强水驱油藏渗透率动态变化规律定量预测方法

doi:10.11885/j.issn.1674-5086.2017.10.09.01

摘要/Abstract

摘要： 南海西部海相砂岩油田大多已进入中高含水阶段，长期冲刷作用造成储层渗透率不断发生变化。针对岩芯驱替实验难以定量表征和预测水驱油藏开发过程中储层渗透率的动态变化问题，开展了水驱过程中储层渗透率动态变化规律研究。研究中优选面通量为表征油藏冲刷强度指标，通过对渗透率时变机理的分析，结合油藏开发过程中各生产井试井解释渗透率变化情况，推导出渗透率随面通量动态变化对数预测公式，进一步对关系式进行推广应用，扩大了对数关系式的适用性。最后，设计高倍驱替实验，验证渗透率和面通量对数关系的准确性和科学性，该对数关系式在南海西部高含水油田中后期调整挖潜研究中应用效果较好。

关键词: 海相砂岩油田, 面通量, 冲刷强度, 渗透率时变, 高倍驱替实验

Abstract: Most of the marine sandstone oil fields in the western part of the South China Sea have entered the middle-and high-water cut stage. The permeability of these reservoir changes constantly under the long term scouring effect. Because it is difficult to quantitatively characterize and predict the dynamic variation in permeability of oil reservoirs during the extraction process by core displacement experiments, we analyzed the dynamic variation pattern of reservoir permeability during a waterflooding process. In this study, the flux at the preferred surface is used as an index to characterize the reservoir scouring strength. By analyzing the mechanism associated with the change in permeability and adapting it to rationalize the temporal variation in permeability of production and testing wells during the oil reservoir extraction process, we derived a logarithmic prediction formula that describes the change in permeability with varying surface flux. We further applied the equation in a wider range of applications and expanded the applicability of the logarithmic correlation. Finally, a high-ratio oil displacement experiment is designed and performed to validate the accuracy and scientific merits of the proposed logarithmic relationship between permeability and surface flux. This logarithmic relationship was found to work well in practical applications during the later stages of oil extraction in oil fields with high water content in the western part of the South China Sea.

Key words: marine sandstone oil fields, surface flux, scouring strength, temporal variation of permeability, high-ratio oil displacement experiment

中图分类号:

TE311

洪楚侨, 王雯娟, 鲁瑞彬, 钟家峻, 任超群. 强水驱油藏渗透率动态变化规律定量预测方法[J]. 西南石油大学学报(自然科学版), 2018, 40(5): 113-121.

HONG Chuqiao, WANG Wenjuan, LU Ruibin, ZHONG Jiajun, REN Chaoqun. A Quantitative Method to Predict the Dynamic Variation in Permeability of Oil Reservoirs During Waterflooding and Oil Displacement[J]. 西南石油大学学报(自然科学版), 2018, 40(5): 113-121.

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http://journal15.magtechjournal.com/Jwk_xnzk/CN/Y2018/V40/I5/113

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