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Volume 2018, Article ID 2968629, 5 pages
Research Article

Study on Pulse Characteristic of Produced Crude Composition in CO2 Flooding Pilot Test

1Enhanced Oil Recovery Institute, China University of Petroleum, Beijing 102249, China
2Australian School of Petroleum, The University of Adelaide, Adelaide, SA 5005, Australia

Correspondence should be addressed to Tongjing Liu; nc.ude.puc@pucjtl

Received 27 October 2017; Revised 6 February 2018; Accepted 12 February 2018; Published 13 March 2018

Academic Editor: Zhongwei Chen

Copyright © 2018 Pengxiang Diwu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


It has been observed in many laboratory tests that the carbon number of the maximum concentration components (CNMCC) of produced oil varies monotonically with CO2 injection volume at the core scale. However, in CO2 flooding pilot test at the field scale, we find that the CNMCC is usually nonmonotonic function of CO2 injection volume, which is called “pulse characteristic” of CNMCC. To investigate the mechanism of this phenomenon, we analyze the physical process of CO2 flooding in heterogeneous reservoir and explain the reason of the pulse characteristic of CNMCC. Moreover, two 3D reservoir models with 35 nonaqueous components are proposed for numerical simulation to validate the conjecture. The simulation results show that pulse characteristic of CNMCC only occurs in the heterogeneous model, confirming that the pulse characteristic results from the channeling path between wells, which yields nonmonotonic variation of oil-CO2 mixing degree. Based on it, a new method can be developed to identify and quantify the reservoir heterogeneity.