Method for measuring and evaluating emulsifying property of surfactant

A surfactant and emulsifying performance technology, which is applied in the fields of scattering characteristic measurement, measuring device, transmittance measurement, etc., can solve the problems of inability to reflect the aggregation stability of the emulsion, fuzzy interface between the oil phase and the emulsion phase, and difficulty in accurately measuring the amount of emulsified oil, etc. problems, to achieve the effects of enriching measurement and evaluation methods, avoiding human error interference, good operability and practicability

Active Publication Date: 2019-04-30
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it can reflect the emulsifying properties of surfactants to a certain extent, there are still some problems: the evaluation of emulsifying properties of surfactants should not only include emulsion stability, but also factors such as the amount of emulsified oil; It is related to the aggregation stability and the aggregation stability of the emulsion. It is necessary to comprehensively consider these two influencing factors; however, due to the fuzzy interface between the oil phase and the emulsion phase, it is difficult to accurately measure the amount of emulsified oil by visual inspection; moreover, the existing evaluation index Does not reflect emulsion aggregation stability

Method used

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  • Method for measuring and evaluating emulsifying property of surfactant
  • Method for measuring and evaluating emulsifying property of surfactant

Examples

Experimental program
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Embodiment 1

[0040] The mensuration and the evaluation of embodiment 1 surfactant emulsifying performance

[0041] Proceed as follows:

[0042] (1) Pour 5mL of simulated oil and 5mL of 0.4% surfactant solution to be tested (the main component is fatty alcohol polyoxyethylene ether sodium sulfate) into the sample cell respectively, and let it stand at the experimental temperature (70°C) for 0.5h , placed in a rotary incubator, rotated and mixed at a rate of 80rad / min for 1h, and fully mixed the simulated oil and the surfactant solution.

[0043] The simulated oil used in this example is dehydrated crude oil from Shengli Oilfield, with 6% saturated content, 72% aromatic content, 14% colloid and 8% asphaltenes.

[0044] (2) Use the multiple light scattering instrument to measure the change law of the backscattered light intensity with the measurement height and time at a scanning frequency of 1 time / 2min, and obtain the reference spectrum of the backscattered light and the reference spectrum...

Embodiment 2

[0054] Embodiment 2 Surfactant product emulsifying performance quality detection

[0055] Proceed as follows:

[0056] Sampling of the first batch of samples

[0057] (1) Pour 5mL of simulated oil and 5mL of 0.4% surfactant solution (alkyl alcohol polyoxyethylene ether carboxylate) into the sample cell respectively, and after standing for 0.5h at the experimental temperature of 70°C, place Rotate the incubator, rotate and mix at a rate of 80rad / min for 1h, and fully mix the simulated oil and surfactant solution.

[0058] (2) Use the multiple light scattering instrument to measure the change law of the backscattered light intensity with the measurement height and time at a scanning frequency of 1 time / 2min, and obtain the reference spectrum of the backscattered light and the reference spectrum of the transmitted light, as shown in Figure 4 shown.

[0059] (3) Determine the evaluation reference time point T according to the experimental needs and the rate of change of the em...

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Abstract

The invention discloses a method for measuring and evaluating the emulsifying property of a surfactant, which comprises the steps of (1) uniformly mixing simulated crude oil and a surfactant solution;(2) measuring a multi-light scattering spectrum; (3) determining an evaluation reference time point T0, the corresponding peak width L0 and the corresponding average light intensity [delta]BS0; (4) calculating the oil phase volume Vo1 and the emulsified oil rate [alpha]o; (5) calculating the peak area width L and the relative average light intensity [delta]BS; (6) determining the derivative relation shown in the description of the dimensionless peak width relative to the dimensionless time, and solving the mean shown in the description of derivatives at different time points; (7) determiningthe derivative of the dimensionless back scattering average light intensity relative to the dimensionless time, and solving the mean shown in the description of derivatives at different time points; and (8) calculating a comprehensive index [eta] to serves as an index for comprehensively evaluating the emulsifying property. The method of the invention comprehensively takes the emulsified oil amount, the emulsion aggregation ability and the coalescence ability into consideration, and has guiding significance for the measurement, evaluation and screening of the surfactant for chemical flooding in the oilfield.

Description

technical field [0001] The invention relates to a method for measuring and evaluating the emulsification performance of a surfactant, and relates to the field of chemical flooding to enhance oil recovery. Background technique [0002] Chemical flooding is an important method of enhancing oil recovery, which can achieve the goal of greatly improving oil recovery. Chemical flooding surfactant is an important part of chemical flooding system. In addition to effectively reducing the interfacial tension of oil and water, surfactants used in chemical flooding are also an important factor affecting the oil displacement effect. [0003] The traditional evaluation method of surfactant emulsification performance mainly uses the "water separation rate" parameter to carry out correlation analysis. This method mainly tests the stability of emulsion liquefaction. Although it can reflect the emulsifying properties of surfactants to a certain extent, there are still some problems: the eva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/49G01N21/59
CPCG01N21/49G01N21/59G01N2021/4709
Inventor 于群曹绪龙郭兰磊祝仰文王红艳石静潘斌林王丽娟刘煜郭淑凤
Owner CHINA PETROLEUM & CHEM CORP
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