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Experimental study on solid particle migration and production behaviors during marine natural gas hydrate dissociation by depressurization

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Petroleum Science 2023年第6期20卷 3610-3623页

作者： Yan-long Li fu-long ning Meng Xu Min-Hui Qi Jia-Xin Sun Alireza Nouri De-Li Gao Neng-You Wu Key Laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao Institute of Marine GeologyQingdao266237ShandongChina Laboratory for Marine Mineral Resources Laoshan LaboratoryQingdao266237ShandongChina Faculty of Engineering China University of Geosciences-WuhanWuhan430074HubeiChina MOE Key Laboratory of Petroleum Engineering China University of PetroleumBeijing102249China School of Mining and Petroleum Engineering University of AlbertaEdmontonABCanada

Sand production is one of the main obstacles restricting gas extraction efficiency and safety from marine natural gas hydrate(NGH)*** migration within the NGH reservoir dominates sand production behaviors,while their relationships were rarely reported,severely constrains quantitative evaluation of sand production *** paper reports the optical observations of solid particle migration and production from micrometer to mesoscopic scales conditioned to gravel packing during depressurization-induced NGH dissociation for the first *** evolutionary modes of sand migration are established based on experimental observations,and its implications on field NGH are comprehensively *** particle migration regimes of local borehole failure,continuous collapse,wormhole expansion,extensive slow deformation,and pore-wall fluidization are proved to occur during *** types of particle migration regimes and their transmission modes during depressurization are predominantly determined by initial hydrate *** contrast,the depressurization mainly dominates the transmission rate of the particle migration ***,both the cumulative mass and the medium grain size of the produced sand decrease linearly with increasing initial methane hydrate(MH)*** gas bubble emission,expansion,and explosion during MH dissociation delay sand migration into the *** the same time,continuous water flow is a requirement for sand production during hydrate dissociation by *** experiments enlighten us that a constitutive model that can illustrate visible particle migration regimes and their transmission modes is urgently needed to bridge numerical simulation and field *** wellbore layout positions or special reservoir treatment shall be important for mitigating sand production tendency during NGH exploitation.

关键词： Natural gas hydrate Solid particle migration Sand production Sand control Sanding Hydrate exploitation

A sand-production control system for gas production from clayey silt hydrate reservoirs

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China Geology 2019年第2期2卷 121-132页

作者： Yan-long Li Neng-you Wu fu-long ning Gao-wei Hu Chang-ling Liu Chang-yin Dong Jing-an Lu Key Laboratory for Gas Hydrate of Ministry of Natural Resources China Geological SurveyMinistry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266071China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China Faculty of Engineering China University of GeosciencesWuhan 430074China School of Petroleum Engineering China University of PetroleumQingdao 266580China Guangzhou Marine Geological Survey China Geological SurveyMinistry of Natural ResourcesGuangzhou 510075China

Sand production is a crucial problem during the process of extracting natural gas from hydrate reservoirs. To deal with sand-production problems systematically, a sand-production control system (SCS) is first proposed in this paper, specialized for pore-distributed clayey silt hydrate reservoirs. Secondly, a nodal system analysis method (NSAM) is applied to analyze the sand migration process during hydrate exploitation. The SCS is divided into three sub-systems, according to different sand migration mechanisms, and three key scientific problems and advances in SCS research in China Geological Survey are reviewed and analyzed. The maximum formation sanding rate, proper sand-control gravel size, and borehole blockage risk position were provided for clayey hydrate exploitation wells based on the SCS analysis. The SCS sub-systems are closely connected via bilateral coupling, and coordination of the subsystems is the basis of maintaining formation stability and prolonging the gas production cycle. Therefore, contradictory mitigation measures between sand production and operational systems should be considered preferentially. Some novel and efficient hydrate exploitation methods are needed to completely solve the contradictions caused by sand production.

关键词： Natural gas hydrate Hydrate exploitation Sand-production management Sand production Sand control Nodal system analysis

Application of frequency division inversion in the prediction of heterogeneous natural gas hydrates reservoirs in the Shenhu Area,South China Sea

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China Geology 2022年第2期5卷 251-266页

作者： Shu-yu Wu Jun Liu Hua-ning Xu Chang-ling Liu fu-long ning Hong-xian Chu Hao-ran Wu Kai Wang School of Engineering China University of GeosciencesWuhan 430074China Yantai Coastal Zone Geological Survey Center China Geological SurveyYantai 264001China Chinese Academy of Geological Sciences Beijing 100037China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266061China The Key Laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266071China

Drilling results suggest that the thickness of natural gas hydrates(NGHs)in the Shenhu Area,South China Sea(SCS)are spatially heterogenous,making it difficult to accurately assess the NGHs resources in this *** the case that free gas exists beneath hydrate deposits,the frequency of the hydrate deposits will be noticeably attenuated,with the attenuation degree mainly affected by pore development and free gas ***,the frequency can be used as an important attribute to identify hydrate *** on the time-frequency characteristics of deposits,this study predicted the spatial distribution of hydrates in this area using the frequency division inversion method as ***,the support vector machine(SVM)method was employed to study the amplitude versus frequency(AVF)response based on seismic and well logging ***,the AVF response was introduced as independent information to establish the nonlinear relationship between logging data and seismic ***,the full frequency band information of the seismic data was fully utilized to obtain the results of frequency division *** inversion results can effectively broaden the frequency band,reflect the NGHs distribution,and reveal the NGHs reservoirs of two types,namely the fluid migration pathway type and the in situ self-generation self-storage diffusion ***,the inversion results well coincide with the drilling ***,it is feasible to use the frequency division inversion to predict the spatial distribution of heterogeneous NGHs reservoirs,which facilitates the optimization of favorable drilling targets and is crucial to the resource potential assessment of NGHs.

关键词： Gas hydrates Heterogeneity Frequency division inversion Self-generation and self-storage diffusion type NGHs exploration trial engineering Oil and gas exploration engineering Shenhu Area South China Sea

Large borehole with multi-lateral branches: A novel solution for exploitation of clayey silt hydrate

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China Geology 2019年第3期2卷 333-341页

作者： Yan-long Li Yi-zhao Wan Qiang Chen Jia-xin Sun Neng-you Wu Gao-wei Hu fu-long ning Pei-xiao Mao Key Laboratory for Natural Gas Hydrate of Ministry of Natural Resources Qingdao Institute of Marine GeologyChina Geological SurveryMinistry of Natural ResourcesQingdao 266071China Laboratory for Marine Mineral Resource Pilot National Laboratory for Marine Science and TechnologyQingdao 266071China Faculty of Engineering China University of GeosciencesWuhan 430074China

Raising the in situ decomposition rate of natural gas hydrate and increasing the decomposition contact area are two main ways to raise the productivity of hydrate. An exploitation technique based on large borehole with multi-lateral branches (LB & MB) was proposed in this paper. This technique is mainly intended for the clayey silt hydrate reservoir in the South China Sea, and its main purpose is to alleviate the sand output from formation for maintaining the stability of the reservoir and to greatly increase the gas productivity of the reservoir. In this paper, the following aspects were mainly expounded: definition of the basic geometric parameters for layout of multi-lateral branches in clayey silt hydrate reservoir, simulation of the stimulation effect of a typical well profile with two branches, and prediction and simulation of the reservoir failure risk in a well profile with eight branches. The results show that the LB & MB effectively improves the flow field in the formation, raises the productivity of the reservoir and may also help to decrease the produced water-gas ratio (WGR). When the lateral branches spacing is too small, the failure zones around adjacent lateral branches overlap each other, possibly causing reservoir failure in a larger range. Therefore, the geometric parameters of multi-lateral branches depend on the dual control of the productivity and geotechnical risk factor of reservoir. further study is being carried out, so as to obtain the optimal combination of parameters of multi-lateral branches.

关键词： Natural gas hydrate Clayey silt Multi-lateral branches Stimulation Numerical simulation Hydrate exploration engineering South China Sea China

A breakthrough of printable mesoscopic perovskite solar cells

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Science China Materials 2025年第1期68卷 307-308页

作者： Zhiyi Yao Zhijun ning School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

High-performance solar cells based on low-cost wet coating methods are the much-anticipated technology for the next generation of photovoltaics. Perovskite solar cells (PSCs) provide a fascinating choice because their... 详细信息

关键词： perovskite breakthrough absorber

Profiles,exposure assessment and expanded screening of PAHs and their derivatives in one petroleum refinery facility of China

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Journal of Environmental Sciences 2025年第1期147卷 550-560页

作者： ning Wang Fengjiao Jiang Lin Xu Yaqi Cai School of Municipal and Environmental Engineering Shandong Jianzhu UniversityJinan 250101China Resource and Environmental Innovation Institute Shandong Jianzhu UniversityJinan 250101China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China School of Environment Hangzhou Institute for Advanced StudyUCASHangzhou 330106China Hubei Key Laboratory of Environmental and Health Effects of Persistence Toxic Substances Institute of Environment and HealthJianghan UniversityWuhan 430056China

This study investigated environmental distribution and human exposure of polycyclic aromatic hydrocarbons(PAHs)and their derivatives in one Chinese petroleum refinery *** was found that,following with high concentrations of 16 EPA PAHs(∑Parent-PAHs)in smelting subarea of studied petroleum refinery facility,total derivatives of PAHs[named as XPAHs,including nitro PAHs(NPAHs),chlorinated PAHs(Cl-PAHs),and brominated PAHs(Br-PAHs)]in gas(mean=1.57×10^(4)ng/m^(3)),total suspended particulate(TSP)(mean=4.33×10^(3) ng/m^(3))and soil(mean=4.37×10^(3) ng/g)in this subarea had 1.76-6.19 times higher levels than those from other subareas of this facility,surrounding residential areas and reference areas,indicating that petroleum refining processes would lead apparent derivation of ***,compared with those in residential and reference areas,gas samples in the petrochemical areas had higher∑NPAH/∑PAHs(mean=2.18),but lower∑Cl-PAH/∑PAHs(mean=1.43×10^(-1))and∑Br-PAH/∑PAHs ratios(mean=7.49×10^(-2)),indicating the richer nitrification of PAHs than chlorination during petrochemical *** occupational exposure to PAHs and XPAHs in this petroleum refinery facility were 24-343 times higher than non-occupational exposure,and the ILCR(1.04×10^(-4))for petrochemical workers was considered to be potential high ***,one expanded high-resolution screening through GC Orbitrap/MS was performed for soils from petrochemical area,and another 35 PAHs were found,including alkyl-PAHs,phenyl-PAHs and other species,indicat-ing that profiles and risks of PAHs analogs in petrochemical areas deserve further expanded investigation.

关键词： Polycyclic aromatic hydrocarbons(PAHs) Derivatives Petroleum refinery Human exposure Non-targeted screening

Differential-geometry-based multi-dimensional joint position-velocity estimation using Crab pulsar profile distortion

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Chinese Journal of Aeronautics 2025年第1期38卷 551-567页

作者： Jin LIU Huanzi ZHANG Xiaolin ning Xin MA School of Electronic Information Wuhan University of Science and TechnologyWuhan 430081China School of Instrumentation and Optoelectronic Engineering Beihang UniversityBeijing 100191China Hefei National Laboratory Hefei 230088China

The traditional orbit determination method based on pulsar profile distortion can determine the six elements of the ***,the estimation accuracies of these methods are limited and the computational load of a six-dimensional search is *** solve this problem,the differential-geometry-based Multi-dimensional Joint Position-Velocity Estimation(MJPVE)using Crab pulsar profile distortion is proposed in this ***,through theoretical analysis,it is found that the pulsar profile distortion caused by the initial state error in some joint positionvelocity directions is very *** other words,the accuracies of estimation in these directions are very ***,the search dimension can be reduced,which in turn greatly reduces the computational ***,we construct the chi-squared function of the pulsar profile with respect to the estimation error in joint position-velocity direction and use differential geometry to find the joint position-velocity directions corresponding to different degrees of ***,we utilize the grid search based on directory folding in these joint position-velocity directions corresponding to large degrees of distortion to obtain the joint position-velocity *** experimental results show that compared with the grouping bi-chi-squared inversion method,MJPVE has high precision and extensive navigation information.

关键词： Joint Position-Velocity Estimation Pulsars Profile Distortion Orbit Determination Differential Geometry

A new exceptionally preserved corystosperm wood from the Jurassic of East Asia

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Science China Earth Sciences 2025年第3期68卷 803-810页

作者： Zikun JIANG ning TIAN Yongdong WANG Fangyu LI Junling PEI Dieter UHL Ya LI Hao WU Zhenguo ning Ruiying HAO Chinese Academy of Geological Sciences College of Palaeontology Shenyang Normal University Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences College of Resources and Environmental Engineering Guizhou University East China University of Technology Senckenberg Research Institute and Natural History Museum Frankfurt Zhejiang Museum of Natural History Department of Natural Resources of Shandong Province

Corystosperms, an extinct group of “seed ferns” that lived from the late Permian to the Cretaceous or Eocene, are significant for seed plant phylogeny for their unique roles in partially resolving the long-standing question of angiosperm origins.A new fossil wood taxon, Fengweioxylon sinense gen. et sp. nov. is reported here based on exceptionally preserved wood material from the Jurassic in western Liaoning, China, whose peculiar wood structure enables it to be recognized as the first unequivocal fossil wood record of a corystosperm plant in Laurasia. The anatomical structures of this corystosperm wood show gymnospermous characters. The discovery of the new specimen will provide more anatomical evidence for understanding the systematic and affinity of this seed plants.

关键词： Corystosperms Fossil wood Laurasia Jurassic

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Tetrahydrocurcumin-induced apoptosis of hepatocellular carcinoma cells involves the TP53 signaling pathway,as determined by network pharmacology

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World Journal of Gastrointestinal Oncology 2025年第3期17卷 221-236页

作者： Zhuo-Cong Bao Ye Zhang Zhao-Dong Liu Hui-Jun Dai fu Ren ning Li Shang-Yu Lv Yan Zhang Graduate School Shenyang Medical CollegeShenyang 110034Liaoning ProvinceChina Guangxi Medical University Cancer Hospital Guangxi Medical UniversityNanning 530021Guangxi Zhuang Autonomous RegionChina Key Laboratory of Human Ethnic Specificity and Phenomics of Critical Illness in Liaoning Province Shenyang Medical CollegeShenyang 110034Liaoning ProvinceChina Key Laboratory of Phenomics in Shenyang Shenyang Medical CollegeShenyang 110034Liaoning ProvinceChina Department of Biochemistry School of Basic MedicineShenyang Medical CollegeShenyang 110034Liaoning ProvinceChina Department of Clinical Medicine Shenyang Medical CollegeShenyang 110034Liaoning ProvinceChina International Education School International Exchange and Cooperation OfficeShenyang Medical CollegeShenyang 110034Liaoning ProvinceChina

BACKGROUND Hepatocellular carcinoma(HCC)is a malignant disease with high incidence and mortality *** study focuses on the TP53 target protein to investigate the potential therapeutic effect of tetrahydrocurcumin(THC)on HCC and its mechanism of *** research hypothesis is that THC can inhibit the proliferation,migration,and invasion of HCC cells,and promote their apoptosis by regulating the TP53 target *** To explore the mechanism by which THC inhibits HCC cell proliferation via the TP53 signaling *** Potential targets of THC and HCC were identified from multiple *** core targets were subjected to analyses using Gene Ontology and Kyoto Encyclopedia of Genes and Genomes databases,and visualization processing,using the online platform Metascape to identify the key molecules and signaling pathways involved in the action of THC against *** molecular mechanisms of action of THC against TP53 in the inhibition of HCC cells were verified using cell counting kit-8,Transwell,apoptosis,and western blotting *** Molecular docking results showed that THC had a high score for the TP53 target *** vitro experiments indicated that THC effectively inhibited the proliferation and migration of HCC cells,and affected the expression levels of TP53,MDM2,cyclin B,Bax,Bcl-2,caspase-9,and *** THC induces the apoptosis of HCC cells through the TP53 signaling pathway,thereby inhibiting their proliferation and migration.

关键词： Hepatocellular carcinoma cells Tetrahydrocurcumin TP53 Network pharmacology Molecular docking