轻质油藏注空气氧化及氧化动力学研究

发布时间：2018-01-10 13:22

  本文关键词：轻质油藏注空气氧化及氧化动力学研究　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 轻质原油 氧化机理 热动力学 热监测 自燃

【摘要】：近年,在油田高压注空气(HPAI)技术受到世界范围内广泛关注的同时,在油藏HPAI技术基础理论和应用研究上,依然存在着诸多空白与不足。在我国,油田HPAI项目实施相比于国外起步较晚,没有系统的基础理论研究,实践也处于探索阶段,有必要展开相关理论研究工作。 因此,为了在轻质油藏中成功实施空气驱项目,较好的控制轻质油藏原油在高压注空气过程中的氧化自燃,本文在实验室展开了对轻质原油氧化及氧化动力学的研究。本文首先对国内外轻质油藏高压注空气项目的实践情况和氧化自燃理论研究现状进行了综述,建立了实施空气驱项目的轻质油藏基础物性范围,分析了现阶段对轻质原油氧化自燃机理研究方面的薄弱环节,明确了本文的研究思路和研究方法,并综合对比筛选出了具有代表性的实验所用轻质油藏原油。 本次研究首先采用氧化管实验方法,对筛选出的轻质原油在多孔介质中的氧化机理进行了实验研究,分析了温度、压力、黏土含量和油样等多种影响因素对原油氧化行为的影响。通过对比原油氧化前后的油相、气相组分变化特征,深入解析了轻质原油的耗氧机理、氧化裂解历程和氧化前后原油的特性变化,重建了轻质原油耗氧反应和裂解反应模式,同时对轻质原油在不同油藏条件下的自燃潜力进行了分析研究。 随后,采用热重分析(TG)、微分热重分析(DTG)和差热分析(DTA)方法,对轻质原油采用不同注入气体,加入地层岩屑以及混入不同组分诸如饱和烷烃或胶质时,在不同温度区间的氧化动力学参数、吸热或放热程度以及质量损失情况等信息进行了类比分析,研究了它们对原油氧化特性的影响和作用,用以评价空气驱过程中轻质原油氧化自燃潜力。 在上述研究的基础上,通过实验室自主研发的热监测仪器,对轻质原油在不同条件下氧化过程中的温度变化进行了跟踪监测。在分析了油藏温度、原油组分、岩屑比面和黏土矿物对原油氧化升温的影响后,研究发现轻原油在不同条件下氧化后都会导致温度升高,升温范围是2-7℃。但是,在实验室条件下没有监测到因为升温导致的自燃的发生。 本文通过氧化管实验和综合热分析的方法对原油注空气过程中,影响原油氧化的多种影响因子进行了分析,应用了热监测仪器来分析轻质原油的氧化自燃的发生与否,在轻质原油氧化及氧化动力学研究方面取得了一定的研究进展。这些对今后的相关研究工作和现场实践应用均有一定的参考价值和指导意义。
[Abstract]:In recent years, oil field high-pressure air injection HPAI) technology has been widely concerned around the world, at the same time in the reservoir HPAI technology basic theory and application research. There are still many gaps and deficiencies. In our country, the implementation of HPAI project in oil field started relatively late compared with foreign countries, there is no systematic basic theory research, and practice is also in the exploration stage. It is necessary to carry out relevant theoretical research work. Therefore, in order to successfully implement the air flooding project in light reservoirs, the oxidation spontaneous combustion of crude oil in light reservoirs during high pressure air injection is better controlled. In this paper, the oxidation and oxidation kinetics of light crude oil have been studied in laboratory. Firstly, the practice of high-pressure air injection project and the theory of oxidation spontaneous combustion in light oil reservoirs at home and abroad have been reviewed in this paper. The basic physical property range of light oil reservoir for implementing air flooding project is established, the weak links in the study of oxidation spontaneous combustion mechanism of light crude oil at present are analyzed, and the research ideas and research methods of this paper are clarified. The representative light oil reservoir used in the experiment was screened by comprehensive comparison. In this study, the oxidation mechanism of light crude oil in porous media was studied by using oxidation tube method, and the temperature and pressure were analyzed. The effects of clay content and oil sample on the oxidation behavior of crude oil were studied. The oxygen consumption mechanism of light crude oil was analyzed by comparing the oil phase and gas phase change characteristics before and after oxidation. The oxidation cracking history and the characteristic changes of crude oil before and after oxidation have reconstructed the oxygen consumption reaction and pyrolysis reaction mode of light crude oil. At the same time the spontaneous combustion potential of light crude oil under different reservoir conditions has been analyzed and studied. Then, different injected gases were used for light crude oil by using TGG, differential thermogravimetric analysis (DTG) and differential thermal analysis (DTA). When adding formation cuttings and mixing different components such as saturated alkanes or colloids, the information of oxidation kinetics, endothermic or exothermic degree and mass loss in different temperature range are analyzed by analogy. Their effects on the oxidation characteristics of crude oil were studied to evaluate the oxidation spontaneous combustion potential of light crude oil during air flooding. On the basis of the above research, the temperature change of light crude oil during oxidation under different conditions was tracked and monitored by the thermal monitoring instrument developed independently in the laboratory, and the reservoir temperature and crude oil composition were analyzed. After the effects of cuttings ratio and clay minerals on the oxidation temperature of crude oil, it is found that the oxidation of light crude oil under different conditions will lead to a rise in temperature, with a temperature range of 2-7 鈩，

本文编号：1405427