BMC Chemistry
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2025
·
IF 4.6
Qiming Zheng,Chenming Peng,Wei Qian,Xin Wang,Defeng Wang,Kairui Yang
This investigation developed and evaluated a new type of high-temperature-resistant gel particle system (DPAG), which is specifically designed for conformance control in high-temperature reservoirs. Conventional conformance control systems, including polymer gel systems and foam-based technologies, often suffer from thermal degradation and insufficient plugging stability under high-temperature environments. To address these limitations, DPAG gel particles were synthesized via inverse emulsion polymerization, incorporating thermally stable functional monomers (AMPS and DAC) to create a dual-crosslinking network combining covalent bonds and electrostatic interactions. A comprehensive characterization combining chemical structure assessment, particle size measurement and microscopic morphology examination confirmed the successful synthesis of DPAG gel particles, revealing their uniform size distribution and well-defined morphology. Thermodynamic stability analysis, combined with rheological characterization, revealed that DPAG gel particles exhibit enhanced structural integrity, thermal resistance, and mechanical strength compared to conventional AM gel particles. Swelling kinetic studies revealed that DPAG gel particles exhibit significantly enhanced swelling characteristics, achieved a swelling ratio of 14.6. Experimental results indicated that DPAG microsphere dispersions at concentrations of 0.1% to 0.5% not only maintained excellent injectivity but also achieved remarkable plugging efficiency, reaching up to 98.7%. Particularly under high-temperature conditions, DPAG gel particles displayed outstanding stability, retaining excellent mechanical properties after 30 days with less than 17.4% strength loss. Core flooding experiments demonstrated that DPAG gel particles exhibit both deep migration capability and long-term stability in high-temperature reservoirs, ultimately enhancing oil recovery by 22.4%. These findings strongly indicate the significant potential of DPAG gel particles for well conformance control in high-temperature oilfields.
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DOI
PubMed
高影响因子
Processes
·
2025
·Vol. 13
·期 9
·2903
·
IF 2.8
Ping Guo,Yong Li,Yanbao Liu,Yunlong Zou
In this study, a new type of double crosslinked nanospheres (DCNPM-A) was developed to solve the problem of gas channeling caused by fracture development in the process of CO2oil displacement, and the microsphere system with delayed swelling was successfully synthesized by inverse micro lotion polymerization. The microsphere adopts a dual crosslinking structure of stable crosslinking agent (MBA) and unstable crosslinking agent (UCA), achieving intelligent sealing function of shallow low expansion and deep high temperature triggered secondary expansion. The successful preparation of microspheres was verified by characterization methods such as Zeta potential and SEM, and the effects of reaction temperature, time, initiator and crosslinking agent dosage on microsphere properties were systematically studied. The experimental results show that DCNPM-A microspheres exhibit excellent expansion performance, thermal stability, and acid resistance in acidic, high-temperature, and high mineralization environments. Their expansion ratio can reach 13.5 times, and they can maintain stability for more than 60 days in supercritical CO2environments. Core displacement experiments have confirmed that the microspheres have the best sealing performance in matrices with a permeability of 10 × 10−3μm2and fractures with a width of 0.03 mm. The combination of 0.8 PV injection volume, 0.5 mL·min−1injection rate, and continuous injection method significantly improved the plugging rate and recovery rate of CO2flooding. This study provides new technical support for the efficient development of low-permeability fractured reservoirs.
研究领域:
石油工程
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提高采收率
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高分子材料科学
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油藏工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xinnan Ma,Juan Han,Jiacong Wu,Yang Zhou,Chunmei Li,Lei Wang,Yang Lu,Yun Wang
Efficiently enhancing hydrogen peroxide (H 2 O 2 ) production via photocatalysis remains challenging. This study employed genetic engineering to express His-tagged superoxide dismutase (His-SOD), which was selectively anchored onto the coordinatively unsaturated metal sites of etched UIO-66-NH₂ (UIO-66-NH 2 etch ) through coordination-driven assembly. The synergistic effect between His-SOD and UIO-66-NH 2 etch significantly enhanced both the stability and substrate affinity of the enzyme, while simultaneously boosting the photocatalytic activity of the MOF. Compared to its free counterpart, the immobilized His-SOD exhibits a 62 % increase in catalytic efficiency and a more than threefold extension in thermal deactivation half-life. The fabricated UIO-66-NH 2 etch @His-SOD composite achieved an impressive H 2 O 2 production rate of 3890.37 μmol·g −1 ·h −1 , exceeding that of the pristine UIO-66-NH 2 by over 2.5 times within 1 h and maintaining a 1.7-fold enhancement after 4 h. Owing to SOD's inherent superior antioxidative capabilities, the composite material demonstrates exceptional recyclability, retaining 95 % of its initial catalytic activity after four consecutive cycles. This study achieves specific immobilization of functionalized fusion proteins onto photocatalysts, and represents the first introduction of SOD into photocatalytic H 2 O 2 synthesis. This advancement provides valuable insights for the future integration of biocatalysts and synthetic photocatalysts, opening new avenue for research on photo-enzyme coupled catalysis.
研究领域:
生物催化
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光催化
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酶工程
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纳米材料
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金属有机框架
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基因工程
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PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 22
·5378
·
IF 4.2
Qiaolin Zuo,Zhenzhong Fan,Qingwang Liu,Yuanfeng Fu,Luoqi Cui,Junfeng Yang
Aiming at the problem of excessive swelling of conventional microspheres for oilfield use, a novel amphiphilic polymerizable crosslinker (AE) was synthesized by quaternary ammonium modification of an unstable crosslinker (AE) using acrylamide, 2-acrylamido-2-methylpropanesulfonic acid as the monomers, N,N′-methylene bisacrylamide as the stabilizing crosslinker, ammonium peroxysulfate and sodium bisulfite as the initiator, and water as the solvent by using a reversed microemulsion method. Double-networked nanomicrospheres were prepared. The preparation conditions of the microspheres were optimized by the surface response method, focusing on the effects of the initiator addition and reaction temperature, and total crosslinker addition on the formation of nanomicrospheres. The samples were characterized by FTIR, TGA, laser particle sizer, and SEM to evaluate the retarded expansion performance and the modulation drive performance. The results showed that the optimal conditions for the preparation of microspheres were m(oil phase):m(water phase) = 3:2, stirring speed of 550 r/min, total crosslinking agent dosage of 0.6% (based on the total mass of monomers, hereinafter the same), initiator dosage of 0.30%, reaction temperature of 45 °C, and reaction time of 4 h. Compared with the conventional polymer microsphere PAM, PAE was slow-expanded for 45 d at 60 °C, and the expansion multiplier was about 16 times, with slow-expansion characteristics; the blocking rate of PAE reached 98.3%, the oil repulsion rate was 73.11%, and the increase in the recovery rate could be up to 11.23%. In this paper, a new type of nanomicrosphere material is investigated to realize the efficient implementation of oil field conditioning and driving.
研究领域:
材料科学
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化学工程
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石油工程
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PubMed
高影响因子
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