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| 1 | Pore network modeling of water block in low permeability reservoirs显示文摘A pore network model was used in this paper to investigate the factors, in particular, throat radius, wettability and initial water saturation, causing water block in low permeability reservoirs. A new term–‘relative permeability number’ (RPN) was firstly defined, and then used to describe the degree of water block. Imbibition process simulations show that the RPN drops in accordance with the extension of the averaged pore throat radius from 0.05 to 1.5 μm, and yet once beyond that point of 1.5 μm, the RPN reaches a higher value, indicating the existence of a critical pore throat radius where water block is the maximum. When the wettability of the samples changes from water-wet to weakly water-wet, weakly gas-wet, or gas(oil)-wet, the gas RPN increases consistently, but this consistency is disturbed by the RPN dropping for weakly water-wet samples for water saturations less than 0.4, which means weakly water-wet media are more easily water blocked than water-wet systems. In the situation where the initial water saturation exceeds 0.05, water block escalates along with an increase in initial water saturation. | Shao Changjin Yang Zhenqing Zhou Guanggang Lu Guiwu | 2010 | Petroleum Science2010，7，3： | 11 |
| 2 | Molecular dynamics simulation of adsorption of an oil-water-surfactant mixture on calcite surface显示文摘An interface super molecular structure model for oil-water-surfactant mixture and calcite was established.By using a molecular dynamics method,the effects of rhamnolipid,sodium dodecyl benzene sulfonate and sodium hexadecyl sulfonate on the interface adsorption behavior of oil molecules were investigated.It was found that these three surfactants could reduce oil-calcite interface binding energy,and play a role of oil-displacing agent. | Lu Guiwu Zhang Xuefen Shao Changjin Yang Hong | 2009 | Petroleum Science2009，6，1： | 5 |
| 3 | Superior performance porous carbon nitride nanosheets for helium separation from natural gas:Insights from MD and DFT simulations显示文摘Increasing helium(He)demand in fundamental research,medical,and industrial processes necessitates efficient He purification from natural gas.However,most theoretically available membranes focus on the separation of two or three kinds of gas molecules with He and the underlying separation mechanism is not yet well understood.Using molecular dynamic(MD)and first-principle density function theory(DFT)simulations,we systematically demonstrated a novel porous carbon nitride membrane(g-C_(9)N_(7))with superior performance for He separation from natural gas.The structure of g-C_(9)N_(7) monolayer was optimized first,and the calculated cohesive energy confirmed its structural stability.Increasing temperature from 200 to 500 K,the g-C_(9)N_(7)membrane revealed high He permeability,as high as 1.48×10^(7) GPU(gas permeation unit,1 GPU=3.35×10^(-10) mol·s^(-1)·Pa^(-1)·m^(-2))at 298 K,and also exhibited high selectivity for He over other gases(Ar,N_(2),CO_(2),CH_(4),and H_(2)S).Then,the selectivity of He over Ne was found to decrease with increasing the total number of He and Ne molecules,and to increase with increasing He to Ne ratio.More interestingly,a tunable He separation performance can be achieved by introducing strain during membrane separation.Under the condition of 7.5%compressive strain,the g-C_(9)(N_(7)(membrane reached the highest He over Ne selectivity of 9.41×10^(2).It can be attributed to the low energy barrier for He,but increased energy barrier for other gases passing through the membrane,which was subject to a compressive strain.These results offer important insights into He purification using g-C_(9)N_(7)membrane and opened a promising avenue for the screening of industrial grade gas separation with strain engineering. | Zilong Liu Ge Zhao Xiao Zhang Lei Gao Junqing Chen Weichao Sun Guanggang Zhou Guiwu Lu | 2021 | Chinese Journal of Chemical Engineering2021，34，9： | 1 |
| 4 | Molecular dynamics investigation into the adsorption of oil–water–surfactant mixture on quartz显示文摘 | Zhang Xuefen Lu Guiwu Wen Xiaoming Yang Hong | 2009 | Applied Surface Science2009，，13： | 1 |
| 5 | The effect of the partial pressure of H 2 S on the permeation of hydrogen in low carbon pipeline steel显示文摘 | Chengshuang Zhou Shuqi Zheng Changfeng Chen Guiwu Lu | 2013 | Corrosion Science2013，，： | 1 |
| 6 | Efficient photocatalytic hydrogen evolution coupled with benzaldehyde production over 0D Cd_(0.5)Zn_(0.5)S/2D Ti_(3)C2 Schottky heterojunction显示文摘Converting water into hydrogen fuel and oxidizing benzyl alcohol to benzaldehyde simultaneously under visible light illumination is of great significance,but the fast recombination of photogenerated carriers in photocatalysts seriously decreases the conversion efficiency.Herein,a novel dual-functional 0D Cd_(0.5)Zn_(0.5)S/2D Ti_(3)C2 hybrid was fabricated by a solvothermally in-situ generated assembling method.The Cd_(0.5)Zn_(0.5)S nano-spheres with a fluffy surface completely and uniformly covered the ultrathin Ti_(3)C2 nanosheets,leading to the increased Schottky barrier(SB)sites due to a large contact area,which could accelerate the electron–hole separation and improve the light utilization.The optimized Cd_(0.5)Zn_(0.5)S/Ti_(3)C2 hybrid simultaneously presents a hydrogen evolution rate of 5.3 mmol/(g·h)and a benzaldehyde production rate of 29.3 mmol/(g·h),which are~3.2 and 2 times higher than those of pristine Cd_(0.5)Zn_(0.5)S,respectively.Both the multiple experimental measurements and the density functional theory(DFT)calculations further demonstrate the tight connection between Cd_(0.5)Zn_(0.5)S and Ti_(3)C2,formation of Schottky junction,and efficient photogenerated electron–hole separation.This paper suggests a dual-functional composite catalyst for photocatalytic hydrogen evolution and benzaldehyde production,and provides a new strategy for preventing the photogenerated electrons and holes from recombining by constructing a 0D/2D heterojunction with increased SB sites. | Junnan TAO Mingyuan WANG Guiwu LIU Qinqin LIU Lei LU Neng WAN Hua TANG Guanjun QIAO | 2022 | Journal of Advanced Ceramics2022，11，7： | 1 |
| 7 | Lattice Vibration and Absorbance of Er-Yb:YCOB Single Crystals显示文摘 | Lu Guiwu Li Chunxi | 2003 | Chemical Physics Letters2003，368，5： | 1 |
| 8 | Raman investigation of lattice vibration modes and thermal conductivity of Nd-doped zircon-type laser crystals显示文摘 | LU Guiwu LI Chunxi WANG Wenchuan | 2003 | Mater Sci Eng B2003，98，： | 1 |
| 9 | Raman Investigation of Lattice Vibration Modes and Thermal Conductivity of Nd-doped Zircon-type Laser Crystals显示文摘 | Lu Guiwu Li Chunxi Wang Wenchuan | 2003 | Materials Science and Engineering2003，98，： | 1 |
| 10 | Enhanced thermoelectric performance in n-type Mg_(3.2)Sb_(1.5)Bi_(0.5) doping with lanthanides at the Mg site显示文摘Mg-based thermoelectric materials have attracted more and more attention because of their rich composition elements,green environmental protection,and lower price.In recent years,the thermoelectric properties of n-type Mg_(3)Sb_(2) materials have been optimized by doping chalcogenide elements(S,Se,and Te)at the anionic position.In this work,n-type Mg_(3.2)A_(x)Sb_(1.5)Bi_(0.5)(A=Gd,Ho;x=0.01,0.02,0.03,and 0.4)samples were prepared by the cation site doping of lanthanide elements(Gd and Ho).The research results show that Gd and Ho doped n-type Mg3.2Sb1.5Bi0.5samples are entirely comparable to the S,Se,and Te doped n-type Mg3.2Sb1.5Bi0.5samples,demonstrating more excellent thermoelectric properties.Doping with lanthanides(Gd and Ho)at the Mg site increases the carrier concentration of the material to 8.161×10^(19)cm^(-3).Doping induces the contribution of more electron,thus obtaining higher conductivity.The maximum zT value of the Mg_(3.2)Gd_(0.02)Sb_(1.5)Bi_(0.5) and the Mg_(3.2)Ho_(0.02)Sb_(1.5)Bi_(0.5) samples reaches 1.61 and 1.55,respectively.This work theoretically and experimentally demonstrates Gd and Ho are efficient n-type dopants for Mg_(3.2)Sb_(1.5)Bi_(0.5) thermoelectric material. | Lu Yu Zipei Zhang Juan Li Wenhao Li Shikai Wei Sitong Wei Guiwu Lu Weiyu Song Shuqi Zheng | 2022 | Journal of Materials Science & Technology2022，，32： | 0 |
| 11 | Effect of Aging Temperature on Stress Corrosion Cracking of 17-4 PH Stainless Steel in Wet H_2S Environment显示文摘The effect of aging temperature on stress corrosion crocking of 17-4 precipitation-hardened(PH)stainless steel in simulated stimulant oil well environment was studied by the method B-NACE standard bent-beam test.It is found that when aging temperature ranges from 480 to 610℃,the sensitivity of hydrogen embrittlement decreases significantly. | Zhou Chengshuang,Zheng Shuqi,Chen Changfeng,Lu Guiwu China University of Petroleum,Beijing 102249,China | 2012 | 稀有金属材料与工程2012，41，S1： | 0 |
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