Preparation method of in-situ nano emulsifier and oil reservoir application method

An application method and emulsifier technology, applied in the direction of chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve the problems of aggravated agglomeration behavior and easy agglomeration, and achieve good injectability, low processing difficulty, The effect of enhanced oil recovery

Active Publication Date: 2021-01-26
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

The premise of the application of nano-microscale solid particles in the oil field is that the nano-microscale solid particles have good stability in the reservoir environment (temperature, salinity). However, the unmodified nano-microscale solid particles Phase particles are prone to agglomeration due to high surface energy, and the reservoir environment intensifies the agglomeration behavior

Method used

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  • Preparation method of in-situ nano emulsifier and oil reservoir application method
  • Preparation method of in-situ nano emulsifier and oil reservoir application method
  • Preparation method of in-situ nano emulsifier and oil reservoir application method

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Embodiment 1

[0044] (1) Synthesis of an in-situ nanoemulsifier

[0045] (a) Synthesis of in situ nanoemulsifier 1

[0046] Add 80g of deionized water to a 500mL three-necked bottle, then add 5g of ferric chloride hydrate and 1.2g of ferrous sulfate hydrate in sequence, and stir at room temperature for 45min to 60min to ensure full dissolution. Dissolve 0.75 g of oleic acid diethanolamide in 12 g of ethanol under ice-salt bath conditions, seal and stir for 15 min to ensure full dissolution. Under the protection of nitrogen, add 25% 75mL ammonia water and ethanol solution dissolved with oil-soluble surfactant to the three-necked bottle through two dropping funnels at a constant speed for 2 hours, and stir rapidly during the dropping process to ensure that the reaction system is mixed. uniform. Stirring was continued for 1 h after the dropwise addition. After the reaction was completed, the reaction product was suction-filtered, and the solid product was collected, dried in vacuum at 50° C...

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Abstract

The invention discloses a preparation method of an in-situ nano-emulsifier and an oil reservoir application method, the in-situ nano-emulsifier is successfully prepared, the property of the in-situ nano-emulsifier is weakly hydrophobic and oleophylic nano colloidal particles, and the nano-emulsifier provided by the invention is directly dispersed by injecting water into an oil field, is slightly higher than the injected water in viscosity, and is high in injectivity; under the condition that the water saturation of an oil reservoir is 25-85%, water-in-oil Pickering emulsion with stable dynamics is generated through the reverse phase bending effect of an oil-water interface and crude oil, the water-in-oil Pickering emulsion does not generate phase change in the range of the water saturationof the oil reservoir, and the viscosity of the Pickering emulsion is in direct proportion to the water saturation of a stratum and is in inverse proportion to the oil saturation. The viscosity of theemulsified liquid is 1.5-20 times that of crude oil, the viscosity of the emulsified liquid in a high-permeability area is higher than that of the emulsified liquid in a low-permeability area, the fluidity can be adaptively controlled, the displacement leading edge can be stabilized, intelligent oil displacement is achieved, and the crude oil recovery rate is increased to the maximum extent.

Description

technical field [0001] The present invention relates to the application of in-situ nano-emulsified intelligent oil displacement agent in oil reservoirs, in particular in-situ nano-emulsified intelligent oil-displaced agent and its application method in crude oil recovery, belonging to colloid and interface chemistry, oil field chemistry and oil field field of mining technology. Background technique [0002] The mobility of injected water in water flooding development reservoirs is obviously higher than that of crude oil. Affected by unfavorable water-oil mobility ratio, viscous fingering is easily formed at the displacement front, and the sweep efficiency of water flooding is low; The high-permeability layer advances, the water channeling in the high-permeability zone is serious, the heterogeneity of the reservoir further deteriorates, and a large amount of crude oil is not affected. The above two reasons lead to the high water content of the produced fluid and the low reco...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/588C09K8/58E21B43/22
CPCC09K8/584C09K8/588C09K8/58E21B43/16C09K2208/10
Inventor 蒲万芬刘锐石国新袁述武罗强杜代军孙琳
Owner SOUTHWEST PETROLEUM UNIV
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