Casing deformation is a widespread problem in a certain block of Jiaoshiba Shale Gas Field in Sichuan Basin,China,and it severely limits the development benefits of shale gas in that block.Based on the spatiotemporal ...Casing deformation is a widespread problem in a certain block of Jiaoshiba Shale Gas Field in Sichuan Basin,China,and it severely limits the development benefits of shale gas in that block.Based on the spatiotemporal characteristics of block formation,fracture development,and casing deformation occurrence,this paper employs an integrated geological—engineering research approach to identify the primary mechanisms governing casing deformation within the block and proposes countermeasures to prevent such deformation.The present research indicates the following findings:(1)The block has undergone multiple phases of tectonic superposition,with fracture development serving as the geological factor causing casing deformation.(2)Fracturing activation constitutes the engineering factor causing casing deformation,with 4 mm of formation slip inducing deformation.(3)The fracture activation risk map shows that Class Ⅰ and Class Ⅱ fractures account for 73.36%of the total recorded in the block.Within the most susceptible Class I risk zone,the critical activation pressure increment for fracturing operations ranges from 13.43 MPa to 13.99 MPa.Based on the distribution of casing failure risk zones identified in the fracture activation risk map,this paper proposes relevant technical countermeasures for preventing casing failure from three perspectives:shale gas well location deployment,drilling techniques,and fracturing techniques.These measures provide robust support for safeguarding the integrity of casing systems within the studied block.展开更多
While the global waste crisis is intensifying,we are missing a crucial opportunity to address this challenge by embracing a transformative approach:engineered microbial consortia have the potential to revolutionize in...While the global waste crisis is intensifying,we are missing a crucial opportunity to address this challenge by embracing a transformative approach:engineered microbial consortia have the potential to revolutionize industrial waste management,reduce greenhouse gas emissions for climate mitigation,and promote a sustainable bioeconomy.Greenhouse gas emissions(GHG)from industrial processes pose a notable threat to planetary health[1].The need for biotechnological solutions specifically targeting CO_(2) capture and recycling for bio-based compounds and energy production is clear but far from achieved[2].There are one trillion microorganisms with a pangenome covering an unspeakable potential of processes.Microbes could provide a solution to many of the challenges our planet is currently facing,such as restoring environmental health,substituting fossil fuels-originating chemicals and products with biomassoriginating ones,enabling regenerative agriculture,restoring eutrophic water recipients,reducing biodiversity losses,and mitigating pollution.展开更多
Developing approaches for precise engineering of the optical response of plasmonic nanocavities at the postfabrication stage is important for achieving enhanced and tunable light-matter interactions.In this work,we de...Developing approaches for precise engineering of the optical response of plasmonic nanocavities at the postfabrication stage is important for achieving enhanced and tunable light-matter interactions.In this work,we demonstrate selective enhancement/suppression of specific plasmonic modes by embedding nanocube-on-mirror plasmonic nanocavities into a poly(methyl methacrylate)(PMMA)layer with a controllable thickness.With the increase of the PMMA thickness from 0 to approximately 100 nm,the dominating out-of-plane plasmonic modes are significantly suppressed in the scattering spectra,while the in-plane plasmonic modes are greatly enhanced with a factor reaching 102±20.This enhancement is related to the variation of momentum matching between the plasmonic modes and the radiative fields,affecting both mode excitation and emission properties.In addition,the spectral positions of the in-plane and out-of-plane plasmonic modes shift up to 52±5 and 81±2 nm,respectively.These properties are important for matching and enhancing plasmonic and molecular resonances in a variety of applications.展开更多
Monodisperse droplet spray dryers have great advantages in particle formation through spray drying because of their ability to produce uniform sized particles. Experimental analyses of this system have shown that drop...Monodisperse droplet spray dryers have great advantages in particle formation through spray drying because of their ability to produce uniform sized particles. Experimental analyses of this system have shown that droplets atomized through the piezoceramic nozzle need to be sufficiently well dispersed before entering the drying chamber to achieve sufficiently dried particles. However, the dispersion dynamics cannot be readily observed because of experimental limitations, and key factors influencing the dispersion state currently remain unclear. This study carried out numerical simulations for droplet dispersions in the dispersion chamber, which allow this important process to be visualized. The system- atic and quantitative analyses on the dispersion states provide valuable data for improving the design of the dispersion chamber, and optimizing the spray drying operation.展开更多
文摘Casing deformation is a widespread problem in a certain block of Jiaoshiba Shale Gas Field in Sichuan Basin,China,and it severely limits the development benefits of shale gas in that block.Based on the spatiotemporal characteristics of block formation,fracture development,and casing deformation occurrence,this paper employs an integrated geological—engineering research approach to identify the primary mechanisms governing casing deformation within the block and proposes countermeasures to prevent such deformation.The present research indicates the following findings:(1)The block has undergone multiple phases of tectonic superposition,with fracture development serving as the geological factor causing casing deformation.(2)Fracturing activation constitutes the engineering factor causing casing deformation,with 4 mm of formation slip inducing deformation.(3)The fracture activation risk map shows that Class Ⅰ and Class Ⅱ fractures account for 73.36%of the total recorded in the block.Within the most susceptible Class I risk zone,the critical activation pressure increment for fracturing operations ranges from 13.43 MPa to 13.99 MPa.Based on the distribution of casing failure risk zones identified in the fracture activation risk map,this paper proposes relevant technical countermeasures for preventing casing failure from three perspectives:shale gas well location deployment,drilling techniques,and fracturing techniques.These measures provide robust support for safeguarding the integrity of casing systems within the studied block.
基金I.A.was supported by the ERC-advanced grant 101098064 e ANAEROB。
文摘While the global waste crisis is intensifying,we are missing a crucial opportunity to address this challenge by embracing a transformative approach:engineered microbial consortia have the potential to revolutionize industrial waste management,reduce greenhouse gas emissions for climate mitigation,and promote a sustainable bioeconomy.Greenhouse gas emissions(GHG)from industrial processes pose a notable threat to planetary health[1].The need for biotechnological solutions specifically targeting CO_(2) capture and recycling for bio-based compounds and energy production is clear but far from achieved[2].There are one trillion microorganisms with a pangenome covering an unspeakable potential of processes.Microbes could provide a solution to many of the challenges our planet is currently facing,such as restoring environmental health,substituting fossil fuels-originating chemicals and products with biomassoriginating ones,enabling regenerative agriculture,restoring eutrophic water recipients,reducing biodiversity losses,and mitigating pollution.
基金National Key Research and Development Program of China(2023YFB2806701)National Natural Science Foundation of China(92250305,62305293)+2 种基金Natural Science Foundation of Zhejiang Province(LR25F050001,LDT23F04015F05)Engineering and Physical Sciences Research Council(EP/W017075/1)New Cornerstone Science Foundation(NCI202216)。
文摘Developing approaches for precise engineering of the optical response of plasmonic nanocavities at the postfabrication stage is important for achieving enhanced and tunable light-matter interactions.In this work,we demonstrate selective enhancement/suppression of specific plasmonic modes by embedding nanocube-on-mirror plasmonic nanocavities into a poly(methyl methacrylate)(PMMA)layer with a controllable thickness.With the increase of the PMMA thickness from 0 to approximately 100 nm,the dominating out-of-plane plasmonic modes are significantly suppressed in the scattering spectra,while the in-plane plasmonic modes are greatly enhanced with a factor reaching 102±20.This enhancement is related to the variation of momentum matching between the plasmonic modes and the radiative fields,affecting both mode excitation and emission properties.In addition,the spectral positions of the in-plane and out-of-plane plasmonic modes shift up to 52±5 and 81±2 nm,respectively.These properties are important for matching and enhancing plasmonic and molecular resonances in a variety of applications.
文摘Monodisperse droplet spray dryers have great advantages in particle formation through spray drying because of their ability to produce uniform sized particles. Experimental analyses of this system have shown that droplets atomized through the piezoceramic nozzle need to be sufficiently well dispersed before entering the drying chamber to achieve sufficiently dried particles. However, the dispersion dynamics cannot be readily observed because of experimental limitations, and key factors influencing the dispersion state currently remain unclear. This study carried out numerical simulations for droplet dispersions in the dispersion chamber, which allow this important process to be visualized. The system- atic and quantitative analyses on the dispersion states provide valuable data for improving the design of the dispersion chamber, and optimizing the spray drying operation.
