Gels
·
2025
·Vol. 11
·期 5
·315
·
IF 5.3
Ruping Chen,Hong He,Yuhang Tian,Zixiang Xiong,Wenli Ke,Haihua Pei,Peng Zhang
The viscoelastic branched-preformed particle gel (B-PPG) has been successfully applied to enhance oil recovery in mature reservoirs. However, due to a lack of a clear understanding of the transport characteristics of B-PPG in porous media, the injectivity and plugging efficiency are not ideal, and the incremental oil recovery is not as expected, which poses a great obstacle to the large-scale popularization and application of B-PPG in mature oilfields. Thus, the influences of elastic moduli, matching coefficients, and injection rates on transport characteristics of B-PPG in porous media were investigated by conducting core flow experiments. The results indicate that the elastic modulus of B-PPG can significantly affect the injectivity and plugging efficiency. The higher the elastic modulus is, the more difficult it is to transport in the porous medium. When the particle size is similar, as the elastic modulus increases, the resistance factor (Fr) and residual resistance factor (Frr) increase. When the elastic modulus is similar, as the particle size increases, theFrandFrrincrease. As the matching coefficient decreases, theFrandFrrdecrease, reflecting the improvement of injectivity and the weakening of plugging efficiency. The higher the reservoir permeability, the lower the matching coefficient. When the reservoir permeability ranges from 0.30 to 5.30 μm2, the B-PPG with an elastic modulus of 42.2 Pa and aD50of 525 μm can migrate smoothly into the depth of porous media and form effective plugging. As the injection rate increases, theFrandFrrdecrease, reflecting the improvement of injectivity and the weakening of plugging efficiency. Therefore, to achieve good injectivity and plugging efficiency of the B-PPG suspension, the injection rate should be in the range of 0.5 mL·min−1to 1.5 mL·min−1. Hence, these findings could give an important understanding of the factors affecting the transport characteristics of B-PPG and provide guidance for enhancing oil recovery by B-PPG flooding in mature oilfields.
研究领域:
石油工程
·
流体力学
·
提高采收率
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small Methods
·
2025
·Vol. 9
·期 11
·e01148
·
IF 9.1
Wei Wu,Changsheng Song,Jiafeng Ruan,Nanyu Chen,Fei Yan,Fang Fang,Dalin Sun,Jie Zhao,Yun Song
The combination of Na metal with a 3D scaffold has effectively solved the long-standing problems of sodium metal batteries, including dendrite formation and volume change. However, uncontrollable interfacial reaction and morphology degradation caused by the high surface area of the scaffold are still unsolved. Here, a solvent pretreatment strategy is reported to generate a pre-formed solid electrolyte interface (SEI) protected Na exclusively confined in the scaffold. This pre-formed SEI prevents the reactive Na from the direct contact with the electrolyte, thereby mitigating side reactions. Meanwhile, by removing the highly reactive Na nanoparticles, as well as their low ionic conductivity derivatives on the surface, this exclusively confined Na structure enhances the uniformity of Na plating/stripping and the corresponding ion transport kinetics. Benefiting from this pre-formed SEI optimization, a thin and NaF-riched SEI can be further evolved during cycling. Compared to the pristine counterpart, Na 3 V 2 (PO 4 ) 3 coupled with the anode protected by pre-formed SEI exhibits a 14.9% and 18.9% increase in specific capacity at 25 and −30 °C, respectively. The pre-formed SEI strategy solves the prolonged interfacial issues of high surface area Na metal composite anodes, and brings a new perspective to the plating/stripping behaviors.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Guowen Qian,Peirong Fan,Jiandong Ye
Creating interconnected macropores in calcium phosphate cement (CPC) is an effective strategy to promote its degradation and osteogenesis. However, little attention has been given to the osteogenic effect of the CPC scaffolds with pre-forming and in-situ forming interconnected macropores. Herein, two types of CPC scaffolds were prepared by infiltrating CPC pastes into 3D-printed polycaprolactone (PCL) and poly(lactic-co-glycolic acid) (PLGA) networks. Meanwhile, the sacrificial PCL network within CPC was dissolved to obtain the CPC scaffold with approximately 300 μm macropores, whereas the PLGA network was retained within the CPC to obtain the PLGA/CPC scaffold. The results indicated that the PLGA/CPC scaffold showed higher degradation rate and compressive strength compared to the CPC scaffold with pre-forming interconnected macropores. However, the proliferation rate and alkaline phosphatase activity of mouse bone mesenchymal stem cells cultured with the CPC scaffold were superior to those cultured with the PLGA/CPC scaffold. In addition, greater formation of new bone and material degradation in the CPC scaffold compared to the PLGA/CPC scaffold after implanted in the rabbit femoral defects.
研究领域:
生物材料
·
组织工程
·
生物医学工程
·
骨科
✓ 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）