Effect of Interactions between Saturates-Aromatics-Resins-Asphaltenes Components on the Oxidation Behavior and Kinetics
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ect of Interactions between Saturates-Aromatics-ResinsAsphaltenes Components on the Oxidation Behavior and Kinetics of Heavy Crude Oil Shuai Zhaoa, b, *, Wanfen Pua, b, Jing Huoc, Jingjun Panc, and M. A. Varfolomeevb aState
Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500 China b Department of Petroleum Engineering, Kazan Federal University, Kazan, 420008 Russia cResearch Institute of Technology, Petrochina Xinjiang Oilfield Company, Xinjiang, 834000 China *e-mail: [email protected] Received February 11, 2020; revised March 20, 2020; accepted July 10, 2020
Abstract—In this paper, the particular attention was placed on the effect of interactions between saturates (S), aromatics (A), resins (R), and asphaltenes (A) on the oxidation behavior and kinetics of heavy crude oil. The results disclosed that the close interactions between SARA were observed during low-temperature oxidation (LTO). However, these interactions generated minor influence on heat release of LTO of the oil, which made it accessible to predict the thermal release caused by LTO from individual SARA components. The interactions between SARA components were much stronger at the high-temperature oxidation (HTO) region relative to LTO region, and noticeably intensified heat release of the oil. According to the results of kinetics, it was believed that the interactions between SARA components exerted minor influence on the reactivity of the oil during LTO, but obviously improved the reactivity of the oil during HTO. Keywords: interactions, SARA components, oxidation behavior, kinetics, heavy crude oil DOI: 10.1134/S0965544120110183
INTRODUCTION The exploitation of heavy oil reserves has been paid much attention in recent years due to a dramatically declining trend of production of light oil reservoirs. Of the widely accepted enhanced oil recovery (EOR) techniques, in-situ combustion (ISC) has been demonstrated to be a very promising oil recovery process, which is reported to be about 2 to 4 times higher energy-efficient compared to the traditional steam driving [1]. To date, however, a large proportion of ISC projects failed, largely as a consequence of a limited knowledge of oxidation reactions and kinetics of crude oils [2, 3]. Basically, crude oils are separated into four main fractions, that is, saturates, aromatics, resins and asphaltenes (SARA) [4, 5]. It is reported that the interactions between SARA components yielded a significant impact on the oxidation reactions of crude oils [5–7]. For instance, Liu et al. [6] observed that the low-temperature oxidation (LTO) temperature increased and the two mass loss stages of resins in high-temperature oxidation (HTO) changed into one when saturates was mixed with resins. Besides, Zhao et al. [7] concluded that the obvious inhibiting effect existed between SARA components in the LTO
regime, whereas Yuan et al. [8] reported that the LTO reaction pathways of individual fractions were independent of each other in the LTO region. The aforementioned
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