Visualized rheological method for evaluating emulsion stability
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A technique for emulsion and stability, applied in the field of emulsion evaluation
Active Publication Date: 2017-10-20
CHINA PETROLEUM & CHEM CORP +1
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[0004] The purpose of the present invention is to provide a solution to the problem of quantitative analysis of the stability of oil-water emulsions, using a CCD in-situ camera system to visually study the
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Embodiment 1
[0022] Example 1: Partially hydrolyzed polyacrylamide polymer 1# is produced by Shengli Oilfield Baomo Chemical Co., Ltd., with a molecular weight of 22 million; crude oil and simulated formation water are provided by Shengli Oilfield, emulsifier (Changzhou Guohua Electric Co., Ltd.); Rheometer (MCR 301 Rheometer, Anton Paar, Austria).
[0023] The first step is to prepare an oil-water emulsion dispersion system with an oil-water ratio of 1:3 to make it fully emulsified. In a beaker, add 3 parts of simulated formation water (the polymer concentration is 1500mg / L), and then add a part of crude oil, put the mixed solution on the workbench of the emulsifier, turn on the switch of the emulsifier, and start emulsification to obtain a relative stable emulsion.
[0024] In the second step, a visual rheological experiment of emulsion stability was performed. Measurements were made using an MCR 301 rheometer from Anton Paar, Austria. The experimental operation is as follows: In the ...
Embodiment 2
[0026] Embodiment 2: Hydrophobic association polymer 2# is produced by Shengli Oilfield Baomo Chemical Co., Ltd., molecular weight is 20 million; Crude oil and simulated formation water are provided by Shengli Oilfield, emulsifier (Changzhou Guohua Electric Co., Ltd.); rheometer (MCR 301 rheometer, Anton Paar, Austria).
[0027] Step 1 and 2 are identical with embodiment 1;
[0028] The third step is to process the experimental data and evaluate the stability and viscoelasticity of the emulsion. First observe the changes of the emulsion oil droplets during the experiment, whether the particle size of the oil droplets before and after high-speed shearing is uniform, whether the coalescence and demulsification of the oil droplets are obvious, and whether there is an oil film phenomenon. Such as image 3 and 4As shown, compared with Example 1, in the shock stage, the oil droplets are evenly distributed and the particle size is small. At this time, the storage modulus and loss ...
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Abstract
The invention provides a visualized rheological method for evaluating emulsion stability. The visualized rheological method for evaluating emulsion stability comprises the following steps: step 1, preparing an oil-water emulsion disperse system and emulsifying the system sufficiently; step 2, setting a three-segment rheological test including an oscillation mode in a first segment, a high-speed shear mode in a second segment and an oscillation mode in a third segment for the visualized rheological test on the emulsion stability; step 3, processing experimental data and evaluating the emulsion stability and viscoelasticity. The visualized rheological method for evaluating the emulsion stability has the advantages that viscoelasticity change of an oil-water interface can be researched in a dynamic visualized manner, and adsorption and coalescence phenomena of oil drops or water drops in an aqueous phase or an oil phase are researched directly, so that the emulsion stability is researched on the basis of comparison.
Description
technical field [0001] The invention relates to the technical field of emulsion evaluation, in particular to a visual rheological method for evaluating emulsion stability. Background technique [0002] During the flooding process of crude oil formation, crude oil and displacement fluid are subjected to a large amount of shear, forming crude oil emulsion. When the displacement fluid contains high molecular weight polymers, such as partially hydrolyzed polyacrylamide or hydrophobically associated polymers, the formed emulsion has higher stability. This is conducive to the displacement of crude oil from the formation, so the quality of the emulsification is an important measure of the oil displacement system. [0003] There are many evaluation methods of emulsion stability in the prior art, such as: Applied Chemical Industry Journal, Issue 07, 2012, Effect of polymer on the stability of crude oil emulsion, introduces the macroscopic dehydration rate obtained by bottle test met...
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