Experimental investigation on molecular-scale mechanism of wettability alteration induced by supercritical carbon dioxide-water-rock reaction

Jia, Zejiang; Ning, Zhengfu; Gao, Xiwei; Wang, Qing; Zhang, Wentong; Cheng, Zhi‐Lin

doi:10.1016/j.petrol.2021.108798

Cited by 16 publications

(14 citation statements)

References 48 publications

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“…In the past 20 years, laboratory and field experiments of CO 2 miscible flooding have been carried out in the Daqing, Jilin, Zhongyuan and Huadong Oilfields in China. However, there are few reports on field trials of CO 2 miscible flooding in ultra-high water-cut reservoirs (Stalkup., 1978;Desch et al, 1984;Akbarabadi and Piri., 2013;Wang et al, 2019;Jia et al, 2021;Huang et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Application of CO2 miscible flooding in ultra-low permeability beach-bar sand reservoir

Yang

Xu²,

Huang

et al. 2022

Front. Earth Sci.

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The beach-bar sand reservoir of the Sha 4 Member of the Shahejie Formation in the Dongying Sag is the main oil-bearing formation in this area. In recent years, its proven reserves have been getting lower and lower, and the poor petrophysical properties of the reservoir have made water injection development difficult. In turn, it results in a rapid decline in elastic development productivity and low oil recovery. In this study, the experimental evaluation and numerical simulation research on the adaptability of CO2 flooding in beach-bar sand reservoirs are carried out on the basis of fully investigating the successful examples of CO2 flooding conducted by the previous. According to the geological characteristics of the reservoir in the CL area of the Dongying Sag, the reasonable reservoir engineering parameters and surface injection procedures for the CO2 flooding have been formulated. Experiments show that after the completion of water flooding, the recovery factor of the CO2 continuous flooding is 85.64%. It proves that the recovery factor of the CO2 flooding is higher than that of the water flooding. Field tests have shown that CO2 molecules in beach-bar sand reservoirs behave in a supercritical state underground, which is easier to being injected into the reservoir than water. In addition, the displacement distance of the CO2 is obviously larger than that of the water injection development. The gas-oil ratio variation of different flooding types is different, and CO2 flooding can effectively increase the formation energy, and improve the oil recovery and economic benefits of this type of reservoir.

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Section: Introductionmentioning

confidence: 99%

Application of CO2 miscible flooding in ultra-low permeability beach-bar sand reservoir

Yang

Xu²,

Huang

et al. 2022

Front. Earth Sci.

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“…# This is a paper for the 14 th International Conference on Applied Energy -ICAE2022, Aug. [8][9][10][11]2022, Bochum, Germany.…”

Section: Introductionmentioning

confidence: 99%

“…The interaction of functional groups is manifested as various microscopic forces [6] . Therefore, the intermolecular forces can be used to understand the interface characteristics of CO2brine-rock, and then reveal the wettability alteration mechanism of tight sandstone reservoirs [8] .…”

Section: Introductionmentioning

confidence: 99%

“…Fourier Transform infrared spectroscopy (FTIR) is the best method to characterize the functional groups on the rock surface. The movement of functional groups obeys the law of quantum mechanics, and the energy absorption will lead to energy level transition [8][9] . At the same time, the vibrational energy of the covalent bond of the functional group atoms will change correspondingly.…”

Section: Introductionmentioning

confidence: 99%

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Insights into mechanism of wettability alteration caused by CO2-brine-rock interactions from interfacial features of brine-rock viainter molecular forces

Zejiang¹,

Jia²,

Ning³

et al. 2022

Preprint

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Wettability is a significant attribute in CO2 geosequestration and CO2 Enhanced Oil Recovery (CO2-EOR) operations, and affects the transport law, capture capacity, sealing capacity and leakage possibility of supercritical CO2 in tight sandstone reservoirs. However, the supercritical CO2-brine-rock reaction leads to wettability alteration of tight sandstone, and the mechanism remains unclear. In this paper, Zeta potential measurement, Fourier Transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM) were used to characterize the surface properties of tight sandstone. Results show that with the increase of reaction time, the mineral composition of tight sandstone changes, the absolute value of zeta potential decreases, the electrostatic force decreases, but the content of hydrophilic uncharged groups increases, the van der Waals force and hydrogen bond force increase, and finally the hydrophilicity increases.

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“…The following question may come up: whether the molecular groups of reservoirs can be altered with an electric field and further to improve oil recovery? This is because the wettability of reservoirs is closely related to the molecular groups . Generally, the reservoirs with a high water-wet property enhance oil recovery.…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Changes in the Molecular Groups of Tight Sandstones in Response to an Electric Field

et al. 2021

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The electric field method proved in the lab and oil fields is an effective and fast way to significantly improve oil recovery, which can be applied to greatly realize the urgent-need requirements for energy, especially in tight sandstones. Generally, the changed molecular groups treated with an electric field modulate the wettability of reservoirs, affecting the final oil recovery. Herein, the investigation of the impact of the electric field on the molecular groups of reservoirs is imperative and meaningful. In this paper, tight sandstones were placed into a particular instrument and subjected to various strengths of the electric field. Nine treated powders and one untreated powder of tight sandstones were processed by Fourier transform infrared spectroscopy (FTIR) and Xray photoelectron spectroscopy (XPS) experiments. FTIR results show that the electric field decreases aromatic groups, C−O groups, COOH groups, and aliphatic groups, whereas it increases CC groups, CO groups, and OH groups. Interestingly, the changes in C−O groups, CO groups, COOH groups, and OH groups are all the competitive results of production and consumption during the treatment process. With regard to C−O groups and COOH groups, the consumption has an advantage over the production on the content of functional groups, and the situations for C=O groups and OH groups exhibit a contrary trend. The fitted result of XPS proves the fact that the electric field improves CO groups, OH groups, and COOR groups, whereas it reduces C−O groups, supporting that the molecular groups can be mutually transformed during the electric field treatment. The obtained knowledge is beneficial to the study of electric field-related technologies on the molecular groups of reservoirs.

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Experimental investigation on molecular-scale mechanism of wettability alteration induced by supercritical carbon dioxide-water-rock reaction

Cited by 16 publications

References 48 publications

Application of CO2 miscible flooding in ultra-low permeability beach-bar sand reservoir

Application of CO2 miscible flooding in ultra-low permeability beach-bar sand reservoir

Insights into mechanism of wettability alteration caused by CO2-brine-rock interactions from interfacial features of brine-rock viainter molecular forces

Unveiling the Changes in the Molecular Groups of Tight Sandstones in Response to an Electric Field

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