Simulation-based enhanced oil recovery predictions from wettability alteration in the Middle Bakken tight reservoir with hydraulic fractures

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 Mi...

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Bibliographic Details
Published in:Fuel (Guildford) 2019-10, Vol.253, p.229-237
Main Authors: Sun, Runxuan, Pu, Hui, Yu, Wei, Miao, Jijun, Zhao, Julia Xiaojun
Format: Article
Language:English
Subjects:
Adsorption
Bakken
Computer simulation
EDFM
Enhanced oil recovery
Flooding
Hydraulic fracturing
Imbibition
Injection
Oil recovery
Oil reservoirs
Optimization
Sensitivity
Simulation
Surface tension
Surfactant Huff-n-Puff
Surfactants
Wettability
Wettability alteration
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Summary: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.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2019.05.016