Device and method for measuring three-phase permeability of supercritical CO2 emulsion by steady-state flow method

Abstract

The invention relates to a device for measuring the three-phase permeability of supercritical CO2 emulsion by a steady-state flow method. The device comprises a one-dimensional rock core model and a computed tomography (CT) scanner, wherein an inlet end of the one-dimensional rock core model is connected an emulsion generator and a crude oil injection device which are connected with each other in parallel; an inlet end of the emulsion generator is connected with a CO2 gas injection device and a surface active agent injection device which are connected with each other in parallel; an outlet end of the one-dimensional rock core model is connected with a gas source bottle and a liquid-containing narrow-mouth bottle which are connected with each other in parallel; a gas outlet pipe of the liquid-containing narrow-mouth bottle is sequentially connected with a drying pipe and a flow meter. According to the method for measuring the three-phase permeability of the supercritical CO2 emulsion, the three-phase fluid saturation of the supercritical CO2 emulsion is accurately obtained by a CT double-energy synchronous scanning method, and the relevant data measured by the experiment is substituted into a Darcy-Weisbach formula, so that the three-phase relative permeability of the supercritical CO2 emulsion under the different degrees of saturation can be obtained; the method is also used for measuring CO2 foam flooding two-phase permeability. The device and the method are small in limitation, are capable of reasonably approaching the experimental real value, and are simple in operation and accurate in measurement.

Description

technical field

[0001] The invention relates to a steady-state flow method for measuring supercritical CO 2 Apparatus and method for three-phase permeability of emulsion. Background technique

[0002] Due to CO 2 It is a gas with high solubility in both oil and water. When it dissolves in a large amount in crude oil, it can expand the volume of crude oil, decrease its viscosity, and reduce the interfacial tension between oil and water. Compared with other oil displacement technologies, carbon dioxide flooding has the advantages of wide application range, low cost of oil displacement, and significant improvement of oil recovery. This technology can not only meet the needs of oil field development, but also solve the problem of carbon dioxide sequestration and protect the atmospheric environment. Under reservoir conditions, CO 2 Generally in a supercritical state (temperature and pressure are above 31.1°C and 7.38MPa respectively), CO 2 The density is close to the liquid ...

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