Qingping Li

Ocean University of China

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Jiafei Zhao

Dalian Ocean University

Lei Yang

Dalian University of Technology

Weixin Pang

China National Offshore Oil Corporation (China)

Xin Lv

Nanjing University

Lunxiang Zhang

Dalian University of Technology

Guangjin Chen

China University of Petroleum, Beijing

Yongchen Song

Dalian University of Technology

Chang‐Yu Sun

China University of Petroleum, Beijing

Shouwei Zhou

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation

Qi Hua Fan

Michigan State University

Cooperative Institutions

Chinese Academy of Sciences

205

China University of Petroleum, Beijing

165

Dalian University of Technology

135

University of Chinese Academy of Sciences

State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering

China National Offshore Oil Corporation (China)

Southwest Petroleum University

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation

China University of Petroleum, East China

Zhejiang University

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Condition Optimization and Properties of Gibberellic Acid Degradation by Aspergillus Niger TJ-1

Journal of Sichuan University (2012)

Qingping Li

The degradation of gibberellic acid(GA3) by the strain Aspergillus niger TJ-1 was studied.Plackett-Burman Design was used to screen important factors affecting its degradation,and response surface analysis was applied to optimize its degradation condition.The properties of GA3 degradation by the strain were also investigated.The results showed that Aspergillus niger TJ-1 could degrade GA3.Incubation temperature and the concentrations of ammonium sulfate and magnesium sulfatein the system are the major factors influencing GA3 degradation.The degradation rate of GA3 is up to 56.90% under the optimized condition,which is close to the predictive value from response surface model(57.64%).A regular change of GA3 contents,biomass and pH in the system with incubation time was observed.

Gibberellic acid

Aspergillus niger

Degradation

Ammonium sulfate

Strain (injury)

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Combining Sonic Wave Velocity, Density and Electrical Resistivity for Joint Estimation of Gas-Hydrates Reservoir Parameters and its Uncertainties

Xin Zhang Qingping Li Lixia Li Qi Fan Jianhua Geng

The most crucial reservoir parameters for assessing gas-hydrates resources are gas-hydrates concentration and porosity. Numerous academics suggested acoustic and electrical petrophysical models for estimating concentration and porosity of gas-hydrates. However, owing to limitations of a single petrophysical model, the estimation of gas-hydrates concentration and porosity using single acoustic or electrical measurement data appears to be inconsistent and uncertain. In this study, the density, sonic wave velocity, and resistivity well-logging data are combined with a Bayesian linear inversion method to estimate the gas-hydrates concentration and porosity simultaneously. Sonic wave velocity, density, and resistivity data of the Shenhu area in the South China Sea were used to estimate the gas–hydrates concentration and porosity. The estimation results were compared with those obtained using the pore water chlorinity. The well-logging data examples show that the joint estimation method not only quickly estimates the gas–hydrates reservoir parameters but also improves the accuracy and reduces uncertainty.

Clathrate hydrate

10.2139/ssrn.4449408

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Hydrate Formation and Deposition Behaviors with Kinetic Inhibitors Under Pseudo Multiphase Flow

Lunxiang Zhang Henglong Zou Bingyue Han Lang Chen Haiyuan Yao

With the successful application of kinetic hydrate inhibitors (KHIs) on hydrate plug prevention, there is a growing trend towards the development of affordable and environmentally friendly KHIs for solving challenges of high cost and inadequate biodegradability from their commercial KHIs. Therefore, further evaluation on the inhibitory effect of the developing inhibitors is needed under multiphase flow conditions. In this study, a high-pressure, fully visible rocking cell were used to simulate the multiphase transportation and both commercial KHIs and environmentally friendly KHIs were considered. The results revealed that, under the given conditions of this study, PVCap exhibited excellent inhibition performance. Although pectin exhibited certain inhibitory effect on hydrate growth rate and formation quantity, but it demonstrated a strong promoting effect on hydrate nucleation opportunities and rates. However, sodium alginate, which shares similar hydrate inhibition characteristics with pectin, exerted significantly promotional effects in terms of induction time, growth rate, and water conversion. Furthermore, the addition of pectin and sodium alginate led to the formation of hydrate balls in several test runs, resulting in complete pipeline blockage. Another noteworthy discovery was the relationship between the growth rate and final water conversion of hydrates, which exhibited an initial increase followed by a decrease, while the induction time exhibits an inverse trend, as the flow velocity increased.

Deposition

Clathrate hydrate

10.2139/ssrn.4604764

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Stability analysis of the moving interface in piston- and non-piston-like displacements

Acta Mechanica Sinica (2008)

Yuhu Bai Jifu Zhou Qingping Li

Piston (optics)

Interface (matter)

Position (finance)

10.1007/s10409-008-0161-2

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Citations (3)

Study of Uneven Distribution in Parallel Petroleum Processing Pipes

Volume 3: Operations, Monitoring, and Maintenance; Materials and Joining (2016)

Renwei Liu Haishan Zhu Qingping Li Yufei Wan Kaifeng Fan

The aim of this article is to investigate uneven distribution of oil-gas two phase flow in parallel petroleum processing pipelines. On-site analysis on BZ35-2 central platform A and SZ36-1 central platform N/O (two typical platforms in China’s Bohai Bay) shows that uneven distribution is originated mainly by two sources: flow rate difference and dryness difference. A 3-dimensional numerical model of two-phase flow in T-junction before parallel processing units was built. Flow and dryness distribution under different operating conditions were simulated. It is demonstrated that unevenness of flow rate grows worse as the total flow rate increases or operating pressure difference between parallel units becomes larger. Moreover, unevenness of dryness is mainly caused by phase split in a tee. It can be concluded that the phase split will be more obvious when parallel units are located at different heights or gas volume fraction of feed stream and inlet flow rate is small. Besides, flow rate distribution has an effect on dryness distribution. There is a specific flow ratio that will cause the most serious phase split. Finally, according to the conclusions, modification scheme for BZ35-2 central platform A piping layout was proposed. And this work may provide some guidance for process design and practical operation of parallel units.

Dryness

Multiphase flow

10.1115/ipc2016-64262

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Voltage Balancing Design, Experiment and Application for High Voltage Converter with Series-Connected IGBTs

2022 IEEE Energy Conversion Congress and Exposition (ECCE) (2024)

Juanjuan Lu Yunfei Xu Weiguo Li Xianzhe Bao Qingping Li

High Voltage

10.1109/ecce55643.2024.10861148

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Gas hydrate equilibrium dissociation conditions in porous media using two thermodynamic approaches

The Journal of Chemical Thermodynamics (2008)

Xiao‐Sen Li Yu Zhang Gang Li Zhaoyang Chen Kefeng Yan

Fugacity

Clathrate hydrate

10.1016/j.jct.2008.04.009

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Citations (116)

Recognition and Variation Characteristics of Second Order Sequence Boundary in Middle Part of Cambrian in Luxi Area

Land and Resources in Shandong Province (2004)

Qingping Li

On the basis of biostratigraphic information of strata profile with the scale of 1∶50000 and 1∶200000, combining with field trace, and using proximate isochronism of biostratigraphic zone, second order sequence boundary in middle part of Cambrian in Luxi area is studied emphatically. It is regarded that this boundary occurs in lower part of shale in Mantou formation, upper part of shale in Honghe formation and Mantou formation and lower part of limestone in Zhangxia formation. It occurs in Luxi area widely with stable strend. It transits from deceptive conformity to paraconformity frome NW to SE, and has an evident sedimentary break in west part. Sequence boundary belongs to Ⅱ type discontinuity.

Sequence (biology)

Discontinuity (linguistics)

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Seabed fluid flow in the China Seas

Frontiers in Marine Science (2023)

Chaoqi Zhu Qingping Li Zhenghui Li Minliang Duan Sanzhong Li

Seabed fluid flow is a widespread and important natural phenomenon in marine environments, which involves complex multi-physics, multi-process and multi-scale processes. The developments in offshore geophysical technology have facilitated the discovery of the widespread emissions of seabed fluids. For an overview on the state-of-the-art seabed fluid flow research and for obtaining a perspective on future research in the China Seas, we reviewed the data, reports, and publications particularly that associated with cold seeps such as pockmarks, seeps, domes, mud volcanoes, and gas hydrates in the Bohai Sea, the Yellow Sea, the East China Sea, and the South China Sea. This study presents the first report for seabed fluid flow on all China Seas with the basic information required to undertake additional analytical studies of these features. Furthermore, we explore processes responsible for them and their implications. Although the seabed fluid flow is widespread, dynamic, and influential, it is still poorly examined and understood. To understand seabed fluid flow in both time and space, it is important to investigate how and why these seabed fluids form and migrate.

Seabed

Mud volcano

10.3389/fmars.2023.1158685

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ADVANCES IN FORMATION MECHANISM AND DISSOCIATION KINETICS OF GAS HYDRATE IN SEDIMENTS

Lixue jinzhan (2011)

Qingping Li Xiaobing Lu

The study on the formation of gas hydrate in sediments is mainly summarized. Firstly, the formation mechanism and advances in bulk gas hydrate study, including nucleation mechanism, armor effect and memory effect etc., are briefly described. Secondly, the difficulty and advances in the formation of gas hydrate with low-solubility gases, such as methane, and the effects of chief factors, such as pore size, on the formation of gas hydrate in sediments are summarized. Thirdly, the major mathematical models on the kinetics of gas hydrate formation are presented. Finally, several issues to be further studied are highlighted.

Clathrate hydrate

Liquid bubble

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Citations (3)