Evaluation of Displacement Effects of Different Injection Media in Tight Oil Sandstone by Online Nuclear Magnetic Resonance

Ting Chen, Zhengming Yang, Yutian Luo, Wei Lin, Jiaxiang Xu, Yunhong Ding and Jialiang Niu
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Ting Chen: School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
Zhengming Yang: Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China
Yutian Luo: Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China
Wei Lin: School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
Jiaxiang Xu: PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
Yunhong Ding: Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China
Jialiang Niu: PetroChina Bohai Drilling Engineering Company Limited, Tianjin 300280, China

Energies, 2018, vol. 11, issue 10, 1-16

Abstract: In order to evaluate the displacement effect of four kinds of injection media in tight oil sandstone, water, active water, CO 2 , N 2 flooding experiments were carried out in laboratory. Online Nuclear Magnetic Resonance (NMR) spectrometers combine the advantages of NMR technology and core displacement experiments. In the displacement experiment, NMR data of different injection volumes were obtained and magnetic resonance imaging (MRI) was carried out. The results showed that micro and sub-micropores provided 62–97% of the produced crude oil. The enhanced oil recovery ratio of active water flooding was higher than that of conventional water flooding up to 10%. The recovery ratio of gas flooding in micro and sub-micropores was 60–70% higher than that of water flooding. The recovery ratio of CO 2 flooding was 10% higher than that of N 2 flooding. The remaining oil was mainly distributed in pores larger than 0.1 μm. Under the same permeability level, the remaining oil saturation of cores after gas flooding was 10–25% lower than water flooding. From MRI images, the displacement effects from good to bad were as follows: CO 2 flooding, N 2 flooding, active water flooding, and conventional water flooding.

Keywords: online NMR; oil displacement mechanism; tight oil sandstone; water flooding; active water flooding; CO 2 flooding; N 2 flooding (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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