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Zhao Y, Yang L, Xiao P, Liang Y, Hua X, Tian W, Fang W, Liu B. Molecular Insight into CO 2 Improving Oil Mobility in Shale Inorganic Nanopores Containing Water Films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:17568-17576. [PMID: 39121343 DOI: 10.1021/acs.langmuir.4c01806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/11/2024]
Abstract
CO2 injection into shale reservoirs has been recognized as one of the most promising techniques for enhanced oil recovery and carbon capture, utilization, and storage. However, the omnipresent nanopores and the water films formed near the pore walls affect the understanding of mechanisms of CO2 regulating crude oil mobility in shale nanopores. In this work, we employ molecular dynamics simulations to study the occurrence and flow of CO2 and octane (nC8) mixtures in quartz nanopores containing water films, to illustrate the impact mechanisms of CO2 on nC8 mobility. The results indicate that nC8 exists between water films, and CO2 is mainly miscible with nC8 in the pore center, and a small portion of it accumulates at the interface between nC8 and the water film. CO2 significantly decreases the apparent viscosity of nC8 in both the bulk nC8 region and the nC8-water interface region, improving nC8 fluidity. As the percentage of CO2 in the CO2 and nC8 mixtures increases from 0 to 50%, the mean flow velocities of nC8 in the bulk phase region and the nC8-water interface region increase by 92.85 and 60.64%, respectively. Three major microscopic mechanisms of CO2 improving nC8 fluidity in quartz nanopores with water films are summarized: (i) CO2 reduces friction between nC8 and the water film by increasing the angle between nC8 molecules and the plane of the water film; (ii) CO2 widens the distance between nC8 molecules, causing the volume expansion of nC8 and its viscosity reduction; (iii) CO2 significantly increases the most probable and average velocities of nC8 molecules, thus improving their mobility. Our results enhance the comprehension of how CO2 facilitates oil flow in water-bearing shale reservoirs and the exploitation of unconventional oil resources.
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Affiliation(s)
- Yunlong Zhao
- College of Science, China University of Petroleum (East China), Qingdao 266580, P. R. China
| | | | - Peiwen Xiao
- Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
- Key Laboratory of Nano Chemistry, China National Petroleum Corporation, Beijing 100083, China
| | - Yunhang Liang
- College of Science, China University of Petroleum (East China), Qingdao 266580, P. R. China
| | - Xinlong Hua
- College of Science, China University of Petroleum (East China), Qingdao 266580, P. R. China
| | - Wen Tian
- College of Science, China University of Petroleum (East China), Qingdao 266580, P. R. China
| | - Wenjing Fang
- College of Science, China University of Petroleum (East China), Qingdao 266580, P. R. China
| | - Bing Liu
- College of Science, China University of Petroleum (East China), Qingdao 266580, P. R. China
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Sun Y, Zhang W, Tian J, Meng Y, Zhang L. Research Progress on Displacement Mechanism of Supercritical CO 2 in Low-Permeability Heavy Oil Reservoir and Improvement Mechanism of Displacement Agents. Molecules 2023; 28:6154. [PMID: 37630406 PMCID: PMC10460007 DOI: 10.3390/molecules28166154] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Revised: 08/09/2023] [Accepted: 08/15/2023] [Indexed: 08/27/2023] Open
Abstract
With the continuous growth of global energy demand and the late stage of conventional oilfield exploitation, the demand for developing and utilizing low-permeability heavy oil reservoirs is becoming increasingly urgent. However, the exploitation of low-permeability heavy oil reservoirs faces many challenges due to their high viscosity, low permeability, and complex geological conditions. To overcome these challenges, researchers have gradually introduced SC-CO2 as an oil displacement agent in the exploitation of heavy oil reservoirs. However, the oil displacement mechanism of SC-CO2 in low-permeability heavy oil reservoirs and its improvement mechanism are still not completely understood. The article provides a detailed study and understanding of the oil displacement mechanism of SC-CO2, which involves the expansion of heavy oil volume through SC-CO2 dissolution. This mechanism reduces the capillary resistance and flow resistance during the oil flow process. The permeation of CO2 disrupts the internal structure and arrangement of heavy oil, reducing its viscosity. CO2 extracts both light and heavy components from the heavy oil, reducing the residual oil saturation. In addition, the mechanism of improving the effect of oil displacement agents such as nanoparticles, polymers, and surfactants on SC-CO2 displacement was also explored. By further exploring the mechanisms and improvement mechanisms of SC-CO2 displacement for heavy oil, it can guide the selection and optimization of oil displacement agents. Furthermore, understanding the mechanism can also provide a theoretical basis for engineering practice and technical innovation. While the research on CO2 flooding is analyzed and evaluated, the obstacles and challenges that still exist at this stage are indicated, and future research work on CO2 in low-permeability heavy oil reservoirs is proposed.
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Affiliation(s)
- Yuanxiu Sun
- College of Petroleum Engineering, Liaoning Petrochemical University, Fushun 113001, China
| | - Weijie Zhang
- College of Petroleum Engineering, Liaoning Petrochemical University, Fushun 113001, China
| | - Jinlong Tian
- Baikouquan Oil Production Plant of Petrochina Xinjiang Oilfield Branch, Karamay 834000, China; (J.T.); (Y.M.)
| | - Yanzhao Meng
- Baikouquan Oil Production Plant of Petrochina Xinjiang Oilfield Branch, Karamay 834000, China; (J.T.); (Y.M.)
| | - Liping Zhang
- D&P Technology Research Institute, Petrochina Liaohe Oilfield Company, Panjin 124000, China;
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Seyyedattar M, Ghamartale A, Zendehboudi S, Butt S. Assessment of CO2-Oil swelling behavior using molecular dynamics simulation: CO2 utilization and storage implication. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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Li L, Zhou X, Wang R, Zhang X, Ma S, Su Y, Wang C, Luo W, Sun H. Microscopic experiment study on mechanisms of oil-gas interaction and CO2 -surfactant flooding with different temperatures and pressures. J CO2 UTIL 2023. [DOI: 10.1016/j.jcou.2022.102389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Narayanan Nair AK, Anwari Che Ruslan MF, Ramirez Hincapie ML, Sun S. Bulk and Interfacial Properties of Brine or Alkane in the Presence of Carbon Dioxide, Methane, and Their Mixture. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c00249] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Arun Kumar Narayanan Nair
- Physical Science and Engineering Division (PSE), Computational Transport Phenomena Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Mohd Fuad Anwari Che Ruslan
- Physical Science and Engineering Division (PSE), Computational Transport Phenomena Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Marcia Luna Ramirez Hincapie
- Physical Science and Engineering Division (PSE), Computational Transport Phenomena Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Shuyu Sun
- Physical Science and Engineering Division (PSE), Computational Transport Phenomena Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
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Wang Y, Chen Y, Wang J, Pan Z, Liu J. Molecular Simulation Study on the Density Behavior of n-Alkane/CO 2 Systems. ACS OMEGA 2021; 6:29618-29628. [PMID: 34778633 PMCID: PMC8582050 DOI: 10.1021/acsomega.1c03889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Accepted: 10/20/2021] [Indexed: 06/13/2023]
Abstract
The density and volumetric behavior of three typical n-alkanes (hexane, octane, and decane) influenced by different mole fractions of CO2 injected in them at temperatures from 303 to 363 K and pressures from 3.8 to 8.67 MPa were investigated by performing molecular dynamics simulations. It is shown that the mass density first increases and then decreases with increasing CO2 mole fraction. Correspondingly, the system volume only slightly swells at low CO2 contents while suddenly expanding when the CO2 mole fraction exceeds a value of ∼60%. The calculations of structural properties and interaction energies indicate that at low CO2 mole fractions, there are a few CO2 molecules existing in the gap of alkane molecules, resulting in poor compressibility, while at higher CO2 concentrations, the CO2 molecules begin to separate from the CO2-saturated alkane phase and form a gas phase, leading to higher compressibility. Therefore, at high CO2 mole fractions, the system density and volume can more easily be changed by temperature and pressure than that at low CO2 mole fractions. In addition, since it is harder for alkanes with longer chains to separate from each other, the volume swelling decreases and the density increases with increasing carbon number of n-alkane chains. Finally, we found that the increase in CO2 mole fraction, temperature, and the decrease in alkane chain length would promote the diffusion of both CO2 and alkane molecules. However, the influence of pressure on molecular diffusion is very limited except when P = 8.67 MPa and T = 333 K, where CO2 is in the supercritical state. This work is helpful for understanding the density and volumetric behavior of n-alkane/CO2 mixtures at a molecular level and provides useful information for guiding carbon sequestration and CO2-enhanced oil recovery.
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Affiliation(s)
- Youhui Wang
- College
of Materials Science and Engineering, Zhejiang
University of Technology, Hangzhou 310014, China
| | - Yulong Chen
- College
of Materials Science and Engineering, Zhejiang
University of Technology, Hangzhou 310014, China
| | - Junliang Wang
- College
of Environment, Zhejiang University of Technology, Hangzhou 310014, China
| | - Zhiyan Pan
- College
of Environment, Zhejiang University of Technology, Hangzhou 310014, China
| | - Jun Liu
- Key
Laboratory of Beijing City on Preparation and Processing of Novel
Polymer Materials, Beijing University of
Chemical Technology, Beijing 100029, China
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Zhang W, Guo P, Ge X, Du J, Wang Z. Influence factors on CO2 solubility in cycloalkanes and cycloalkane volume expansion: Temperature, pressure and molecular structure. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115859] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Choudhary N, Che Ruslan MFA, Narayanan Nair AK, Sun S. Bulk and Interfacial Properties of Alkanes in the Presence of Carbon Dioxide, Methane, and Their Mixture. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c04843] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nilesh Choudhary
- Physical Science and Engineering Division (PSE), Computational Transport Phenomena Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Mohd Fuad Anwari Che Ruslan
- Physical Science and Engineering Division (PSE), Computational Transport Phenomena Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Arun Kumar Narayanan Nair
- Physical Science and Engineering Division (PSE), Computational Transport Phenomena Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Shuyu Sun
- Physical Science and Engineering Division (PSE), Computational Transport Phenomena Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
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Sun Y, Sun R, Li S, Liu X, Tang G. Calculation Model of Shale Reserves Considering the Adsorption Layer Based on Molecular Simulation. ACS OMEGA 2020; 5:24138-24144. [PMID: 32984736 PMCID: PMC7513550 DOI: 10.1021/acsomega.0c03794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Accepted: 08/31/2020] [Indexed: 06/11/2023]
Abstract
In this paper, molecular simulation methods are used to construct nanopore models of organic matter, montmorillonite, and quartz. The occurrence state of CH4 molecules in shale nanopores was simulated, and the distribution characteristics of CH4 molecules at different temperatures, pressures, and pore widths were obtained. The thickness and density of the adsorption layer of CH4 molecules at different temperatures and pressures were studied. On the basis of these, a calculation model of shale gas reserves considering adsorption is proposed. The results show that CH4 molecules in shale nanopores present a nonuniform distribution. Two obvious wave peaks form in the space close to the surfaces of the shale nanopore, and the wave peaks increase with the increase of pressure. As the pressure increases, a second peak appears and gradually becomes larger. The adsorption layer formed on the surface of the medium has a certain thickness and density, which are affected by pressure and temperature. In the calculation example, the difference between the calculation results of the shale gas reserve calculation models considering and not considering the adsorption layer is about 26%. The higher the proportion of adsorbed gas, the greater the calculation error, which is related to pressure and adsorption capacity.
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Bulk and interfacial properties of decane in the presence of carbon dioxide, methane, and their mixture. Sci Rep 2019; 9:19784. [PMID: 31875027 PMCID: PMC6930215 DOI: 10.1038/s41598-019-56378-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 12/05/2019] [Indexed: 11/08/2022] Open
Abstract
Molecular dynamics simulations were performed to study the bulk and interfacial properties of methane + n-decane, carbon dioxide + n-decane, and methane + carbon dioxide + n-decane systems under geological conditions. In addition, theoretical calculations using the predictive Peng-Robinson equation of state and density gradient theory are carried out to compare with the simulation data. A key finding is the preferential dissolution in the decane-rich phase and adsorption at the interface for carbon dioxide from the methane/carbon dioxide mixture. In general, both the gas solubility and the swelling factor increase with increasing pressure and decreasing temperature. Interestingly, the methane solubility and the swelling of the methane + n-decane system are not strongly influenced by temperature. Our results also show that the presence of methane increases the interfacial tension (IFT) of the carbon dioxide + n-decane system. Typically, the IFT of the studied systems decreases with increasing pressure and temperature. The relatively higher surface excess of the carbon dioxide + n-decane system results in a steeper decrease in its IFT as a function of pressure. Such systematic investigations may help to understand the behavior of the carbon dioxide-oil system in the presence of impurities such as methane for the design and operation of carbon capture and storage and enhanced oil recovery processes.
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