层间干扰实质与再认识

doi:10.11885/j.issn.1674-5086.2022.04.12.03

摘要/Abstract

摘要： 受各储层段岩性、物性以及开采过程中各层段地层压力与流体物性差异等因素影响，多层油藏在采用合注合采开发时，始终存在层与层之间相互制约和干扰的问题。不恰当的注水开发模式会导致各层吸水能力、出油状况及水淹程度差异加剧，生产动态上表现出较大的层间矛盾，从而影响各层段和油藏整体的均衡动用及最终采收率。目前定义的多种层间干扰系数能定量表征层间干扰现象，但其物理内涵与实际注水开发渗流过程不符。针对前期层间干扰研究存在的不足，以海上某油田典型多层油藏X为例，结合室内实验方法、油藏工程方法和数值模拟方法，剖析了多层合采早期实验测试及理论研究中存在层间干扰的根源和实质，确定了分段测试与整体测试之间表现出的层间干扰实质是油藏压力场与渗流场的非均衡性所致，并基于层间干扰实质研究成果，建立了考虑层间干扰的油井产能计算新方法。实例应用结果表明，基于层间干扰实质的层间矛盾定量评价及油井产能计算新方法更符合油藏实际情况，为多层油藏合注合采产能的预测及降低层间干扰对实际生产效果影响的策略制定提供了理论依据。

关键词: 多层合采, 层间干扰与窜流, 数值模拟, 实验验证, 产能计算

Abstract: Due to the impact of lithology and physical properties of each layer, and the difference of formation pressure and fluid physical properties of each reservoir section in the process of production, there are always problems of mutual restriction and interference between layers in the process of commingled injection and production of multi-layer reservoir. Improper water injection development mode will lead to the difference of water absorption capacity, oil production status and water flooding degree of each layer, and show a big interlayer contradiction in production performance, thus affecting the balanced production and ultimate recovery of each layer and the whole reservoir. The interlayer interference coefficients, as defined so far, can quantitatively characterize the interlayer interference phenomena, but their physical connotation is inconsistent with the actual seepage process of water injection development. To solve the problems of early studies on interlayer interference, the research takes a typical multi-layer reservoir X of an offshore oil field as an example, using laboratory experiment method, reservoir engineering method and numerical simulation method, to analyze the root and essence of interlayer interference in early experimental testing and theoretical research of commingled production. The research results show that the interlayer interference in segmented test and overall test is caused by the disequilibrium of pressure field and seepage field of reservoir. Based on the research results, a new method of well productivity calculation, considering interlayer interference, is established. The application results show that the new methods of quantitative evaluation of interlayer contradiction and well productivity calculation, based on the essence of interlayer interference, are more consistent with the actual reservoir situation, and provide theoretical basis for predicting the productivity of commingled injection and production in multi-layer reservoirs and the formulation of strategies to reduce the impact of interlayer interference on actual production.

Key words: commingled production, interlayer interference and channeling flow, numerical simulation, experimental verification, productivity calculation

中图分类号:

TE341

唐海, 张铠漓, 唐瑞雪, 吕栋梁, 谭吕. 层间干扰实质与再认识[J]. 西南石油大学学报(自然科学版), 2022, 44(5): 113-124.

TANG Hai, ZHANG Kaili, TANG Ruixue, Lü Dongliang, TAN Lü. The Essence and Re-recognition of Interlayer Interference[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(5): 113-124.

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