Core Flooding Experiments on the Impact of CO2-EOR on the Petrophysical Properties and Oil Recovery Parameters of Reservoir Sandstones in Kazakhstan

Geosciences Pub Date : 2024-07-11 DOI:10.3390/geosciences14070185

A. Shabdirova, A. Kozhagulova, Yernazar Samenov, Rinat Merbayev, Ainur Niyazbayeva, Daryn Shabdirov

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Abstract

This study investigates the impact of CO2-enhanced oil recovery (CO2-EOR) on the petrophysical properties and oil recovery potential of sandstone reservoirs in the oilfields located in the east-southern Precaspian region of Kazakhstan. Despite the recognized potential of CO2-EOR for improving oil recovery and aiding carbon sequestration, there is limited understanding of how CO2-EOR specifically affects the petrophysical properties of sandstone reservoirs in this region. Laboratory experiments were conducted using two core samples from the selected oilfields to examine changes in porosity, permeability, and oil recovery coefficients. The results demonstrated that porosity changes ranged from a slight increase of 1.1% to a decrease of 1.5%, while permeability reduction was significant, with decreases ranging from 29% to 50% due to clay alteration and halite precipitation. The oil recovery coefficient after CO2 flooding was found to be between 0.49 and 0.54. These findings underscore the complex interactions between CO2 and reservoir rocks, emphasizing the need for tailored EOR strategies in different geological settings.

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哈萨克斯坦二氧化碳-EOR 对储层砂岩岩石物理特性和采油参数影响的岩心充水实验

本研究调查了二氧化碳提高石油采收率（CO2-EOR）对哈萨克斯坦前里海东部-南部地区油田砂岩储层岩石物理特性和石油采收潜力的影响。尽管 CO2-EOR 在提高石油采收率和帮助碳封存方面的潜力已得到公认，但人们对 CO2-EOR 如何具体影响该地区砂岩储层岩石物理特性的了解还很有限。我们使用来自选定油田的两个岩心样本进行了实验室实验，以研究孔隙度、渗透率和采油系数的变化。结果表明，孔隙度的变化范围从略微增加 1.1% 到减少 1.5%不等，而渗透率则由于粘土蚀变和海绿石沉淀而显著下降，降幅从 29% 到 50%不等。二氧化碳充注后的采油系数介于 0.49 和 0.54 之间。这些发现凸显了二氧化碳与储层岩石之间复杂的相互作用，强调了在不同地质环境下采取有针对性的 EOR 策略的必要性。

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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Geosciences

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