Characterization method and device for secondary start-up displacement pressure of reservoirs at different temperatures

Abstract

The invention provides a characterization method and device for the displacement pressure of secondary start-up of an oil reservoir at different temperatures. The characterization method comprises thefollowing steps that crude oil is distilled according to the temperatures, and thus distilled oil products at different temperature intervals are obtained; based on the distilled oil products at thedifferent temperature intervals, surface tension of the oil products at the different temperature intervals is obtained according to a first predetermined rule; based on the distilled oil products atthe different temperature intervals, wetting angles of the oil products at the different temperature intervals are obtained according to a second predetermined rule; and according to the surface tension and the wetting angles of the oil products at the different temperature intervals, adhesion work of the oil products at the different temperature intervals is obtained according to a third predetermined rule, wherein the adhesion work of the oil products at the different temperature intervals is characterized to be the displacement pressure of secondary start-up of the oil reservoir at the different temperatures. According to the characterization method and device for the displacement pressure of secondary start-up of the oil reservoir at the different temperatures, it can be ensured that the crude oil in a cold area and a rich oil area can be better discharged to a production well, and balanced extension of a high-temperature oxidation area at the front edge of a fire line is ensured.

Description

technical field [0001] The application belongs to the technical field of petroleum exploitation, and in particular relates to a method and device for characterizing secondary start-up displacement pressures at different temperatures of oil reservoirs. Background technique [0002] Usually, during the ignition process of heavy oil reservoirs, the light components in the heavy oil are combusted to form heavy components, and the heavy components are difficult to displace when the fire flooding is started for the second time. The displacement pressure of secondary startup is very important for the ignition of heavy oil reservoirs. [0003] However, most of the current researches on inflamed oil reservoirs focus on the fire-line propulsion in the process of fire flooding. However, during the ignition process, the temperature field is preliminarily established, and the secondary start-up in the fire flooding process is different from the live-line propulsion in the fire-flooding ...

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Problems solved by technology

However, during the ignition process, the temperature field is preliminarily established, and the secondary start-up in the fire flooding process is different from the live-line propulsion in the fire-flooding process, so the fire-line propulsion method and parameters cannot be applied to the secondary start-up of heavy oil reservoirs

[0004] For this, the usual practice in the field of oil production can use the adhesion work of the reservoir to characterize the displacement pressure of the heavy oil reservoir, but it is difficult to directly test the adhesion work of the reservoir on site, and the workload is very huge

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