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| 1 | Annular multiphase flow behavior during deep water drilling and the effect of hydrate phase transition显示文摘It is very important to understand the annular multiphase flow behavior and the effect of hydrate phase transition during deep water drilling.The basic hydrodynamic models,including mass,momentum,and energy conservation equations,were established for annular flow with gas hydrate phase transition during gas kick.The behavior of annular multiphase flow with hydrate phase transition was investigated by analyzing the hydrate-forming region,the gas fraction in the fluid flowing in the annulus,pit gain,bottom hole pressure,and shut-in casing pressure.The simulation shows that it is possible to move the hydrate-forming region away from sefloor by increasing the circulation rate.The decrease in gas volume fraction in the annulus due to hydrate formation reduces pit gain,which can delay the detection of well kick and increase the risk of hydrate plugging in lines.Caution is needed when a well is monitored for gas kick at a relatively low gas production rate,because the possibility of hydrate presence is much greater than that at a relatively high production rate.The shut-in casing pressure cannot reflect the gas kick due to hydrate formation,which increases with time. | Wang Zhiyuan Sun Baojiang | 2009 | Petroleum Science2009，6，1： | 17 |
| 2 | A prediction method of natural gas hydrate formation in deepwater gas well and its application显示文摘To prevent the deposition of natural gas hydrate in deepwater gas well,the hydrate formation area in wellbore must be predicted.Herein,by comparing four prediction methods of temperature in pipe with field data and comparing five prediction methods of hydrate formation with experiment data,a method based on OLGA&PVTsim for predicting the hydrate formation area in wellbore was proposed.Meanwhile,The hydrate formation under the conditions of steady production,throttling and shut-in was predicted by using this method based on a well data in the South China Sea.The results indicate that the hydrate formation area decreases with the increase of gas production,inhibitor concentrations and the thickness of insulation materials and increases with the increase of thermal conductivity of insulation materials and shutdown time.Throttling effect causes a plunge in temperature and pressure in wellbore,thus leading to an increase of hydrate formation area. | Yanli Guo Baojiang Sun Keke Zhao Hongkun Zhang | 2016 | Petroleum2016，2，3： | 5 |
| 3 | Experimental characterization of guest molecular occupancy in clathrate hydrate cages: A review显示文摘Study on the microscopic structure of clathrate hydrate has made significant progress in the past decades.This review aims to summarize the state of the art of the experimental characterization of guest molecular occupancy in clathrate hydrate cages,which is an important area of the microscopic structures.The characterizing method and features of different guest molecular,such as hydrocarbon,carbon dioxide,hydrogen and inhibitor/promoter,in different hydrate cages have been extensively reviewed.A comprehensive use of advanced technologies such as X-ray diffraction,Raman spectroscopy and nuclear magnetic resonance may provide better understanding on the compositions and microscopic mechanisms of clathrate hydrate. | Changhong Yu Litao Chen Baojiang Sun | 2019 | Chinese Journal of Chemical Engineering2019，27，9： | 4 |
| 4 | Experiment investigation on spontaneous combustion of iron sulfides in oil tank显示文摘 | WANG Wenhe XU Zhisheng SUN Baojiang | 2013 | Advanced Materials Research2013，，： | 1 |
| 5 | The mechanism for the formation of slug flow in vertical gas-liquid two-phase flow显示文摘 | Sun Baojiang Wang Ruihe Zhao Xinxin | 2002 | Solid-State Electronics2002，46，12： | 1 |
| 6 | Deepwater gas kick simulation with considering of the gas hydrate phase transition显示文摘 | Wang Zhiyuan Sun Baojiang | 2014 | Journal of Hydronamics2014，26，1： | 1 |
| 7 | Wellbore drift flow relation suitable for full flow pattern domain and full dip range显示文摘Aiming at the simulation of multi-phase flow in the wellbore during the processes of gas kick and well killing of complex-structure wells(e.g.,directional wells,extended reach wells,etc.),a database including 3561 groups of experimental data from 32 different data sources is established.Considering the effects of fluid viscosity,pipe size,interfacial tension,fluid density,pipe inclination and other factors on multi-phase flow parameters,a new gas-liquid two-phase drift flow relation suitable for the full flow pattern and full dip range is established.The distribution coefficient and gas drift velocity models with a pipe inclination range of-90°–90°are established by means of theoretical analysis and data-driven.Compared with three existing models,the proposed models have the highest prediction accuracy and most stable performance.Using a well killing case with the backpressure method in the field,the applicability of the proposed model under the flow conditions with a pipe inclination range of-90°–80°is verified.The errors of the calculated shut in casing pressure,initial back casing pressure and casing pressure when adjusting the displacement are 2.58%,3.43%,5.35%,respectively.The calculated results of the model are in good agreement with the field backpressure data. | LOU Wenqiang WANG Zhiyuan LI Pengfei SUN Xiaohui SUN Baojiang LIU Yaxin SUN Dalin | 2022 | Petroleum Exploration and Development2022，49，3： | 1 |
| 8 | Property evaluation of CO2 adsorption and desorption on shale 显示文摘 | SUN Baojiang ZHANG Yanlong DU Qingjie | 2013 | Journal of China University of Petroleum (E- dition of Natural Science)2013，37，5： | 1 |
| 9 | Fully conversing and highly selective oxidation of benzene to phenol based on MOFs-derived CuO@CN photocatalyst显示文摘Developing highly efficient photocatalysts for selective oxidation of benzene to phenol is of great significance. However, it is still challenging to simultaneously achieve high conversion rate and selectivity.Herein, we demonstrate 99.9% of benzene photoconversion and 99.1% of phenol selectivity under the illumination of AM 1.5 for 12 h. For this purpose, an advanced CuO@CN photocatalyst has been fabricated by loading tubular carbon nitride(CN) with CuO nanoparticles thermally polymerized from Cu-based metal-organic frameworks(MOFs). The sluggish photocharge carrier recombination rate and the excellent stability indicate that the as-prepared nanocomposite is an ideal photocatalyst for benzene oxidation application. This work paves a new avenue for designing novel photocatalyst based on MOFs and carbon nitride materials. | Longjiang Sun Dongxu Wang Yuxin Li Baogang Wu Qi Li Cheng Wang Shuao Wang Baojiang Jiang | 2023 | Chinese Chemical Letters2023，34，4： | 1 |
| 10 | Distribution laws and effects analysis of casing external pressure taking elastic parameters matching into account显示文摘Distribution laws of casing external pressure,which are obtained by different scholars in different conditions,are not the same.Thus,a model to calculate the external pressure of casing is established with finite element method.In the model a contact is built between the outer wall of the casing and the inner wall of the cement sheath.The casing external pressure can be got through extracting contact force of results.The numerical results and analysis show that:The largest casing external pressure exists in the direction of minimum horizontal stress of formation rather than in the direction of the maximum horizontal stress.There exists such matching between the cement sheath elastic modulus and formation elastic modulus:When the elastic modulus of the cement sheath is small,reducing its value is conducive to reduce the casing external pressure and to prolong casing service life.When the elastic modulus of the cement sheath is large,increasing its value is conducive to reduce the casing external pressure and to prolong casing service life.The casing external pressure will become large with the increase of Poisson's ratio of cement sheath.With the increase of the degree of the formation stress unevenness,the maximum casing external pressure increases and the smallest external decreases.The increasing of the non-uniformity degree of formation stress makes the non-uniformity degree of casing external pressure and the risk of casing failure increase.The study can provide certain reference for drilling workers to take measures to prolong service life of casing. | Hongkun Zhang Baojiang Sun Guomin Yan ZhiyuanWang Mingzhao Huang | 2016 | Petroleum2016，2，1： | 1 |
| 11 | Experimen tal study on the friction coefficient of supercritical carbon di oxide in pipes 显示文摘 | Wang Zhiyuan Sun Baojiang Wang Jintang | 2014 | International Journal of Greenhouse Gas Control2014，25，6： | 1 |
| 12 | Proppant transport in rough fractures of unconventional oil and gas reservoirs显示文摘A method to generate fractures with rough surfaces was proposed according to the fractal interpolation theory.Considering the particle-particle,particle-wall and particle-fluid interactions,a proppant-fracturing fluid two-phase flow model based on computational fluid dynamics(CFD)-discrete element method(DEM)coupling was established.The simulation results were verified with relevant experimental data.It was proved that the model can match transport and accumulation of proppants in rough fractures well.Several cases of numerical simulations were carried out.Compared with proppant transport in smooth flat fractures,bulge on the rough fracture wall affects transport and settlement of proppants significantly in proppant transportation in rough fractures.The higher the roughness of fracture,the faster the settlement of proppant particles near the fracture inlet,the shorter the horizontal transport distance,and the more likely to accumulate near the fracture inlet to form a sand plugging in a short time.Fracture wall roughness could control the migration path of fracturing fluid to a certain degree and change the path of proppant filling in the fracture.On the one hand,the rough wall bulge raises the proppant transport path and the proppants flow out of the fracture,reducing the proppant sweep area.On the other hand,the sand-carrying fluid is prone to change flow direction near the contact point of bulge,thus expanding the proppant sweep area. | YIN Bangtang ZHANG Chao WANG Zhiyuan SUN Baojiang GAO Yonghai WANG Xiaopeng BI Chuang ZHANG Qilong WANG Jintang SHI Juntai | 2023 | Petroleum Exploration and Development2023，50，3： | 0 |
| 13 | Characterization of mulberry leaf instant tea and evaluation of its hypolipidemia effect via regulation of intestinal microbiota显示文摘The purpose of this study was to characterize mulberry leaf instant tea(MLIT)powder prepared from the'Longsang No.1'(Morus abla L.cv.Longsang 1)mulberry leaves in Heilongjiang Province(China)and assess its obesity-preventing/relieving effects.A total of 174 compounds including quercetin,chlorogenic acid,1-deoxyecomycin(1-DNJ)related to antihyperlipidemia effects were identified from the MLIT powder.MLIT treatment reversed the Lee's index,fat coefficient,and serum biochemical parameters in both the obesity relieving and obesity preventing mice fed with high-fat diet.In the obesity relieving experiment,the relative abundance of Desulfovibrio in mouse feces decreased after both 0.5%and 1%MLIT treatments.In obesity preventing experiments,mouse with different amount of MLIT treatments showed increased relative abundance of Akkermansia,Bifidobacterium and Lactobacillus,while Deferribacteres,Desulfobacterota decreased.The beneficial bacteria in the intestinal tract of mice treated with MLIT increased.This study proved that MLIT had antihyperlipidemia potential via modulating intestinal microbiota in mice. | Xiaoyun Han Yunlong Bai Xiaoxin Feng Baochang Du Baojiang Zheng Qingshen Sun | 2024 | Food Science and Human Wellness2024，13，3： | 0 |
| 14 | Methane hydrate crystal growth on shell substrate显示文摘Hydrate crystals growth on the surface of methane bubble(hydrate film)in pure water was studied by using a high-pressure visible microscope under the conditions of subcoolingΔT=5.44-13.72 K and methane concentration differenceΔC=2.92-8.19 mol·L^(-1).It was found the hydrate film is porous and the hydrate crystals grow towards the liquid phase on the film substrate.The crystal morphology and growth rate are affected byΔT andΔC.WhenΔT<8.82 K andΔC<4.12 mol·L^(-1),the hydrate grows into scattered columnar crystals,and the axial growth rate of the crystal gradually decreases.WhenΔT>8.82 K orΔC>4.12 mol·L^(-1),the hydrate crystals grow in dendritic shape,and the axial growth rate increases first and then decreases.The perimeter and area of the growing hydrate crystals were measured,and the fractal dimension of hydrate crystal under differentΔC andΔT was calculated.The results show that the fractal dimension of columnar hydrate crystal is greater than 3.When3.87 mol·L^(-1)<ΔC<4.20 mol·L^(-1) and 7.4 K<ΔT<8.8 K,the fractal dimension of columnar hydrate crystal is greater than 4;The fractal dimension of dendritic hydrate crystal is less than 3.WhenΔC>4.77 mol·L^(-1),ΔT<8.52 K,the fractal dimension of dendritic hydrate crystal is less than 2. | Xin Jiang Baojiang Sun Zhiyuan Wang Wantian Zhou Jiakai Ji Litao Chen | 2022 | Chinese Journal of Chemical Engineering2022，35，3： | 0 |
| 15 | Prediction of wax precipitation region in wellbore during deep water oil well testing显示文摘During deep water oil well testing, the low temperature environment is easy to cause wax precipitation, which affects the normal operation of the test and increases operating costs and risks. Therefore, a numerical method for predicting the wax precipitation region in oil strings was proposed based on the temperature and pressure fields of deep water test string and the wax precipitation calculation model. And the factors affecting the wax precipitation region were analyzed. The results show that: the wax precipitation region decreases with the increase of production rate, and increases with the decrease of geothermal gradient, increase of water depth and drop of water-cut of produced fluid, and increases slightly with the increase of formation pressure. Due to the effect of temperature and pressure fields, wax precipitation region is large in test strings at the beginning of well production. Wax precipitation region gradually increases with the increase of shut-in time. These conclusions can guide wax prevention during the testing of deep water oil well, to ensure the success of the test. | GAO Yonghai LIU Kai ZHAO Xinxin LI Hao CUI Yanchun XIN Guizhen SUN Baojiang | 2018 | Petroleum Exploration and Development2018，45，2： | 0 |
| 16 | Characteristics and evolution of faults in the north-central Yin’e Basin and the effects on the coal-seam in the Cretaceous strata显示文摘Research on the characteristics of faults and their evolutionary history since the Cretaceous in the Suhongtu-Dagu depressions can provide a theoretical basis for geological evaluation of the coal seams in the Suhongtu Formation in the northern-central region of the Yin’e Basin.Using 3-D seismic-logging inversion techniques,seismic stratigraphic calibration,stratigraphic sequence delineation,and thickness calculations on the Suhongtu-Dagu depressions were carried out to clarify the planar and profile distributions of the faults,as well as the evolutionary history of these faults and the tectonic history of the depressions.The results of this study revealed that the distribution of the faults in the Suhongtu-Dagu depressions in the northern part of the Yin’e Basin varies with region,and the fault system was multi-period,orthotropic,north-east-trending,and north-north-east-trending,with a certain degree of inheritance in terms of the geological setting.Three types of faults were identified:Y-shaped fractures,reverse Y-shaped fractures,and parallel fractures,which can be classified as Paleozoic-Cenozoic continuous syncline faults and intra-depression faults from the top of the Permian to the Upper Cretaceous series and inter-stratigraphic adjustment faults within the Cretaceous System,respectively.The evolution of these faults can be divided into three phases:the controlling faults were the faults that existed before the Early Cretaceous and had been active since then;synclinal faults that formed during the Early Cretaceous;and modified faults that formed since the Early Cretaceous.The development and modification of the coal seams in the Cretaceous Suhongtu Formation in the Hari,Kuanzihu,and Babei sags were strongly controlled and influenced by a multi-phase complex fault system. | Qiang YU Baojiang WANG Zhanli REN Xianyao SUN Xianghe LEI Ahmed KHALED Qike YANG | 2023 | Frontiers of Earth Science2023，17，1： | 0 |
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