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A developed transient gas-liquid-solid flow model with hydrate phase transition for solid fluidization exploitation of marine natural gas hydrate reservoirs

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Petroleum Science 2023年第3期20卷 1676-1689页

作者： Geng Zhang Jun Li Gong-Hui Liu hong-wei yang Chao Wang hong-Lin Huang China University of Petroleum-Beijing Bejing102249China China University of Petroleum-Bejing at Karamay Karamay834000XinjiangChina

The multiphase flow characteristic is one of the most concerning problems during solid fluidization exploitation of marine natural gas hydrate *** this research,a new transient gas-liquid-solid multiphase flow model with hydrate phase transition was ***,this model considered the coupling relationship among convective heat transfer,hydrate dynamic decomposition,and multi-phase *** model can simulate the change of flow pattern from solid-liquid to gas-liquid-solid flow,and describe the distribution character of volume fraction of phase,wellbore temperature and pressure,and hydrate decomposition rate during *** simulation results indicate that the hydrate decomposition region in the wellbore gradually expands,but the hydrate decomposition rate gradually decreases during the solid fluidization exploitation of *** mining time lasts for 4 h,and the bottom hole pressure decreases by about 0.4 *** NaCl concentration in seawater helps expand hydrate decomposition regions and improves the wellbore hydrate decomposition *** the Nacl mass fraction in seawater reaches 15%,it will raise the hydrate decomposition regions to the whole *** addition,the higher the wellhead backpressure,the lower the decomposition area and decomposition rate of hydrate in the *** wellhead backpressure reaches 2 MPa,the volume fraction of gas near the wellhead will reduce to about 12%.This work is expected to provide a theoretical basis for the development of marine hydrate reservoirs.

关键词： Gas-liquid-solid multiphase flow Solid fluidization Hydrate dynamic decomposition Convective heat transfer

Backlund transformation,infinite number of conservation laws and fission properties of an integro-differential model for ocean internal solitary waves

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Communications in Theoretical Physics 2021年第3期73卷 36-42页

作者： Di Yu Zong-Guo Zhang Huan-He Dong hong-wei yang College of Mathematics and System Science Shandong University of Science and TechnologyQingdao 266590China School of Mathematics and Statistics Qilu University of Technology(Shandong Academy of Sciences)Jinan250353China

This paper presents an analytical investigation of the propagation of internal solitary waves in the ocean of finite *** the multi-scale analysis and reduced perturbation methods,the integro-differential equation is derived,which is called the intermediate long wave(ILW)equation and can describe the amplitude of internal solitary *** can reduce to the Benjamin-Ono equation in the deep-water limit,and to the KdV equation in the shallow-water *** attention has been paid to the features of integro-differential equations,especially for their conservation ***,based on Hirota bilinear method,Backlund transformations in bilinear form of ILW equation are derived and infinite number of conservation laws are ***,we analyze the fission phenomenon of internal solitary waves theoretically and verify it through numerical *** of these have potential value for the further research on ocean internal solitary waves.

关键词： infinite conservation laws the integro-differential equation internal solitary waves fission properties of waves

Effects of solar radiation pressure on asteroid surface hopping transfers for high area/mass ratio rovers

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Research in Astronomy and Astrophysics 2021年第6期21卷 337-348页

作者： Chuan-Jun Dong hong-wei yang Shuang Li Xue-Wen Liu College of Astronautics Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The high area/mass ratio hopping rovers have potential applications in future asteroid surface *** paper systematically investigates the effects of solar radiation pressure(SRP)on ballistic surface hopping transfers for the asteroid 101955 *** of SRP on the traveled distance and the trajectory design of hopping transfers are analyzed and *** simulation results indicate that it is necessary to take SRP into account to ensure the success of hopping transfers and the proper use of SRP can help design the trajectories of hopping transfers with low initial impulses and short transfer *** also reveals the potential possibility in using SRP to control the post-hopping transfers with specific control policies in the future surface exploration of asteroids.

关键词： asteroid hopping solar radiation pressure dynamics trajectory

The (3+1)-dimensional generalized mKdV-ZK equation for ion-acoustic waves in quantum plasmas as well as its non-resonant multiwave solution

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Chinese Physics B 2020年第12期29卷 329-339页

作者： Xiang-Wen Cheng Zong-Guo Zhang hong-wei yang College of Mathematics and Systems Science Shandong University of Science and TechnologyQingdao 266590China School of Mathematics and Statistics Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China

The quantum hydrodynamic model for ion-acoustic waves in plasmas is ***,we design a new disturbance expansion to describe the ion fluid velocity and electric field *** should be emphasized that the piecewise function perturbation form is new with great difference from the previous ***,based on the piecewise function perturbation,a(3+1)-dimensional generalized modified Korteweg–de Vries Zakharov–Kuznetsov(mKdV-ZK)equation is derived for the first time,which is an extended form of the classical mKdV equation and the ZK ***(3+1)-dimensional generalized time-space fractional mKdV-ZK equation is constructed using the semi-inverse method and the fractional variational ***,it is more accurate to depict some complex plasma processes and ***,the conservation laws of the generalized time-space fractional mKdV-ZK equation are ***,using the multi-exponential function method,the non-resonant multiwave solutions are constructed,and the characteristics of ion-acoustic waves are well described.

关键词： ion-acoustic waves piecewise function perturbation (3+1)-dimensional generalized time-space fractional mKdV-ZK equation non-resonant multiwave solution

Saposhnikoviae divaricata:a phytochemical,pharmacological,and pharmacokinetic review

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Chinese Journal of Natural Medicines 2017年第4期15卷 255-264页

作者： Jenny Kreiner Edwin Pang George Binh Lenon Angela wei hong yang School of Health and Biomedical Sciences RMIT UniversityVictoria 3001Australia School of Science RMIT UniversityVictoria 3001Australia

Saposhnikoviae divaricata(Turcz.) Schischk(SD) is a traditional Chinese herb commonly used to treat clinical conditions such as rheumatism and allergic rhinitis. This review article evaluates a collection of works on in vitro and biochemical studies of SD. The discourse on the diverse class of chromones and coumarins in SD offers an insight to the pharmacological effects of these bioactive constituents as anti-inflammatory, analgesic, immunoregulatory, antioxidative, and anti-proliferative agents. It is highlighted that there is a structural relationship between the constituents and bioactive activities, which in effect provides a valid reasoning and reaffirm the use of SD in the treatment of the pathologies in Chinese medicine.

关键词： Saposhnikoviae divaricata Chinese herbal medicine Anti-inflammatory Analgesic Immunomodulatory Anti-proliferative

A dynamic managed pressure well-control method for rapid treatment of gas kick in deepwater managed pressure drilling

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Petroleum Science 2022年第5期19卷 2297-2313页

作者： hong-wei yang Jun Li Ji-wei Jiang Hui Zhang Bo-Yun Guo Geng Zhang Wang Chen China University of Petroleum-Beijing Beijing102249China China University of Petroleum-Beijing at Karamay Karamay834000XinjiangChina CNPC Engineering Technology R&D Company Limited Beijing102206China University of Louisiana at Lafayette LafayetteLA70504USA

During deepwater managed pressure drilling(MPD),the gas kick may occur in abnormally high-pressure *** the traditional well control method is adopted,the treatment time is long and the advantage of early gas kick detection of MPD is *** dynamic managed pressure well-control(MPWC)method can be used to rapidly treat gas kick in deepwater *** this paper,considering the effect of large-variable-diameter annulus and complex wellbore temperature in deepwater drilling,a simplified model of non-isothermal gas-liquid two-phase flow was established for dynamic deepwater MPWC *** this model,the response characteristics of outlet flow and wellhead backpressure were *** results indicated that the gas fraction,outlet liquid flow rate,pit gain and wellhead backpressure presented complex alternating characteristics when gas moved upwards in the wellbore due to the large-variable-diameter *** outlet liquid flow rate would be lower than the inlet flow rate and the pit gain would decrease before the gas moved to the *** variation trend of the wellhead backpressure was consistent with that of the pit *** the gas-liquid mixture passed through the choke,the expansion or compression of the gas caused part of the choke pressure drop to be supplemented or unloaded,delaying the response rate of the wellhead *** wellbore temperature,borehole diameter and seawater depth had different effects on outlet flow rate,pit gain and wellhead *** research could provide a new idea for well control methods in deepwater managed pressure drilling.

关键词： Gas kick Managed pressure well-control Gas-liquid two-phase flow Wellhead backpressure Outlet flow characteristics Deepwater managed pressure drilling

Dust acoustic rogue waves of fractional-order model in dusty plasma

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Communications in Theoretical Physics 2020年第12期72卷 1-17页

作者： Jun-Chao Sun Zong-Guo Zhang Huan-He Dong hong-wei yang College of Mathematics and System Science Shandong University of Science and TechnologyQingdao 266590China School of Mathematics Statistics Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China

In this paper,the fractional-order model is used to study dust acoustic rogue waves in dusty ***,based on control equations,the multi-scale analysis and reduced perturbation method are used to derive the(3+1)-dimensional modified Kadomtsev–Petviashvili(MKP)***,using the semi-inverse method and the fractional variation principle,the(3+1)-dimensional time-fractional modified Kadomtsev–Petviashvili(TF-MKP)equation is ***,the Riemann–Liouville fractional derivative is used to study the symmetric property and conservation laws of the(3+1)-dimensional TF-MKP ***,the exact solution of the(3+1)-dimensional TF-MKP equation is obtained by using fractional order transformations and the definition and properties of Bell *** on the obtained solution,we analyze and discuss dust acoustic rogue waves in dusty plasma.

关键词： time-fractional modified Kadomtsev–Petviashvili equation conservation laws dust acoustic rogue waves

The integration of dinitropyrazole and 1,3,4-oxadiazole:A novel hybrid heterocyclic skeleton for balancing energy and stability

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Defence Technology（防务技术） 2023年第6期24卷 122-128页

作者： Xiao-xiao Zheng Ting-ou Yan Lei Qian hong-wei yang Guang-bin Cheng School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyNanjing210094China

In this study,a new energetic hybrid skeleton was constructed through the integration of nitropyrazole and 1,3,4-oxadiazole skeletons in a ***,the energetic precursor(2),the azo-bridged compound(3),the neutral nitramine(4)and the corresponding energetic salts(5-7)were *** physicochemical and energetic properties we re experimentally and theo retically *** the developed compounds,the azo-bridged compound(3)and dihydroxylammoinium(6)display high detonation performances(3,D_(v)=8904 m/s,P=34.47 GPa;6,D_(v)=9025 m/s,P=34.66 GPa),moderate sensitivities(3,IS=16 J,FS=120 N;6,IS=20 J,FS=312 N)and good densities(3,1.87 g/cm^(3);6,1.81 g/cm^(3)),which indicates that they have the potential to replace the traditional high-energy explosive *** results show that the integration of different energetic skeletons can achieve a good balance between energy and sensitivity.

关键词： Heterocycle Azo-bridged Hybrid skeletons Energetic materials

Experimental study of the critical sand starting velocity of gas-watersand flow in an inclined pipe

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Petroleum Science 2022年第6期19卷 2981-2994页

作者： Rui-Yao Zhang Jun Li hong-wei yang Geng Zhang Xi-Ning Hao Peng-Lin Liu School of Petroleum Engineering China University of Petroleum(Beijing)Beijing102200China School of Petroleum Engineering China University of Petroleum(Beijing)Karamay834000XinjiangChina CNOOC Research Institute Co.Ltd. Beijing100028China

The purpose of this paper is to study the critical sand starting velocity and transformation law of flow pattern based on gas-water-sand three-phase flow in an inclined ***,the indoor simulation experiment system of gas-water-sand three-phase flow was used to test the conversion law of flow pattern based upon the different gas void ***,the influence of slug bubbles on sand migration was investigated according to distinctive hole deviation angles,gas void fraction and sand ***,the critical sand starting velocity was tested based on dissimilar hole deviation angles,gas void fraction,sand concentration and sand particle size,and then the influence of the abovementioned key parameters on the sand starting velocity was debated based on the force analysis of the sand *** experimental results illustrated that when the gas void fraction was less than 5%,it was bubbly *** it increased from 5%to 30%,the bubbly flow and slug flow *** it was between 30%and 50%,the slug flow and agitated flow *** it reached 50%,it was agitated *** that the hole deviation angle was 90°,the phenomenon of overall migration and wavelike migration on the surface of sand bed was *** the contrary,the phenomenon of rolling and jumping migration was *** critical sand starting velocity was positively correlated with the hole deviation angle and sand particle size,but negatively associated with the gas void fraction and sand *** research can provide a certain reference for sand-starting production in the field of petroleum engineering.

关键词： Three-phase flow Critical sand starting velocity Flow pattern Sand migration Gas void fraction Hole deviation angles Sand concentration