Oil-displacing agent for enhancing crude oil recovery efficiency in tertiary recovery
An oil displacement agent and recovery factor technology, which is applied in the construction of a polymer-surfactant pure binary oil displacement system for enhanced oil recovery in the third oil recovery. It can improve the oil recovery rate, reduce the production cost, and have good environmental protection effects.
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Embodiment 1
[0034] Polyacrylamide 18.0g, sodium dodecylbenzene sulfonate 3.0g, gemini surfactant 2.0g, alkylphenol polyoxyethylene ether 5.0g, alkylphenol polyoxyethylene ether sodium 10.0g, methanol 15.0g and 10,000g of clean water were added to a mixer equipped with a stirring device, and stirred at room temperature for 2.0h to prepare an oil displacing agent.
[0035] At a temperature of 80°C and a salinity of 25000mg / L (Ca 2+ +Mg 2+ =552mg / L), DV-II type Brookfield viscometer (UL connector) is at 30 rev / min conditions, and the recorded viscosity is 16.5mPa.S; Use TX-500C interfacial tensiometer, at rotational speed 5000 rev / min conditions , the lowest interfacial tension is 2.6×10 -3 mN / m.
Embodiment 2
[0037] 16.0g of modified polyacrylamide, 2.0g of carboxylic betaine betaine, 2.0g of fatty alcohol polyoxyethylene ether, 3.0g of sulfoimidazoline betaine, 6.0g of sodium alkylphenol polyoxyethylene ether sulfonate, ethanol 13.0g, 10000g of clean water (or reinjected sewage) were added to a mixer equipped with a stirring device, and stirred at room temperature for 2.5h. Prepare oil displacing agent.
[0038] At a temperature of 80°C and a salinity of 25000mg / L (Ca 2+ +Mg 2+ =552mg / L), DV-II type Brookfield viscometer (UL connector) is at 30 rev / min conditions, and the recorded viscosity is 17.5mPa.S; Use TX-500C interfacial tensiometer, at rotational speed 5000 rev / min conditions , the lowest interfacial tension is 3.1×10 -3 mN / m.
Embodiment 3
[0040] Add 15.0g of xanthan gum, 3.0g of sodium dodecylbenzenesulfonate, 6.0g of petroleum carboxylate, 1.5g of carboxybetaine, 2.0g of sulfoimidazoline betaine, 16.0g of methanol, and 10,000g of clear water into the container In a mixer with a stirring device, stir at room temperature for 2.5h. Prepare oil displacing agent.
[0041] At a temperature of 80°C and a salinity of 25000mg / L (Ca 2+ +Mg 2+=552mg / L), the DV-II type Brookfield viscometer (UL connector) is at 30 rev / min conditions, and the recorded viscosity is 12.5mPa.S; Use TX-500C interfacial tensiometer, at rotational speed 5000 rev / min conditions , the lowest interfacial tension is 5.0×10 -3 mN / m.
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