Simulation-based enhanced oil recovery predictions from wettability alteration in the Middle Bakken tight reservoir with hydraulic fractures
Simulation-based enhanced oil recovery predictions from wettability alteration in the Middle Bakken tight reservoir with hydraulic fractures
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DOI：
10.1016/j.fuel.2019.05.016
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发表时间：
2019-10
期刊：
影响因子：
7.4
通讯作者：
R. Sun;H. Pu;Wei Yu;J. Miao;J. Zhao
中科院分区：
文献类型：
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作者：
R. Sun;H. Pu;Wei Yu;J. Miao;J. Zhao
表面活性剂通过改变润湿性、降低界面张力和促进逆流渗吸过程而在致密地层中提高采收率是有希望的。本文以巴肯中部一口井为研究对象，结合现场实际资料，对表面活性剂Huff-n-Puff在巴肯致密油藏中的应用进行了研究。根据实验数据，模拟了表面活性剂溶液对润湿性改变和界面还原的影响。嵌入式离散裂缝模型（EDFM）的方法被用来有效地处理水力裂缝的模型中，在一个快速的方式使用非相邻连接作为一种新的技术，在这项模拟研究。在网格尺寸优化后，我们使用EDFM方法的扇形模型进行表面活性剂Huff-n-Puff敏感性模拟。我们考虑了六个敏感性因素，每个模拟案例都经过历史拟合。根据模拟结果，我们发现抽吸循环次数和表面活性剂浓度是最重要的影响因素，其次是表面活性剂吸附、浸泡时间、注入时间和注入速度。提高采收率的幅度为1.1%~ 25.2%。该研究可为确定影响巴肯中部致密油藏表面活性剂驱油效果的关键参数提供重要依据。
Surfactant enhanced oil recovery is promising in tight formations by altering the wettability, reducing the interfacial tension, and promoting the counter-current imbibition process. In this paper, surfactant Huff-n-Puff in Bakken tight reservoir was studied based on modelling and simulation of a Middle Bakken well using actual field data. The effects of wettability alteration and interfacial reduction by surfactant solution were modeled based on laboratory data. The Embedded Discrete Fracture Model (EDFM) method was used to efficiently handle hydraulic fractures in the model in a fast way using non-neighboring connections as a new technique in this simulation study. We used a sector model with the EDFM method to conduct the surfactant Huff-n-Puff sensitivity simulation after the grid size optimization. We considered six sensitivity factors and each simulation case was conducted after history matching. Based on the simulation results, we found that the number of Huff-n-Puff cycles and the surfactant concentration are the most important factors, followed by surfactant adsorption, soaking time, injection time and injection rate. The percentage of oil recovery increase over the primary oil recovery ranges from 1.1% to 25.2%. This study can provide critical insights of key parameters affecting the surfactant flooding efficiency in Middle Bakken tight oil reservoir.