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Optimization of integrated geological-engineering design of volume fracturing with fan-shaped well pattern
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作者 TANG Jizhou WANG Xiaohua +2 位作者 DU Xianfei MA Bing ZHANG Fengshou 《Petroleum Exploration and Development》 SCIE 2023年第4期971-978,共8页
According to the variable toe-to-heel well spacing, combined with the dislocation theory, discrete lattice method, and finite-element-method(FEM) based fluid-solid coupling, an integrated geological-engineering method... According to the variable toe-to-heel well spacing, combined with the dislocation theory, discrete lattice method, and finite-element-method(FEM) based fluid-solid coupling, an integrated geological-engineering method of volume fracturing for fan-shaped well pattern is proposed considering the geomechanical modeling, induced stress calculation, hydraulic fracturing simulation, and post-frac productivity evaluation. Besides, we propose the differential fracturing design for the conventional productivity-area and the potential production area for fan-shaped horizontal wells. After the fracturing of the conventional production area for H1 fan-shaped well platform, the research shows that the maximum reduction of the horizontal principal stress difference in the potential productivity-area is 0.2 MPa, which cannot cause the stress reversal, but this reduction is still conducive to the lateral propagation of hydraulic fractures. According to the optimized fracturing design, in zone-Ⅰ of the potential production area, only Well 2 is fractured, with a cluster spacing of 30 m and an injection rate of 12 m^(3)/min per stage;in zone-Ⅱ, Well 2 is fractured before Well 3, with a cluster spacing of 30 m and an injection rate of 12 m^(3)/min per stage. The swept area of the pore pressure drop in the potential production area is small, showing that the reservoir is not well developed. The hydraulic fracturing in the toe area can be improved by, for example, properly densifying the fractures and adjusting the fracture distribution, in order to enhance the swept volume and increase the reservoir utilization. 展开更多
关键词 shale oil fan-shaped well pattern horizontal well geological model hydraulic fracturing productivity evaluation integrated geological-engineering design
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Data mining optimization of laidback fan-shaped hole to improve film cooling performance 被引量:2
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作者 WANG Chun-hua ZHANG Jing-zhou ZHOU Jun-hui 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第5期1183-1189,共7页
To improve the cooling performance, shape optimization of a laidback fan-shaped film cooling hole was performed. Three geometric parameters, including hole length, lateral expansion angle and forward expansion angle, ... To improve the cooling performance, shape optimization of a laidback fan-shaped film cooling hole was performed. Three geometric parameters, including hole length, lateral expansion angle and forward expansion angle, were selected as the design parameters. Numerical model of the film cooling system was established, validated, and used to generate 32 groups of training samples. Least square support vector machine(LS-SVM) was applied for surrogate model, and the optimal design parameters were determined by a kind of chaotic optimization algorithm. As hole length, lateral expansion angle and forward expansion angle are 90 mm, 20° and 5°, the area-averaged film cooling effectiveness can reach its maximum value in the design space. LS-SVM coupled with chaotic optimization algorithm is a promising scheme for the optimization of shaped film cooling holes. 展开更多
关键词 gas TURBINE laidback fan-shaped film COOLING HOLES OPTIMIZATION support vector machine (SVM) CHAOTIC OPTIMIZATION algorithm
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Underwater persistent bubble-assisted femtosecond laser ablation for hierarchical micro/nanostructuring 被引量:12
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作者 Dongshi Zhang Bikas Ranjan +1 位作者 Takuo Tanaka Koji Sugioka 《International Journal of Extreme Manufacturing》 2020年第1期135-154,共20页
In this study,we demonstrate a technique termed underwater persistent bubble assisted femtosecond laser ablation in liquids(UPB-fs-LAL)that can greatly expand the boundaries of surface micro/nanostructuring through la... In this study,we demonstrate a technique termed underwater persistent bubble assisted femtosecond laser ablation in liquids(UPB-fs-LAL)that can greatly expand the boundaries of surface micro/nanostructuring through laser ablation because of its capability to create concentric circular macrostructures with millimeter-scale tails on silicon substrates.Long-tailed macrostructures are composed of layered fan-shaped(central angles of 45°–141°)hierarchical micro/nanostructures,which are produced by fan-shaped beams refracted at the mobile bubble interface(.50°light tilt,referred to as the vertical incident direction)during UPB-fs-LAL line-by-line scanning.Marangoni flow generated during UPB-fs-LAL induces bubble movements.Fast scanning(e.g.1mms−1)allows a long bubble movement(as long as 2mm),while slow scanning(e.g.0.1mms−1)prevents bubble movements.When persistent bubbles grow considerably(e.g.hundreds of microns in diameter)due to incubation effects,they become sticky and can cause both gas-phase and liquidphase laser ablation in the central and peripheral regions of the persistent bubbles.This generates low/high/ultrahigh spatial frequency laser-induced periodic surface structures(LSFLs/HSFLs/UHSFLs)with periods of 550–900,100–200,40–100 nm,which produce complex hierarchical surface structures.A period of 40 nm,less than 1/25th of the laser wavelength(1030 nm),is the finest laser-induced periodic surface structures(LIPSS)ever created on silicon.The NIR-MIR reflectance/transmittance of fan-shaped hierarchical structures obtained by UPB-fs-LAL at a small line interval(5μm versus 10μm)is extremely low,due to both their extremely high light trapping capacity and absorbance characteristics,which are results of the structures’additional layers and much finer HSFLs.In the absence of persistent bubbles,only grooves covered with HSFLs with periods larger than 100 nm are produced,illustrating the unique attenuation abilities of laser properties(e.g.repetition rate,energy,incident angle,etc)by persistent bubbles with different curvatures.This research represents a straightforward and cost-effective approach to diversifying the achievable hierarchical micro/nanostructures for a multitude of applications. 展开更多
关键词 hierarchical micro/nanostructures persistent bubble femtosecond laser surface structuring beam refraction fan-shaped microstructure LIPSS
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Design of the Control System of Adaptive Balancing Device Based on PLC 被引量:5
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作者 Sha Zhu Yuexiang Li +1 位作者 Yu Wang Yonghui Wang 《Intelligent Control and Automation》 2015年第3期200-204,共5页
Due to the well condition and the un-expected imbalance movement of the pumping unit in use, the energy consumes a lot. The existing balancing equipment cannot adjust and monitor the pumping units in real time. Theref... Due to the well condition and the un-expected imbalance movement of the pumping unit in use, the energy consumes a lot. The existing balancing equipment cannot adjust and monitor the pumping units in real time. Therefore this paper introduces the new adaptive balancing equipment—fan-shaped adaptive balancing intelligent device, projects a design of such control system based on PLC, and determines the principle of the control system, the execution software and the design flow. Site commissioning effect on Daqing Oilfield shows this fan-shaped adaptive balancing intelligent device can effectively adjust and monitor the pumping unit in real time, the balance even adjusts from 0.787 to 0.901, and integrated energy saving rate is 14.2%. It is approved that this control device is professionally designed, with strong compatibility, and high reliability. 展开更多
关键词 PUMPING Unit fan-shaped ADAPTIVE Balancing Intelligent DEVICE BALANCE Adjustment Energy SAVING PLC Remote Control
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Novel Optical Multichannel Detector for Laser Diffraction Particle Size Analyzer
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作者 HUANG Youshu,ZHU Wei’an (Dept. of Optoelectron.Inform.,Chongqing University, Chongqing 400044,CHN) 《Semiconductor Photonics and Technology》 CAS 1998年第4期225-230,234,共7页
The novel fan-shaped self-scanning photodiode array (SSPA) has the advantages of the high sensitivity with small device size and the serial video output mode. Using novel SSPA instead of the photodiode array of a semi... The novel fan-shaped self-scanning photodiode array (SSPA) has the advantages of the high sensitivity with small device size and the serial video output mode. Using novel SSPA instead of the photodiode array of a semicircular annular detectors in the laser diffraction particle size analyzer, these correctness of the results are verified by various particle samples measuring and the practical running over ten thousand hours in the desulphuration tower. 展开更多
关键词 fan-shaped Photoelectric Array Grain Size Analyzers PHOTODETECTOR
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Hybrid RANS-LES of Shaped Hole Film Cooling on an Adiabatic Flat Plate at Low Reynolds Number
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作者 Michael Boehler Akshay Sudesh Mark Turner 《Open Journal of Fluid Dynamics》 2020年第4期317-341,共25页
Hybrid RANS-LES methods offer a means of reducing computational cost and setup time to simulate transitional flows. Several methods are evaluated in ANSYS CFX, including Scale-Adaptive Simulation (SAS), Shielded Detac... Hybrid RANS-LES methods offer a means of reducing computational cost and setup time to simulate transitional flows. Several methods are evaluated in ANSYS CFX, including Scale-Adaptive Simulation (SAS), Shielded Detached Eddy Simulation (SDES), Stress-Blended Eddy Simulation (SBES), and Zonal Large Eddy Simulation (ZLES), along with a no-model laminar simulation. Each is used to simulate an adiabatic flat plate film cooling experiment of a shaped hole at low Reynolds number. Adiabatic effectiveness is calculated for Blowing Ratio (BR) = 1.5 and Density Ratio (DR) = 1.5. The ZLES method and laminar simulation most accurately match experimental lateral-average adiabatic effectiveness along the streamwise direction from the trailing edge of the hole to 35 hole diameters downstream of the hole (X/D = 0 to X/D = 35), with RMS deviations of 5.1% and 4.2%, and maximum deviations of 8% and 11%, respectively. The accuracy of these models is attributed to the resolution of turbulent structures in not only the mixing region but in the upstream boundary layer as well, where the other methods utilize RANS and do not switch to LES. 展开更多
关键词 Film Cooling Large Eddy Simulation Detached-Eddy Simulation Stress-Blended Eddy Simulation Laidback fan-shaped Cooling Hole Film Cooling Effectiveness
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Leading Edge Film Cooling Enhancement for an Inlet Guide Vane with Fan-Shaped Holes 被引量:4
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作者 Jian-Jun LIU, Bai-Tao AN, Jie LIU and Zhan W Institute of Engineering Thermophysics, Chinese Academy of Sciences, P. O. Box 2706, Beijing 100190, China Professor,PhD 《Journal of Thermal Science》 SCIE EI CAS CSCD 2010年第6期514-518,共5页
This paper describes the improvement of leading edge film cooling effectiveness for a turbine inlet guide vane by using fan-shaped film cooling holes. The modification details are presented in comparison with the base... This paper describes the improvement of leading edge film cooling effectiveness for a turbine inlet guide vane by using fan-shaped film cooling holes. The modification details are presented in comparison with the base-line configuration of cylindrical holes. Numerical simulations were carried out for the base-line and modified configurations by using CFX, in which the k-ε turbulence model and scalable wall function were chosen. Contours of adiabatic film cooling effectiveness on the blade surfaces and span-wise distributions of film cooling effectiveness downstream the rows of cooling holes interested for the different cooling configurations were compared and discussed. It is showed that with the use of fan-shaped cooling holes around the leading edge, the adiabatic film cooling effectiveness can be enhanced considerably. In comparison with the cylindrical film cooling holes, up to 40% coolant mass flow can be saved by using fan-shaped cooling holes to obtain the comparable film cooling effectiveness for the studied inlet guide vane. 展开更多
关键词 Inlet Guide Vane Film Cooling Effectiveness fan-shaped Hole Leading Edge
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In situ Formed Fan-Shaped Nanowires in Biomorphic SiO2:A Multidimensional Composite of Hierarchical Porous Material and Organic Pollutant Adsorption Behavior
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作者 Hui Chen Lei Zhao +4 位作者 Xuan He Guang-Hui Wang Xi-Tang Wang Wei Fang Xing Du 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2017年第2期104-112,共9页
Fan-shaped SiO2 nanowires modified SiO2@C composites with a bio-inspired hierarchical porous structure and a high accessible surface area were prepared by in situ molten salt template method.The combination of biogeni... Fan-shaped SiO2 nanowires modified SiO2@C composites with a bio-inspired hierarchical porous structure and a high accessible surface area were prepared by in situ molten salt template method.The combination of biogenic hierarchical porous structure and one-dimensional nanostructure with similar features was successfully obtained by one-pot heat treatment in the presence of rice husk SiO2 with SiO2 acting as precursor and ZnCl2 acting as molten salt and growth template.A large amount of fan-shaped SiO2 nanowires with numerous tiny branches sprouting from the central nanowires were grown in the inter-porous epidermis and on the surface of rice husk SiO2 for temperatures up to 1200 ℃.The in situ ZnCl2 molten salt template base-growth mechanism is responsible for the initial formation of SiO2/ZnCl2 co-melting nanowires and the subsequent growth of fan-shaped SiO2 nanowires.The as-prepared samples have been successfully employed as organic absorbers with high efficiency in the field of wastewater treatment. 展开更多
关键词 Agricultural waste fan-shaped SiO2 nanowires Rice husk Biomorphic porous SiO2 Waste water
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Zero-Divisor Semigroups of Fan-Shaped Graph
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作者 Ke ZHOU Hua Dong SU 《Journal of Mathematical Research and Exposition》 CSCD 2011年第5期923-929,共7页
Let Pn be a path graph with n vertices, and let Fn = Pn ∪ {c}, where c is adjacent to all vertices of Pn. The resulting graph is called a fan-shaped graph. The corresponding zero-divisor semigroups have been complete... Let Pn be a path graph with n vertices, and let Fn = Pn ∪ {c}, where c is adjacent to all vertices of Pn. The resulting graph is called a fan-shaped graph. The corresponding zero-divisor semigroups have been completely determined by Tang et al. for n = 2, 3, 4 and by Wu et al. for n ≥ 6, respectively. In this paper, we study the case for n = 5, and give all the corresponding zero-divisor semigroups of Fn. 展开更多
关键词 commutative zero-divisor semigroup refinements of a star graph fan-shaped graph center.
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Synthesis of water-soluble dye-cored poly(amidoamine) dendrimers for long-term live cell imaging
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作者 Yang Cai Chendong Ji +2 位作者 Shaobo Zhang Zhiqiang Su Meizhen Yin 《Science China Materials》 SCIE EI CSCD 2018年第11期1475-1483,共9页
Hydrophilic dendrimers, especially poly(amidoamine)(PAMAM) dendrimers are widely applied in modifying fluorescent dyes to endow them with water solubility and biocompatibility for biologic fluorescence imaging.Com... Hydrophilic dendrimers, especially poly(amidoamine)(PAMAM) dendrimers are widely applied in modifying fluorescent dyes to endow them with water solubility and biocompatibility for biologic fluorescence imaging.Common preparation strategies of fluorescent dendrimers including encapsulating dyes or attaching dyes at periphery of dendrimers might cause uncertain constituent and lower biocompatibility. Here, we have developed a series of watersoluble fluorescent dendrimers with dye as core and fanshaped PAMAM as arms. Carboxylated perylene bisimides(PBI) dye and squarylium indocyanine(SICy) dye were conjugated with PAMAM dendrons by amidation to obtain a series of fluorescent dendrimers with enhanced water-solubility. Two PBI based dendrimers(PBI-G2.5 and PBI-G1.5)were chosen as model compounds for further optical, selfassembly and biological studies. In aqueous environment,PBI-G2.5 exhibited strong fluorescence, small size(~30 nm)and slightly positive surface charge(~2.46 mV), which are ideal for biomedical applications. In vitro assays demonstrated that PBI-G2.5 nanoparticles accumulated in the cytoplasm of He La cells with rapid cellular uptake. The strong fluorescence in He La cells remained for over 48 h. To conclude, our study provides an effective strategy for preparing water-soluble fluorescent dendrimers towards long-term live cell imaging. 展开更多
关键词 fluorescent dendrimers fan-shaped PAMAM perylene bisimides water solubility live cell imaging
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