Method for determining migration velocity of displacement front in CO2 miscible displacement physical simulation

Abstract

The invention discloses a method for determining the migration velocity of a displacement front in CO2 miscible displacement physical simulation, belonging to the detection field of oil pool physical simulation. The method for determining the migration velocity of a displacement front in CO2 miscible displacement physical simulation comprises the following steps of: firstly, determining the oil saturation distribution in different positions in a porous medium by use of the imaging technology; obtaining the oil saturate change curve in a sand filling model in the imaging view field; then, determining the characteristic moment point passing through the imaging view field of the displacement front; and finally, obtaining the migration velocity of the displacement front by use of an analysis method. The method can determine the migration velocity of the displacement front in the CO2 miscible displacement process and accurately obtain the flowing law of CO2 in the oil-containing porous medium so as to provide analysis basis for the nondestructive detection in the CO2 miscible displacement physical simulation process.

Description

technical field [0001] The present invention relates to a method for determining CO 2 A method for displacement front migration velocity in miscible flooding physical simulation belongs to the field of reservoir physical simulation detection. Background technique [0002] will CO 2 Injection into oil reservoirs can not only enhance oil recovery and generate huge economic benefits, but also achieve CO 2 Geological storage to solve CO 2 Therefore, this method should be an effective way to solve the conflicting problems of human development and environmental improvement. by CO 2 Flooding technology can further increase oil recovery by 10%-15% on the basis of conventional technology, so further in-depth research on the use of CO 2 Issues related to enhanced oil recovery technology are necessary. However, with conventional experimental methods, the actual formation model can only be regarded as a "black box", and the oil displacement status can only be analyzed by monitorin...

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Problems solved by technology

However, with conventional experimental methods, the actual formation model can only be regarded as a "black box", and the oil displacement status can only be analyzed by monitoring the flow rate and pressure of injection and production. This experimental method cannot accurately grasp the fluid flow in porous media. Occurrence state and migration process, obviously there are certain limitations

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