The Experiment Study of Using Gas Tracer on Analysis the Mechanism of
CO2 Flooding

doi:10.11885/j.issn.1674-5086.2012.12.24.03

Abstract

Abstract:

In order to describe the characters of the miscible and immiscible CO2 flooding，the SF6 is chosen as the gas tracer.
According to the principle of tracer response，several parameters like PV，peak value of curve，the width of curve，the recovery
rate of tracer and the forecasting of curve were taken into the description of the character of the miscible and immiscible CO2
flooding. The result in this paper illustrated that the curves of the tracer are different between miscible and immiscible driving.
The tracer curve of miscible driving shows narrower the hump is，the lower recovery of the tracer，the smaller the forecasting
coefficient. On the contrary，in immiscible CO2 flooding，oil and gas will be separated and the recovery rate of oil will decrease
sharply. So，the flooding states can be detected by monitoring the gas tracer during CO2 flooding and the findings will improve
the recovery rate of oil.

Key words: CO2, SF6, miscible and immiscible flooding, gas tracer, response curve

Guo Wenmin1，2*, Li Zhiping1, L¨u Aihua2, Wan Guofu2. The Experiment Study of Using Gas Tracer on Analysis the Mechanism of
CO2 Flooding[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2012.12.24.03.

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