Thermal–chemical flooding (TCF) is an effective alternative to enhance heavy oil recovery after steam injection. In this paper, single and parallel sand-pack flooding experiments were carried out to investigate the oil displacement ability of thermal–chemical composed of steam, nitrogen (N2), and viscosity breaker (VB), considering multiple factors such as residual oil saturation (Sorw) postwater flood, scheme switch time, and permeability contrast. The results of single sand-pack experiments indicated that compared with steam flooding (SF), steam-nitrogen flooding, and steam-VB flooding, TCF had the best displacement efficiency, which was 11.7% higher than that of pure SF. The more serious of water-flooded degree, the poorer of TCF effect. The improvement effect of TCF almost lost as water saturation reached 80%. Moreover, the earlier TCF was transferred from steam injection, the higher oil recovery was obtained. The parallel sand-pack experiments suggested that TCF had good adaptability to reservoir heterogeneity. Emulsions generated after thermal–chemical injection diverted the following compound fluid turning to the low-permeable tube (LPT) due to its capturing and blocking ability. The expansion of N2 and the disturbance of VB promoted oil recovery in both tubes. As reservoir heterogeneity became more serious, namely, permeability contrast was more than 6 in this study, the improvement effect became weaker due to earlier steam channeling in the high-permeable tube (HPT).
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Research-Article
Adaptability Research of Thermal–Chemical Assisted Steam Injection in Heavy Oil Reservoirs
Wu Zhengbin,
Wu Zhengbin
State Key Laboratory of Petroleum
Resources and Prospecting,
University of Petroleum,
Beijing 102249, China
Resources and Prospecting,
University of Petroleum,
Beijing 102249, China
Search for other works by this author on:
Liu Huiqing,
Liu Huiqing
State Key Laboratory of Petroleum
Resources and Prospecting,
University of Petroleum,
Beijing 102249, China
Resources and Prospecting,
University of Petroleum,
Beijing 102249, China
Search for other works by this author on:
Wang Xue
Wang Xue
State Key Laboratory of Petroleum
Resources and Prospecting,
University of Petroleum,
Beijing 102249, China
Resources and Prospecting,
University of Petroleum,
Beijing 102249, China
Search for other works by this author on:
Wu Zhengbin
State Key Laboratory of Petroleum
Resources and Prospecting,
University of Petroleum,
Beijing 102249, China
Resources and Prospecting,
University of Petroleum,
Beijing 102249, China
Liu Huiqing
State Key Laboratory of Petroleum
Resources and Prospecting,
University of Petroleum,
Beijing 102249, China
Resources and Prospecting,
University of Petroleum,
Beijing 102249, China
Wang Xue
State Key Laboratory of Petroleum
Resources and Prospecting,
University of Petroleum,
Beijing 102249, China
Resources and Prospecting,
University of Petroleum,
Beijing 102249, China
1
Corresponding author.
Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received April 23, 2016; final manuscript received October 23, 2017; published online November 28, 2017. Editor: Hameed Metghalchi.
J. Energy Resour. Technol. May 2018, 140(5): 052901 (7 pages)
Published Online: November 28, 2017
Article history
Received:
April 23, 2016
Revised:
October 23, 2017
Citation
Zhengbin, W., Huiqing, L., and Xue, W. (November 28, 2017). "Adaptability Research of Thermal–Chemical Assisted Steam Injection in Heavy Oil Reservoirs." ASME. J. Energy Resour. Technol. May 2018; 140(5): 052901. https://doi.org/10.1115/1.4038405
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