Experimental study of spontaneous imbibition for oil recovery in tight sandstone cores under high pressure high temperature with low field nuclear magnetic resonance

被引:18
作者
Guo, Xiao [1 ]
Semnani, Amir [2 ]
Ekekeh, Destina Godwin [1 ]
Gao, Zhendong [3 ]
Ostadhassan, Mehdi [4 ,5 ]
Jia, Haowei [1 ]
Fu, Jian [1 ]
Ying, Wang [1 ]
机构
[1] Southwest Petr Univ, Dept Petr Engn, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Peoples R China
[2] Southwest Petr Univ, Sch Geosci & Technol, Chengdu 610500, Peoples R China
[3] Yanchang Petr Grp Co Ltd, Yanan 710075, Peoples R China
[4] Northeast Petr Univ, State Key Lab Continental Shale Hydrocarbon Accum, Minist Educ, Daqing 163318, Peoples R China
[5] Amirkabir Univ Technol, Dept Petr Engn, Tehran, Iran
基金
中国国家自然科学基金;
关键词
Spontaneous imbibition; High-pressure high-temperature; Tight sandstone reservoir; Low permeability reservoir; Fracture; Improved oil recovery; Matrix;
D O I
10.1016/j.petrol.2021.108366
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Spontaneous imbibition (SI) plays a key role in production mechanism of unconventional reservoirs. Trivially, with the goal of getting higher efficiency there always has been an incessantly research activities to develop the technology progressively. In this regard, thermodynamic variables (i.e. pressure and temperature) can directly influence the process performance of SI. Thus, numerous papers have been published by considering normal conditions (e.g. 20 degrees C, 0.1 MPa), high pressure (HP) or high temperature (HT). To bridge an existing gap in the literature, an inhouse built imbibition experimental setup was used to carry out the SI under high pressure-high temperature (HPHT) conditions (50 degrees C, 10 MPa). The core samples used in this study were tight sandstone taken from Yanchang formation, Ordos Basin. Experimental conditions were: 1) simulated formation conditions (50 degrees C, 10 MPa), 2) normal condition (20 degrees C, 0.1 MPa), 3) pulse imbibition (20 degrees C, 8/4 MPa in cyclic alteration) and 4) simulated formation conditions (50 degrees C, 10 MPa) for fractured cores (1/3 and 2/3 length). Moreover, NMR was employed to characterize the dynamic behavior of imbibition for each sample. It was found, samples tested under HPHT conditions yielded higher imbibition efficiency (average of 63.49%) compared to ambient conditions (27.31%). and imbibition efficiency of HPHTSI (max, 73.47%, min, 55.23%) showed early imbibition with higher rate. Ultimately, micropores had the largest imbibition efficiency and matrix core samples exhibited lower recovery than fractured ones (74.6%). Collectively, this study presents the importance of fracture-matrix interaction in tight sandstones which is a crucial component for higher recovery rates.
引用
收藏
页数:13
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