Water Absorption Characteristics And Their Influence On The Mechanical Properties Of Longmaxi Formation Shale In Northeastern Chongqing,
2020
National and Local Joint Engineering Research Center for Shale Gas Exploration and Development, Chongqing 401120, China; Key Laboratory of Shale Gas Resources Exploration of Natural Resources Department, Chongqing 401120, China；Shunan Gas Mine Field, Southwest Oil and Gas Field Company, PetroChina, Luzhou 646000, China
Water Absorption Characteristics And Their Influence On The Mechanical Properties Of Longmaxi Formation Shale In Northeastern Chongqing, Liu Hong, Xu Fenglin, Chen Qiao, Zhu Honglin, Su Degui, Feng Kelai
Coal Geology & Exploration
A certain amount of casing deformation occurs during the shale reservoir fracturing. There is a certain amount of clay minerals in shale, and after contacting with water-based fracturing fluid, it will show the same expansion characteristics and strength weakening effect as mudstone, which will increase the casing external load. Aiming at the Longmaxi Formation shale in the northeast of Chongqing, the self-absorption and swelling characteristics of shale under different solution systems are studied by physical experiments to analyze the effect of shale hydration on its rock mechanical properties. The results show that the water absorption of shale has a logarithmic …
Reasons Of Low Yield And Stimulation Measures For Cbm Wells In Junlian Area,
2020
Integration Center of Exploration and Development, Zhejiang Oilfield Company, Hangzhou 310023, China
Reasons Of Low Yield And Stimulation Measures For Cbm Wells In Junlian Area, Li Ying, Zheng Rui, Luo Kai, Zhu Yanming, Zhang Yimin
Coal Geology & Exploration
Coalbed methane fields in Junlian area have good development potential, but the existence of a large number of low-production and low-efficiency wells has restricted the increase of productivity. This paper analyzes the coupling relationship between high-productivity wells and geological factors from the perspective of geological engineering integration, analyzes the causes of inefficient wells from three aspects of geology, drainage and engineering, and evaluates the corresponding reform measures. The results show that the formation of inefficient wells in the north and the west of the study area is mainly affected by gas-bearing properties, fault distribution, production horizons, production and drainage rhythms, …
Development Characteristics Of Freezing Temperature Field Of Coastal Soft Soil Strata,
2020
School of Civil Engineering, Fujian University of Technology, Fuzhou 350118, China; Key Laboratory of Underground Engineering, Fujian Province University, Fuzhou 350118, China
Development Characteristics Of Freezing Temperature Field Of Coastal Soft Soil Strata, Chen Junhao, Zhuang Yan, Chen Bijian, Zhao Zhenwei, Wang Qiyun
Coal Geology & Exploration
In order to research the temperature fields and development law of freezing in the construction of connected aisle in coastal soft soil stratum, based on connected aisle between Luoxiu road station and Baise road station of Shanghai subway Line 15, the thickness and average temperature of frozen curtain, and the freezing process were analyzed. The temperature fields and development law of freezing were predicted by the three-dimensional numerical model of the connected aisle and the temperature data which were analyzed. The results show that the inherent pressure in soft soil causes initial pressure in the pressure relief hole. A lot …
Collapse Column Identification Method Based On Seismic Waveform Indication Inversion And Its Application,
2020
BGP Geological Research, CNPC, Zhuozhou 072750, China
Collapse Column Identification Method Based On Seismic Waveform Indication Inversion And Its Application, Wan Zhaofei, Guo Zenghu, Wang Peng, Tang Meizhen, Han Tianbao, Liu Liangqiong
Coal Geology & Exploration
During the CBM exploration and development, the collapse column is one of the important factors restricting the exploration effectiveness of coalbed methane. Therefore, the effective identification of collapse column is of great significance for the improvement of CBM exploration. The previous identification methods are based on the discontinuity of the in-phase axis of seismic reflection caused by collapse column. In this paper, the collapse column is innovatively regarded as a kind of geological anomaly, and the identification and prediction of the collapse column are attempted by means of waveform indication inversion. Firstly, through the analysis of logging data and geological …
Experimental Study On The Frequency Dispersion Response Of Composite Electrical Properties Of Coal,
2020
College of Computer Science and Technology, Henan Polytechnic University, Jiaozuo 454003, China
Experimental Study On The Frequency Dispersion Response Of Composite Electrical Properties Of Coal, Meng Hui, Li Jian, Lei Dongji, Wang Yajuan
Coal Geology & Exploration
In order to study the characteristics of frequency dispersion response of the composite electrical properties of coal, the real part R and imaginary part X of the composite resistance of coal body at different direction in different measured areas were measured, the frequency dispersion characteristics were analyzed, different classical models were used to conduct data inversion and comparison. The results show that the composite electrical property parameters(absolute value of R and X) of coal are inversely proportional to the measured area, the characteristic frequency points are not offset, the X-frequency divergence decreases with the increase of measurement area; …
Research Status And Prospect Of Drill Pipe Thread Used In Coal Mine,
2020
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710078, China
Research Status And Prospect Of Drill Pipe Thread Used In Coal Mine, Tian Dongzhuang, Chen Yanyu, Li Qing, Dong Mengmeng, Mou Peiying
Coal Geology & Exploration
Drill pipe is one of the main device for drilling construction of gas drainage, water detection and drainage and geological exploration. Due to complicated force conditions and using environment of drill pipe, accidents in boreholes caused by the failure of drill pipe threads are common. According to different structural classification, the characteristics of drill pipe thread structure in coal mines are introduced in detail; the current research status of thread stress distribution and failure analysis of thread are summarized. The research methods of thread stress distribution mainly include analytical method, finite element method and test method. The main causes of …
Table Of Contents,
2020
China Coal Technology and Engineering Group (CCTEG)
Layer-Penetrating Staged Fracturing Law Of Horizontal Wells Within Roof Of Coal Seams Under Stress Interference,
2020
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Layer-Penetrating Staged Fracturing Law Of Horizontal Wells Within Roof Of Coal Seams Under Stress Interference, Xu Yaobo
Coal Geology & Exploration
Layer-penetrating fracturing is the key link to improve production in horizontal well within roof, and stress interference has important influence on layer-penetrating segmental fracturing effect in the horizontal well within roof. Therefore, the layer-penetrating segmental fracturing numerical model of horizontal well within roof is set up, the influence law of fracture propagation on stress interference to layer-penetrating segmental fracturing is studied. The results show that:the rock mechanics parameters, the interval distance and the fracturing construction method are the three important factors affecting the intersegment disturbance of the horizontal well within roof. As the Poisson's ratio of the coal seam goes …
Multi Frequency Perspective Fine Detection Of Radio Wave For Thin Coal Areas In Fully Mechanized Coal Face,
2020
school of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China; Key Laboratory of Mine Geological Disaster Prevention and Environment Protection of Anhui Higher Education Institutes, Huainan 232001, China; State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Huainan 232001, China
Multi Frequency Perspective Fine Detection Of Radio Wave For Thin Coal Areas In Fully Mechanized Coal Face, Wu Rongxin, Shen Guoqing, Wang Hanqing, Xiao Yulin
Coal Geology & Exploration
The large area of thin coal area in the fully mechanized coal mining face is difficult to be detected accurately by the single frequency perspective detection of radio wave, which seriously affects the efficient and safe production of coal face. In order to detect the occurrence of thin coal area more precisely, a method of multi frequency perspective detection of radio wave is put forward. Taking coalface 1610A of Zhangji mine of Huaihe Energy Group as the research object, according to the geological conditions, four frequency(0.088, 0.158, 0.365 and 0.965 MHz) perspective detection are selected to delineate the thin coal …
Development And Application Of Lightweight Underground Drill Rig,
2020
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Development And Application Of Lightweight Underground Drill Rig, Fan Dong, Wang Ruize, Tian Hongliang, Chang Jianghua
Coal Geology & Exploration
The underground drill rig is too heavy, so it is difficult to move and transport in the roadway with poor conditions. In order to solve the problem, ZDY1200G lightweight underground drill rig with 5052-h38 state high strength aluminum alloy as the main material is developed. The idea of light structure design and modular assembly is adopted, combined with the application of light materials. The maximum weight of single component after quick disassembly of the drill rig is 292.5 kg. The three-dimensional DIC speckle system was used to measure and analyze the strain and displacement of the aluminum alloy feed body …
Summary Of Water Disaster Characteristics And Water Prevention And Control Technology In Open-Pit Coal Mines In China,
2020
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Summary Of Water Disaster Characteristics And Water Prevention And Control Technology In Open-Pit Coal Mines In China, Huang Xuanming, Zhang Yan, Li Wensong, Tian Zenglin
Coal Geology & Exploration
Opencast mining is one of the two ways of coal mining in China. Similar to the underground coal mine, the open-pit coal mine also faces the problem of water prevention and control in the process of mining. Due to the relatively single type of water disaster in open-pit coal mines in China, domestic scholars have conducted in-depth study on the characteristics of water disaster and water control technology. Based on the distribution of open-pit coal mines in China, this paper analyzes the characteristics of water hazards in open-pit coal mines from three aspects of water filling source, water filling channel …
Water Cutoff Curtain Technology Of Open-Pit Coal Mine Based On Low Strength Impermeable Concrete,
2020
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China; Shaanxi Key Laboratory of Coal Mine Water Hazard Prevention and Control Technology, Xi'an 710077, China
Water Cutoff Curtain Technology Of Open-Pit Coal Mine Based On Low Strength Impermeable Concrete, Cao Haidong, Miao Hechao, Chi Zan, Gao Sihua
Coal Geology & Exploration
The concrete underground continuous wall has the advantages of convenient construction, reliable quality, good impermeability and so on. It is widely used in water conservancy, hydropower, foundation pit support, subway and other impermeability projects. The materials used are both plastic concrete and rigid concrete. In the water-cutting curtain project of an open-pit coal mine in Inner Mongolia, according to its engineering geological and hydrogeological characteristics, a kind of low-strength(8-10 MPa) impermeable(P6 grade) concrete was developed as the wall casting material, which water/cementitious materials ratio is 0.68, sand ratio is 45%, For 1 m3 of concrete, the content of each …
Technology Of High Pressure Jet Grouting Water Cutoff Curtain In Gravel Aquifer,
2020
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Technology Of High Pressure Jet Grouting Water Cutoff Curtain In Gravel Aquifer, Zhu Mingcheng, Han Qiang, Zhao Guibin, Liu Yuzhu
Coal Geology & Exploration
The high-pressure jet grouting pile is mainly suitable for the muddy soil, cohesive soil, silt, sand, loess and gravelly soil, but it is seldom used in the gravel stratum or under the dynamic water condition. A water cutoff certain in an open-pit coal mine was constructed by using RJP method, and the high pressure jet grouting technique was successfully applied to gravel aquifer. Based on the pile test and screening test, the influence of gravel layer characteristics on the size of pile diameter was analyzed. The results show that the RJP method had good effect and reliable quality in the …
Properties Of The Occluded Pile Curtain Material Under Low Temperature And Dynamic Water Condition In Deep And Thick Gravel Layer,
2020
Dayan Company of China Energy Investment Corporation, Hulun Buir 021122, China
Properties Of The Occluded Pile Curtain Material Under Low Temperature And Dynamic Water Condition In Deep And Thick Gravel Layer, Peng Wei, Wang Hai, Wang Zhongquan, Bu Guiling
Coal Geology & Exploration
In order to reduce the water drainage of the studied open-pit mine, a curtain wall is proposed to cut off the river supply on the north side. With full consideration of the realities of construction site, the occluded pile curtain method is applied in an areas with a high voltage line overhead. The gravel layer thickness of the construction area is 45 m and the permeability coefficient is up to 100 m/d, with 0.033 hydraulic gradient and 5℃ groundwater temperature maintained for a long time. In order to ensure fast pile formation in deep gravel layer and low temperature dynamic …
Inspection Method And Analysis Of The Effect Of Water Cutoff Curtain In Open-Pit Coal Mine,
2020
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China; Shaanxi Key Laboratory of Coal Mine Water Hazard Prevention and Control Technology, Xi'an 710077, China
Inspection Method And Analysis Of The Effect Of Water Cutoff Curtain In Open-Pit Coal Mine, Wang Hai, Peng Wei, Cao Haidong, Wang Li
Coal Geology & Exploration
In order to reduce the water drainage of the studied open-pit mine, a curtain wall was constructed to cut off the river supply on the north side. According to the site construction conditions, four technologies were applied to construct the water cutoff curtain, such as the low-strength impermeable concrete underground continuous wall, HDPE impermeable film, ultra-high pressure angular variable speed jet grouting, and occluding pile. To test the effect of water cutoff curtain in the open-pit coal mine during construction, four surrounding well tests were carried out for three kinds of water cutoff curtain technologies, including low-strength impermeable concrete underground …
Relationship Between Ndvi And Hydromet Factors In Grassland Area Of Open-Pit Coal Mine,
2020
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Relationship Between Ndvi And Hydromet Factors In Grassland Area Of Open-Pit Coal Mine, Zhang Yan, Huang Xuanming, Chen Shi, Shi Bingxing
Coal Geology & Exploration
The groundwater level of an open-pit coal mine in the grassland area of the east Inner Mongolia has been decreasing continuously under the condition of long-term drainage. In order to study whether the growth of vegetation around the mining area was affected by the decline of groundwater level, the NDVI method was used to analyze the change trend of vegetation index in the study area from 2013 to 2019. Based on the joint entropy theory, the mutual information between NDVI and different meteorological and hydrological elements(temperature, rainfall and groundwater depth)were calculated, and the main influencing factors of vegetation growth were …
Genesis Analysis And Study On Tectonic Control On Water Of Huainan North China-Type Coal Field,
2020
Geological Exploration Engineering Department of Huainan Mining Group, Huainan 232052, China
Genesis Analysis And Study On Tectonic Control On Water Of Huainan North China-Type Coal Field, Ding Tongfu, Wang Minhua, Zhao Junfeng
Coal Geology & Exploration
In order to analyze deeply the genesis and tectonic control on water of the macrostructures of the fourth stage of the Huainan North China-type coalfield, the forms of folds and faults of the Huainan coalfield were used to verify and compare the North China craton geohistory, stratigraphy, and regional tectonics. Quantitative evaluation of the impact of mining area 8 on production mines was conducted. The results show that the Huainan coalfield was formed by the superposition of the Indosinian, Yanshan and Himalayan movements. The Indosinian movement formed the Huainan coalfield at near-east-west tectonic line(body) in the first stage, and the …
Geochemical Characteristics Of Elements In The Paleogene Yunlong Formation And The Restoration Of Paleoenvironment In Lanping Basin,
2020
Shaanxi Province 194 Coalfield Geology Co. Ltd., Tongchuan 727000, China
Geochemical Characteristics Of Elements In The Paleogene Yunlong Formation And The Restoration Of Paleoenvironment In Lanping Basin, Liu Xiaokang, Zhang Zhibo, Zhu Zhijun, Wu Chuanfu, Wei Xingxing, Liu Haiyan, Jin Tengrui, Baima Quzong
Coal Geology & Exploration
In order to restore the sedimentary environment of the Paleogene Yunlong Formation in the Lanping basin, inductively coupled plasma mass spectrometry(ICP-MS) was used to analyze trace elements in 13 samples of gypsum, limestone, gypsum mud, mudstone and sandstone from the Paleogene Yunlong Formation in Lanping Basin. The sedimentary environments and paleoclimate are estimated based on the spider diagram of trace elements in each lithology and the characteristics of the ratio of Cu/Zn, Sr/Cu and Sr/Ba and the content of Sr. The results show that:gypsum, limestone, gypsum mud, mudstone and sandstone are all rich in Rb, Pb, Zr; gypsum and gypsum …
Applicability Of Mercury Injection Test To The Characterization Of Low Rank Coal And Its Correction Method,
2020
China United Coalbed Methane United Co., Ltd., Beijing 100011, China
Applicability Of Mercury Injection Test To The Characterization Of Low Rank Coal And Its Correction Method, Liu Yinan, Liu Yong, Xin Fudong, Wei Hongyu
Coal Geology & Exploration
As an effective method for coal reservoir characterization, mercury intrusion has been widely used in reservoir property analysis of medium-high rank coal. However, for low-rank coal, due to its loose and brittle nature, the process of mercury intrusion will destroy the pore structure, resulting in poor applicability of mercury intrusion experiments. In order to accurately assess the damage to the pore structure of low-rank coal by mercury intrusion experiments, lignite and long flame coal were selected as the research objects, and the pore size distribution of coal was tested by mercury intrusion and nuclear magnetic resonance. The results show that …
Biogas Production And Variation Of The Chemical Composition Of The High Temperature Water Extract Of Lignite,
2020
The State Key Laboratory of Coal and Coalbed Methane Simultaneous Extraction, Jincheng 048000, China
Biogas Production And Variation Of The Chemical Composition Of The High Temperature Water Extract Of Lignite, Ren Hengxing, He Huan, Liu Fangjing, Wang Meilin, Guo Xin, Chen Linyong, Zhao Han, Yuan Xuefang, Guan Jiadong, Yue Lijiao
Coal Geology & Exploration
The interaction process between microorganism and coal is complicated. In order to deeply analyze the function and change rule of organic matter in coal in the process of biological gas production, taking Yima lignite and methanogens preserved in laboratory as research objects, the gas production characteristics of water-soluble organic matter of lignite and its chemical composition change before and after gas production were studied. The water-soluble organic components of Yima lignite obtained by deionized water extraction at 70℃ and the extraction residue were used as substrates for biogas production. High performance liquid chromatography-mass spectrometry (HPLC-MS), gas chromatography(GC) and gas chromatography-mass …
