CN113237795B - Method for evaluating expansion viscoelastic salt effect of foam liquid film - Google Patents

Method for evaluating expansion viscoelastic salt effect of foam liquid film Download PDF

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CN113237795B
CN113237795B CN202110512491.8A CN202110512491A CN113237795B CN 113237795 B CN113237795 B CN 113237795B CN 202110512491 A CN202110512491 A CN 202110512491A CN 113237795 B CN113237795 B CN 113237795B
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foam
surface tension
foam system
liquid film
dynamic surface
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CN113237795A (en
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孙琳
唐浩然
张永昌
蒲万芬
陈德全
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Sichuan University
Southwest Petroleum University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N13/02—Investigating surface tension of liquids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N2013/003—Diffusion; diffusivity between liquids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N13/02—Investigating surface tension of liquids
    • G01N2013/0241—Investigating surface tension of liquids bubble, pendant drop, sessile drop methods
    • G01N2013/025—Measuring foam stability
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N13/02—Investigating surface tension of liquids
    • G01N2013/0283—Investigating surface tension of liquids methods of calculating surface tension

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Abstract

The invention discloses a method for evaluating the expanding viscoelastic salt effect of a foam liquid film, which comprises the following steps: step S10, determining the dynamic surface tension curve of the foam system according to the conventional dynamic surface tension measuring method; step S20, determining the diffusion coefficient of the foam system at the initial adsorption stage according to the dynamic surface tension curve of the foam system; s30, repeating the steps S10-S20 to obtain diffusion coefficients of the foam system at the initial adsorption stage under different salinity; and step S40, evaluating the expanding viscoelastic salt effect of the foam liquid film according to the diffusion coefficient of the foam system at the initial adsorption stage under different salinity. Based on the generation reason of surface expansion viscoelasticity, the method utilizes dynamic surface tension test to replace expansion modulus test to evaluate the influence of salinity on the viscoelasticity of the foam liquid film, greatly reduces the threshold of a test instrument, reduces the experiment cost, and is quick, accurate and reliable.

Description

Method for evaluating expansion viscoelastic salt effect of foam liquid film
Technical Field
The invention relates to a method for evaluating the expansion viscoelastic salt effect of a foam liquid film, belonging to the technical field of oil and gas field development.
Background
After the oil field in China is continuously developed in large scale for more than half a century, high-quality reserves are scarce, the reserves of heterogeneous high-salt oil reservoirs which are generally distributed in the whole country are gradually the key points for increasing storage and increasing production, and how to improve the recovery ratio becomes a difficult challenge facing us. The foam flooding has the characteristics of a gas-liquid dual displacement medium, not only has good fluidity control capability and certain oil washing capability, but also has temperature resistance and salt resistance compared with common chemical flooding, so that the foam flooding has obvious technical advantages in the development of heterogeneous high-salt oil reservoirs. Numerous studies have shown that the effect of enhanced recovery from foam flooding is closely related to the stability of the foam in the reservoir, which is largely controlled by its liquid film expansion viscoelasticity. Therefore, in order to fully exert the oil displacement potential of the foam flooding in a high-salt oil reservoir, the salt effect of the expansion viscoelasticity of the foam liquid film must be clearly mastered.
The extensional viscoelasticity of a foamed liquid film is generally quantitatively characterized by a surface extensional modulus. The surface expansion modulus is the ratio of the change in surface tension to the change in surface area when the surface is subjected to cyclic compression and expansion. When the foam liquid film expands, if the surface tension gradient on the nascent surface disappears rapidly, the surface expansion modulus will be small and the liquid film expansion viscoelasticity will be correspondingly weak. The measurement of the surface expansion modulus is classified into a Langmuir groove method and a droplet (bubble) expansion method. The Langmuir groove method is based on Langmuir grooves, the compression or expansion of the surface being achieved by the movement of the sliding barrier. According to different sliding barrier movement modes, the Langmuir groove method can be divided into a surface wave method, a steady state method, an interfacial tension relaxation method and the like. Droplet (bubble) expansion methods are typically performed using a droplet profile analyzer, and surface compression or expansion is achieved by periodically changing the size of the droplets (bubbles). The Langmuir groove method and the liquid drop (bubble) expansion method have technical advantages respectively, but the Langmuir groove method and the liquid drop (bubble) expansion method need to rely on expensive test instruments such as an interface expansion rheometer, which undoubtedly raises the threshold of researchers for understanding the expansion viscoelasticity of a foam liquid film and severely restricts the application and development of the foam flooding.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a method for evaluating the expanding viscoelastic salt effect of a foam liquid film, wherein the strength of the expanding viscoelasticity of the foam liquid film is related to the size of the surface tension gradient on the nascent liquid film, and the size of the surface tension gradient on the nascent liquid film is controlled by the adsorption rate of a foam system from a bulk phase to the surface. Because the initial adsorption rate is quantitatively higher than the later adsorption rate, the adsorption rate plays an absolute control role in the surface tension gradient. Therefore, the influence of salinity on the initial adsorption rate of the foam system can be analyzed to obtain the influence on the expansion viscoelasticity of the foam liquid film, and the initial adsorption rate of the foam system can be obtained by utilizing a dynamic surface tension curve.
The technical scheme provided by the invention for solving the technical problems is as follows: a method of evaluating the expanding viscoelastic salt effect of a foamed liquid film comprising:
step S10, determining the dynamic surface tension curve of the foam system according to the conventional dynamic surface tension measuring method;
step S20, determining the diffusion coefficient of the foam system at the initial adsorption stage according to the dynamic surface tension curve of the foam system;
s30, repeating the steps S10-S20 to obtain diffusion coefficients of the foam system at the initial adsorption stage under different salinity;
and step S40, evaluating the expanding viscoelastic salt effect of the foam liquid film according to the diffusion coefficient of the foam system at the initial adsorption stage under different salinity.
The further technical scheme is that the conventional dynamic surface tension attenuation measuring method is one of a pendant drop method, a drop volume method and a maximum bubble pressure method.
The further technical scheme is that the step S20 includes the following steps:
step S21, drawing a relation curve of the surface tension of the foam system and the square root of time according to the dynamic surface tension curve of the foam system;
s22, fitting and calculating the slope of a left straight line segment of a relation curve of the surface tension of the foam system and the square root of time;
and step S23, calculating the diffusion coefficient of the foam system at the initial adsorption stage according to the slope of the straight line segment on the left side of the relation curve.
The further technical solution is that the calculation formula in step S23 is:
Figure BDA0003060883990000031
in the formula: c. C 0 Is the bulk concentration of the surfactant, mol/L; r is a gas constant of 8.314J/(mol.K); t is absolute temperature, K.
According to a further technical scheme, in the step S30, at least two diffusion coefficients at the initial adsorption stage of the foam system under different salinity are obtained.
The further technical scheme is that the evaluation criteria in step S40 are:
if the diffusion coefficient increases with increasing salinity, the salt reduces the extensional viscoelasticity of the foam liquid film;
if the diffusion coefficient decreases with increasing salinity, the salt synergizes the extensional viscoelasticity of the foam liquid film.
The invention has the following beneficial effects:
1. based on the generation reason of surface expansion viscoelasticity, the influence of salinity on the viscoelasticity of the foam liquid film is evaluated by replacing an expansion modulus test with a dynamic surface tension test, and the method is scientific and reliable;
2. the invention reduces the instrument threshold of the expansion viscoelasticity evaluation, reduces the experiment cost, and is quick, accurate and reliable;
3. the dynamic surface tension curve can be completed by various dynamic surface tension test instruments, and has the advantages of simplicity, convenience and easiness in popularization.
Drawings
FIG. 1 is a graph of the effect of salinity on 0.2% AB dynamic surface tension in example 1;
FIG. 2 is a plot of surface expansion viscoelasticity at 0.2% AB at different salinity for example 1;
FIG. 3 is a graph of the effect of salinity on the 0.2% HH dynamic surface tension in example 2;
FIG. 4 is a surface extensional viscoelasticity plot of 0.2% HH at different salinity in example 2.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a method for evaluating the expanding viscoelastic salt effect of a foam liquid film, which comprises the following steps of:
step S10, testing a dynamic surface tension curve gamma (t) -t of the foam system by using a conventional dynamic surface tension measuring method such as a pendant drop method, a drop volume method, a maximum bubble pressure method and the like;
step S20, determining the diffusion coefficient of the foam system at the initial adsorption stage according to the dynamic surface tension curve of the foam system;
step S21, drawing a relation curve gamma (t) -t of the surface tension of the foam system and the square root of time according to the dynamic surface tension curve of the foam system 0.5 ；
Step S22, fitting and calculating a relation curve gamma (t) -t of the surface tension of the foam system and the square root of time 0.5 Slope of the left straight line segment;
step S23, calculating the diffusion coefficient of the foam system in the initial adsorption stage according to the slope of the straight line segment on the left side of the relation curve (namely the straight line segment in the initial adsorption stage);
Figure BDA0003060883990000041
in the formula: c. C 0 Is the bulk concentration of the surfactant, mol/L; r is a gas constant of 8.314J/(mol.K); t is absolute temperature, K;
s30, repeating the steps S10-S20 to obtain diffusion coefficients of the foam system at the initial adsorption stage under different salinity;
s40, evaluating the influence of salinity on the expansion viscoelasticity of the foam liquid membrane according to the characteristic frequency with the largest numerical value in the foam system bulk phase-surface diffusion exchange relaxation process under different salinity;
if the diffusion coefficient increases with increasing salinity, the salt reduces the extensional viscoelasticity of the foam liquid film;
if the diffusion coefficient decreases with increasing salinity, the salt synergizes the extensional viscoelasticity of the foam liquid film.
Example 1
The invention discloses a method for evaluating the expanding viscoelastic salt effect of a foam liquid film, which comprises the following steps of:
step 1, determining a dynamic surface tension curve gamma (t) -t of 0.2% AB of a foam system under 1.2mol/LNaCl, as shown in figure 1;
step 2, drawing gamma (t) -t of 0.2 percent AB under two salinity 0.5 Fitting and calculating the slope of the straight line segment at the initial adsorption stage; the diffusion coefficient D at the initial stage of adsorption was calculated according to the formula (1), and the result is shown in table 1;
step 3, repeating the steps 1-2 to obtain the diffusion coefficient D of the foam system at the initial adsorption stage under the condition of 2.4mol/LNaCl, wherein the result is shown in the table 1;
TABLE 1
NaCl concentration (mol/L) 1.2 2.4
D(10 -12 m 2 /s) 2.32 3.69
Step 4, according to table 1, the diffusion coefficient increases with increasing salinity, meaning that the salt reduces the extensional viscoelasticity of the foam liquid film.
The results of measuring the surface extensional viscoelasticity at 0.2% AB under 1.2mol/L and 2.4mol/L NaCl by the vibration drop method are shown in FIG. 2. The graph shows that salinity increases and the extensional viscoelasticity of the frothed liquid film decreases. This conclusion is consistent with that obtained using the test method of the present invention.
Example 2
The invention discloses a method for evaluating the expanding viscoelastic salt effect of a foam liquid film, which comprises the following steps of:
step 1, determine the dynamic surface tension curve γ (t) -t of 0.2% HH of the foam system at 2.4mol/LNaCl, as shown in FIG. 3;
step 2, drawing gamma (t) -t of HH with 0.2 percent under two salinity 0.5 Fitting and calculating the slope of the straight line segment at the initial adsorption stage; the diffusion coefficient D at the initial stage of adsorption was calculated according to the formula (1), and the result is shown in table 2;
step 3, repeating the steps 1-2 to obtain the diffusion coefficient D of the foam system at the initial adsorption stage under the condition of 3.6mol/LNaCl, wherein the result is shown in the table 2;
TABLE 2
NaCl concentration (mol/L) 2.4 3.6
D(10 -12 m 2 /s) 7.49 4.07
Step 4, according to table 2, the diffusion coefficient decreased with increasing salinity, meaning that the salt synergized the extensional viscoelasticity of the foam liquid film.
The surface extensional viscoelasticity of 0.2% HH at 2.4mol/L and 3.6mol/L NaCl was measured by the shaking drop method, and the results are shown in FIG. 4.
The graph shows that salinity increases and the extensional viscoelasticity of the foamed liquid film increases. This conclusion is consistent with that obtained using the test method of the present invention.
Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention.

Claims (2)

1. A method for evaluating the effect of expanding viscoelastic salts on a foamed liquid film, comprising:
step S10, determining the dynamic surface tension curve of the foam system according to the conventional dynamic surface tension measuring method;
step S20, determining the diffusion coefficient of the foam system at the initial adsorption stage according to the dynamic surface tension curve of the foam system;
step S21, drawing a relation curve of the surface tension of the foam system and the square root of time according to the dynamic surface tension curve of the foam system;
s22, fitting and calculating the slope of a left straight line segment of a relation curve of the surface tension of the foam system and the square root of time;
s23, calculating the diffusion coefficient of the foam system at the initial adsorption stage according to the slope of the straight line segment on the left side of the relation curve;
Figure FDA0003788295890000011
in the formula: c. C 0 Is the bulk concentration of the surfactant, mol/L; r is a gas constant of 8.314J/(mol.K); t is absolute temperature, K;
s30, repeating the steps S10-S20 to obtain diffusion coefficients of the foam system at the initial adsorption stage under different salinity;
at least obtaining diffusion coefficients of the foam system at the initial adsorption stage under different salinity in the step S30;
step S40, evaluating the expansion viscoelastic salt effect of the foam liquid film according to the diffusion coefficient of the foam system at the initial adsorption stage under different salinity;
if the diffusion coefficient increases with increasing salinity, the salt reduces the extensional viscoelasticity of the foam liquid film;
if the diffusion coefficient decreases with increasing salinity, the salt synergizes the extensional viscoelasticity of the foam liquid film.
2. The method for evaluating the expanding viscoelastic salt effect of the foamed liquid film according to claim 1, wherein the conventional dynamic surface tension decay determination method is one of a pendant drop method, a drop volume method and a maximum bubble pressure method.
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