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High-stability oil displacement foam system and preparation method thereof

A technology of foam system and high stability, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of foam stability decline, affecting the recovery rate of oil field foam flooding, etc., to prevent oil droplets from coalescing , Improve the performance of emulsification and washing oil, and the effect of high product conversion rate

Pending Publication Date: 2021-01-22
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the foam has a decay period. With the diffusion of gas and the discharge of liquid, the stability of the foam will drop sharply, which will affect the recovery factor of foam flooding in the oil field.

Method used

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  • High-stability oil displacement foam system and preparation method thereof
  • High-stability oil displacement foam system and preparation method thereof
  • High-stability oil displacement foam system and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 0.001g of graphene oxide nanosheets and fully ultrasonically disperse them in 99.7g of simulated formation ionic water (salinity 20000ppm), then add 0.3g of sodium dodecylbenzene sulfonate, and magnetically stir for 10min to obtain the foaming agent concentration 0.3wt%, the graphene oxide nanosheet concentration is 0.001wt% of the foaming system formula. Then adopt the Waring-Blender method, stir at 30°C and 2700r / min for 3min for foaming, and then record the foaming volume, liquid separation half-life and foam half-life. After the foam completely collapses and disappears, take 5mL of the foaming system and an equal volume of crude oil in a quartz tube to test the emulsification performance.

Embodiment 2

[0037] Weigh 0.002g of graphene oxide nanosheets and fully ultrasonically disperse them in 99.7g of simulated formation ion water (salinity 20000ppm), then add 0.3g of sodium dodecylbenzene sulfonate, and magnetically stir for 10min to obtain the foaming agent concentration 0.3wt%, graphene oxide nanosheet concentration of 0.002wt% of the foaming system formula. Then adopt the Waring-Blender method, stir at 30°C and 2700r / min for 3min for foaming, and then record the foaming volume, liquid separation half-life and foam half-life. After the foam completely collapses and disappears, take 5mL of the foaming system and an equal volume of crude oil in a quartz tube to test the emulsification performance.

Embodiment 3

[0039] Weigh 0.003g of graphene oxide nanosheets and fully ultrasonically disperse them in 99.7g of simulated formation ion water (salinity 20000ppm), then add 0.3g of sodium dodecylbenzenesulfonate, and stir magnetically for 10min to obtain the foaming agent concentration 0.3wt%, the graphene oxide nanosheet concentration is 0.003wt% of the foaming system formula. Then adopt the Waring-Blender method, stir at 30°C and 2700r / min for 3min for foaming, and then record the foaming volume, liquid separation half-life and foam half-life. After the foam completely collapses and disappears, take 5mL of the foaming system and an equal volume of crude oil in a quartz tube to test the emulsification performance.

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Abstract

The invention discloses a high-stability oil displacement foam system, which comprises a foaming agent, a stabilizer and water, the foaming agent comprises sodium benzenesulfonate, the stabilizer comprises graphene oxide nanosheets, and the water comprises ionized water. By adding the graphene oxide nanosheets, the graphene oxide nanosheets are adsorbed on a gas-liquid interface forming bubbles, so that gas diffusion is reduced, meanwhile, the nanosheets can be retained at a Plaateau boundary to prevent liquid in a liquid film from being rapidly separated out, and the stability of the foam isgreatly improved; the amphipathy of the graphene oxide nanosheet plays a role in surface activity at the same time, so that the surface tension of the system is reduced, the foam is more stable, and the foaming performance of the system is also improved; the graphene oxide nanosheets can also be adsorbed on the surfaces of tiny oil drops dispersed in the liquid, so that the oil drops are preventedfrom coalescing, and the emulsifying and oil washing performance of a foam system is improved. The preparation method is simple and controllable in process, high in product conversion rate and few inbyproducts, and can be widely applied to actual production.

Description

technical field [0001] The invention relates to a foam system and a preparation method thereof, in particular to a high-stability oil displacement foam system and a preparation method thereof. Background technique [0002] The internal geology of the reservoir is complex, and the formation is naturally heterogeneous and naturally fractured. Especially in the secondary development process, most oil wells need to undergo high-pressure fracturing. After water flooding, not only the water content will rise rapidly, but also the heterogeneity of the formation will be further aggravated. As a result, the displacement fluid quickly breaks through the dominant channel during the oil displacement process, resulting in water and gas channeling, and the limited coverage of the reservoir, which brings great difficulties to oilfield development. [0003] Because foam itself can reduce gas-water mobility, block high permeability without blocking low permeability, and block water without ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 章峻杨陆涛莫宏沈健何磊张鲁霞王磊代勇
Owner NANJING NORMAL UNIVERSITY
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