Device and method for determining change law of oil-water interfacial tension in CO2 oil displacement process

Abstract

The invention provides a device and method for determining the change law of oil-water interfacial tension in a CO2 oil displacement process, belonging to the field of test methods used in oil and gas field development. The method comprises the steps of: firstly determining the oil-water interfacial tension under different pressures in the water flooding process; then with an oil deposit condition being unchanged, converting to CO2 flooding, then determining the oil-water interfacial tension under different pressures in the CO2 flooding process, and finally comparing the two determined oil-water interfacial tensions, thus obtaining the change law of the oil-water interfacial tension in the CO2 injection process. By using the method, the changing process of the oil-water interfacial tension in the CO2 injection process can be simulated under the oil deposit condition, and further the change law of the oil-water interfacial tension in the CO2 injection process is concluded, and data and theoretical support are supplied for the CO2 oil displacement process of an oil deposit; and according to the method, the process from water flooding to CO2 flooding is continuous, the oil deposit condition is unchanged, and the implementation situation of a real oil field can be better simulated.

Description

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AI Technical Summary

Benefits of technology

This patented technology allows for simulation of carbon dioxide (CO2) injected into an oil well when there are different types of fluids at varying levels within it's own pores or through other means such as piping systems. By measuring this changes over time, researchers have been able to predict how much gas will be taken up by each type of fluid being injected. These results help optimize production strategies based upon these factors like water saturation level and pressure drop across multiple layers inside the borehole system.

Problems solved by technology

This patents describes various techniques related to studying changes made over time when injecting fluids containing carbon dioxide or hydrogen sulphur hexadecaytonic acid (HS) onto an interface called C02Fast Borehole Flood Layer Method (CBFLM). These measurements involve comparing the behavior of these liquids against each other's surface tensional stress state. However, current methods have limitations such as lack accuracy, complexity, and potential errors associated with previous approaches like those mentioned above.

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