JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 45
·e53110
·
IF 3.057
Qihai Wang,Bin Chen,Xiujun Wang,Yifan Wang,Weixin Hu,Ming Duan,Shenwen Fang
Polyacrylamide (PAM) microsphere has been widely used in the field of profile control to reduce water cut in heterogeneous reservoirs. However, its mechanical strength and plugging ability are still needed to be improved. In this paper, a core-shell structure and surface-hydrophobic polyacrylamide M-P(AM-PEP) microsphere was prepared by using acrylamide (AM), block polyether macro monomer (PEP) and modified SiO 2 with double bond on the surface as monomers through dispersion polymerization. After the optimization of synthesis conditions, the results of SEM and TEM confirmed that M-P(AM-PEP) microsphere had the nano-scale spherical shape and the inorganic core/polymer shell structure, while the contact angle test results showed that M-P(AM-PEP) microsphere had the surface-hydrophobicity. Swelling experiments presented that the size of M-P(AM-PEP) microsphere can be increased by 6 times and had obvious self-gathering behavior. The inorganic core and self-gathering behavior are helpful for improving mechanical strength and plugging ability of PAM microsphere, respectively. Profile control and oil recovery improvement experiment showed that injecting 0.1 PV M-P(AM-PEP) microsphere can decrease the water cut and increase the oil recovery of 17.95%. This new microsphere could be an efficient technology for the profile control in the heterogeneous reservoir.
研究领域:
石油工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Petroleum Science
·
2022
·
IF 4.757
Long Xu,Xu Liu,Hong-Yu Ding,Huan Zhang,Lei Liu,Jing-Hui Li,Hou-Jian Gong,Ming-Zhe Dong
Amide- and alkyl-modified nanosilicas (AANPs) were synthesized and introduced into Xanthan gum (XG) solution, aiming to improve the temperature/salt tolerance and oil recovery. The rheological behaviors of XG/AANP hybrid dispersions were systematically studied at different concentrations, temperatures and inorganic salts. At high temperature (75 °C) and high salinity (10,000 mg⋅L −1 NaCl), AANPs increase the apparent viscosity and dynamic modulus of the XG solution, and XG/AANP hybrid dispersion exhibits elastic-dominant properties. The most effective concentrations of XG and AANP interacting with each other are 1750 mg⋅L −1 and 0.74 wt%, respectively. The temperature tolerance of XG solution is not satisfactory, and high temperature further weakens the salt tolerance of XG. However, the AANPs significantly enhance the viscoelasticity the XG solution through hydrogen bonds and hydrophobic effect. Under reservoir conditions, XG/AANP hybrid recovers approximately 18.5% more OOIP (original oil in place) than AANP and 11.3% more OOIP than XG. The enhanced oil recovery mechanism of the XG/AANP hybrid is mainly increasing the sweep coefficient, the contribution from the reduction of oil-water interfacial tension is less.
研究领域:
材料科学
·
石油工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jie Cao,Yingpeng Chen,Xiujun Wang,Jian Zhang,Ying Li,Shanshan Wang,Xinming Wang,Chunlin Liu
In this article, we prepared Janus sulfonated graphene oxide nanosheets (JSGO) by a facile method for large-scale production. Unlike previous single-sided modifications of graphene oxide (GO), the smart JSGO nanofluid that can automatically find oil was obtained by modifying the double sides of GO. Benefiting from the introduction of sulfonic acid groups, JSGO had outstanding dispersity and stability under extreme conditions. Furthermore, JSGO exhibited excellent interfacial properties due to its amphiphilic characteristic. On the one hand, JSGO can reduce interfacial tension by 71% and form a strong interfacial film at the oil–water contact, achieving piston displacement with high sweep efficiency. On the other hand, JSGO had a strong ability in wettability reversal that can turn the hydrophobic surface into completely hydrophilic. These excellent properties of JSGO nanofluid contributed to obtaining an additional 18.4% recovery factor at low concentration (100 mg/L) and low injection volume (0.3 pore volume). As a result of the simple preparation, high performance, and excellent dispersion stability of JSGO nanofluid, it can be utilized as a chemical agent to enhance oil recovery in the harsh environment of reservoirs.
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
ENERGY & FUELS
·
2018
·
IF 3.024
Di Wang,Shanshan Sun,Te Sha,Tongjing Liu,Honghong Dong,Kai Cui,Hailan Li,Yejing Gong,Jirui Hou,Zhongzhi Zhang,Pengcheng Fu
Wettability modification is one of the main mechanisms to increase oil recovery from low-permeability oil reservoirs. Nanofluids composed of nanoparticles can be used as modifiers to alter wettability from oil-wet to water-wet condition thus to promote hydrocarbon recovery. Biosurfactants, which are candidates to replace synthetic surfactants for industrial applications, have the potential to prepare nanofluids. In this study, nanofluids prepared by dispersing SiO2 nanoparticles in rhamnolipid solution (hereby named bionanofluids) were considered potential wettability modifiers to apply to petroleum recovery from low-permeability sandstone reservoirs. Analyses via visual observation, optical absorbance measurement, ζ-potential determination, and particle size measurements demonstrated that the bionanofluids with 25 ppm rhamnolipids maintained an optimal stability. The effect of bionanofluids on wettability alteration was investigated through contact angle measurement and imbibition test. The results showed that bionanofluids could alter the wettability of oil-wet sandstone to strongly water-wet. The best performance was achieved with a nanoparticle concentration of 1000 ppm. Additionally, a micromodel test using rhamnolipid solution and bionanofluid was carried out to evaluate the synergistic effects of SiO2 nanoparticles and rhamnolipid on displacing oil. Bionanofluid injection following biosurfactant flooding was shown to improve oil recovery, yielding an additional 5% production. These results reveal that the bionanofluid prepared with SiO2 and rhamnolipids not only remained stable but also provided a potential way for enhanced oil recovery.
研究领域:
石油工程
·
纳米技术
·
表面化学
·
提高采油率
·
胶体与界面科学
✓ 已验证
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 6
·1413
·
IF 5
Dongyin Wang,Changfeng Chen,Xiaojuan Hu,Fei Ju,Yangchuan Ke
Novel polymer nanocomposites of methacryloyloxy ethyl dimethyl hexadecyl ammonium bromide-modified montmorillonite (O-MMt) with acrylamide/sodiump-styrene sulfonate/methacryloyloxy ethyl dimethyl hexadecyl ammonium bromide (ASD/O-MMt) were synthesized via in situ polymerization. The molecular structures of the synthesized materials were confirmed using Fourier-transform infrared and1H-nuclear magnetic resonance spectroscopy. X-ray diffractometry and transmission electron microscopy revealed well-exfoliated and dispersed nanolayers in the polymer matrix, and scanning electron microscopy images revealed that the well-exfoliated nanolayers were strongly adsorbed on the polymer chains. The O-MMt intermediate load was optimized to 1.0%, and the exfoliated nanolayers with strongly adsorbed chains were controlled. The properties of the ASD/O-MMt copolymer nanocomposite, such as its resistance to high temperature, salt, and shear, were significantly enhanced compared with those obtained under other silicate loads. ASD/1.0 wt% O-MMt enhanced oil recovery by 10.5% because the presence of well-exfoliated and dispersed nanolayers improved the comprehensive properties of the nanocomposite. The large surface area, high aspect ratio, abundant active hydroxyl groups, and charge of the exfoliated O-MMt nanolayer also provided high reactivity and facilitated strong adsorption onto the polymer chains, thereby endowing the resulting nanocomposites with outstanding properties. Thus, the as-prepared polymer nanocomposites demonstrate significant potential for oil-recovery applications.Keywords:copolymer nanocomposite;controlling exfoliated O-MMt nanolayer;high-temperature resistance;salt resistance;enhanced oil recovery
研究领域:
材料科学
·
纳米技术
·
石油工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Xinru Li,Dangge Gao,Maochang Liu,Lijun Zheng,Pengyu Li,Bin Lyu
We report the design and synthesis of two kinds of amphiphilic Janus SiO 2 nanoparticles , including polyacrylic acid/polystyrene (PAA/PS) Janus SiO 2 and polyacrylic acid/polymethylmethacrylate (PAA/PMMA) Janus SiO 2 . The amphiphilic Janus SiO 2 nanoparticles can effectively stabilize polystyrene butyl acrylate (P(St-BA)) composite microspheres , forming low-cost oil displacing systems to improve the oil recovery of heterogeneous and low-permeability reservoirs. Among them, the PAA/PS Janus SiO 2 stabilized P(St-BA) are demonstrated with good injection, migration, and plugging performance, as well as high temperature and salt resistance. These advantages enable the system an oil recovery increment of 32%. In addition, the microspheres also present good enhanced oil recovery potential in heterogeneous reservoirs, especially for cores with a permeability ratio of 2.0. In principle, the oil displacement of this system is achieved by the synergic effect of amphiphilic Janus SiO 2 nanoparticles and composite microspheres. This work thus provides a promising method for high-performance yet low-cost oil recovery improvement.
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
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
·
2023
·
IF 5.3
Mao Chen,Leiting Shi,Zhongbin Ye,Shanshan Zhu,Xiao Wang,Xuwei Liang,Zheng Shu,Hong Chen
This paper discussed the selection of functional monomers and optimal synthesis conditions for hyperbranched copolymer named as HVR, a novel polymer flooding chemical, intended to enhance offshore heavy oil recovery. The potential application of HVR as a polymer for oil displacement was also evaluated. Through experiments and molecular simulations, functional monomers AOS and OP-10 for Bohai heavy oil were screened out due to their high viscosity reduction rates for oil, both above 90%. Moreover, the interaction energy calculation results suggested that AOS and OP-10 were more likely to spontaneously disperse asphaltene aggregation. Furthermore, the influence of various factors on the synthesis of HVR was discussed using orthogonal design, and optimal synthesis conditions were determined. The optimal conditions for HVR synthesis are as follows: polymerization concentration of 30 wt %, initiator dosage of 1 wt %, initiation temperature of 50 °C, and system pH of 7; the sum of OP-10 and AOS accounts for 29.9 wt %, with a molar ratio of 1:1; the total amount of AM and AA accounts for 79.9 wt %, with a mole ratio of 6.5:3.5; and 3.0 G PAMAM accounts for 0.2 wt %. Moreover, HVR demonstrated good mobility control capacity and improved the recovery of heavy oil significantly in core flooding tests. Injecting a slug of 0.3 PV of HVR led to the additional recovery of 21.96 and 16.04% for oil viscosities of 350 and 500 cP, respectively. Notably, HVR’s additional recovery was over 7% higher than that of conventional hydrophobically associating polymer. These findings highlight the potential of HVR as a novel polymer to enhance the heavy oil recovery.
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
Geoenergy Science and Engineering
·
2024
·
IF 0
Xiang Yan,Caili Dai,Siwei Meng,Zhijie Wei,Xu Jin,He Liu,Yongge Liu,Yining Wu
Spontaneous imbibition (SI) has been proposed as a crucial approach to enhance oil recovery in unconventional reservoirs. Previous research suggests that wettability alteration rather than oil-water interfacial tension (IFT) reduction is the key mechanism for imbibition oil recovery enhancement. However, our experimental results indicate that for asphaltene-adsorbed oil-wet surfaces it's challenging to substantially modulate wettability . In such oil-wet pores, the negative capillary force cannot function as an imbibition driving force, and hence, the method of altering wettability and maintaining the oil-water IFT at relatively high values to enhance imbibition efficiency is insufficiently applicable. When the capillary cannot work, reducing the IFT to ultra-low levels to induce the transformation of the imbibition pattern may be more effective for imbibition efficiency enhancement. In this paper, low-field nuclear magnetic resonance (NMR) was employed to monitor the SI process. The results suggested that for the asphaltene-adsorbed oil-wet tight sandstone, the surfactants combined system with ultra-low oil-water IFT possessed the highest oil recovery, followed by the medium-IFT systems and high-IFT systems. The spontaneous formation of emulsion was observed when the IFT value was reduced to the ultra-low level. Oil droplets can pass through the small pores easily since the deformability of oil is greatly enhanced. The ultra-low IFT system transforms the imbibition pattern from capillary force-driven to gravity-driven, and exhibits the highest oil utilization rate in micropores , mesopores , and macropores among all imbibition agent systems, thereby having the highest total oil recovery. Consequently, the imbibition-enhancing potential of the ultra-low IFT system is considerable and deserves more attention, especially for the oil-wet pores that can hardly be altered to the water-wet state.
研究领域:
石油工程
·
储层工程
·
化学工程
✓ 已验证
DOI
JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Yingpeng Chen,Jie Cao,Ying Li,Hongbo Zeng
As the challenge of enhancing oil recovery from reservoirs continues to grow, it becomes increasingly crucial to seek out new materials for oil displacement. Janus graphene oxide (JGO) with excellent interfacial activity stands out as a promising candidate, which enables it to locate crude oil and effectively displace it towards production wells. One key advantage of JGO is its ability to reduce interfacial tension and create interfacial films, attributed to JGO nanosheets adsorbing at oil–water interfaces. Another noteworthy property of JGO is its capacity to transform oil-wet rock surfaces into water-wet surfaces, which is because JGO nanosheets can interact hydrophobically with crude oil molecules on rock surfaces. In addition, JGO helps mitigate capillary resistance by altering the concave oil–water front to a flat state. Microscopic displacement shows that JGO nanosheets enlarge the sweep efficiency and oil-washing efficiency of water. Nuclear magnetic resonance experiment indicates that JGO nanofluid can increase oil recovery by 17.1 %. This research presents a comprehensive exploration of the interfacial activity of Janus nanofluid, spanning from the molecular scale to the micro and core scales.
研究领域:
材料科学
·
石油工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Petroleum Science
·
2022
·
IF 4.757
Guang Zhao,Li-Hao Liang,Dong-Fang Lv,Wen-Juan Ji,Qing You,Cai-Li Dai
A novel nanofluid of modified carbon black (MCB) nanoparticles was initially developed for enhanced oil recovery (EOR) in low permeability reservoirs. The MCB nanoparticles were obtained via a three-step reaction involving modification by oxidation, acyl chlorination, and activated grafting. MCB nanoparticles were spherically dispersed, with an average size of 72.3 nm. Compared with carbon black (CB) nanoparticles, dispersed MCB nanoparticles can effectively reduce the oil–water interfacial tension (IFT) to 10 −2 mN/m and change the surface wettability of sand particles. Based on the results of core flooding experiments, the MCB nanoparticles exhibited a better EOR capacity than surfactants and CB nanoparticles, and the final oil recovery was significantly increased by 27.27%. The core scanning test showed that the MCB nanoparticles could plug high permeability channels by adsorbing onto the surfaces of sand particles and forming larger aggregates that bridge across pores or throats, resulting in a higher swept volume. The synergistic effects of improved swept volume and oil displacement efficiency were the EOR mechanisms of the MCB nanoparticles. The studies indicate that these MCB nanoparticles have excellent potential for EOR in low permeability reservoirs.
研究领域:
石油工程
·
纳米技术
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 58
·33256-33268
·
IF 2.936
Shifeng Gao,Zhaozheng Song,Di Zhu,Fang Lan,Qingzhe Jiang
A series of carboxybetaine surfactants, 2-((4-(alkoxy)-3,5-dimethylbenzyl)dimethyl-ammonio)acetate (CnOBCb, where n represents the hydrocarbon chain length of 12, 14, 16 and 18), were synthesized by an efficient and high-yield route for the first time. The surface activities and aggregation behavior of CnOBCb in aqueous solution were investigated by equilibrium surface tension, interfacial tension, steady-state fluorescence, dynamic light scattering (DLS), cryogenic transmission electron microscopy (cryo-TEM) and negative-staining transmission electron microscopy (TEM) measurements. In comparison with conventional N-alkylbetaine surfactants (CnCb), the CnOBCb species, with a phenyl group introduced in the hydrophobic tail, exhibited excellent surface activities, including lower critical micelle concentration (cmc), lower surface tension and stronger adsorption tendency at an air/water interface. CnOBCb also displayed high efficiency in reducing the toluene/water interfacial tension, with C12OBCb achieving an ultralow interfacial tension (10−3 mN m−1) at concentrations from 0.2 to 1 mmol dm−3. The fluorescence intensity ratio and the scattering intensity in DLS measurements changed remarkably at concentrations around the cmc. Furthermore, the CnOBCb species spontaneously formed vesicles above the cmc in aqueous solution, and the size of the aggregates increased with increasing surfactant concentrations. Flooding experiments showed that CnOBCb could effectively improve oil recovery by 7.85–10.55%.
研究领域:
化学
·
材料科学
·
胶体与表面化学
·
石油工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）