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A kind of determination and evaluation method of surfactant emulsifying performance

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

Active Publication Date: 2021-06-01
CHINA PETROLEUM & CHEM CORP +1
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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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  • A kind of determination and evaluation method of surfactant emulsifying performance
  • A kind of determination and evaluation method of surfactant emulsifying performance
  • A kind of determination and evaluation method of surfactant emulsifying performance

Examples

Experimental program
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Effect test

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 emulsification performance of a surfactant: (1) mixing simulated crude oil and a surfactant solution; (2) measuring multiple light scattering spectra; (3) determining the evaluation reference time point T 0 , corresponding to the peak width L 0 And the corresponding average light intensity △BS 0 ; (4) Calculate the oil phase volume V o1 and emulsified oil rate α o ; (5) Calculate the peak area width L, and its relative average light intensity △BS; (6) Determine the dimensionless peak width about the dimensionless time derivative relationship to obtain the mean value of the derivative at different time points (7) Determine the dimensionless The derivative of the backscattered average light intensity with respect to the dimensionless time is obtained, and the mean value of the derivative at different time points (8) is calculated to obtain the comprehensive index η, which is used as an index for comprehensive evaluation of the emulsification performance. The method of the invention comprehensively considers the amount of emulsified oil, the aggregation ability of the emulsion, and the aggregation ability, and has guiding significance for the measurement, evaluation and screening of surfactants used in oil field chemical flooding.

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 Patents(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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