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用于提高坎贝盆地X油田砂岩油藏采收率的连续水交替注入二氧化碳气体实验分析

Experimental analysis of sequential water alternating CO₂ gas injection for enhancing oil recovery in X-field sandstone reservoir of Cambay basin.

作者信息

Rawat Ashutosh, Khanikar Bhaskarjyoti, Samanta Abhishek Kumar, Nguessan Patrick, Mehta Bhavesh, Sircar Anirbid, Desai Bhawanisingh, Bera Achinta, Bist Namrata

机构信息

Oil and Natural Gas Corporation Limited, Mumbai, 400051, India.

Department of Petroleum Engineering, School of Energy Technology, Pandit Deendayal Energy University, Gandhinagar, 382426, India.

出版信息

Sci Rep. 2025 Jul 1;15(1):21238. doi: 10.1038/s41598-025-01746-0.

DOI:10.1038/s41598-025-01746-0
PMID:40594017
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12215586/
Abstract

This study evaluates the oil recovery potential of sandstone reservoirs through sequential water-alternating CO₂ gas injection. Experimental work focuses on optimizing injection patterns, including alternating CO₂ and water cycles, to assess their impact on enhanced oil recovery (EOR). Analytical methods performed before detailed analyses include Fourier Transform Infrared (FTIR) Spectroscopy and X-ray diffraction (XRD) on the crude oil and core samples from the same field of Cambay Basin. FTIR analysis revealed a dominance of long-chain aliphatic hydrocarbons, suggesting favorable interactions with CO₂ for viscosity reduction and oil swelling. XRD revealed quartz-dominant cores with subordinate feldspar that control fluid permeability and chemical interactiveness. Sequential Water-Alternating-Gas (WAG) injection improved sweep efficiency by minimizing gas channeling and maximizing CO₂-oil contact. Soak periods conducted during injection enhance some miscibility effects with addition of extra oil mobility. High permeability cores experienced early gas breakthroughs, while low permeability delayed gas movement, achieving better recovery. Reservoir heterogeneities and water-shielding effects were critical challenges, underscoring the role of petrophysical properties in recovery performance. The results demonstrate that CO₂ WAG injection in sandstone reservoirs significantly enhances crude oil recovery by improving oil displacement efficiency. The presented work emphasizes the parameters porosity, permeability, and oil saturation as prerequisites for the process. Collected sandstone core samples show that variations in these properties influence the effectiveness of CO₂ WAG injection showing the resultant oil recovery increase by 20-25% after secondary brine injection. The integration of advanced characterization and strategic injection patterns establishes a foundation for optimizing CO EOR in mature fields.

摘要

本研究通过连续注水交替注入二氧化碳气体来评估砂岩油藏的原油采收潜力。实验工作重点在于优化注入方式，包括二氧化碳与水的交替循环，以评估其对提高采收率（EOR）的影响。在进行详细分析之前所采用的分析方法包括对来自坎贝盆地同一油田的原油和岩心样品进行傅里叶变换红外（FTIR）光谱分析和X射线衍射（XRD）分析。FTIR分析表明长链脂肪烃占主导地位，这表明其与二氧化碳在降低粘度和使原油膨胀方面存在有利的相互作用。XRD显示岩心以石英为主，长石为辅，它们控制着流体渗透率和化学相互作用。连续注水交替注气（WAG）通过减少气窜并最大化二氧化碳与原油的接触来提高波及效率。注入过程中的浸泡期通过增加额外的原油流动性增强了一些混相效果。高渗透率岩心出现早期气窜，而低渗透率岩心则延迟了气体运移，实现了更好的采收效果。油藏非均质性和水屏蔽效应是关键挑战，突出了岩石物理性质在采收性能中的作用。结果表明，砂岩油藏中注入二氧化碳WAG通过提高驱油效率显著提高了原油采收率。所呈现的工作强调了孔隙度、渗透率和含油饱和度等参数是该过程的先决条件。采集的砂岩岩心样品表明，这些性质的变化会影响二氧化碳WAG注入的效果，二次盐水注入后原油采收率提高了20 - 25%。先进表征与战略注入方式的结合为成熟油田优化二氧化碳提高采收率奠定了基础。

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