Experimental Study on Reducing CO2–Oil Minimum Miscibility Pressure with Hydrocarbon Agents

Liu, Junrong; Sun, Lu; Li, Zunzhao; Wu, Xingru

doi:10.3390/en12101975

Cited by 26 publications

(13 citation statements)

References 36 publications

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“…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.) to promote the dissolution of CO 2 and crude oil to form a miscible displacement layer, reduce the MMP, and improve oil recovery [20][21][22]. However, due to the consideration of safety and economy, 99.9% CO 2 is injected into the reservoir instead of co-injection of mixed solvents [23].…”

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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Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…Minimum miscibility pressure (MMP), i.e., the minimum pressure making CO 2 and a crude oil mixture miscible in a reservoir, is essential to designing CO 2 flooding as one of the enhanced-oil-recovery (EOR) methods [1][2][3]. The MMP is a key design guideline of injecting-fluid facilities, but a lot of oil fields have reservoir pressures lower than the MMP so that they are not able to implement miscible flow in the South Sumatra basin in Indonesia.…”

Section: Introductionmentioning

confidence: 99%

“…The selection of materials suitable to reduce MMP has been challenging. Much research has examined various chemicals as additives in the CO 2-oil mixture [3,[10][11][12][13][14][15]. Typically, they used long-chained alcohol mixtures, e.g., butanol, pentanol, and hexanol [10,13].…”

Section: Introductionmentioning

confidence: 99%

“…Choubineh et al [12] showed that MMP increased in the presence of impurities, e.g., methane and nitrogen, and proposed ethane and butane as effective materials to reduce MMP. Liu et al [3] suggested a hydrocarbon agent as a good additive. A few pieces of research have shown that acetone (an aprotic ketone solvent), soluble in water, could reduce the interfacial tension (IFT) of the water-oil system, e.g., smart-water flooding (chemical-water flow) [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Ketone Solvent to Reduce the Minimum Miscibility Pressure for CO2 Flooding at the South Sumatra Basin, Indonesia

et al. 2020

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This paper experimentally analyzes the chemical additives, i.e., methanol and ethanol, as alcohol solvents, and acetone as a ketone solvent, and the temperature influencing the minimum miscibility pressure (MMP) that is essential to design miscible CO 2 flooding at an oil field, the South Sumatra basin, Indonesia. The experiments were designed to measure CO 2 -oil interfacial tension with the vanishing interfacial tension (VIT) method in the ranges up to 3000 psi (208.6 bar) and 300 degrees Celsius. The experiment results show that lower temperatures, larger solvent volumes, and the acetone were effective in reducing MMP. The acetone, an aprotic ketone solvent, reduced MMP more than the methanol and the ethanol in the CO 2 -oil system. The high temperature was negative to obtain the high CO 2 solubility into the oil as well as the lower MMP. The experimental results confirm that the aprotic ketone solvent could be effective in decreasing the MMP for the design of miscible CO 2 flooding at the shallow mature oilfields with a low reservoir temperature.

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“…In CO 2 EOR, co-solvent helps CO 2 extract crude oil. Co-solvents, especially polar ones such as water, methanol, acetone, ethyl acetate, toluene, petroleum ether, and ethanol, are used as a modifier in CO 2 extraction performance [5][6][7][8]. A co-solvent interacts either with the solute, solvent, or both [5].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Carbonyl and Hydroxyl Compounds Addition on CO2 Injection through Hydrocarbon Extraction Processes

et al. 2020

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CO2 miscible flooding occurs when injection pressure is higher than the minimum miscibility pressure (MMP) which can exceed the fracture pressure. Co-solvents are expected to reduce the MMP by interacting with various hydrocarbons that depend on the polarity and intermolecular forces of solvent and oil. However, there are limited studies that have investigated co-solvent performance in CO2 injection through an extraction process based on oil compositional analysis. This paper is aimed at studying the effects of carbonyl and hydroxyl compounds on oil extraction and also the mutual interactions of CO2-oil-carbonyl and -hydroxyl. The experiment is conducted by using VIPS (viscosity, interfacial tension, pressure-volume, and swelling) and gas chromatography (GC) apparatuses. The compositional results from GC are utilized to analyze the performance of co-solvents, which are further classified based on the carbon number and molecular structure of oil. Acetone is a non-associated polar compound which reacts easily with and assists CO2 to extract polar-aromatic heavy and slightly polar components such as alkenes and straight-chain alkanes, due to high polarizability and low cohesive forces. Ethanol is a self-associated polar compound which has the capability of extracting high-boiling fractions and slightly polar-aromatic components. Moreover, both co-solvents also assist CO2 to extract non-polar components because they have non-polar end in the alkyl group.

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Experimental Study on Reducing CO2–Oil Minimum Miscibility Pressure with Hydrocarbon Agents

Cited by 26 publications

References 36 publications

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

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

Ketone Solvent to Reduce the Minimum Miscibility Pressure for CO2 Flooding at the South Sumatra Basin, Indonesia

The Effect of Carbonyl and Hydroxyl Compounds Addition on CO2 Injection through Hydrocarbon Extraction Processes

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