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Characteristics and control mechanisms of coalbed permeability change in various gas production stages

Petroleum Science 2015年第4期12卷 684-691页

作者： Da-Zhen Tang Chun-Miao Deng Yan-Jun Meng Zhi-Ping Li Hao Xu Shu Tao Song Li School of Energy resources China University of Geosciences Coal Reservoir laboratory of National Engineering Research Center of Coalbed Methane Development & Utilization

According to dimensionless analysis of the coalbed methane （cbm） production data of Fanzhuang block in southern Qinshui basin, the dimensionless gas production rate is calculated to quantitatively divide the cbm well production process into four stages, i.e., drai- nage stage, unstable gas production stage, stable gas pro- duction stage, and gas production decline stage. By the material balance method, the coal reservoir permeability change in different stages is quantitatively characterized. The characteristics and control mechanisms of change in coalbed permeability （CICP） during different production stages are concluded on five aspects, i.e., permeability trend variation, controlling mechanism, system energy, phase state compositions, and production performance. The study reveals that CICP is characterized by first decline, then recovery, and finally by increase and is controlled directly by effective stress and matrix shrinkage effects. Further, the duration and intensity of the matrix shrinkage effect are inherently controlled by adsorption and desorp- tion features.

关键词： Production stage - Coalbed methane Permeability dynamic change - Control mechanism

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Self-adjusted elastic action and its cbm pool-forming effect of the high rank coal reservoir

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Chinese Science Bulletin 2005年第S1期50卷 99-103页

作者： QIN Yong FU Xuehai WU Caifang FU Guoyou BU Yingying Institute of Mineral resources and Geoscience China University of Mining&TechnologyXuzhou 221008China

The coal reservoir is a kind of geologic body with considerable elasticity, and its response to stress is more sensitive than the routine ones. In the pool-forming process of the coalbed methane, (cbm) the action of many external geodynamic factors in the coal reservoir is represented by the ability of cbm’s diffusion and migration in the coal reservoir. Therefore, the occurrence of the natural fissures in the coal reservoir becomes a key that determines whether the cbm pool can be formed or not. Based on the principle, the authors have designed a comprehensive method of physical modeling to study the elasticity of the coal matrix block with different coal ranks in the light of the solid to fluid coupling, have established the model of the volume deformation (self-adjusted elastic effect) of the coal reservoir under the condition of the effective stress-adsorption/desorption, and have obtained a correct understanding of the law of the elastic deformation. Afterwards, a new viewpoint, named as the self-closing elastic effect for forming the cbm pool in the high rank reservoir, is put forward, providing an initial point and a scientific basis for a further investigation into its dynamic factors, possible mechanism and role in the cbm energy-balancing system.

关键词： coalbed methane reservoir elasticity self-adjusted action pool-forming effect.

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Fluvial processes of the downstream reaches of the reservoirs in the Lower Yellow River

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Journal of Geographical Sciences 2016年第9期26卷 1321-1336页

作者： TIAN Shimin WANG Weihong XIE Baofeng ZHANG Min key laboratory of Yellow River Sediment MWR Institute of Hydraulic Research YRCC Zhengzhou 450003 China China Institute of Water resources and Hydropower Research Beijing 100038 China Department of Hydraulic Engineering North China University of Water Resources and Electric Power Zhengzhou 450045 China Xiaolangdi Project Construction and Management Center Zhengzhou 450003 China

Evolution of the river channel downstream of reservoirs is a complex process that is closely related to the operational mode of the reservoirs and the channel boundary conditions Numerous studies have been carried out on the fluvial processes of downstream reservoirs. However, only a few of them have focused on the relationship between runoff-sediment con- ditions and channel pattern indicators. Also, the impacts of river training works on fluvial processes are seldom dealt with. In this paper, the evolutionary processes of three sections in the Lower Yellow River, including Tiexie-Yiluo River mouth reach, Huayuankou-Heigangkou reach and Jiahetan-Gaocun reach, were analyzed for variations in the channel boundary line and the mainstream between 1960 and 2015. Channel pattern indicators such as sinuosity, mainstream wandering range and width/depth ratio were analyzed based on field measure- ments obtained by the Hydrological Department of the Yellow River Conservancy Commis- sion. The effects of river training works on the channel evolution are then described. Since 1960, numerous medium- and large-sized reservoirs have been built on the Yellow River, including Longyangxia Reservoir, Liujiaxia Reservoir and Xiaolangdi Reservoir. These res- ervoirs impound the runoff from upstream and retain the sediment, which changes the runoff and sediment conditions in the downstream reach. As a consequence, annual runoff and the frequency and peak of flooding have all decreased. As a result, the flow dynamics and their action on the river channel are also reduced, which changes the dynamic state of the river course. The discrimination results obtained using the single parameter discrimination rule and the discrimination equation show that the degree of wandering is weakened in the reaches studied. The variations in the channel pattern indicators show that the sinuosity in- creases and the wandering range decreases with a reduction in the total annual volume of water. However, the

关键词： wandering reach river course Lower Yellow River runoff and sediment conditions river trainingworks

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dynamic behavior of coalbed methane flow along the annulus of single-phase production

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International Journal of Coal Science & Technology 2019年第4期6卷 547-555页

作者： Xinfu Liu Chunhua Liu Guoqiang Liu School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520ShandongChina key lab of Industrial Fluid Energy Conservation and Pollution Control(Qingdao University of Technology) Ministry of EducationQingdao 266520ShandongChina College of Mechanical and Electronic Engineering China University of Petroleum(East China)Qingdao 266580ShandongChina PetroChina Coalbed Methane Co. Ltd.Linfen BranchTaiyuan 041000ShanxiChina

dynamic behavior of coalbed methane (cbm) flow will provide the theoretical basis to optimize production performance for a given well.A mathematical model is developed to simulate flowing pressures and pressure drops of cbm column from well head to bottom *** measured parameters and independent variables of flow rates,flowing pressures and temperatures are involved in cbm producing process along the *** developed relationships are validated against full-scale measured data in single-phase cbm *** proposed methodology can analyze the dynamic behavior in cbm reservoir and process of cbm flow with an overall accuracy of 2%.The calculating process of flowing pressures involves friction factor with variable Reynolds number and cbm temperature and compressibility factor with gravitational *** results showed that the effect of flowing pressure on cbm column was more obvious than that on cbm and water column accompanied by an increase of dynamic water *** ratios of flowing pressure on increment of cbm column to the whole column increased with the declined flow rates of water ***-hole pressure declined with the decreased flowing pressure of cbm column along the *** will lead to the results of the increased pressure drop of cbm column and cbm flow rate in single-phase cbm wellbores.

关键词： dynamic characteristic Single-phase cbm wellbore Flowing pressure of cbm column Flow rate of cbm column

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Experimental study of cryogenic treatment of Karaganda coal samples

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Petroleum Research 2024年第3期9卷 359-368页

作者： Lei Wang Nurzhan Yessenbayev Xinchuang Yan Iliyas Sarmalayev Minsu Cha Dichuan Zhang Randy D.Hazlett State key laboratory of Oil and Gas Reservoir Geology and Exploitation College of EnergyChengdu University of Technology610059China Engineering Research Center of Development and Management for Low to Ultra-Low Permeability Oil&Gas Reservoirs in West China Ministry of EducationXi'an Shiyou UniversityXi'an 710065China Petroleum Engineering Department Nazarbayev University010000Kazakhstan Department of Civil Engineering Jeju National University62343South Korea Department of Civil and Environmental Engineering Nazarbayev University010000Kazakhstan

Karaganda Coal Basin bears the largest undeveloped reserve of coalbed methane(cbm)in Kazakhstan,which lacks water resources for implementing large-volume hydraulic *** fracturing utilizing liquid nitrogen(LN_(2))has been trialled in fields and is a waterless fracturing technique under intensive research these *** study aimed to evaluate the cryogenic treatment efficacy of Karaganda coal samples as well as to understand the coal permeability evolution during the thawing period.X-ray fluorescent spectrometry(XRF)and microscope imaging identified the compositional and structural heterogeneities of coal specimens mined from different *** emission test,permeability measurement,and microscope imaging comparatively characterized the dry coal structure alteration before and after immersion into LN_(2).Cryogenic treatment slowed down the S-wave velocity through coal specimens,enhanced permeability by over 65%after temperature recovery as well as created new fractures,enlarged existing ones,and spalled coal *** permeability evolution against temperature rise during the thawing process has been successfully captured for the first ***,the experimental measurements support that the LN_(2) cryogenic fracturing technique would be effective in stimulating coalbeds for cbm production in Karaganda Coal Basin.

关键词： Cryogenic treatment Karaganda coal dynamic permeability Acoustic emission Microscopic image XRF composition

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