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Research Papers: Petroleum Engineering

Effect of CO2 on Heavy Oil Recovery and Physical Properties in Huff-n-Puff Processes Under Reservoir Conditions

[+] Author and Article Information
Songyan Li

College of Petroleum Engineering,
China University of Petroleum (East China),
Qingdao 266580, Shandong, China;
Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada

Binfei Li, Qiliang Zhang, Zhaomin Li

College of Petroleum Engineering,
China University of Petroleum (East China),
Qingdao 266580, Shandong, China

Daoyong Yang

Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
e-mail: tony.yang@uregina.ca

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received November 10, 2017; final manuscript received January 25, 2018; published online March 29, 2018. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 140(7), 072907 (Mar 29, 2018) (10 pages) Paper No: JERT-17-1634; doi: 10.1115/1.4039325 History: Received November 10, 2017; Revised January 25, 2018

In this paper, experimental and numerical techniques have been utilized to quantify heavy oil properties in CO2 huff-n-puff processes under reservoir conditions. Experimentally, fluid properties together with viscosity reduction of heavy oil and interfacial properties between CO2 and heavy oil have been quantified, while five cycles of CO2 huff-n-puff processes have been conducted to determine oil recovery together with component variation of produced and residual oils. Theoretically, numerical simulation has been conducted to analyze the underlying recovery mechanisms associated with the CO2 huff-n-puff processes. CO2 huff-n-puff processes are only effective in the first two cycles under the existing experimental conditions, while the effective sweep range is limited near the wellbore region, resulting in poor oil recovery in the subsequent cycles. As for produced oil, its viscosity, density, resin and asphaltene contents, and molecular weight of asphaltene are reduced, whereas, for the residual oil, they are increased. The asphaltene component in the residual oil shows weak stability compared to that of the produced oil, while the ultimate oil recovery after the fifth CO2 cycle of huff-n-huff processes is measured to be 31.56%.

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Figures

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Fig. 1

Viscosity of dead heavy oil as a function of temperature

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Fig. 3

Schematic diagram of three-dimensional view of the sandpack model

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Fig. 2

Schematic diagram for (a) PVT experiments, (b) IFT measurements, and (c) CO2 huff-n-puff experiments

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Fig. 4

(a) Saturation pressure and swelling factor and (b) viscosity and viscosity reduction ratio as a function of CO2 solubility under different temperatures

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Fig. 5

Equilibrium IFTs for CO2-heavy oil and brine–heavy oil systems at 80 °C

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Fig. 6

Measured and simulated oil production and gas production under standard conditions, and pressure drop as a function of time for the CO2 huff-n-puff processes

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Fig. 7

Relative permeability for (a) oil–water systems and (b) gas–liquid systems

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Fig. 9

(a) Densities and viscosities and (b) SARA contents, and molecular weight of asphaltene of the produced oil as a function of cumulative oil production

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Fig. 10

(a) Oil saturations of the residual oil in different positions of the sandpack model, (b) a digital image of sand with residual oil removed from the sandpack model, and (c) distribution of residual oil saturation of the sandpack model

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Fig. 11

(a) Densities and viscosities and (b) SARA contents, and molecular weight of asphaltene for the residual oil in the sandpack model

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Fig. 12

Measured ATR ratios for the original, produced, and residual oil samples

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Fig. 8

(a) Oil production rate, (b) gas production rate, (c) producing gas–oil ratio, and (d) oil recovery factor as a function of pressure drop for CO2 huff-n-puff processes

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