Feasibility of spontaneous combustion in ultra-deep high-pressure shale oil reservoirs during air injection

IF 3.1 2区 化学 Q2 CHEMISTRY, ANALYTICAL
Shuai Zhao , Chunyun Xu , Wanfen Pu , Chengdong Yuan , Mikhail A. Varfolomeev , Vladislav Sudakov
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引用次数: 0

Abstract

There is a lack of research on the spontaneous combustion phenomenon and its main influencing factors in ultra-deep high-pressure shale oil reservoirs with additional fracturing. In this study, we examine the exothermic characteristics of shale oil oxidation using high-pressure differential scanning calorimetry (HP-DSC) and accelerating rate calorimetry (ARC). Subsequently, a reaction kinetics model is built by integrating the HP-DSC and ARC data. Furthermore, the main factors affecting spontaneous combustion are identified by combining the simulation results with range and variance analyses. The HP-DSC and ARC results indicate a positive potential for achieving spontaneous combustion in shale oil. The developed reaction kinetics model successfully captures the exothermic characteristics of shale oil oxidation. The simulation results demonstrate that spontaneous combustion occurs approximately 5 m away from the injection well, with a delay time of 10.74 days. The critical factors determining the occurrence of spontaneous combustion are O2 concentration and oil saturation.

超深层高压页岩油藏在注入空气过程中自燃的可行性
目前缺乏对额外压裂超深高压页岩油藏自燃现象及其主要影响因素的研究。在本研究中,我们使用高压差示扫描量热法(HP-DSC)和加速速率量热法(ARC)研究了页岩油氧化的放热特征。随后,通过整合 HP-DSC 和 ARC 数据,建立了反应动力学模型。此外,通过将模拟结果与范围和方差分析相结合,确定了影响自燃的主要因素。HP-DSC 和 ARC 结果表明页岩油具有实现自燃的积极潜力。所开发的反应动力学模型成功地捕捉到了页岩油氧化的放热特征。模拟结果表明,自燃发生在距离注入井约 5 米的地方,延迟时间为 10.74 天。决定自燃发生的关键因素是氧气浓度和石油饱和度。
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来源期刊
Thermochimica Acta
Thermochimica Acta 化学-分析化学
CiteScore
6.50
自引率
8.60%
发文量
210
审稿时长
40 days
期刊介绍: Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes
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