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Experimental studies on reaction laws during the process of air injection into the oil reservoirs with low permeability
مطالعات تجربی در مورد قوانین واکنش در طی فرآیند تزریق هوا به مخازن روغن با نفوذپذیری کم-2020 The low permeability oil reservoirs are widely distributed in the world, but difficult to develop with the traditional
methods due to the low permeability and poor injection properties. Air injection technique not only has
the common characteristics of other gas injection techniques, but also can improve the quality of crude oil in situ
because of the oxidative ability of the injected air, with a unique advantage in developing low permeability
reservoirs. In order to study the reaction regularity between the hydrocarbon components in crude oil under
different conditions with the oxygen in the injected air, this experiment is designed for a low permeability
sandstone reservoir. In this experiment, one set of self-designed static low-temperature oxidation equipment
(including injection pump and high-temperature high–pressure reactor with sampling outlets) has been used.
Through analysis of the results of the chromatography for over 60 oil and gas samples, conclusions can be made
that after low temperature oxidation (LTO) reactions between the crude oil and the oxygen in the injected air, the
concentration of the heavy components in crude oil decreased, and the concentration of the light components
increased. By injecting oxygen-reduced air with 8% of oxygen, the concentration of the heavy components of
crude oil in the target reservoir reduced most obviously. The formation water and associated gas can hinder the
pyrolysis of heavy components, while the minerals in the formation can accelerate the pyrolysis process. The
relationship between the carbon atoms number in each of the most consumed hydrocarbon molecule and
different LTO reaction conditions has been proposed. According to the sensitivity analysis, it is believed that the
influence of the formation water on the LTO reactions is greater than that of minerals in the formation, and
influence of associated gas is less than that of minerals. Finally, combined the related physical and chemical
theories, a LTO chemical reaction equation has been put forward for the targeted low permeability oil reservoir.
The conclusions of the studies can provide some references for the indoor experiments and field applications of
air injection in the future. Keywords: Low permeability sandstone oil reservoir | Air injection | Static experiments | Low temperature oxidation | Formula |
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