Comparative Study of In-Situ Combustion Tests on Consolidated and Crushed Cores

IF 2.1 4区 工程技术 Q3 ENERGY & FUELS
A. G. Askarova, E. Popov, K. Maerle, A. Cheremisin
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引用次数: 2

Abstract

A significant amount of oil is contained in carbonate reservoirs, but only half of that oil can be produced by secondary enhanced oil recovery (EOR) methods. However, substantial improvements were made in EOR techniques and the prediction of carbonate reservoir performance within the last decades. Nevertheless, existing flow-simulation computer programs failed to provide a reliable prediction of such reservoirs due to their high heterogeneity and the reactivity of the rock. Potentially, in-situ combustion (ISC) is considered effective in developing heavy oils in carbonate reservoirs. The combustion reactions between crude oil and heterogeneous rock matrices introduce additional complexity to the simulation process. Also, most of the laboratory experiments studying the reaction kinetics of the ISC process are performed on the crushed core. However, to minimize the risks, improve the control of the process, and overcome upscaling issues, physical simulation must be carried out under conditions as close to the reservoir as possible. Consolidated core material in combustion tube (CT) experiments is desirable for better simulating some reservoir conditions with synthetic packs and for the cases when actual preserved reservoir core material may be available. Studying the relative effects of porosity and packing properties (specific surface area, sand grain distribution, and cementation) on the fuel is essential to evaluating the process under actual field conditions. This work presents a set of medium-pressure CT (MPCT) tests on crushed and consolidated cores and analyzes the differences, limitations, and performances of both approaches. Two MPCT tests were performed to evaluate the ISC feasibility on the heavy-oil carbonate reservoir with an initial oil saturation level of 0.38 to 0.50. According to previously published experimental results, such oil saturation levels can help avoid oil banking. Both experiments were conducted at reservoir conditions to consider the phase behavior at elevated pressures and temperatures. The method used in this research allows approbation of the methodology of ISC tests using consolidated core at high pressure, ensuring pack and process integrity during the experiment. The influence of consolidated core caused by significantly lower porosity and more uniform porous media elements than those made with unconsolidated material on combustion performance was assessed. Valuable data for different variations of combustion experiments were generated. This work compared two tests and presented the combustion parameters for a stabilized combustion period, such as fuel and air requirements, recovery efficiency, front velocity, and composition of produced gases. The research intends to demonstrate the potential application problems and address issues that might arise during ISC application on target reservoirs, including the higher air flux required for lower porosity of consolidated core samples. The experimental results performed under conditions closest to reservoir conditions are essential for further predictions and affect the ISC performance during pilot tests.
固结与破碎岩心原位燃烧试验对比研究
碳酸盐岩储层中含有大量的石油,但只有一半的石油可以通过二次提高采收率(EOR)方法开采。然而,在过去的几十年里,提高采收率技术和碳酸盐岩储层动态预测取得了实质性的进步。然而,由于此类储层的高非均质性和岩石的反应性,现有的流动模拟计算机程序无法提供可靠的预测。原位燃烧(ISC)被认为是开发碳酸盐岩油藏稠油的有效方法。原油与非均质岩石基质之间的燃烧反应增加了模拟过程的复杂性。此外,大多数研究ISC过程反应动力学的实验室实验都是在破碎的岩心上进行的。然而,为了最大限度地降低风险,改善过程控制,并克服升级问题,必须在尽可能接近油藏的条件下进行物理模拟。在燃烧管(CT)实验中,固结岩心材料对于用合成填料更好地模拟某些油藏条件以及在可能获得实际保存的油藏岩心材料的情况下是可取的。研究孔隙度和填料特性(比表面积、砂粒分布和胶结)对燃料的相对影响对于在实际现场条件下评估该过程至关重要。本文介绍了一套针对破碎岩心和固结岩心的中压CT (MPCT)测试,并分析了这两种方法的差异、局限性和性能。在稠油碳酸盐岩油藏初始含油饱和度为0.38 ~ 0.50的情况下,进行了两次MPCT测试,以评估ISC的可行性。根据先前发表的实验结果,这样的油饱和度水平可以帮助避免石油堆积。这两个实验都是在储层条件下进行的,以考虑在高压和高温下的相行为。本研究中使用的方法允许在高压下使用固结岩心进行ISC测试的方法,确保实验期间的包装和过程完整性。研究了孔隙率明显低于未固结材料且孔隙介质成分均匀的固结岩心对燃烧性能的影响。为不同的燃烧实验生成了有价值的数据。这项工作比较了两种测试,并给出了稳定燃烧期间的燃烧参数,如燃料和空气需求、回收效率、前速度和产出气体的组成。该研究旨在展示潜在的应用问题,并解决ISC在目标储层应用过程中可能出现的问题,包括固结岩心样品的低孔隙度需要更高的空气通量。在最接近油藏条件的条件下进行的实验结果对进一步预测至关重要,并影响中试期间ISC的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
5.30
自引率
0.00%
发文量
68
审稿时长
12 months
期刊介绍: Covers the application of a wide range of topics, including reservoir characterization, geology and geophysics, core analysis, well logging, well testing, reservoir management, enhanced oil recovery, fluid mechanics, performance prediction, reservoir simulation, digital energy, uncertainty/risk assessment, information management, resource and reserve evaluation, portfolio/asset management, project valuation, and petroleum economics.
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