COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Han Jia,Hongyan Wu,Xin Wei,Yugui Han,Qiuxia Wang,Jinyong Song,Jiajun Dai,Hui Yan,Dexin Liu
Emulisons stabilized by surfactants have been used in enhanced oil recovery (EOR) for effective profile control and displacement, whereas the lack of long-term stability especially under harsh reservoir conditions limited their wide application. In this study, Pickering emulsions stabilized by sodium dodecylbenzenesulfonate (SDBS) and anisotropic slice-like AlOOH nanoparticles were systematically studied. The adsorption of SDBS on AlOOH nanoparticles was confirmed by the measurements of zeta potential and Fourier Transform Infrared (FTIR) spectra. The three-phase contact angle tests were conducted to explore the reason for the double phase inversion of the AlOOH/SDBS stabilized emulsions from o/w to w/o and back to o/w again. The optical microscopy images verified the adsorption mechanism of SDBS on AlOOH nanoparticles at the oil/water interface. It was found that the three-dimensional network structure formed by the micro-flocculated modified AlOOH nanoparticles could prevent coalescence and phase separation, resulting in the enhanced stability of the emulsion. The AlOOH/SDBS stabilized emulsion showed the super tolerances in a wide range of shear rates, temperature and electrolyte concentrations. The core flooding tests and microscopic visualization flooding experiments demonstrated that the AlOOH/SDBS stabilized emulsions significantly improved the tertiary oil recovery (33 % of IOIP) via the enhanced displacement and sweep efficiencies. The present study provides a typical Pickering emulsion with great stability under harsh reservoir conditions for EOR.
研究领域:
石油工程
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胶体化学
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界面科学
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DOI
高影响因子
ENERGY & FUELS
·
2026
·
IF 5.3
Hao Ye,Yuan Liu,Chunpeng Zhang,Ming Duan,Shenwen Fang
During surfactant flooding, the significant adsorption loss on rock surfaces often results in a lower-than-expected oil displacement efficiency when the surfactant reaches the target reservoir area. This paper proposes a novel binary composite flooding system composed of a styrene-acrylate copolymer emulsion and alkali. As the acrylate in the styrene-acrylate copolymer emulsion hydrolyzes, the composite system gradually transitions from a water-insoluble polymer nanoparticle dispersion to a polymeric surfactant. By use of the weak adsorption of polymer nanoparticles on rock surfaces, more surfactants can reach the target area. This work first optimized the preparation conditions of the styrene-acrylate copolymer emulsion and measured its static adsorption on quartz sand. Then, the solution properties of the styrene-acrylate copolymer emulsion + alkali binary composite system were studied. Finally, the injectivity and oil displacement performance of the binary composite system in different states (0, 8, and 24 h of hydrolysis) were investigated. Based on the experimental results, the recommended synthesis conditions for the styrene-acrylate copolymer emulsion are acrylate as methyl acrylate (MA), MA to styrene mass ratio of 8:2, initiator dosage of 0.2% of the total monomer mass, reaction temperature of 75 °C, total monomer concentration of 10%, emulsifier dosage of 1.2% of the aqueous phase mass, and reaction time of 4 h. Adsorption experiments showed that the adsorption of the styrene-acrylate copolymer emulsion is lower than that of commonly used surfactants. Injectivity experiments demonstrated that the binary system in different states exhibits good injectivity in cores with gas permeability ≥ 100 mD. When the core permeability was 600 mD, oil displacement experiments indicated that the 24 h hydrolyzed binary system increased the oil recovery by 23.41%, higher than the binary system in other states.
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高影响因子
Polymers
·
2024
·Vol. 16
·期 3
·397
·
IF 4.7
Yubin Liao,Jicheng Jin,Shenglin Du,Yufei Ren,Qiang Li
Clean fracturing fluid has the characteristics of being environmentally friendly and causing little damage to reservoirs. Meanwhile, its backflow gel-breaking fluids (GBFs) can be reutilized as an oil displacement agent. This paper systematically evaluates the feasibility and EOR mechanism of a GBF based on a polymer surfactant as an oil displacement system for reutilization. A rotating interfacial tensiometer and contact angle measuring instrument were used to evaluate the performance of reducing the oil–water interfacial tension (IFT) and to change the rock wettability, respectively. Additionally, a homogeneous apparatus was used to prepare emulsions to evaluate GBF’s emulsifying properties. Finally, core flooding experiments were used to evaluate the EOR effect of GBFs, and the influence rules and main controlling effects of various properties on the EOR were clarified. As the concentration of GBFs increases, the IFT first decreases to the lowest of 0.37 mN/m at 0.20 wt% and then increases and the contact angle of the rock wall decreases from 129° and stabilizes at 42°. Meanwhile, the emulsion droplet size gradually decreases and stabilizes with increases in GBF concentration, and the smallest particle size occurs when the concentration is 0.12–0.15 wt%. The limited adsorption area of the oil–water interface and the long molecular chain are the main reasons that limit the continued IFT reduction and emulsion stability. The oil displacement experiment shows that the concentration of GBF solution to obtain the best EOR effect is 0.15 wt%. At this concentration, the IFT reduction and the emulsification performance are not optimal. This shows that the IFT reduction performance, reservoir wettability change performance, and emulsification performance jointly determine the EOR effect of GBFs. In contrast, the emulsifying performance of GBFs is the main controlling factor for the EOR. Finally, the optimal application concentration of GBFs is 0.15–0.20 wt%, and the optimal injection volume is 0.5 PV.
研究领域:
石油工程
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化学工程
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产品关联
DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2021
·Vol. 79
·期 6
·4323-4337
·
IF 2.87
Cao Mengjing,Cai Qiang,Guo Guangfan,Guo Hong,Chen Yingchao,Zhang Yuping
Polymer microsphere profile control is a promising approach for the profile control of heterogeneous reservoirs. Matching between polymer microspheres after swelling in water and the reservoir pore throat is crucial for profile control. Hydration equilibrium time and swelling ratio are key properties that are a direct result of water shutoff efficacy. In this paper, a hollow structure microsphere with swelling–deswelling properties is synthesized and its physical properties including morphology, particle size distribution, water swelling property and deswelling property are thoroughly examined. Meanwhile, the displacement performances are studied. The results demonstrate that the hollow structure microspheres have good swelling–deswelling properties at different salt concentrations. Compared with two kinds of polymer microspheres with the same material, the hydration equilibrium time of hollow structure microspheres is longer than that of nonhollow polymer microspheres. Moreover, the hollow structure microspheres have an effect on deep plugging. With the hydration time increasing, the tertiary recovery of the hollow structure microspheres solution is higher than that of nonhollow polymer microspheres solution, whether in a homogeneous medium or in a heterogeneous medium.
研究领域:
石油工程
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材料科学
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DOI
高影响因子
Journal of CO2 Utilization
·
2014
·
IF 0
Qingzhao Shi,Lishuai Jing,Weihong Qiao
Poor solubility of heavy hydrocarbons in CO 2 has limited the application of CO 2 -EOR (enhanced oil recovery) in modern oil recovery industry to some extent. Therefore, it is crucial to investigate the solubility regularity of different hydrocarbons in supercritical carbon dioxide (scCO 2 ) in the first place. In this paper, our objective is to explore the solubility of n -alkanes (C 6 H 14 –C 18 H 38 ) in scCO 2 . To measure cloud point pressures, the experiment utilizes high-pressure view chamber, and results for accuracy and repeatability of the experimental method and instrument are evidently positive. Then, cloud point pressures for n -alkanes from 318 K to 343 K show a proximately linear and positive correlation with the temperature; they also increase with expanding chain length of n -alkanes. In addition, the result of x (molar fraction of n -alkane at cloud point pressure) indicates that x has a positive correlation with the pressure at identical temperature, and when pressure is constant, temperature increase will reduce x . Finally, relationship studies between density of CO 2 and x reveal that, density of CO 2 has a positive influence on the solubility of n -alkane, and the Chrastil model corrects ln ρ and ln S data. The measured data align with the Chrastil model, with a maximum AARD value of 9.85%.
研究领域:
化学工程
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石油工程
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热力学
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DOI
Nanomaterials
·
2021
·Vol. 11
·期 6
·1390
·
IF 5.076
Gaihuan Ren,Bo Li,Lulu Ren,Dongxu Lu,Pan Zhang,Lulu Tian,Wenwen Di,Weili Shao,Jianxin He,Dejun Sun
Developing solid-free nanoemulsions with pH responsiveness is desirable in enhanced oil recovery (EOR) applications. Here, we report the synthesis of an interfacial activity controllable surfactant (T−DBA) through dynamic imine bonding between taurine (T) and p-decyloxybenzaldehyde (DBA). Instead of macroemulsions, nanoemulsions can be prepared by using T−DBA as an emulsifier. The dynamic imine bond of T−DBA enables switching between the active and inactive states in response to pH. This switching of interfacial activity was used to gate the stability of nanoemulsions, thus enabling us to turn the nanoemulsions off and on. Using such dynamic imine bonds to govern nanoemulsion stability could enable intelligent control of many processes such as heavy oil recovery and interfacial reactions.Keywords:pH-responsive;nanoemulsions;dynamic covalent bond
研究领域:
化学工程
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材料科学
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胶体与表面化学
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石油工程
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产品关联
DOI
PubMed
高影响因子
Energy Reports
·
2023
·
IF 5.2
Xiangchun Wang,Maozong Gan,Xumin Yang,Peng Zhang,Xiaojun Peng,Yanxin Ju,Yahao Kou,Xing Yu,Lihui Zheng,Chao Wang
Fuzzy-ball fluid is a two-phase fluid composed of fuzzy-ball and base fluid. It can enhance oil recovery by approximately 30% after water flooding and polymer flooding, which has been demonstrated in laboratory experiments and field applications. However, the EOR mechanism of fuzzy-ball fluid still needs further research. In this study, the microstructure of fuzzy-ball was observed using optical and cryo-scanning electron microscopy. The EOR mechanism of fuzzy-ball fluid was investigated by the microscopic glass etching model experiment and inter-molecular force calculation. EOR contribution ratio of three parts of fuzzy-ball was evaluated by the single core flooding experiment. Results showed that fuzzy-ball was further subdivided into fuzzy-ball structure and floss structure. Correspondingly, the EOR effects of fuzzy-ball fluid were mainly divided into three parts: (a) base fluid. Emulsification was the main way for base fluid to enhance oil recovery; (b) fuzzy-ball structure. According to the distribution characteristics of residual oil, the EOR mechanisms of fuzzy-ball structure were mainly as follows: wedging displacement for membranous oil, squeezing-carrying mechanism for columnar oil, and extruding-squeezing mechanism for blind-end oil; (c) floss structure. Floss structure enhanced oil recovery mainly through entanglement and carrying mechanism. Moreover, the EOR contribution ratio of base fluid, fuzzy-ball structure, and floss structure are 18.35%, 50.94%, and 30.71%, respectively. This study elucidates the EOR mechanism of fuzzy-ball fluid and provides guidance for its subsequent field application and performance improvement.
研究领域:
石油工程
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材料科学
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 42
·33083-33088
·
IF 3.84
He Liu,Chunming Xiong,Zhen Tao,Yujiao Fan,Xiaofen Tang,Haiyang Yang
Self-healing systems that can spontaneously repair their damage would significantly improve the safety and prolong the lifetime of man-made materials. As external energy or healing agents are required in most of the self-healing approaches, non-covalently cross-linked polymeric hydrogels with intrinsic healing nature have attracted much attention recently. We present here a P(AM-co-DMAPS) zwitterionic copolymer based self-healing hydrogel, where AM and DMAPS are acrylamide and 3-((2-(methacryloyloxy)ethyl)dimethylammonio)propane-1-sulfonate, respectively. The electrostatic interactions within DMAPS and hydrogen bonding between AM moieties contribute to the physical cross-linking of the polymer chains and self-healing ability of the hydrogel. The reported strategy represents a general and facile route to construct zwitterionic copolymer based self-healable functional hydrogels for potential applications in the field of enhanced oil recovery (EOR).
研究领域:
材料科学
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聚合物化学
·
自修复材料
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产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2017
·
IF 2.473
Qiaoyan Shang,Shuqian Xia,GuanWei Cui,Bo Tang,Peisheng Ma
Interfacial tension (IFT) is crucial for characterizing the phase and interphase behavior in the enhanced oil recovery (EOR) process. CO 2 and N 2 are commonly used as injection gases in the EOR process. In this work, an experimental apparatus using the pendent drop method was adopted to measure IFTs for the EOR process with different injection gases, temperatures (40.0–120.0 °C) and pressures (0.22–17.32 MPa). The relative Gibbs adsorption isotherm ( Γ ij ) of a species i on species j were calculated by the experimental IFTs. Theoretically, new correlations were proposed to predict paraffin IFTs for pure CO 2 and mixture gas (CO 2 + N 2 ) injection. A total of 561 and 268 experimental IFTs were used to derive the correlations for pure CO 2 and mixture gas injection, respectively. The square of correlation coefficient ( R 2 ), root mean square error ( RMSE ) and average absolute relative deviations ( AARD ) for pure CO 2 were 0.9884, 0.58 and 5.45%, respectively. For the mixture gas injection, the R 2 , RMSE and AARD of the correlation were 0.9851, 0.57 and 4.47%, respectively.
研究领域:
石油工程
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化学工程
·
热力学
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 6
·1143-1151
·
IF 7.779
Qian Di,Xixia Zhao,Wenjing Zhu,Yiliang Luan,Zhen Hou,Xiaokun Fan,Yan Zhou,Shutao Wang,Zewei Quan,Jun Zhang
This article proposes a general approach for the preparation of intermetallic nanoparticles of Pt3Sn, PtSn, PtSn2, and PtSn4, triggered by hexamethyldisilazane (HMDS) in conjunction with SnCl2. The ethanol oxidation reaction (EOR) tests demonstrate the improved specific activity of PtxSny intermetallic nanoparticles (PtxSny), due to the lower binding energy between carbon monoxide (CO) and PtxSny, the oxidation state of Sn, and the presence of Pt–Sn bonds on the surface. Strikingly, PtSn with an optimized Pt : Sn ratio of 1 : 1 holds superior EOR performance and stability to other PtxSny intermetallics. In addition, PtxSny intermetallic nanoparticles including PtSn, PtSn2, and even the most Sn-rich PtSn4 hold a higher specific current density than the commercial Pt/C after a long-term test, showing the enhanced stability for the EOR. Furthermore, this method was also successfully extended to the synthesis of other Sn-containing intermetallic nanoparticles, such as Ag3Sn and Cu6Sn5.
研究领域:
材料科学
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电化学
·
纳米技术
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Hu Yang,Aichuang Zhang,Yunfei Bai,Mingyu Chu,Han Li,Yuan Liu,Peng Zhu,Xiaolei Chen,Chengwei Deng,Xiaolei Yuan
Even though extensive efforts have been devoted to mixing Pd nanocrystals with Ni(OH)2 for the enhanced synergy, it remains a great challenge to incorporate nanosized Ni(OH)2 species on the Pd electrode and reveal their synergy. Herein, we present spongelike Pd nanocrystals with the modification of amorphous Ni(OH)2 species. The catalyst configuration is first considered by compositing Pd with Ni(OH)2 species to optimize the Pd–Pd interatomic distance and then constructing a strongly coupled interface between Pd nanostructures and Ni(OH)2 species. For the ethanol oxidation reaction (EOR) and the formic acid oxidation reaction (FAOR), Pd-Ni(OH)2 composites exhibit an impressive mass activity of 4.98 and 2.65 A mgPd–1, respectively. Most impressively, there is no significant decrease in the EOR activity during five consecutive cycles (50 000 s). A series of CO-poisoning tests have proved that the enhanced EOR and FAOR performances involve synergy between Pd nanostructures and Ni(OH)2 species.
研究领域:
催化
·
材料科学
·
电化学
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DOI
PubMed
高影响因子
Materials Today Physics
·
2023
·
IF 11.5
Qi Xue,Zixin Ge,Zihan Yuan,Jiangtao Huang,Bin He,Yu Chen
The highly active, selective and stable anode electrocatalysts for the ethanol oxidation reaction (EOR) are extremely desirable for the application of direct ethanol fuel cells (DEFCs). Herein, one-dimensional Au core@AuPt 0·20 Rh 0.08 alloy shell nanowires (Au@AuPt 0·20 Rh 0.08 CS-NWs) with long aspect ratio and cross-linked network architecture are synthesized. For the EOR, Au@AuPt 0·20 Rh 0.08 CS-NWs display higher peak current density, better resistance to CO poisoning and more lasting stability compared with Au@AuPt 0.28 CS-NWs and commercial Pt black electrocatalyst, which can be attributed to the trimetallic synergistic effect between the Au, Pt and Rh atoms. Specifically, the Rh can promote the C–C bonds and adsorb OH ads while Au can change the electronic structure of Pt, endowing Pt with a high anti-poisoning ability to CO ads and promoting the complete oxidation of various C1 intermediate to CO 2 . This work provides an effective strategy for the rational construction of high-performance Pt-based EOR electrocatalysts by optimizing composition, morphology and architecture.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源材料
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）