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A method for evaluating the effect of salinity on the viscoelasticity of foam liquid film expansion

A technology of foam liquid and viscoelasticity, which is applied in the field of evaluating the influence of salinity on the viscoelasticity of foam liquid film expansion, which can solve the problems of complex, expensive, and time-consuming testing process, and achieve the effect of simple fitting calculation and easy implementation

Active Publication Date: 2022-07-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Langmuir trough method and the droplet (bubble) expansion method can accurately measure the expansion viscoelasticity of the foam liquid film, but they all need to use expensive high-precision testing instruments, and the testing process is complicated and time-consuming

Method used

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  • A method for evaluating the effect of salinity on the viscoelasticity of foam liquid film expansion
  • A method for evaluating the effect of salinity on the viscoelasticity of foam liquid film expansion
  • A method for evaluating the effect of salinity on the viscoelasticity of foam liquid film expansion

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Experimental program
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Embodiment 1

[0046] A method for evaluating the influence of salinity on the viscoelasticity of foam liquid film expansion comprises the following steps:

[0047] Step 1. Determine the surface tension decay curve of the foam system with 0.2% OH:

[0048] Step 11. Use a pendant drop method surface tension tester to dispense a drop of 9-10 μl of 0.2% OH solution prepared with 0.4mol / L NaCl saline from the syringe, and monitor the surface tension of the droplet;

[0049]Step 12. When the surface tension of the droplet reaches equilibrium, a certain volume of OH solution is injected from the syringe within 1s to increase the droplet surface area by 10%; the surface tension is recorded from the first moment when the droplet surface area expansion ends, until its value reaches Equilibrium; take the difference Δγ(t) between the surface tension and the equilibrium surface tension at each moment as the ordinate, and the time t as the abscissa to draw a graph, that is, the surface tension decay curv...

Embodiment 2

[0059] A method for evaluating the influence of salinity on the viscoelasticity of foam liquid film expansion comprises the following steps:

[0060] Step 1. Determine the surface tension decay curve of the foam system at 0.2% OD:

[0061] Step 11. Use a pendant drop surface tension tester to dispense a drop of 9-10 μl of 0.2% OD solution prepared with 0.4mol / L NaCl saline from a syringe, and monitor the surface tension of the drop;

[0062] Step 12. When the surface tension of the droplet reaches equilibrium, a certain volume of OD solution is injected from the syringe within 1s to increase the droplet surface area by 15%; the surface tension is recorded from the first moment when the droplet surface area expansion ends, until its value reaches Equilibrium; take the difference Δγ(t) between the surface tension and the equilibrium surface tension at each moment as the ordinate, and the time t as the abscissa to draw a graph, that is, the surface tension decay curve of 0.2% OD ...

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Abstract

The invention discloses a method for evaluating the influence of salinity on the viscoelasticity of foam liquid film expansion, comprising: step S10, determining the surface tension decay curve of the foam system according to a conventional dynamic surface tension decay measurement method; step S20, according to the surface tension of the foam system The decay curve obtains the characteristic frequency with the largest numerical value in the process of bulk-surface diffusion exchange relaxation of the foam system; step S30, repeating steps S10-S20, obtains the characteristic frequency with the largest numerical value in the process of bulk-surface diffusion exchange relaxation of the foam system under different salinities Eigenfrequencies; Step S40, evaluating the influence of salinity on the expansion viscoelasticity of the foam liquid film according to the characteristic frequency with the largest value in the process of bulk-surface diffusion exchange relaxation of the foam system under different salinities. The present invention is established based on the formation mechanism of surface expansion viscoelasticity, involves mature testing technology, common testing instruments, and simple fitting and calculation. Therefore, the method has the characteristics of reliability, accuracy, simplicity, and easy implementation.

Description

technical field [0001] The invention relates to a method for evaluating the influence of salinity on the viscoelasticity of foam liquid film expansion, and belongs to the technical field of oil and gas field development. Background technique [0002] High-salt oil reservoirs are widely distributed on land in my country. They are generally highly heterogeneous, with prominent intra- and inter-layer contradictions, and most of them have entered the stage of high water-cut development. Foam flooding has significant technical advantages in the development of such reservoirs due to its strong mobility control ability and good salt tolerance. The presence of salt changes various properties of the foam, including its liquid film expansion viscoelasticity. The viscoelasticity of liquid film expansion will affect the process of foam drainage, coarsening and coalescence, and is closely related to the stability of foam. Therefore, understanding the effect of salinity on the viscoelas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00G01N13/02
CPCG01N13/00G01N13/02G01N2013/003G01N2013/0233G01N2013/025G01N2013/0283
Inventor 孙琳张永昌蒲万芬吴艳平杜代军
Owner SOUTHWEST PETROLEUM UNIV