Method for quantitatively characterizing contribution of flow field shearing to interface free energy of oil-water emulsification process
A technology of oil-water emulsification and quantitative characterization, which is applied in difficult areas and can solve problems such as unrealized quantitative characterization and inconvenient calculations
Active Publication Date: 2018-11-30
NORTHEAST GASOLINEEUM UNIV
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[0004] The purpose of the present invention is to provide a method for quantitatively characterizing the contribution of flow field shear to the interface free energy of the oil-water emulsification process, which is used to solve the problem of the oil-water emulsification behavior in the shear flow field of the oilfield gathering and transportation system and the force and deformation of the emulsified droplet. The problem of scale description, especially the problem of solving the relationship between the shear effect of the flow field, the free energy change of the oil-water interface, and the oil-water emulsification mechanism, which is inconvenient to calculate due to the directionality of the motion vector of the oil-water mixed medium, is currently limited to qualitative analysis and Problems of description without quantitative characterization
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[0069] Below in conjunction with accompanying drawing, the present invention will be further described:
[0070] like figure 1 As shown, in the shear flow field 1 with a velocity gradient perpendicular to the flow direction of the oil-water medium, the original spherical oil-water emulsion droplet is deformed by the shear action of the flow field, and the radius 2 of the spherical droplet is deformed into an ellipse spherical droplet 3, and induce an orientation angle 6, and at the same time due to the axisymmetric nature of the deformation, the major axis 4 of the ellipsoid and the minor axis 5 of the ellipsoid have the same and are proportional to the deformation value of the radius 2 of the spherical droplet deformation value.
[0071] like figure 2 As shown, for the deformed ellipsoidal droplet 3, the semi-ellipsoidal droplet 7 is affected by the oil-water interfacial tension, the droplet shape restoring force 8 opposite to the deformation direction, and the viscous she...
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The invention relates to a method for quantitatively characterizing contribution of flow field shearing to interface free energy of an oil-water emulsification process, and the method comprises: (1) deformation description of oil-water emulsified droplets under the flow field shearing; (2) establishment of the relationship between flow field shear stress and emulsified oil droplet-water interfacetension; (3) acquisition of deformation characteristic parameters of the oil-water emulsified droplets under the flow field shearing; (4) correlation between flow field shear energy and interface freeenergy change of the oil-water emulsification process; (5) quantitative characterization of the contribution of the flow field shearing to the interface free energy of the oil-water emulsification process; and (6) repetition of steps (2) to (5) to quantify flow field shear energy and interface free energy change of the oil-water emulsification process in an another physical oil-water medium, or another characteristic flow field to realize the quantitative characterization of the contribution of the flow field shearing of different properties to the interface free energy of different physicaloil-water emulsification processes. The method solves the problems of description of oil-water emulsification behaviors and deformation microscale and stress of the emulsified droplets in the shear flow field of an oil field gathering and transportation system.
Description
1. Technical field: [0001] The present invention relates to oil-water emulsification behavior and force and deformation description of emulsified droplets under the shearing action of flow field when oil-water mixed medium is collected and transported in oil field surface technology, especially for oil-water emulsification in shear flow field The technical problem of quantitative characterization of process interface free energy contribution is specifically related to the method of quantitative characterization of flow field shear contribution to interface free energy of oil-water emulsification process. 2. Background technology: [0002] In the process of oil field development, most of the crude oil is produced in the form of emulsion, which is generally a water-in-oil (W / O) system in which water droplets are dispersed in the oil phase, or an oil-in-water system in which oil droplets are dispersed in the water phase. (O / W) system, especially as the reservoir development ent...
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Login to view more IPC IPC(8): G01N13/00G01N13/02
CPCG01N13/00G01N13/02
Inventor 王志华刘扬钟会影周楠许云飞甘亦凡
Owner NORTHEAST GASOLINEEUM UNIV
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