Metal sulfides have attracted significant attention in sodium-ion battery research owing to their high theoretical capacity.However,their practical application is hindered by volume fluctuations and low conductivity c...Metal sulfides have attracted significant attention in sodium-ion battery research owing to their high theoretical capacity.However,their practical application is hindered by volume fluctuations and low conductivity caused by conversion reactions.In this study,hollow cobalt disulfide/nitrogen-doped carbon(CoS_(2)/NC)nanoboxes were synthesized from cobalt-based Prussian blue analogues(PBA)through a sulfidation process.The resulting nanoboxes,approximately 500 nm in size,possess hollow interiors constructed from interconnected primary nanoparticles(~50 nm).The unique hierarchical structure provides abundant void space to accommodate volume changes and shortens transport pathways.Furthermore,the integration of nitrogen-doped carbon matrix significantly enhances the electronic conductivity.When employed as an anode material for sodium-ion batteries,hollow CoS_(2)/NC nanoboxes delivered an outstanding desodiation capacity of 619.4 mAh·g^(-1) at 5 A·g^(-1) over 400 cycles with an average capacity loss of only 0.04%per cycle.This study highlights the potential of PBAs as precursors for synthesizing nanoscale metal sulfides with nitrogen-doped carbon matrices,offering a promising approach to enhance electrochemical performance in energy storage systems.展开更多
Using core, logging and other data, combined with field outcrop deposition, this paper studies the sedimentary genetic types and sedimentary stages of thick sandy braided river interlayer in C oilfield, and divides tw...Using core, logging and other data, combined with field outcrop deposition, this paper studies the sedimentary genetic types and sedimentary stages of thick sandy braided river interlayer in C oilfield, and divides two stages of interlayer and three single-stage braided flow zones. On this basis, geostatistical inversion constrained by logging and discerning River quantitative knowledge base is carried out to predict the distribution range of the main interlayer in the two phases. The production performance test of the blind well and horizontal well shows that the coincidence rate of the prediction results of interlayer with thickness > 1.5 m is 75%. The research shows that the first stage is the main interlayer, mainly composed of mudstone of flood plain origin, with an average thickness of 2.1 m and relatively stable distribution. Based on the interlayer prediction results, the small layer of composite sand body 1 forms a residual oil enrichment area in the high part of the structure due to the wide range of interlayer shielding in the lower part, which is a favorable area for adjusting and tapping potential.展开更多
X oilfield is located in the Western Bohai Sea. During the water injection development process, the oil well productivity continued to decline. The effect of water injection and oil increase is poor. This time, by ana...X oilfield is located in the Western Bohai Sea. During the water injection development process, the oil well productivity continued to decline. The effect of water injection and oil increase is poor. This time, by analyzing the sensitivity of the reservoir, the damage mode of the reservoir is analyzed, the reasons for the poor water injection effect are obtained, because of strong water sensitivity, medium to strong stress sensitivity, and the corresponding measures and suggestions are put forward, such as greater than 4500 mg/l of the salinity of injected water, timely supplement formation energy. Provide basis for the development of similar oil fields.展开更多
基金supported by the Jilin Provincial Education Department(No.JJKH20230615KJ)National Research Foundation of Korea(NRF)grant funded by the Korea Government(MSIT,No.NRF-RS-2024-00446785)+1 种基金the Science and Technology Development Plan Project of Jilin Province,China(No.YDZJ202401373ZYTS)the Higher Education Discipline Innovation Project(No.D18012).
文摘Metal sulfides have attracted significant attention in sodium-ion battery research owing to their high theoretical capacity.However,their practical application is hindered by volume fluctuations and low conductivity caused by conversion reactions.In this study,hollow cobalt disulfide/nitrogen-doped carbon(CoS_(2)/NC)nanoboxes were synthesized from cobalt-based Prussian blue analogues(PBA)through a sulfidation process.The resulting nanoboxes,approximately 500 nm in size,possess hollow interiors constructed from interconnected primary nanoparticles(~50 nm).The unique hierarchical structure provides abundant void space to accommodate volume changes and shortens transport pathways.Furthermore,the integration of nitrogen-doped carbon matrix significantly enhances the electronic conductivity.When employed as an anode material for sodium-ion batteries,hollow CoS_(2)/NC nanoboxes delivered an outstanding desodiation capacity of 619.4 mAh·g^(-1) at 5 A·g^(-1) over 400 cycles with an average capacity loss of only 0.04%per cycle.This study highlights the potential of PBAs as precursors for synthesizing nanoscale metal sulfides with nitrogen-doped carbon matrices,offering a promising approach to enhance electrochemical performance in energy storage systems.
文摘Using core, logging and other data, combined with field outcrop deposition, this paper studies the sedimentary genetic types and sedimentary stages of thick sandy braided river interlayer in C oilfield, and divides two stages of interlayer and three single-stage braided flow zones. On this basis, geostatistical inversion constrained by logging and discerning River quantitative knowledge base is carried out to predict the distribution range of the main interlayer in the two phases. The production performance test of the blind well and horizontal well shows that the coincidence rate of the prediction results of interlayer with thickness > 1.5 m is 75%. The research shows that the first stage is the main interlayer, mainly composed of mudstone of flood plain origin, with an average thickness of 2.1 m and relatively stable distribution. Based on the interlayer prediction results, the small layer of composite sand body 1 forms a residual oil enrichment area in the high part of the structure due to the wide range of interlayer shielding in the lower part, which is a favorable area for adjusting and tapping potential.
文摘X oilfield is located in the Western Bohai Sea. During the water injection development process, the oil well productivity continued to decline. The effect of water injection and oil increase is poor. This time, by analyzing the sensitivity of the reservoir, the damage mode of the reservoir is analyzed, the reasons for the poor water injection effect are obtained, because of strong water sensitivity, medium to strong stress sensitivity, and the corresponding measures and suggestions are put forward, such as greater than 4500 mg/l of the salinity of injected water, timely supplement formation energy. Provide basis for the development of similar oil fields.
