LANGMUIR
·
2025
·
IF 3.9
Mingwei Zhao,Xinyue Yang,Zhenfeng Ma,Ying Li,Xiangjuan Meng,Caili Dai,Yingnan Wang
In the process of spontaneous imbibition to enhance oil recovery (EOR) in low permeability reservoirs, nanoparticles have shown great potential due to their excellent properties. In this study, four novel amphiphilic carbon quantum dots (ACDs) were synthesized by the pyrolysis of citric acid and four long-chain primary amines. The results of high-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) confirmed the successful synthesis of ACDs with an average particle size of 3.4 nm. The results show that the synthesized ACDs have excellent stability, interfacial rheology, and wettability reversal ability. In the spontaneous imbibition experiment, the recovery of the ACD solution was 22.10% higher than that of deionized water. In addition, the influencing factors in the imbibition process were studied in combination with nuclear magnetic resonance (NMR) results. Finally, it is considered that the imbibition process is related to the combined effect of small size, low interfacial tension, and the wettability reversal ability of ACDs. The developed ACDs provide a promising solution for spontaneous imbibition to the EOR, especially in low permeability reservoirs.
研究领域:
石油工程
·
纳米技术
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Weipeng Yang,Tengfei Wang,Zexia Fan
Foam stabilized by particles has been applied in enhanced oil recovery (EOR). However, many difficulties in establishing a foam system with high stability, foamability, and resistance to harsh conditions still exist. In this study, foam stabilized by hydrophobic modified alumina nanoparticles was systematically studied. Sodium cumenesulfonate (SC) was used to modify nanoparticles and generate foam. A competitive effect between nanoparticles and SC was found. Specifically, foam stability increased with SC concentration at lower SC concentration range. Foam with high stability and relatively high foamability was obtained at an SC concentration of 20 mM, and then, foam stability sharply decreased because of the competitive effect. The presence of an electrolyte slowed down the adsorption of SC at the air–water interface by forming an ion pair between the headgroup of SC and the cation, which influences foamability and stability. Meanwhile, the electrolyte also caused detachment of particles from foam due to the decrease of hydrophobicity as a result of the decreased SC adsorption. Despite these effects, the particle-stabilized foam maintained high stability in a wide range of electrolyte concentrations. Sandpack flooding experiments showed that the oil recovery rate increased with SC concentration because of the enhanced foamability and stability, leading to a higher displacement efficiency and water flush resistance.
研究领域:
石油工程
·
胶体科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
·
2021
·
IF 4.346
Shengwei Zhang,Bo Peng,Dan Luo
Adsorption loss of surfactants by rock formations reduces surfactant efficiency and increases cost. We propose a new approach to solve this problem. Xanthan gum/locust bean gum (XLB) and xanthan gum/konjac glucomannan (XKG) were chosen as surfactant carriers. Both XLB and XKG are thermosensitive; they are in a gel state at low temperature and sol state at high temperature. When the temperature near an injection well is low, gelled carriers can shield surfactant charge and reduce adsorption loss of surfactants by the formation. A high temperature deep in the reservoir transforms the carriers into a sol state to release the surfactants. In this way, the transport distance of the surfactants is increased, which enables the surfactants to contact more crude oil. The effects of ratio, pH, and salinity on the rheological properties of the XLB and XKG systems were evaluated to optimize the formulation and define the sol–gel transition temperature (T sol/gel ). The storage modulus and loss modulus of the system was affected by the ratio of rigid glue (XG) and flexible glue (LBG and KGM). Adding acid or base weakened the shear modulus, CaCl 2 and NaCl had little effect on the shear modulus, and KCl significantly increased this property. The shear modulus of these two systems was greatest when the two biogels were mixed in equal proportion, the pH was not adjusted, and 3% KCl was added. Environmental scanning electron microscopy images revealed that KCl transformed the loose porous crosslinked structure into a dense lamellar structure. Sodium lauryl sulfate (SDS) and hexadecyl dimethylamine betaine had little influence on the shear modulus of the system, while cetyl trimethyl ammonium bromide prevented the systems from gelatinizing. The zeta potential and surface tension of XLG (XLB with 2% KCl) and XKG (XKG with 2% KCl) with 3% SDS were measured. The absolute values of their zeta potentials in the gel state were smaller than those in the sol state, which indicates that XLG and XKG effectively shielded surfactant charge. The surface tension decreased with increasing temperature. When the temperature was higher than the T sol/gel , the gel melted completely and the surface tension was almost unchanged. This indicates that the surfactants were released slowly by the carriers before melting was complete. Both XLG and XKG proved to be efficient carriers for surfactants that are used for oil displacement.
研究领域:
石油工程
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Lixiao Xiao,Jirui Hou,Jiaqi Sun,Yulong Yang
Microemulsions demonstrate significant potential for enhancing oil recovery (EOR) owing to their remarkable abilities to reduce interfacial tension, alter wettability, and facilitate solubilization. However, the challenge remains in preparing dilutable single-phase microemulsions with large single-phase regions and tiny droplets. In this study, we developed an EOR-oriented single-phase microemulsion formulated using mixed nonionic-cationic surfactants. The system incorporated a biodegradable double-chain monosaccharide quaternary ammonium surfactant alongside a polyoxyethylene ether surfactant. D -limonene functioned as the oil phase, while propylene glycol butyl ether served as the co-surfactant. Transition regions and microstructures were revealed through conductivity tests and microscopic electron microscopy. Furthermore, the mechanisms of microstructure transition under various phase behaviors were explored by simulating the synergistic effects and interfacial distributions of mixed surfactants through molecular dynamics simulation.
研究领域:
石油工程
·
胶体与界面化学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Zhou Fang,Xue-Ru Cao,Ya-Lan Yu,Min Li
During the process of enhanced oil recovery (EOR), surfactants are injected underground in order to draw more oil from the reservoir. Surface active agent molecules, however, can be easily absorbed by the pore surface of the reservoir rock, causing a massive waste. This paper introduces a novel method for designing a type of microcapsule loading EOR surface activator to solve the absorption problem for surfactants injection. The approach employs microfluidic technique to generate O/W/O double emulsion templates that can be used to fabricate hollowed microcapsules coupled with free radical polymerization. Factors including emulsifier concentrations, flow rates, viscosities and densities of the inner, middle and outer fluids which can affect the formation and morphology of emulsions and microcapsules have been systematically investigated and optimized as well. Additionally, morphological analysis confirms that the as-prepared monodisperse microcapsule has the capacity of encapsulating surfactant molecules owing to its hollowed structure. Finally, the diffusion permeability of the prepared microcapsules is examined, indicating that permeability of the microcapsule membrane can be controlled by adjusting the thickness and cross-linking degree of the microcapsule membrane. Overall, this study provides controllable and versatile preparation for this kind of microcapsule with potential in the field of enhanced oil recovery. The results can also provide valuable guidance for further investigation regarding the “smart” controllable release of EOR surface active agent.
研究领域:
化学工程
·
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
·
2019
·
IF 2.886
Fuwei Yu,Hanqiao Jiang,Fei Xu,Zhen Fan,Hang Su,Junjian Li
In this paper, a new fabrication method was reported for establishment of a 2.5D reservoir micromodel, which incorporated 3D geometry of porous media and visualization of 2D microfluidic chips. Flow physics such as imbibition, rison and rheon were visualized in the new 2.5D reservoir micromodel through water flooding experiments in water-wet and oil-wet 2.5D reservoir micromodels. Corresponding results demonstrated the strong capacity of the presented 2.5D reservoir micromodel to mimic the real 3D porous media. Besides, four theoretical patterns concerning residual oil distributions were obtained based on water flooding, surfactant flooding and polymer flooding experiments. Furthermore, imbibition of a Winsor I type surfactant system was investigated, accompanied by explanation and visualization of two major enhanced oil recovery (EOR) mechanisms, namely microemulsion imbibition and residual oil solubilization, which confirmed the assumptions made based on core imbibition experiments.
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Hang Ye,Qi Liu,Tong Wu,Wanzhen Xue,Chunkai Wang,Kai Cheng,Tiong Michelle,Dan Luo,Chenggang Xian,Yiqun Liu
Asphaltene deposition is a significant issue in CO 2 -EOR, leading to reservoir damage and reduced efficiency. In this study, oil-soluble carbon quantum dots (CQDs) were synthesized to address asphaltene deposition issues, evaluating the inhibitory performance through laboratory experiments and molecular dynamics (MD) simulations. Experimental results demonstrated that CQDs effectively delayed the onset of asphaltene deposition from 45 vol% to 55 vol%, reduced the average particle size of asphaltene aggregates from 1200 nm to approximately 600 nm, and achieved an inhibition rate of 52.7 %. MD simulations revealed that CQDs reduced the mobility of asphaltene molecules and decreased the number of stacked asphaltene model molecules in aggregates from four to two, thereby lowering the risk of aggregation and subsequent deposition. Furthermore, the study showed that CQDs primarily inhibit asphaltene aggregation and deposition by weakening T-shaped or offset stacking interactions between asphaltene molecules. This effect was attributed to the strong interactions between CQDs and asphaltenes, with stabilization energies reaching up to −90 kcal/mol. Asphaltene molecules formed π-π interactions with CQDs through π-electron cloud overlap, dispersing the π-π interactions originally occurring between asphaltene molecules. This ultimately suppressed asphaltene aggregation. These characteristics suggested that CQDs offer a promising new approach to mitigate asphaltene deposition and have the potential to enhance oil recovery in low-permeability reservoirs.
研究领域:
石油工程
·
材料科学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
Arabian Journal of Geosciences
·
2020
·Vol. 13
·期 2
·1-13
·
IF 1.327
Zou Jirui,Yue Xiangan,Dong Jie,Gu Jun,Fu Joseph Yuchun,Wang Liqi,Mou Yufan
In order to enhance the low recovery efficiency in low-permeability and heterogeneous reservoirs resulted by water channeling during water flooding process, a series of flooding experiments using in situ polymerization microsphere (ISPM) with surfactant were conducted to achieve deep profile control in high conductivity water channels. Dynamic pressure measurement showed that ISPM demonstrated good injectability and profile control effect in low-permeability core of 20.22 mD, as the plugging rate was as high as 78.99%. At the same time, the electron microscopy results showed that the ISPM could migrate deeper into the core to form microsphere clusters to block the high conductivity channels. The core flooding experiments showed that the profile control effect of the composite slug consisted of surfactant and ISPM was much better than that of just ISPM alone. The front part of the slug consisting of BA with strong emulsifying capability and ultra-low interfacial tension can better exert the profile control effect of the ISPM and expand the sweep volume of the subsequent displacing agent better than surfactant TS with ultra-low interfacial tension. As a subsequent oil displacing agent after ISPM + BA profile control, surfactant BA with strong emulsifying capability and ultra-low interfacial tension, compared with AES and TS, achieved higher recovery efficiency. In low-permeability and heterogeneous reservoirs, ultra-low interfacial tension is screening crucial characteristic of surfactant, but emulsification capacity also plays a very important role. Combination of surfactant BA and ISPM could fully utilize the profile control effect of ISPM and the oil stripping effect of surfactant; the stage recovery efficiency was as high as 22.52%.
研究领域:
石油工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
·
2018
·
IF 2.382
Mingchen Ding,Miao Gao,Yefei Wang,Zhengtian Qu,Xu Chen
The effects of fracture density, miscibility and production scheme on CO 2 enhanced oil recovery (EOR) in fractured reservoirs were investigated. A series of CO 2 injection experiments were performed in various lengths of core plugs at both fractured and unfractured condition. Results demonstrate that although presence of fractures dramatically reduces the effectiveness of CO 2 flooding, increasing fracture density clearly benefits its recovery potential. The oil recovery mechanism is mainly recognized to be oil swelling at the beginning of CO 2 continuous injection and gradually turns to extraction of lighter hydrocarbons (C 5 C 30 ) with increased injection time. First-contact miscible flooding is more effective than both multi-contact miscible and immiscible flooding and proves its feasibility when fracture density exceeded 5.0 fractures per meter, with the maximum recovery up to 68.1% of original oil in place (OOIP). CO 2 huff-n-puff is very powerful in recovering the residual oil after CO 2 flooding. Fracture density has no major effect on huff-n-puff performance while at lower fracture-density condition, more cycles are required to reach the ultimate oil recovery. Multi-contact miscible CO 2 huff-n-puff has the greatest potential of EOR ability in fractured reservoirs, which can increase the oil recovery to 86.2% OOIP on the basis of CO 2 flooding test.
研究领域:
石油工程
·
提高采收率
·
油藏工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Qi Gao,Bo Wang,Japan Trivedi,Xingguang Xu,Shuai Liu
CO2-responsive foam (CRF) is a highly promising candidate for CO2-enhanced oil recovery (CO2-EOR) because it displays higher stability than the surfactant-stabilized foam owing to the formation of robust wormlike micelles (WLMs) upon exposure to CO2. In this work, the nanoparticle-enhanced CO2-responsive foam (NECRF) was properly prepared using lauryl ether sulfate sodium (LES)/diethylenetriamine/nano-SiO2, and its interfacial properties and EOR potential were experimentally and numerically assessed, aiming to explore the feasibility and effectiveness of NECRF as a novel CO2-EOR technique. It was found that the interfacial expansion elastic modulus increased 6-fold after CO2 stimulation. The modulus continued to increase with the introduction of nano-SiO2 owing to the pronounced synergistic effect of WLMs and nanoparticles. In addition to increasing the viscosity of the foaming liquid, WLMs and nano-SiO2 enhanced the shearing resistance of the NECRF as well. Calculations demonstrated that both the coarsening rate and the size distribution uniformity coefficient of NECRF were markedly lower than that of the LES foam, which subsequently inhibited NECRF decay and greatly improved its dynamic stability. Besides, molecular dynamics simulation revealed that adding inorganic salts to NECRF could notably enhance the foaming performance due to the intensified hydration of surfactant head groups and reduced binding energy of neighboring molecules. Nuclear magnetic resonance-assisted core flooding experiments validated the exceptional capacity of NECRF to sweep the low-permeability region and improve the conformance profile. Overall, these findings may provide valuable insights into the development and application of novel materials and strategies for the CO2-EOR.
研究领域:
石油工程
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Petroleum Science
·
2022
·
IF 4.757
Han Jia,Xin Wei,Qiu-Xia Wang,Yuan-Bo Wang,Shi-Jie Wen,Fang-Ning Fan,Qiang Wang,Zhe Wang,De-Xin Liu,Pan Huang
Asymmetrically modified Janus graphene oxide (JGO) has attracted great attention due to its unique physical chemistry properties and wide applications. The modification degree of Janus nanosheets inevitably affects their interfacial activity, which is essential for their performances in enhanced oil recovery (EOR). In this study, the interfacial properties of Janus graphene oxide (JGO) with various modification degrees at liquid-liquid and liquid-solid interfaces were systematically evaluated via the measurements of interfacial tension (IFT), dilatational modulus, contact angle, and EOR efficiency was further assessed by core flooding tests. It is found that JGO-5 with higher modification degree exhibits the greater ability to reduce IFT (15.16 mN/m) and dilatational modulus (26 mN/m). Furthermore, JGO can construct interfacial and climbing film with the assistance of hydrodynamic power to effectively detach the oil from the rock surface and greatly enhance oil recovery. Moderately modified JGO-2 can highly improve recovery of residual crude oil (11.53%), which is regarded as the promising EOR agent in practical application. The present study firstly focuses on the effects of modification degrees on the JGO interfacial properties and proposes diverse EOR mechanisms for JGO with different modification degrees.
研究领域:
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2014
·Vol. 161
·期 12
·F1202
·
IF 2.859
Hui Wang,Qin Ma
A new nitrogen-doped carbon support for Pt-based electrocatalysts was prepared by carbonizing polypyrrole formed on the surface of WO3 nanoparticles (WO3-CNx). Morphologies of WO3-CNx and PtSn/WO3-CNx were investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. PtSn nanoparticles were well-dispersed on the surface of WO3-CNx. Electrocatalytic results showed that PtSn/WO3-CNx is more active than PtSn/C in the ethanol oxidation reaction (EOR), since smaller PtSn nanoparticles were grown on the surface of WO3-CNx and highly electrically conductive WO3-CNx facilitated the electron transport occurred during the EOR. PtSn/WO3-CNx also exhibited better durability and higher stability in ethanol oxidation reaction than PtSn/C. These results indicated that WO3-CNx has potential to be used as a catalytic support with high-performance for Pt-based electrocatalysts used in fuel cells.
研究领域:
材料科学
·
电化学
·
纳米技术
·
催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）