Experimental system and method for evaluating heavy oil recovery by air foam assisted steam flooding

Abstract

The invention provides an experimental system and method for evaluating heavy oil recovery by air foam-assisted steam flooding. The experimental system includes: a core device, an injection device, and a production device; the core device includes: at least two connecting devices, at least two sand filling devices Among them, the sand-filling tubes are connected in parallel, the connecting equipment is connected with the sand-filling tubes, and the cores are placed in the sand-filling tubes respectively; the injection device includes: an air bottle, a liquid container, a foam generator, a steam generator, and an injection pipeline. ; Wherein, the air bottle is connected with the foam generator through the liquid container; the foam generator is connected with the connection equipment through the injection line; the steam generator is connected with the connection equipment through the injection line; the production device includes: sampling bag, wide-mouth bottle; sampling The bag and the jar are connected to the connecting device; the jar is used to receive the fluid produced by the coring device, and the sampling bag is used to receive the gas produced by the core device. The invention can well simulate the profile control effect of air foam assisted steam flooding.

Description

technical field [0001] The invention relates to the field of laboratory experiments for oil development, in particular to an experimental system and method for evaluating heavy oil assisted by air foam-assisted steam flooding. Background technique [0002] Adding air during steam injection in heavy oil reservoirs is an effective technology to improve the development effect of steam flooding. The relevant oil recovery mechanisms of air flooding can be roughly summarized into the following: increasing or maintaining reservoir pressure, flue gas flooding effect, thermal effect of oxidation reaction, CO 2 Swelling effect, acidification, gravity displacement. The above-mentioned action mechanisms can be summarized into two aspects: one is to maintain or increase the formation pressure by injecting air, and at the same time play the role of gravity drainage; the other is to indirectly realize smoke by means of the oxidation reaction of air and crude oil In the case of road gas f...

AI Technical Summary

Problems solved by technology

From this point of view, in the process of air foam assisted steam flooding, the reaction between air and crude oil is a dynamic process under high temperature conditions. The injected air will react with crude oil, and a certain amount of heat will be released through the oxidation reaction to maintain and increase the temperature of the reaction zone. , and then affect the composition of crude oil. If the usual short core with a length of 30cm and a diameter of 2.5cm is used to evaluate the profile control effect, it is easy to be displaced before the air and crude oil fully react. , the experiment cannot be carried out successfully to test the profile control effect of air foam flooding

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