4 mg / L mineralized water number ④ (①~④ medium Ca 2+ , Mg 2+ The mass concentration of is 5.0% of the total salinity), stirring for 1.5 hours. Add 0.25% petroleum sulfonate, 0.45% propylene glycol monostearate, 0.05% liquid paraffin, 0.05% carboxymethyl-β-cyclodextrin in ①; add 0.25% in ② Cocamidopropyl betaine, 0.45% polyoxyethylene sorbitan monostearate, 0.05% graphite powder, 0.05% chitosan quaternary ammonium salt; add 0.25% fatty alcohol ether in ③ Sulfonate, 0.45% oleic acid diethanolamide, 0.05% graphite powder, 0.05% xanthan gum; add 0.25% alkanolamide, 0.45% dodecylamine, 0...
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[0038] Example 2 Viscosity of in-situ emulsification thickening system containing high phase transition point and crude oil to form emulsion
[0039] Respectively prepare total salinity of 0.1×10 4 mg / L number①, 1.0×10 4 mg / L number②,10×10 4 mg / L number ③, 20×10 4 mg / L mineralized water number ④ (①~④ medium Ca 2+ , Mg 2+ The mass concentration of is 5.0% of the total salinity), stirring for 1.5 hours. Add 0.25% petroleum sulfonate, 0.45% propylene glycol monostearate, 0.05% liquid paraffin, 0.05% carboxymethyl-β-cyclodextrin in ①; add 0.25% in ② Cocamidopropyl betaine, 0.45% polyoxyethylene sorbitan monostearate, 0.05% graphite powder, 0.05% chitosan quaternary ammonium salt; add 0.25% fatty alcohol ether in ③ Sulfonate, 0.45% oleic acid diethanolamide, 0.05% graphite powder, 0.05% xanthan gum; add 0.25% alkanolamide, 0.45% octadecyl primary amine, 0.05% in ④. Cage polysilsesquioxane, 0.05% guar gum; stirring for 2.0 hours to obtain an in-situ emulsification and viscosity-increa...
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[0049] Example 3 Enhanced oil recovery performance of in-situ emulsification viscosity-increasing system with high phase transition point
[0050] The formulated salinity is 20×10 4 mg / L(Ca 2+ , Mg 2+ The mass concentration is 5.0% of the total salinity) of mineralized water, stirred for 1 hour, followed by adding 0.25% alkanolamide, 0.15% octadecyl primary amine, 0.30% oleic acid diethanolamide, 0.05 % Cage polysilsesquioxane, 0.05% xanthan gum; stirred for 2.0 hours to obtain an in-situ emulsified viscosity-increasing system with high phase transition point. Artificial simulated core (45×45×300mm long core, porosity 25%, gas permeability 2000mD), temperature 90℃, crude oil viscosity 60.8mPa·s, original oil saturation 72%, in the water drive stage (water drive speed 2.0mL / min). Affected by the unfavorable water-to-oil mobility ratio, the recovery of crude oil by water flooding is low, and the recovery rate with a water cut of 98% is about 40%; subsequent injection with a high ph...
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