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油田长期停产下的油水运聚平衡解析模型及剩余油分布
断块油气田
2021年 28卷 第2期
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Title
Analytical model of oil-water migration & accumulation rebalance and remaining oil distribution of long-term shutdown oilfield
单位
中海石油（中国）有限公司深圳分公司，广东 深圳 518000
Organization
Shenzhen Branch of CNOOC Ltd., Shenzhen 518000, China
摘要
油田长时间停产伴随着油水重新分异，文中建立了一种油水运聚平衡解析模型，能快速指导该类油藏开展定量、半定量剩余油分布研究。以“势控论”为基础，从油水运移动力学关系出发，开展了底水油藏临界运移油柱高度和油水运聚平衡时间的推导，并利用机理数值模拟验证了模型的可靠性。研究表明：储层渗透率、运移距离、运聚角度是影响停产后运聚平衡时间的主要因素，海相低幅高渗底水油藏关停后动油水界面重新平衡需上百年。该模型指导陆丰A油田进行评价井点位置设计，预测剩余油柱高度与实钻结果较为吻合，验证了停产11 a后动油水界面仍处于未平衡状态，对老油田二次开发潜力及风险认识具有重要指导意义。
Abstract
The long-term shutdown oilfield accompanies oil and water re-differentiation. This paper establishes an analytical model for oil-water migration & accumulation rebalance, which can quickly guide this kind of reservoir with quantitative and semi-quantitative understanding of remaining oil distribution. Based on "Potential Control Theory", starting from the relationship between oil and water transport mechanics, the critical migration oil column height and oil-water rebalance time of bottom-water reservoir is derived, and mechanism numerical simulation verifies the reliability. Research shows that permeability, migration distance and inclination are the main factors that affect the oil-water rebalance time, and the model quickly assesses the marine low-amplitude and high-permeability bottom water reservoirs oil-water rebalance should take a century time. This model has guided the design of evaluation well location in Lufeng A oilfield, the prediction residual oil column height is in good agreement with the actual drilling result, which verified the dynamic oil-water interface still unbalanced after 11 years of shutdown, and it has important guide for the understanding of the potential and risk of secondary development of old oil fields.
关键词：
底水油藏;
临界油柱高度;
运聚平衡时间;
剩余油;
Keywords:
bottom-water reservoir;
critical oil column height;
migration &
accumulation rebalance time;
remaining oil;
DOI
10.6056/dkyqt202102019
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