D-optimal design for Rapid Assessment Model of CO2 flooding in high water cut oil reservoirs

Song, Zhaojie; Li, Zhiping; Yu, Chunsheng; Hou, Jirui; Wei, Mingzhen; Bai, Baojun; Hu, Yunpeng

doi:10.1016/j.jngse.2014.10.005

Cited by 19 publications

(9 citation statements)

References 27 publications

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“…Carbon dioxide flooding is a winewin strategy because it can enhance oil recovery and simultaneously reduce CO 2 emissions into the atmosphere (Song et al, 2014). Inexpensive and redundant green-house CO 2 gas can be captured then injected into oil reservoirs to enhance oil recovery (Kazemzadeh et al, 2015;Sarma, 2003;Kokal et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

Experimental study of water-based nanofluid alternating gas injection as a novel enhanced oil-recovery method in oil-wet carbonate reservoirs

Moradi

Pourafshary

Jalali

et al. 2015

Journal of Natural Gas Science and Engineering

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Section: Introductionmentioning

confidence: 99%

Experimental study of water-based nanofluid alternating gas injection as a novel enhanced oil-recovery method in oil-wet carbonate reservoirs

Moradi

Pourafshary

Jalali

et al. 2015

Journal of Natural Gas Science and Engineering

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“…The purity of injected CO 2 , the viscosity of formation crude oil, formation temperature, the composition of crude oil, and pore size are all influencing factors of MMP [12][13][14][15]. The main direction of reducing MMP between crude oil and CO 2 is to change the properties of carbon dioxide and crude oil [16][17][18][19]. During experiments, CO 2 is usually injected into the core together with a certain ratio of liquefied gas, light components of crude oil or other miscible solvents (multi-component petroleum ether, methanol, ethanol, etc.)…”

Section: Introductionmentioning

confidence: 99%

How Is Ultrasonic-Assisted CO2 EOR to Unlock Oils from Unconventional Reservoirs?

et al. 2021

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CO2 enhanced oil recovery (EOR) has proven its capability to explore unconventional tight oil reservoirs and the potential for geological carbon storage. Meanwhile, the extremely low permeability pores increase the difficulty of CO2 EOR and geological storage processing in the actual field. This paper initiates the ultrasonic-assisted approach to facilitate oil–gas miscibility development and finally contributes to excavating more tight oils. Firstly, the physical properties of crude oil with and without ultrasonic treatments were experimentally analyzed through gas chromatography (GC), Fourier-transform infrared spectroscopy (FTIR) and viscometer. Secondly, the oil–gas minimum miscibility pressures (MMPs) were measured from the slim-tube test and the miscibility developments with and without ultrasonic treatments were interpreted from the mixing-cell method. Thirdly, the nuclear-magnetic resonance (NMR) assisted coreflood tests were conducted to physically model the recovery process in porous media and directly obtain the recovery factor. Basically, the ultrasonic treatment (40 KHz and 200 W for 8 h) was found to substantially change the oil properties, with viscosity (at 60 °C) reduced from 4.1 to 2.8 mPa·s, contents of resin and asphaltene decreased from 27.94% and 6.03% to 14.2% and 3.79%, respectively. The FTIR spectrum showed that the unsaturated C-H bond, C-O bond and C≡C bond in macromolecules were broken from the ultrasonic, which caused the macromolecules (e.g., resin and asphaltenes) to be decomposed into smaller carbon-number molecules. Accordingly, the MMP was determined to be reduced from 15.8 to 14.9 MPa from the slim-tube test and the oil recovery factor increased by an additional 11.7%. This study reveals the mechanisms of ultrasonic-assisted CO2 miscible EOR in producing tight oils.

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“…However, the overall oil production speed is slow. According to the result of longslim-tube displacement experiment, the MMP of the research area is 29.6 MPa that is higher than the reservoir pressure, so that the research area cannot form the miscible flooding as a whole [46,47]. Therefore, the research for reducing the MMP of carbon dioxide miscible flooding can carve out a new way for comprehensive realization of miscible flooding to significantly improve oil recovery in research area [48].…”

Section: Introductionmentioning

confidence: 99%

Research for reducing the Minimum Miscible Pressure of crude oil and carbon dioxide by injecting citric acid isobutyl ester

Fan

Zhao

et al. 2021

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Carbon dioxide miscible flooding has become one of the important technologies for improving oil recovery. The Minimum Miscible Pressure (MMP) is the key parameter to realize miscible flooding. As the MMP in the research area is higher than the formation fracture pressure, miscible flooding cannot be formed. To address this problem, it is necessary to find a way to reduce the MMP. Citric acid isobutyl ester is chosen to reduce the MMP of carbon dioxide and crude oil in this research. The effect of citric acid isobutyl ester on reducing the MMP was measured by the method of long-slim-tube displacement experiment. The experiment results show that the MMP is 29.6 MPa and can be obviously reduced by injecting the slug of citric acid isobutyl ester. The MMP could decrease gradually with constantly adding the injected slug of citric acid isobutyl ester, but the decrease becomes smaller and smaller. The optimum injected slug size of the chemical reagent is 0.003 PV. Under the condition of the slug size, the MMP is reduced to 23.5 MPa and the reduction is 6.1 MPa.

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D-optimal design for Rapid Assessment Model of CO2 flooding in high water cut oil reservoirs

Cited by 19 publications

References 27 publications

Experimental study of water-based nanofluid alternating gas injection as a novel enhanced oil-recovery method in oil-wet carbonate reservoirs

Experimental study of water-based nanofluid alternating gas injection as a novel enhanced oil-recovery method in oil-wet carbonate reservoirs

How Is Ultrasonic-Assisted CO2 EOR to Unlock Oils from Unconventional Reservoirs?

Research for reducing the Minimum Miscible Pressure of crude oil and carbon dioxide by injecting citric acid isobutyl ester

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