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| 1 | Triple Medium Physical Model of Post Fracturing High-Rank Coal Reservoir in Southern Qinshui Basin显示文摘In this paper, influences on the reservoir permeability, the reservoir architecture and the fluid flow pattern caused by hydraulic fracturing are analyzed. Based on the structure and production fluid flow model of post fracturing high-rank coal reservoir, Warren-Root Model is improved. A new physical model that is more suitable for post fracturing high-rank coal reservoir is established. The results show that the width, the flow conductivity and the permeability of hydraulic fractures are much larger than natural fractures in coal bed reservoir. Hydraulic fracture changes the flow pattern of gas and flow channel to wellbore, thus should be treated as an independent medium. Warrant-Root Model has some limitations and can't give a comprehensive interpretation of seepage mechanism in post fracturing high-rank coal reservoir. Modified Warrant-Root Model simplifies coal bed reservoir to an ideal system with hydraulic fracture, orthogonal macroscopic fracture and cuboid matrix. Hydraulic fracture is double wing, vertical and symmetric to wellbore. Coal bed reservoir is divided into cuboids by hydraulic fracture and further by macroscopic fractures. Flow behaviors in coal bed reservoir are simplified to three step flows of gas and two step flows of water. The swap mode of methane between coal matrix and macroscopic fractures is pseudo steady fluid channeling. The flow behaviors of methane to wellbore no longer follow Darcy's Law and are mainly affected by inertia force. The flow pattern of water follows Darcy's Law. The new physical model is more suitable for post fracturing high-rank coal reservoir. | Shiqi Liu Shuxun Sang Qipeng Zhu Jiefang Zhang Hefeng Gao Huihu Liu Lixing Lin | 2015 | Journal of Earth Science2015，26，3： | 3 |
| 2 | Production characteristics and drainage optimization of coalbed methane wells: A case study from low-permeability anthracite hosted reservoirs in southern Qinshui Basin, China显示文摘 | Huihu Liu Shuxun Sang Michael Formolo Mengxi Li Shiqi Liu Hongjie Xu Shikai An Junjun Li Xingzhen Wang | 2013 | Energy for Sustainable Development2013，，： | 2 |
| 3 | Mi- crostrncture and texture of strip cast grain-oriented sili- con steel after symmetrical and asymmetrical hot rolling 显示文摘 | SONG Hongyu LU Huihu LIU Hal Tao | 2014 | Steel Research International2014，85，10： | 1 |
| 4 | Block scale investigation on gas content of coalbed methane reservoirs in southern Qinshui basin with statistical model and visual map显示文摘 | Liu Huihu Sang Shuxun Wang G G X | 2014 | Journal of Petroleum Science and Engineering2014，114，： | 1 |
| 5 | Growth characteristics and genetic types of pores and fractures in a high-rank coal reservoir of the southern Qinshui Basin显示文摘 | Liu Shiqi Sang Shuxun Liu Huihu | 2014 | Ore Geology Reviews2014，64，： | 1 |
| 6 | Evaluation of the synergetic gas-enrichment and higher-permeability regions for coalbed methane recovery with a fuzzy model显示文摘 | Huihu Liu Shuxun Sang Geoff G.X. Wang Yangmin Li Mengxi Li Shiqi Liu | 2012 | Energy2012，，1： | 1 |
| 7 | Geolog-ical controls over coal-bed methane well production in southern Qinshui basin 显示文摘 | Sang Shuxyn Liu Huihu Li Yangmin el al | 2009 | Procedia Earth and Plane- tary Science2009，1，1： | 1 |
| 8 | Efficient Semi‑Transparent Wide‑Bandgap Perovskite Solar Cells Enabled by Pure‑Chloride 2D‑Perovskite Passivation显示文摘Wide-bandgap(WBG)perovskite solar cells suffer from severe non-radiative recombination and exhibit relatively large opencircuit voltage(V_(OC))deficits,limiting their photovoltaic performance.Here,we address these issues by in-situ forming a well-defined 2D perovskite(PMA)_(2)PbCl_(4)(phenmethylammonium is referred to as PMA)passivation layer on top of the WBG active layer.The 2D layer with highly pure dimensionality and halide components is realized by intentionally tailoring the side-chain substituent at the aryl ring of the post-treatment reagent.First-principle calculation and single-crystal X-ray diffraction results reveal that weak intermolecular interactions between bulky PMA cations and relatively low cation-halide hydrogen bonding strength are crucial in forming the well-defined 2D phase.The(PMA)_(2)PbCl_(4)forms improved type-I energy level alignment with the WBG perovskite,reducing the electron recombination at the perovskite/hole-transport-layer interface.Applying this strategy in fabricating semi-transparent WBG perovskite solar cells(indium tin oxide as the back electrode),the V_(OC)deficits can be reduced to 0.49 V,comparable with the reported state-of-the-art WBG perovskite solar cells using metal electrodes.Consequently,we obtain hysteresis-free 18.60%-efficient WBG perovskite solar cells with a high V_(OC)of 1.23 V. | Liu Yang Yongbin Jin Zheng Fang Jinyan Zhang Ziang Nan Lingfang Zheng Huihu Zhuang Qinghua Zeng Kaikai Liu Bingru Deng Huiping Feng Yujie Luo Chengbo Tian Changcai Cui Liqiang Xie Xipeng Xu Zhanhua Wei | 2023 | Nano-Micro Letters2023，15，8： | 1 |
| 9 | Geological con- trois over coal-bed methane well production in southern Qinshui basin 显示文摘 | Sang Shuxun Liu Huihu Li Yangmin | 2009 | Procedia Earth and Planetary Science2009，1，1： | 1 |
| 10 | Evaluation of the synergetic gas-enrichment and higher-permeability regionsfor coalbed methane recovery with a fuzzy model显示文摘 | Liu Huihu Sang Shuxun Wang Geoff G X | 2012 | Energy2012，39，1： | 1 |
| 11 | Preparation of TiO2 microspheres with flower-like morphology through a water-in-oil emulsion route assisted by solvothermal treatment显示文摘 | Ying Chang Bei Liu Huihu Wang Chonggang Wu Ming Yan Shijie Dong | 2016 | Particuology2016，14，6： | 0 |
| 12 | Determination of representative elementary volume of digital coal based on fractal theory with X-ray CT data and its application in fractal permeability predication model显示文摘Representative elementary volume(REV)is the key to study the heterogeneity of digital coal and characterize its macroscopic and microscopic properties.The permeability evolution law of digital coal based on REV analysis can provide theoretical support for the application of permeability prediction model in multi-scale reservoirs.This study takes typical coal samples from Bofang and Sihe coal mines in Qinshui Basin as research object.First,the nondestructive information of two samples is scanned and visualized.Secondly,the calculation methods of two-dimensional(2D)and threedimensional(3D)fractal dimensions of pores and fractures are illustrated.Then,the determination methods of REV based on porosity and fractal dimension are compared.Finally,the distribution pattern of fractal dimension and porosity curves is studied,the relationship between 2D and 3D fractal dimension is characterized,and the application of fractal permeability model in permeability analysis of multi-scale reservoir is further discussed.The REV size varies greatly in different vertex directions of the same sample and between samples,so REV analysis can only be performed in specific directions.When the REV based on fractal dimension is determined,the porosity curve continues to maintain a downward trend and then tends to be stable.The 2D fractal dimension has a positive linear correlation with the 3D fractal dimension,and the porosity can be expressed as a linear function of the fractal dimension.The permeability through REV analysis domain is mainly affected by fractal dimension,dip angle,azimuth angle and maximum fracture length,which is of great significance for exploring permeability evolution law of coal reservoir at different scales.This study is of great significance for enriching the determination methods of REV in digital coal and exploring the permeability evolution law of multi-scale reservoirs. | Huihuang FANG Shuxun SANG Shiqi LIU Huihu LIU Hongjie XU Yanhui HUANG | 2022 | Frontiers of Earth Science2022，16，3： | 0 |
| 13 | 3D reconstruction of coal pore network and its application in CO_(2)-ECBM process simulation at laboratory scale显示文摘Three-dimensional(3D)reconstruction of the equivalent pore network model(PNM)using X-ray computed tomography(CT)data are of significance for studying the CO_(2)-enhanced coalbed methane recovery(CO_(2)-ECBM).The docking among X-ray CT technology,MATLAB,with COMSOL software not only can realize the 3D reconstruction of PNM,but also the CO_(2)-ECBM process simulation.The results show that the Median filtering algorithm enabled the de-noising of the original 2D CT slices,the image segmentation of all slices was realized based on the selected threshold,and the PNM can be constructed based on the Maximum Sphere algorithm.The mathematical model of CO_(2)-ECBM process fully coupled the expanded Langmuir equation.At the same time for CO_(2)injection,CH_(4)pressure tends to decrease with the increase of CO_(2)pressure,but its difference is not obvious.The CH_(4)pressure in the slice center changed a lot,while at the edge it changed a little under different CO_(2)pressures.The injected CO_(2)was transported to matrix along the macro and micro-fractures with continuous flow.The injected CO_(2)first replaced the adsorbed CH_(4)by covering the inner surface of macro-pores and meso-pores to form the single molecular layer adsorption of CO_(2).Then they migrated to micro-pores by Fick’s diffusion,sliding flow,and surface diffusion.Furthermore,the CO_(2)replaced CH_(4)adsorbed by volumetric filling in micro-pores,and formed the multi-molecular layer adsorption of CO_(2).The gas pressure and migration path between CO_(2)and CH_(4)are opposite.This study can provide a theoretical basis for studying digital rock physics technology and enrich the development of CO_(2)-ECBM technology. | Huihuang FANG Hongjie XU Shuxun SANG Shiqi Liu Shuailiang SONG Huihu LIU | 2022 | Frontiers of Earth Science2022，16，2： | 0 |
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