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| 1 | Stratum energy of coal-bed gas reservoir and their control on the coal-bed gas reservoir formation显示文摘Stratum energy of coal-bed gas reservoir, including coal-radix flexibility energy, groundwater flexibility energy and gas flexibility energy (hereinafter 'three energy'), depends on the energy homeostasis system, the core process of which is the effective transfer of energy and the geological selective process. Combining with the mechanics experimentations of coal samples, different flexibility energy has been analyzed and researched quantificationally, and a profound discussion to their controls on the coal-bed gas reservoir formation has been made. It is shown that when gas reservoir is surrounded by edge water and bottom water, the deposited energy in the early phase of forming gas reservoir is mostly coal-radix and gas flexibility energy, but the effect of groundwater flexibility energy increases while water-body increases. The deposited energy in the middle and later phase of forming gas reser voir is mostly gas flexibility energy, which is greater than 80% of all deposited energy. In the whole process, larger groundwater body exerts greater influences on gas accumulation. The paper indicated that higher stratum energy is more propitious to forming coal-bed gas reservoir. And higher coal-radix flexibility energy and gas flexibility energy are more propitious to higher yield of gas reservoirs, while higher groundwater flexibility energy is more propitious to stable yield of gas reservoirs. Therefore, the key to evaluating the coal-bed gas reservoir formation is the stratum energy of coal-bed gas reservoir. | WU CaiFang QIN Yong FU XueHai | 2007 | Science China Earth Sciences2007，50，9： | 9 |
| 2 | Self-adjusted elastic action and its CBM pool-forming effect of the high rank coal reservoir显示文摘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. | QIN Yong FU Xuehai WU Caifang FU Guoyou BU Yingying | 2005 | Chinese Science Bulletin2005，50，S1： | 9 |
| 3 | 胃食管反流病:内镜评估与治疗方面的革新显示文摘内镜技术的创新为胃食管反流病(GERD)的诊治带来了巨大进步。作为世界上最常见的胃肠疾病之一,GERD一直是内镜介入治疗的前沿。目前,GERD的初步诊断是基于症状和质子泵抑制剂(PPI)初期治疗有效,但这对治疗策略的指导价值有限。然而,内镜检查和病理活检可直接观察和判断食管的异常结构和病理生理损伤;同时,内镜治疗的出现给PPI治疗依从性较差或治疗反应不佳以及不适合行胃底折叠抗反流手术的患者提供了新的治疗选择。本综述对内镜检查和活检在经过恰当的抗反流药物治疗后持续存在GERD相关临床表现的患者中的应用情况进行了概述,并介绍了目前内镜治疗GERD的各项新技术及其优缺点。今后的研究需要对GERD患者进行分层研究,并力图阐明该疾病的主要病理生理机制。 | Sheng Chen Feng Du Changqing Zhong Caifang Liu Xiaoying Wang Yan Chen Gang Wang Xiaopei Gao Lu Zhang Lianyong Li Wei Wu | 2021 | Gastroenterology Report2021，9，5： | 4 |
| 4 | Interlayer interference mechanism of multi-seam drainage in a CBM well:An example from Zhucang syncline显示文摘Based on the characteristics of the strong volatility of physical property in vertical direction, high gas content, high resource abundance and large exploitation potentiality of coal reservoir in Bide-Santang basin of Zhina coal field, we study the generation mechanism of interlayer interference, propagation rules of reservoir pressure drop and influencing factors of gas productivity in CBM multi-seam drainage in the paper. On the basis of the actual production data of X-2 well of Zhucang syncline in Bide-Santang basin,by simulating the gas production process of a CBM well under the condition of multiple seam with COMET3 numerical simulation software, we analyze the influencing factors of gas productivity during the process of multi-seam drainage, and illuminate the interlayer interference mechanism of multiseam drainage. The results show that permeability, reservoir pressure gradient, critical desorption pressure and fluid supply capacity of stratum have great influence on gas productivity of multi-seam drainage while coal thickness has little influence on it. Permeability, reservoir pressure gradient and fluid supply capacity of stratum affect the propagation velocity of reservoir pressure drop and thereby affect the final gas productivity. Moreover, the influence of critical desorption pressure on gas productivity of multiseam drainage is reflected in the gas breakthrough time and effective desorption area. | Jiang Wei Wu Caifang Wang Qiao Xiao Zhenghui Liu Yang | 2016 | International Journal of Mining Science and Technology2016，26，6： | 3 |
| 5 | Effective migration system of coalbed methane reservoirs in the southern Qinshui Basin显示文摘Effective migration system of coalbed methane(CBM)reservoir,which was controlled by development degree and opening-closing degree of fractures,determines the permeability of coal reservoir and can be characterized by the pore-fracture system in the extrinsic form.In this paper,based on coal matrix elastic self-regulating effect theory and coal reservoir combined elastic energy theory,the fracture opening-closing degree parameterΔand the fracture development degree parameterξare suggested for the quantitative study of the effective migration system of CBM reservoir in southern Qinshui Basin.Further,the control functions ofξandΔto CBM enrichment and high production are discussed.The results show that in present stage the area with highξvalue is located in Anze and Qinyuan,and then Zhengzhuang and Fangzhuang,where fracture development degree is high.The area with highΔvalue is located in Zhengzhuang and Fanzhuang,and then Anze and Qinyuan,indicating where coal matrix elastic self-regulating positive effect dominates and fractures tend to be open.Through the comprehensive analysis onξandΔ,it can be found that their best match area is located in Zhengzhuang and Fanzhuang,with high values for fracture development degree and opening-closing degree probably bringing about high fluid pressure and good permeability of reservoirs,which are advantageous to an abundant CBM production. | WU CaiFang QIN Yong ZHOU LongGang | 2014 | Science China Earth Sciences2014，57，12： | 1 |
| 6 | Application of auto-adapting neural networks in forecasting gas content with geological factors显示文摘 | Wu Caifang Zeng Yong Zhang Zixu | 2003 | Journal of Liaoning Technical University:Natural Science2003，22，5： | 1 |
| 7 | Application of The Third Theory of Quantification in Coal and Gas Outburst Forecast 显示文摘 | WU Caifang QIN Yong ZHANG Xuliang | 2004 | Journal of Coal Science and Engineering2004，10，2： | 1 |
| 8 | Morphology and Propagation of Hydraulic Fractures for CBM Wells显示文摘Objective As the most widely used and effective technique in reservoir reconstruction of unconventional natural gas,hydraulic fracturing has been achieved good effect in CBM development.It is important to note that coal seam is both source rock and reservoir,and that | WU Caifang ZHANG Xiaoyang | 2017 | Acta Geologica Sinica(English Edition)2017，91，5： | 0 |
| 9 | Combined control of fluid adsorption capacity and initial permeability on coal permeability显示文摘The variations of strain and permeability of coal were systematically studied through the physical simulation of N2 and water injection.The effects of fluid adsorption capacity and initial permeability on strain,permeability and the dominant effect of pore pressure were discussed.The adsorption strain and strain rate of coal during water injection are significantly higher than those during N2 injection.An edge of free adsorption exists in the early phase of N2 and water injection,which is related to fluid saturation.Within this boundary,the strain rate and pore pressure are independent.Moreover,the injec-tion time of initial stage accounts for about 20%of the total injection time,but the strain accounts for 70%of the total strain.For water injection,this boundary is about half of water saturation of coal.Besides,the influence of pore pressure on permeability is complex,which is controlled by adsorption capacity and initial permeability of coal.When the initial permeability is large enough,the effect of adsorption strain on permeability is relatively weak,and the promoting effect of pore pressure on fluid migration is dominant.Therefore,the permeability increases with increasing pore pressure.When the initial permeability is relatively low,the pore pressure may have a dominant role in promoting fluid migration for the fluid with weak adsorption capacity.However,for the fluid with strong adsorption capacity,the adsorption strain caused by pore pressure may play a leading role,and the permeability reduces first and then ascends with increasing pore pressure. | Xiaolei Liu Jianping Wei Guoying Wei Caifang Wu Cao Liu Xiaoming Ni | 2022 | International Journal of Coal Science & Technology2022，9，6： | 0 |
| 10 | Experimental study on the coupling effect of pore-fracture system and permeability controlled by stress in high-rank coal显示文摘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 problem.To 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 pressure.Stress sensitivity experiments under different effective stresses were conducted to systematically study the stage variation characteristics of porosity and permeability of coal.The results show that the permeability decreases exponentially with the increase in effective stress,consistent with previous studies.However,the porosity shows a V-shaped trend,which is different from the traditional understanding that it would decrease continuously with rising effective stress.These 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 strong.When 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 stress.Finally,suggestions are proposed for the drainage scheme of CBM wells based on the experimental results. | Jiang HAN Caifang WU Lu CHENG | 2023 | Frontiers of Earth Science2023，17，1： | 0 |
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