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Article

Synergistic Modes and Enhanced Oil Recovery Mechanism of CO2 Synergistic Huff and Puff

1
Unconventional Oil and Gas Institute, China University of Petroleum (Beijing), Beijing 102249, China
2
Jidong Oilfield Company Ltd. Exploration and Development Research Institute, Tangshan 063000, China
3
College of Science, China University of Petroleum (Beijing), Beijing 102249, China
*
Author to whom correspondence should be addressed.
Academic Editor: João Fernando Pereira Gomes
Energies 2021, 14(12), 3454; https://doi.org/10.3390/en14123454
Received: 19 April 2021 / Revised: 4 June 2021 / Accepted: 5 June 2021 / Published: 10 June 2021
With the gradual declining of oil increment performance of CO2 huff-and-puff wells, the overall oil exchange rate shows a downward tendency. In this regard, CO2 synergistic huff-and-puff technologies have been proposed to maintain the excellent effect and extend the technical life of such wells. However, there is no specific research on the mechanism and synergistic mode of CO2 huff and puff in horizontal wells. This study aims to establish the synergistic mode and determine the adaptability and acting mechanism of CO2 synergistic huff and puff. Three synergistic huff-and-puff modes are proposed based on the peculiarity of the fault-block reservoir’s small oil-bearing area and broken geological structure. We establish three typical CO2 synergistic huff-and-puff models and analyze the influence of different geological and development factors on the huff-and-puff performance with numerical simulation. Each factor’s sensitivity is clarified, and the enhanced oil recovery (EOR) mechanism of CO2 synergistic huff and puff is proposed. The sensitivity evaluation results show that the reservoir rhythm, inter-well passage, well spacing, high-position well liquid production rate, and middle-well liquid production rate are extremely sensitive factors; the stratum dip and injection volume allocation scheme are sensitive factors; and the relationship with structural isobaths is insensitive. The EOR mechanism of synergistic huff and puff includes gravity differentiation, supplementary formation energy, CO2 forming foam flooding, and coupling effect of production rate and oil reservoirs. The implementation conditions of the two-well cooperative stimulation mode are the simplest. The two-well model is suitable for thick oil layers with a positive rhythm and large formation dip. The single-well mode requires no channeling between the wells, and the multi-well mode requires multi-well rows and can control the intermediate well’s fluid production rate. Field application at C2X1 block shows a good performance with a total oil increment of 1280 t and an average water-cut reduction of 57.7%. View Full-Text
Keywords: CO2 synergistic huff and puff; complex fault-block reservoir; synergistic mode adaptability; sensitivity analysis; EOR mechanism CO2 synergistic huff and puff; complex fault-block reservoir; synergistic mode adaptability; sensitivity analysis; EOR mechanism
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MDPI and ACS Style

Hou, G.; Ma, X.; Zhao, W.; Diwu, P.; Liu, T.; Hou, J. Synergistic Modes and Enhanced Oil Recovery Mechanism of CO2 Synergistic Huff and Puff. Energies 2021, 14, 3454. https://doi.org/10.3390/en14123454

AMA Style

Hou G, Ma X, Zhao W, Diwu P, Liu T, Hou J. Synergistic Modes and Enhanced Oil Recovery Mechanism of CO2 Synergistic Huff and Puff. Energies. 2021; 14(12):3454. https://doi.org/10.3390/en14123454

Chicago/Turabian Style

Hou, Ganggang; Ma, Xiaoli; Zhao, Wenyue; Diwu, Pengxiang; Liu, Tongjing; Hou, Jirui. 2021. "Synergistic Modes and Enhanced Oil Recovery Mechanism of CO2 Synergistic Huff and Puff" Energies 14, no. 12: 3454. https://doi.org/10.3390/en14123454

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