Device and method for measuring Sherwood number between gas and liquid in porous medium by applying CT (Computed Tomography)

Abstract

The invention relates to a device and a method for measuring a Sherwood number between a gas and a liquid in a porous medium by applying CT (Computed Tomography). The device comprises a CT scanning system and a gas-liquid mass transfer system. The method comprises the following steps: first, controlling the temperature and the pressure of a reaction container to be constant; acquiring CT images that the volume of foam in the porous medium changes with time at different liquid injection flow rates and in different liquid injection directions by utilizing a CT scanning imaging technology; obtaining the gas concentration value of the liquid and the value of a two-phase interface specific surface area after the CT images are processed, so that the Sherwood number of mass transfer between the gas and the liquid in the porous medium is calculated. By controlling an experimental device, different liquid injection directions can be set during an experiment process, so that convenience is brought to the analysis of the influence on a gas-liquid interface shape and the Sherwood number numerical value caused by gravity. By applying the method and a measuring device thereof, the Sherwood number between the gas and the liquid under a pore scale can be obtained, so that the cognition of mass transfer rules of the two phase materials of the gas and the liquid is enhanced; basic physical property data are provided for the analysis of multi-phase multi-component migration rules in a stratum environment.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation engineering, and relates to a method for measuring the Sherwood number between gas and liquid in a porous medium using CT and a measuring device thereof. Background technique [0002] Studying the phenomenon of mass transfer between gas and liquid (hereinafter referred to as mass transfer) is an important research factor for understanding the mutual dissolution process between gas and liquid. The mass transfer phenomenon is that the gas that has been dissolved in the liquid or the liquid that has been dissolved in the gas realizes the mass transfer to the unsaturated phase through molecular diffusion and convection. Taking the phenomenon of gas dissolved in water as an example, when groundwater flows, the interface between air bubbles and water becomes saturated due to the faster diffusion speed of gas molecules in the water and between the air-water interface. Furthermore, when co...

AI Technical Summary

Problems solved by technology

In addition, high-frequency ultrasonic waves must be used when measuring liquid phase saturation, otherwise it will cause great errors in the results and even lead to errors

In recent years, the newly developed light penetration method is widely used in the monitoring of fluid migration in indoor two-dimensional sand box experiments. The light intensity value of the entire gas infiltration process can be dynamically monitored by using a CCD camera. However, the spatial resolution is still at the millimeter level, and the use of more As a light source, LED lamps, which are more stable than incandescent lamps, cannot guarantee the stability of the incident light source for long-term use, and there are still certain limitations.

Images