Innovative Development of Temporary Plugging Tools for Cased Branch Wells in Offshore OilfieldsXing, Xuesong; Huang, Hui; Zhang, Lei; Bao, Chenyi; Li, Baolong; Shi, Shiying
doi: 10.1088/1742-6596/3095/1/012026pmid: N/A
A novel temporary plugging tool has been developed to address the delayed retrieval of fracturing isolation systems during the completion of casing branch wells in offshore oilfields, where compromised pressure sustainability leads to prolonged tool retention and subsequent operational inefficiencies during completion operations. This study presents the tool’s design principles, structural configuration, and mechanical analysis. The tool’s key parameters, including its size, were determined through static finite element analysis (FEA) of its rupture disc, with a focus on its pressure bearing capacity and crushing load. A functional relationship between rupture disc thickness, rupture pressure, and temperature coefficient was established. Theoretical and experimental results show that the tool can withstand 35 MPa pressure and its rupture disc will fragment into particles smaller than 5×5×5 mm³ under a 12-ton impact load, enabling efficient discharge from the wellbore. These findings satisfy the technical requirements for the completion of cased branch wellbores in offshore oilfields and highlight the tool’s potential for broader application.
Study on the Non-Destructive Detection Response Characteristics of Improved Soil Weakening Process under Coupled Seepage and Stress FieldsHuang, Xiang; Jiang, Yiping; Li, Buli
doi: 10.1088/1742-6596/3095/1/012011pmid: N/A
This study investigates the weakening patterns of 8% cement-mixed improved soil under coupled seepage and stress fields and identifies the non-destructive detection response characteristics of this process. Through prototype experiments, the study determines the resistivity change patterns associated with variations in stress and seepage fields and establishes the resistivity change rates corresponding to soil bearing capacity failure. The key findings are that during the shear failure process, both horizontal and vertical displacements increase, with greater displacements observed under water-immersed conditions. The resistivity shows a phased change pattern, decreasing significantly initially, fluctuating near failure, and increasing sharply after structural failure. The initial resistivity of the improved soil is 26,566 Ω·m, and the resistivity at failure is 2,200 Ω·m, with deviations of less than 5% from the prototype test values. These results provide a reliable basis for non-destructive monitoring of soil stability in practical engineering applications.
Investigation of Drag Reduction by Polymers under Salty Conditions in Microtubes through Surface Response Methodology in Turbulent FlowZhou, Xiangjun; Yang, Yusheng; Zhu, Qingli; Wu, Zhimin; Yuan, Haowen; Kang, Chao
doi: 10.1088/1742-6596/3095/1/012007pmid: N/A
Improving unconventional oil and gas field development efficiency via hydraulic fracturing is crucial for the energy industry and sustainability. However, conventional technologies face inefficiencies and high costs in high salinity environments. This study explores polymer turbulence dampening technology in microtubes under saline conditions to reduce friction and operational costs, promoting environmental friendliness. Using a micro-flow device, drag reduction rates were examined across different flow rates, salt concentrations, and polymer concentrations. Results show that drag reduction generally increases with flow rate but has a complex relationship with salt and polymer concentrations, being typically lower in salt-containing solutions. A regression model developed through surface response methodology (RSM) predicts a maximum drag reduction rate of 44% under optimized conditions. The study also reveals that salt limits polymer activity, affecting drag reduction efficacy. This research enhances hydraulic fracturing efficiency in saline conditions, supporting cost-effectiveness and sustainable practices in the energy sector.
Prediction Method of Fractured Carbonate Reservoirs Based on Diffracted Wave Separation and Seismic AttributesXie, Wei; Sun, Zhentao; Hu, Guanghui; Tang, Jinliang; Zhang, Kefei; Xu, Kai
doi: 10.1088/1742-6596/3095/1/012004pmid: N/A
In Ordovician carbonate reservoirs in the northern Tarim Basin, fracture cavities developed along faults and rivers provide storage spaces for oil and gas. The identification of faults, river channels, and fracture cavities is the key to fracture carbonate reservoirs. The seismic response of the fracture cavities exhibits complex diffraction wave. In conventional seismic data (full wave data), diffracted wave has weak energy and is submerged in strong energy reflected wave, which need to be separated. We propose a prediction method of fractured carbonate reservoirs using diffracted wave separation and seismic attributes. Based on plane wave destructive filter and mean filter, we predict reflected wave and separate diffracted wave from full wave data. The coherence attribute and coherent energy gradient attribute are respectively applied to test the identification ability of faults, river channels, and fracture cavities. The application of field data shows that the proposed method can effectively identify faults, river channels, and fracture cavities. It has reference significance for the actual production of fractured carbonate reservoirs.
Numerical Analysis of the Influence of Material Catalytic Differences and Deformation on the Aerothermal Environment of a Flexible Reentry VehicleShi, Run; Wang, Xinguang; Liu, Qingzong; Ren, ShaoXiong; Kong, Wenhui; Dong, WeiZhong
doi: 10.1088/1742-6596/3095/1/012023pmid: N/A
Inflatable flexible reentry vehicles face intense high-temperature gas non-equilibrium effects during atmospheric reentry, where O2 and N2 in the flowfield undergo significant dissociation and ionization. The wall catalytic effect causes atomic and ionic components to release large compositional diffusion heat fluxes at the surface. Due to structural characteristics, the catalytic differences between the rigid thermal protection base and the flexible surface materials can exacerbate local thermal environments. Additionally, hypersonic flow alters the flexible surface aerodynamic shape, changing its heat flux distribution. This study employs the NNW-HyFLOW software with a two-temperature, 11-component thermo-chemical non-equilibrium model to numerically simulate the aerothermal environment of an inflatable reentry vehicle. The heat flux distributions under different thermal protection materials and deformation shapes are analyzed. Results show: The catalytic differences between the rigid base and flexible surface cause local heat flux change; the larger the catalytic coefficient difference, the more pronounced the change. Among GreyC-9, TABI, and PCC materials, GreyC-9 and TABI exhibit higher surface heat flux values at the material interface regions, with increases of 8.5% and 10.6%, respectively. Surface shape deformation intensifies the thermal environment, shifting peak heat flux locations. Greater deformation leads to more fluctuations in surface heat flux. The sp20 deformed shape results in a peak heat flux of 750 kW/m2, a 68% increase compared to a smooth shape, with a local heat flux difference of 620 kW/m2.
Research on Carbon Emission Accounting Methodology for Surface Engineering of Chemical Flooding in OilfieldsQiao, Ming; Li, Gang; Zhou, Lifeng; Wang, Ning; Dong, Linlin
doi: 10.1088/1742-6596/3095/1/012035pmid: N/A
Chemical flooding is a key enhanced oil recovery (EOR) technique for tertiary oil recovery in mature oilfields. To achieve carbon emission reduction in chemical flooding surface operations, a comprehensive carbon emission accounting framework must be established, and practical emission reduction measures must be proposed. This study takes the chemical flooding surface operations of an oilfield as its research subject. A complete carbon emission accounting method for chemical flooding surface engineering was developed, and the carbon emissions were quantified and analyzed in terms of their composition and proportions. The results indicate that the carbon emission intensity associated with producing one tonne of oil in chemical flooding surface operations was 151.71 kgCO2eq. Notably, indirect carbon emissions account for 90.01% of the total, with electricity consumption contributing 88.57% of these indirect emissions, identifying it as the primary source of carbon emissions in chemical flooding operations. Given the high electricity demand of chemical flooding surface engineering, emission reduction measures are proposed, including the use of high-efficiency equipment and motors, the adoption of multi-unit and low-flow-rate configurations, the optimization of key process parameters, and the integration of renewable energy sources with chemical flooding operations.
Prefacedoi: 10.1088/1742-6596/3095/1/011001pmid: N/A
2025 5th International Conference on Fluid and Chemical Engineering (ICFCE 2025) has been successfully held on July 18-19, 2025, in Wuhan China as a virtual event. Organized by Hubei Zhongke Institute of Geology and Environment Technology, ICFCE 2025 intends to invite worldwide famous scientists, experts, scholars, and researchers for academic presentations.ICFCE 2025 proceeding is a collection of outstanding submissions in the field of biofluid mechanics, chemically reacting fluids and combustion, computational fluid dynamics (CFD), experimental fluid mechanics, flow through porous media, fluid–solid interactions (FSI), geophysical fluid dynamics, granular/suspension flows, heat and mass transfer, hydrodynamics, physical, theoretical and computational chemistry, chemical engineering fundamentals, chemical reaction engineering, chemical engineering equipment design and process design, thermodynamics, catalysis & reaction engineering, particulate systems, crystallization, etc. Around 55 articles were selected from 102 submissions after peer-review, and authors and guests participated in ICFCE 2025 with keynote speeches, oral presentations and posters, promoting the communication among researchers and experts from institutes and universities, including The University of Tokyo, Shiraz University of Technology, University of Bradford, Jiangxi University of Science and Technology, Jiangsu University, Shenyang Aerospace University, etc.Cordial gratitude is delivered to Technical Program Committee of ICFCE 2025 for the professional work on guarantying the high standard of conference as well as the proceedings. We believe the proceedings will enhance the exchange of ideas and state-of-art knowledge on Fluid and Chemical Engineering.List of Technical Committee is available in this PDF.
Modified Bamboo Powder Enhances the Compressive Strength of Paper Rings for Pulp Molded ProductsJia, Zhenglei; Zou, Binghao; Huang, Liwen; Zhang, Jialiang; Wan, Jiqiang; Ma, Xiaohua; Cui, Chun; Wang, Yonghui; Zhang, Hengke; Zhao, Ziyi; Fu, Chenglong; Tian, Haiying; Wang, Haisong
doi: 10.1088/1742-6596/3095/1/012043pmid: N/A
This study systematically investigates the preparation of modified bamboo powder and its application in enhancing the performance of paper and pulp-molded products. Chemical modification improves the dispersion of bamboo powder in paper matrices and strengthens interfacial adhesion with fibers, leading to significant improvements in key physical properties, including tensile strength, ring compressive strength, tear resistance, and burst resistance. The results demonstrate that modified bamboo powder offers not only effective mechanical reinforcement but also environmental and economic advantages. It serves as a viable partial substitute for traditional cationic starch enhancers, presenting a sustainable, low-cost alternative for the paper products industry. Furthermore, this research provides theoretical support for the high-value utilization of bamboo-based biomass in papermaking and molding, and contributes to the expansion of the bamboo industry chain and the green transformation of the wood processing sector.
Mechanical Response Analysis of Low-Temperature Modified Asphalt Pavement Based on Finite Element Simulation ModelsLi, Chuncai; Li, Qinghao; Zhang, Suigang; Xu, Baojian; Qi, Mei-li; Tan, Xuxiang; Gao, Hongkai; Zhu, Jinsen; Zhao, Liandi
doi: 10.1088/1742-6596/3095/1/012020pmid: N/A
An asphalt pavement model was established using ABAQUS finite element simulation software. Based on the dynamic modulus of low-temperature modified asphalt mixtures, mechanical response analyses were performed on pavement models with different surface course materials. The influence patterns of low-temperature modified asphalt mixture surface courses on the tensile strain at the bottom of the asphalt layer, surface vertical displacement, and tensile stress at the bottom of the base course were investigated. The optimal combination was determined to be an upper surface course of AC-13 USP-SBS asphalt mixture and a lower surface course of AC-20 SBS asphalt mixture.
The Influence of Dual Lateral Jets on Flow Characteristics in the ConduitWang, Qin; Wang, Meng; Feng, Yuchen; Zhu, Jianyong
doi: 10.1088/1742-6596/3095/1/012024pmid: N/A
To investigate the effects of employing dual transverse jets on the jet outlet in jet pre-cooling technology, a study was conducted on how different nozzle arrangements and jet parameters influence the heat transfer characteristics within the flow channel. The jet flow channel was simplified, and a mathematical model was established to calculate the pre-cooling spray characteristics between the dual nozzles inside the jet flow channel. Using this model, the pre-cooling effect was simulated and tested. The results indicate that a minimal nozzle spacing leads to excessively high temperatures in the central region, while overly large spacing increases pressure losses and weakens turbulence intensity. An optimal intermediate nozzle spacing significantly reduces the overall temperature within the flow channel and promotes a uniform temperature distribution. Additionally, increasing the offset distance between nozzles decreases the temperature gradient but results in a decline in local heat transfer efficiency.