Kinetics of Low-Temperature Oxidation of Light Crude Oil

Abstract

The in situ combustion (ISC) process has drawn a lot of attention in the field of heavy oils. However, in the case of a light crude oil reservoir, in which low-temperature oxidation (LTO) is dominant, it is still less well-understood, especially for its reaction mechanism. In this paper, ramped temperature oxidation (RTO) experiments with different temperature intervals are used to investigate the oxidation reaction behaviors on various distillation pseudo-components from Dagang light crude oil. Both RTO and isothermal experiments are conducted on the whole crude oil and the sand mixture to obtain the LTO kinetic behaviors. The results indicate that oxygen addition reaction of the crude oil occurs to a great extent in the low-temperature region of 120−200 °C. Because the LTO reaction incorporates an oxygen atom into petroleum molecules rather than forming high-temperature oxidation (HTO) products (i.e., CO 2 , CO, and H 2 O), CO 2 production is minor during the LTO process. The acid number of the crude oil increases with an increasing reaction time and temperature during the LTO as a result of the formation of organic acids. Two pseudo-component distillates were subjected to major oxygen additions as evidenced by oxygen uptake and increases of the acid numbers of oxidation products. The apparent activation energy (E a ) of the crude oil that derived from the results of RTO tests (at different temperature ranges) accompanied by the isoconversional method present the E a values varying from 160 to 350 kJ/mol as the temperature changes from 205 to 230 °C. The E a value obtained through the isothermal experiment shows a decreasing trend from 200 to 33 kJ/mol as the temperature increases from 148 to 235 °C.

Passivity of 13Cr Stainless Steel in 1% NaCl Solution under Dynamic Supercritical CO2 Conditions

“…1,2 Compared with injection technology using other gases (N 2 , CO 2 ), air injection is becoming the development trend for enhanced oil recovery (EOR) because of its unique advantages, i.e., abundance and low cost. 3,4 Air-injection EOR is a cost-effective technology for oil exploitation. However, upon injection of air into the oilfield, oxidation of crude oil produces carbon dioxide and leads to an environment with the coexistence of CO 2 and O 2 , which causes a serious problem of steel pipe corrosion.…”

Exothermal Property and Kinetics Analysis of Oxidized Coke and Pyrolyzed Coke from Fengcheng Extra-Heavy Oil

“…Therefore, the Friedman and Ozawa–Flynn–Wall (OFW) methods were chosen in this research. − The main advantages of these isoconversional kinetics models are as follows. (1) Compared with the Arrhenius model, they allow for evaluating the kinetic parameters without ascertaining the reaction model to avoid the compensation effect. , (2) These isoconversional models contribute to revealing the complex thermal degradation process and recognizing the corresponding reaction mechanisms because of the dependence of kinetic parameters on the conversion degree. , …”

Feasibility study on further enhanced oil recovery by ISC of remaining oil after polymer flooding

“…[9][10][11][12] If the ISC is introduced into a light oil reservoir and oxygen is rapidly consumed using a high-temperature combustion front, it can solve the problem of oxygen safety in the light oil injection air on the one hand, and improve the crude oil recovery factor on the other hand. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Therefore, the ISC technology can be used as a polymer-ooding technology replacement method to further improve oil recovery. However, studies on whether the ISC technology is suitable for thin oil reservoirs aer polymer ooding are limited.…”