致密油藏动态渗吸排驱规律与机理
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王秀宇(1976—),女,辽宁庄河人,副教授,博士,从事油层物理学和提高采收率研究。联系电话:13811270754,E-mail:wangxiuyu@cup.edu.cn。

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国家“973”计划“提高致密油储层采收率机理与方法研究”(2015CB250904),国家自然科学基金项目“致密油储层基质渗吸规律及原油动用机理研究”(51574257)。


Dynamic imbibition principles and mechanism of tight oil reservoirs
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    摘要:

    高效开发致密油藏是石油领域的一项重要任务,而渗吸采油作为开发致密油藏的重要机理之一,越来越受到人们的重视。选取新疆油田致密砂岩天然岩心和人造岩心,在室内条件下,利用改进的动态渗吸实验装置,系统地研究基质渗透率、温度、压力、岩心尺寸和裂缝密度等因素对动态渗吸采出程度的影响。通过将实验参数进行无因次化,得到无因次渗吸采出程度归一化模型。利用该模型得到的采出程度大于目前广泛应用的Ma模型计算结果,与动态渗吸实验得到的规律相吻合。研究结果表明:当岩心渗透率处于同一级别时,动态渗吸采出程度既有可能与岩心渗透率呈正相关,也有可能呈负相关;在其他条件相同的前提下,温度越高,岩心长度越短,动态渗吸效果越好;压力对渗吸效果的影响存在一个最佳范围,在本实验条件下为5~7 MPa;动态渗吸采出程度的增幅与裂缝密度 呈线性正相关。

    Abstract:

    Efficient development of tight oil reservoirs is an important task in the petroleum field. Spontaneous imbibition is an important mechanism for tight oil development,which is receiving increasing attention. Natural cores and artificial cores of the tight sandstone reservoirs in Xinjiang Oilfield were selected. Experiments with improved dynamic imbibition device were carried out to study the influence of permeability,temperature,pressure,core length and fracture density on the dynamic imbibition recovery. In addition,a new dimensionless normalized model of the imbibition recovery was proposed through normalization on the experimental parameters. The new model has a better fitting to the dynamic experimental data than the widely used Ma model. The results show that core permeability has a positive or negative correlation with the dynamic imbibition recovery within a certain permeability level;a higher temperature and a shorter core corresponds to a higher imbibition recovery under the same other conditions;higher fluid pressure is more favorable to the dynamic imbibition at the optimal pressure range of 5-7 MPa in the experimental study;increment of the imbibition recovery is linearly related to the fracture density.

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王秀宇,巨明霜,杨文胜,隋微波.致密油藏动态渗吸排驱规律与机理[J].油气地质与采收率,2019,26(3):92~98

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  • 在线发布日期: 2019-07-23