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Physical characteristics of high-rank coal reservoirs in different coal-body structures and the mechanism of coalbed methane production

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Science China Earth Sciences 2017年第2期60卷 246-255页

作者： ZHANG XiaoDong DU ZhiGang LI PengPeng School of Energy Science and Engineering Henan Polytechnic University Jiaozuo 454000 China Collaborative Innovation Center of coalbed Methane (Shale Gas) in Central Plains Economic Zone Jiaozuo 454000 China

The physical characteristics of coal reservoirs are important for evaluating the potential for gas desorption, diffusion, and seepage during coalbed methane （CBM） production, and influence the performance of CBM wells. Based on data from mercury injection experiments, low-temperature liquid nitrogen adsorption, isothermal adsorption, initial velocity tests of methane diffusion, and gas natural desorption data from a CBM field, herein the physical characteristics of reservoirs of high-rank coals with different coal-body structures are described, including porosity, adsorption/desorption, diffusion, and seepage. Geometric models are constructed for these reservoirs. The modes of diffusion are discussed and a comprehensive diffusion-seepage model is constructed. The following conclusions were obtained. First, the pore distribution of tectonically deformed coal is different from that of normal coal. Compared to normal coal, all types of pore, including micropores （〈10 nm）, transitional pores （10-100 nm）, mesopores （100-1000 nm）, and macropores （〉1000 nm）, are more abundant in tectonically deformed coal, especially mesopores and macropores. The increase in pore abundance is greater with increasing tectonic deformation of coal; in addition, the pore connectivity is altered. These are the key factors causing differences in other reservoir physical characteristics, such as adsorption/desorption and diffusion in coals with different coal-body structures. Second, normal and cataclastic coals mainly contain micropores. The lack of macropores and its bad connectivity limit gas desorption and diffusion during the early stage of CBM production. However, the good connectivity of micropores is favorable for gas desorption and diffusion in later gas production stage. Thus, because of the slow decline in the rate of gas desorption, long-term gas production can easily be obtained from these reservoirs. Third, under natural conditions the adsorption/desorption properties of granulated

关键词： high-rank coal coal-body structure Reservoir physical characteristics Gas production mechanism

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Experimental study on the coupling effect of pore-fracture system and permeability controlled by stress in high-rank coal

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Frontiers of Earth Science 2023年第1期17卷 135-144页

作者： Jiang HAN Caifang WU Lu CHENG Key Laboratory of coalbed Methane Resources and Reservoir Formation(Ministry of Education of China) China University of Mining and TechnologyXuzhou 221116China School of Resources and Geoscience China University of Mining and TechnologyXuzhou 221116China China United coalbed Methane Corporation Ltd.Beijing 100016China

During the coalbed methane(CBM)exploitation,the reservoir permeability can be affected by the effective stress that varies with the reservoir fluid pressure,which is a complex,dynamic and significant engineering *** analyze the response characteristics of the pore-fracture system by the changing stress,this work simulated reservoir and fluid pressures during the exploitation by adjusting confining pressure and displacement *** sensitivity experiments under different effective stresses were conducted to systematically study the stage variation characteristics of porosity and permeability of *** results show that the permeability decreases exponentially with the increase in effective stress,consistent with previous ***,the porosity shows a V-shaped trend,which is different from the traditional understanding that it would decrease continuously with rising effective *** variation characteristics(of porosity and permeability above)therefore result in a phased porosity sensitivity of coal permeability(PPS).Moreover,the stress sensitivity of the samples was evaluated using the permeability damage rate method(MPDR)and the stress sensitivity coefficient method(MCSS),both of which showed that it ranges from the degree of strong to extremely *** the effective stress is lower than 5–6 MPa,the stress sensitivity of the coal reservoir drops rapidly with effective stress rising;when it is higher than 5–6 MPa,the change in stress sensitivity tends to flatten out,and the stress sensitivity coefficient(CSS)goes down slowly with rising effective ***,suggestions are proposed for the drainage scheme of CBM wells based on the experimental results.

关键词： stress sensitivity porosity sensitivity permeability high-rank coal effective stress

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Characteristics of high-rank coal structure parallel and perpendicular to the bedding plane via NMR and X-ray CT

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Petroleum Science 2020年第4期17卷 925-938页

作者： Shi-Qi Liu Shu-Xun Sang Qiu-Jia Hu Hui-Huang Fang Low Carbon Energy Institute China University of Mining and TechnologyXuzhou 221008China Jiangsu Key Laboratory of coal-based Greenhouse Gas Control and Utilization China University of Mining and TechnologyXuzhou 221008China School of Mineral Resource and Geoscience China University of Mining and TechnologyXuzhou 221116China Key Laboratory of coalbed Methane Resources and Reservoir Formation Process Ministry of EducationChina University of Mining and TechnologyXuzhou 221008China Shanxi CBM Branch of Huabei Oilfeld Company China National Petroleum CorporationJincheng 048000China

Pores and fractures and their connectivity play a significant role in coalbed methane *** investigate the growth characteristics and connectivity of pores and fractures in coal parallel and perpendicular to the bedding plane,the pores and fractures of high-rank coal samples collected from the southern Qinshui Basin were measured by low-field nuclear magnetic resonance,X-ray-computed tomography and field emission scanning electron ***,the determinants of their connectivity were further *** results show that the high-rank coal samples have similar pore size distributions both parallel and perpendicular to the bedding *** primarily contain mesopores(2-50 nm in width),followed by macrospores(> 50 nm in width).The research indicated that the high-rank coal connectivity parallel to the bedding plane is significantly better than that perpendicular to the bedding *** connectivity of high-rank coal is mainly determined by throats,and the orientation of the pores and *** two connectivity modes in high-rank coal are "pore connectivity," in which the throats are mainly pores with a low coordination number,and "microfissure connectivity",in which the throats are mainly microfissures with a high coordination number.

关键词： Porosity Connectivity Pore width Microfissure high-rank coal Qinshui Basin

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Acoustic response characteristics and sensitivity of briquette and raw coal under temperature and pressure control

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Frontiers of Earth Science 2023年第1期17卷 170-179页

作者： Hewei ZHANG Jian SHEN Kexin LI Xiaojie FANG Ziwei WANG Lei DU Key Laboratory of coalbed Methane Resources and Reservoir Formation Process(Ministry of Education) China University of Mining and TechnologyXuzhou 221008China School of Resources and Geosciences China University of Mining and TechnologyXuzhou 221116China Huabei Oilfield CBM Branch Company Changzhi 046000China Shaanxi coalfield Geophysical Exploration and Mapping Co. Ltd.Xi᾽an 710000China

Acoustic testing is a widely used technique to measure the coal mechanical properties under high temperature and pressure in situ *** study compared the acoustic wave characteristics of briquette and raw coal under various temperature and pressure *** results show that the longitudinal wave velocity(Vp)decreases with an increasing vitrinite content.A large number of the vitrinite content enhances the process in which the temperature and pressure changed the *** Vp of briquette decreases approximately linearly with the temperature compared to raw *** Vp of raw coal experiences initially a rapid,then gradual,and finally the moderate increasing trend with the increase in confining ***,in briquette,the Vp increases approximately linearly with the confining *** results indicate that the Vp is more sensitive to temperature under low confining pressure and peaks at 50℃−60℃ than high confining ***,the Vp is less sensitive to temperature under higher confining pressure,and the positive effect of high confining pressure is *** the mechanical properties of coal under high pressure and temperature develops better insight into coalbed methane(CBM)exploration from deep reservoirs.

关键词： high-rank coal P-wave velocity temperature pressure microscopic components sensitivity

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Structure of different types of coal metamorphism by HTEM

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Mining Science and Technology 2010年第6期20卷 835-838页

作者： LI Xiaoming CAO Daiyong LIU Demin College of Safety Engineering North China Institute of Science and Technology Beijing 101601 China College of Geoscience and Surveying Engineering China University of Mining & Technology Beijing 100083 China

In order to discuss the effect of tectonic stress on the structural evolution of coal, given the importance attached to high-resolution Transmission Electron Microscopy (HTEM), we investigated several aspects of material structures of high-rank Carboniferous period coal, located in the northern foreland basin of the Dabie orogenic belt in eastern China. high powered crystal lattice images of Bright Fields (BF) and Selected Area Diffraction patterns (SAD) of different types of metamorphism in coal were obtained. The results show that the Basic Structural Units (BSU) become increasingly more compact as a function of rising tem-perature and pressure. Under pressure, the local orientation of molecules is strengthened, the arrangement of BSU speeds up and the degree of order is clearly enhanced.

关键词： Dabie orogenic belt high-rank coal high-resolution transmission electron microscopy tectonic stress

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