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Application of structural curvature of coalbed floor on cbm development in the Zaoyuan block of the southern Qinshui Basin

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Mining Science and Technology 2010年第6期20卷 886-890页

作者： SHEN Jian School of resources and Geosciences China University of Mining & Technology Xuzhou 221116 China key laboratory of cbm resources and dynamic accumulation process China University of Mining & Technology Xuzhou 221116 China

Based on controls of structural style and the position in coalbed methane (cbm) development, we used a method of curvatures to study its relations with cbm development parameters. We calculated structural curvatures of contours of the No.3 coal seam floor of the Shanxi Formation in the Zaoyuan block of the Qinshui Basin and analyzed its relations with development parameters of coalbed methane wells. The results show that structural curvature is negatively related to coal reservoir pressure, while positively related to permeability. With an increase in structural curvature, the average production of coalbed methane wells increases at first and then decreases, reaching the highest production at 0.02 m–1 of structural curvature. Therefore, structural cur-vature can be an important index for potential evaluation of coalbed methane development and provide a basis for siting coalbed methane wells.

关键词： coalbed methane structural curvature permeability production

Mechanical criterion for coal and gas outburst:a perspective from multiphysics coupling

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International Journal of Coal Science & Technology 2021年第6期8卷 1423-1435页

作者： Ting Liu Baiquan Lin Xuehai Fu Ang Liu School of Safety Engineering China University of Mining&TechnologyXuzhou 221116China key laboratory of cbm resources and dynamic accumulation process China University of Mining&TechnologyXuzhou 221008China Department of Energy and Mineral Engineering G3 Center and EMS Energy InstituteThe Pennsylvania State UniversityUniversity ParkPAUSA

Although a series of hypotheses have been proposed,the mechanism underlying coal and gas outburst remains *** the low-index outbursts encountered in mining practice,we attempt to explore this mechanism using a multiphysics coupling model considering the effects of coal strength and gas mass transfer on *** on force analysis of coal ahead of the heading face,a risk identification index C_(m)and a critical criterion(C_(m)≥1)of coal instability are *** to this criterion,the driving force of an outburst consists of stress and gas pressure gradients along the heading direction of the roadway,whereas resistance depends on the shear and tensile strengths of the *** results show that outburst risk decreases slightly,followed by a rapid increase,with increasing vertical stress,whereas it decreases with increasing coal strength and increases with gas pressure *** the response surface method,a coupled multi-factor model for the risk identification index is *** results indicate strong interactions among the controlling ***,the critical values of the factors corresponding to outburst change depending on the environment of the coal seams,rather than being *** the buried depth of a coal seam increases,the critical values of gas pressure and coal strength decrease slightly,followed by a rapid *** to its controlling factors,outburst can be divided into stress-dominated,coal-strength-dominated,gas-pressure-dominated,and multi-factor compound *** on this classification,a classified control method is proposed to enable more targeted outburst prevention.

关键词： Coal and gas outburst Critical criterion Multiphysics coupling Response surface method

A review on transport of coal seam gas and its impact on coalbed methane recovery

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Frontiers of Chemical Science and Engineering 2011年第2期5卷 139-161页

作者： Geoff G.X.WANG Xiaodong ZHANG Xiaorong WEI Xuehai FU Bo JIANG Yong QIN School of Chemical Engineering the University of QueenslandBrisbaneQld 4072Australia School of resources&Environment Henan Polytechnic UniversityJiaozuo 454000China School of Resource and Geosciences China University of Mining and TechnologyXuzhou 221008China key laboratory of cbm resources and dynamic accumulation process Ministry of Education of ChinaXuzhou 221008China

This paper presents a summary review on mass transport of coal seam gas(CSG)in coal associated with the coalbed methane(cbm)and CO_(2) geo-sequestration enhanced cbm(CO_(2)-Ecbm)recovery and current research advances in order to provide general knowledge and fundamental understanding of the cbm/Ecbm processes for improved cbm *** will discuss the major aspects of theory and technology for evaluation and development of cbm resources,including the gas storage andﬂow mechanism in cbm reservoirs in terms of their differences with conventional natural gas reservoirs,and their impact on cbm production *** paper summarizes the evaluation procedure and methodologies used for cbm exploration and exploitation with some recommendations.

关键词： mass transport coal seam gas(CSG) coalbed methane(cbm) coal cbm recovery carbon dioxide storage

The enrichment characteristics and geological controlling factors of coalbed methane occurrence in Laochang area, Yunnan Province

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Journal of Coal Science & Engineering(China) 2012年第4期18卷 355-361页

作者： WU Cai-fang CHEN Zhao-ying WANG Cong JIANG Wei School of resources and Geoscience China University of Mining&TechnologyXuzhou 221116China key laboratory of cbm and dynamic accumulation process Ministry of Education of ChinaXuzhou 221008China Qinshui Lanyan Coalbed Methane Co. Ltd.Jingcheng 048006China

The enriched characters of methane content in the main coal seam of Yunnan＇s Laochang coal mine was analyzed through combined with the geologic conditions of the research area： structure type, hydrogeology condition, coal reservoir＇s macerals, ash, water content, and so on. The geology factors of controlling gas in Laochang coal mine were illustrated; and the different geology models of controlling gas of geologic condition coupling were posed. Research shows that, in the region, the methane contents of the main coal seams decrease gradually from middle to all around it; the northeast and southeast is higher than the west. In the local area, the methane content of anticline axis is higher, and the gas content is reduced to both wings and plunging crown. On macroscopic view, the distribution of methane content in coal-beds was controlled by structural type. On microscopic view, the methane content in coal-beds is mainly involved in coal reservoir＇s macerals, ash content, and water content. The enriched characters of cbm in the research area are mainly the result of structure-hydrogeology-petrophysics coupling controls of cbm. On the basis of above analysis, according to the distribution character of methane content in coalbeds, the research area was divided into low gas area, middle gas area, and high gas area.

关键词： coalbed methane enrichment characteristics cotrolling factor Laochang area gas content geological condition

Optimization methods of production layer combination for coalbed methane development in multi-coal seams

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Petroleum Exploration and Development 2018年第2期45卷 312-320页

作者： YANG Zhaobiao ZHANG Zhengguang QIN Yong WU Congcong YI Tongsheng LI Yangyang TANG Jun CHEN Jie School of resources and Geosciences China University of Mining and TechnologyXuzhou 221116China key laboratory of cbm resources and dynamic accumulation process Ministry of Education of ChinaXuzhou 221008China Guizhou Research Center of Shale Gas and cbm Engineering Technology Guiyang 550009China

Based on the productivity equation of coalbed methane(cbm) wells, three indexes, main production layer optimization index, main production layer expansion index and capacity contribution index are proposed, with which the three-step optimization method of production-layer combination is established. In selecting main production layer, the coal seam thickness, cbm content, coal seam permeability, coal seam reservoir pressure and coal structure are considered comprehensively to evaluate the potential of the production layer. In selecting expansion of the main production layer combination, on the premise of ensuring full and slow desorption of the main production layer and non-exposure of the main production layer out of liquid surface, the degree of mutual interference between the main and non-main production layers is comprehensively evaluated by coupling the critical desorption pressure, layer spacing and reservoir pressure gradient difference. In optimizing production layer combination, the main concern is the economic efficiency of the combined layers. Only when the contribution coefficient of the main production layer is greater than 30% and the contribution index of the other production layers is more than 10%, the economic benefit of a cbm well after being put into production can be ensured. Based on the comparative analysis of the development effect of the development test wells in Songhe of Guizhou province, it is proved that the "three-step method" for the optimization of production-layer combination is scientific and practical, and can be used to design the multi-layer commingling scheme of coalbed methane.

关键词： cbm multi-layer commingled production selection of main production layer combination optimization production contribution

Prediction Model of Coal Reservoir Pressure and its Implication for the Law of Coal Reservoir Depressurization

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Acta Geologica Sinica(English Edition) 2019年第3期93卷 692-703页

作者： YAN Xinlu ZHANG Songhang TANG Shuheng LI Zhongcheng WANG Kaifeng YI Yongxiang DANG Feng HU Qiuping School of Energy and resources China University of GeoscienceBeijing 100083China MOE key lab of Marine Reservoir Evolution and Hydrocarbon accumulation Mechanism China University of GeoscienceBeijing 100083China Beijing key laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering Beijing 100083China China United Coalbed Methane Corporation Ltd. Beijing 100011China

The main methods of coalbed methane(cbm)development are drainage and depressurization,and a precise prediction of coal reservoir pressure is thus crucial for the evaluation of reservoir potentials and the formulation of reasonable development *** work established a new reservoir pressure prediction model based on the material balance equation(MBE)of coal reservoir,which considers the self-regulating effects of coal reservoirs and the dynamic change of equivalent drainage area(EDA).According to the proposed model,the reservoir pressure can be predicted based on reservoir condition data and the actual production data of a single *** with traditional reservoir pressure prediction models which regard EDA as a fixed value,the proposed model can better predict the average pressure of ***,orthogonal experiments were designed to evaluate the sensitivity of reservoir parameters on the reservoir pressure prediction results of this proposed *** results show that the saturation of irreducible water is the most sensitive parameter,followed by Langmuir volume and reservoir porosity,and Langmuir pressure is the least sensitive *** addition,the pressure drop of reservoirs is negatively correlated with the saturation of irreducible water and the Langmuir volume,while it is positively correlated with *** work analyzed the reservoir pressure drop characteristics of the cbm wells in the Shizhuangnan Block of the Qinshui Basin,and the results show that the cbm reservoir depressurization can be divided into three types,i.e.,rapidly drop type,medium-term stability type,and slowly drop *** drainage features of wells were reasonably interpreted based on the comprehensive analysis of the reservoir depressurization type;the latter was coupled to the corresponding permeability dynamic change characteristics,eventually proving the applicability of the proposed model.

关键词： coalbed methane pressure prediction equivalent drainage area influencing factors pressure drop types Qinshui Basin

Thermodynamic prediction and experimental investigation of short-term dynamic membrane formation in dynamic membrane bioreactors:Effects of sludge properties

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Journal of Environmental Sciences 2019年第3期31卷 85-96页

作者： Zhenzhen Yu Yisong Hu Mawuli Dzakpasu Xiaochang C.Wang key lab of Northwest Water Resource Environment and Ecology MOE Xi'an University of Architecture and Technology International Science & Technology Cooperation Center for Urban Alternative Water resources Development key lab of Environmental Engineering Shaanxi Province

In dynamic membrane bioreactors(DMBRs), a dynamic membrane(DM) forms on a support material to act as the separation membrane for solids and liquids. In this study, batch filtration tests were carried out in a DMBR using nylon mesh(25 μm) as support material to filtrate sludge suspensions of variable properties from three different sources to evaluate the effects on the short-term DM formation process(within 240 min). Furthermore, the extended Derjaguin–Landau–Verwey–Overbeek(XDLVO) theory was applied to analyze the sludge adhesion and cohesion behaviors on the mesh surface to predict quantitative parameters of the short-term DM formation process(including initial formation and maturation stage). The filtration results showed that the order of the initial DM formation time(permeate turbidity lability. Moreover, normal sludge(regarding settleability, dewaterability,flocculability, and extracellular polymeric substance) showed a more acceptable DM formation performance(short DM formation time, low permeate turbidity, and high permeate flux) than sludge with poor settleability, dewaterability and flocculability. The influence of sludge properties on the initial DM formation time corroborates the prediction of sludge adhesion behaviors by XDLVO theory. Additionally, the XDLVO calculation results showed that acid–based interaction, energy barrier, and secondary energy minimum were important determinants of the sludge adhesion and cohesion behaviors. Therefore, short-term DM formation process may be enhanced to achieve stable long-term DMBR operation through positive modification of the sludge properties.

关键词： dynamic membrane bioreactor dynamic membrane formation XDLVO theory Sludge properties Wastewater treatment

Characteristics of dissolved inorganic carbon in produced water from coalbed methane wells and its geological significance

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Petroleum Exploration and Development 2020年第5期47卷 1074-1083页

作者： YANG Zhaobiao QIN Yong QIN Zonghao YI Tongsheng LI Cunlei ZHANG Zhengguang key laboratory of Coalbed Methane resources and Reservoir Formation process Ministry of EducationChina University of Mining and TechnologyXuzhou 221008China School of Resource and Geosciences China University of Mining and TechnologyXuzhou 221116China Guizhou Research Center of Shale Gas and cbm Engineering Technology Guiyang 550009China

Based on long-term dynamic tracing of dissolved inorganic carbon(DIC)and stable carbon isotope(δ13CDIC)in produced water from 20 coalbed methane(cbm)wells in western Guizhou,the spatial-temporal dynamic variations ofδ13CDIC of the GP well group produced in multi-layer commingled manner were analyzed,and the relationship between the value ofδ13CDIC and cbm productivity was *** produced water samples of typical wells in the GP well group were amplified and sequenced using 16S rDNA,and a geological response model ofδ13CDIC in produced water from cbm wells with multi-coal seams was put *** research shows that:δ13CDIC in produced water from medium-rank coal seams commonly show positive anomalies,the produced water contains more than 15 species of methanogens,and Methanobacterium is the dominant *** dominant methanogens sequence numbers in the produced water are positively correlated withδ13CDIC,and the positive anomaly of v is caused by reduction of methanogens,and especially hydrogenotrophic *** segmentation of sedimentary facies and lithology in stratum with multi-coal seams will result in permeability and water cut segmentation,which will lead to the segmentation ofδ13CDIC and archaea community in produced water,so in the strata with better permeability and high water cut,theδ13CDIC of the produced water is abnormally enriched,and the dominant archaea is mainly *** the strata with weak permeability and low water cut,theδ13CDIC of the produced water is small,and the microbial action is *** shallow layer close to the coal seam outcrop is likely to be affected by meteoric precipitation,so theδ13CDIC of the produced water is *** geological response model ofδ13CDIC in produced water from multi-coal seams cbm wells in the medium-rank coal reveals the geological mechanism and microbial action mechanism of theδ13CDIC difference in the produced water from the multi-coal seams cbm *** also provides effect

关键词： coalbed methane produced water from coal seam dissolved inorganic carbon stable carbon isotope archaea community microbial gene cbm productivity geological response model

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Mechanism on simulation and experiment of pre-crack seam formation in stope roof

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Journal of Central South University 2014年第4期21卷 1526-1533页

作者：胡建华雷涛周科平刘浪劳德正 Hunan key lab of Mineral resources Exploitation and Hazard Control for Deep Metal Mines School of resources and Safety Engineering Central South University School of Civil and Resource Engineering University of Western Australia

The pre-crack blast technology has been used to control the induction caving area in the roof. The key is to form the pre-crack seam and predict the effect of the seam. The H-J-C blast model was built in the roof. Based on the theories of dynamic strength and failure criterion of dynamic rock, the rock dynamic damage and the evolution of pre-crack seam were simulated by the tensile damage and shear failure of the model. According to the actual situation of No. 92 ore body test stope at Tongkeng Mine, the formation process of the pre-crack blast seam was simulated by Ansys/Ls-dyna software, the pre-crack seam was inspected by a system of digital panoramic borehole camera. The pre-crack seam was inspected by the system of digital panoramic borehole in the roof. The results of the numerical simulation and inspection show that in the line of centers of pre-hole, the minimum of the tensile stress reaches 20 MPa, which is much larger than 13.7 MPa of the dynamic tensile strength of rock. The minimum particle vibration velocity reaches 50 cm/s, which is greater than 30-40 cm/s of the allowable vibration velocity. It is demonstrated that the rock is destroyed near the center line and the pre-crack is successfully formed by the large diameters and large distances pre-crack holes in the roof.

关键词： induction caving dynamic damage model pre-crack seam numerical simulation digital borehole camera