Damage Mechanism And Countermeasures Of Reservoir With Abnormal Pickup Of Cbm Flow Pressure In Well,
2019
Shanxi CBM Branch Company of Huabei Oilfield Company of Petrochina, Changzhi 046000, China
Damage Mechanism And Countermeasures Of Reservoir With Abnormal Pickup Of Cbm Flow Pressure In Well, Jia Huimin, Hu Qiujia, Qi Kongjun, Qin Mengfu, Mao Chonghao, Zhang Guangbo
Coal Geology & Exploration
The reasonable control of the casing pressure and the bottom-hole pressure and the reasonable depressurization of reservoir pressure is the key technology for the CBM development. The pickup of the bottom-hole flow pressure(BHFP) will restrain CBM' desorption, lead to reservoir permeability damage and reduce the production of CBM wells. Based on production practice of Fanzhuang block in Qinshui basin, this paper puts forward the cause of a CBM abnormal well type, pickup of the BHFP, clarifies the damage mechanism of the pickup of the BHFP through theoretical research and field data analysis, and puts forward the evaluating method of the …
Analysis And Application Of Key Influencing Factors Of Cbm Well Fracturing Effects In Shizhuang Area, Qinshui Basin,
2019
Jincheng Branch of China United Coalbed Methane Corporation, Jincheng 048000, China
Analysis And Application Of Key Influencing Factors Of Cbm Well Fracturing Effects In Shizhuang Area, Qinshui Basin, Xue Haifei, Zhu Guanghui, Wang Wei, Lu Xiaoxia, Wang Minghao, Wang Yanbin
Coal Geology & Exploration
CBM fracturing effect has many influencing factors. Development effect with the same technology is different in different area. Based on a large amount of geological and engineering data in Shizhuang block, it was found that high geo-stress affects fracture extension and support in CBM fracturing, and difference between horizontal stress affects fracture direction and morphology. Coal seam with poor coal structure can produce large amount of gum during fracturing, which will block the diversion channel and result in poor fracturing effect. Engineering factors affecting fracturing effect mainly include the fracturing fluids performance, displacement, prepad fluid proportion and hole enlargement ratio. …
Influence Of Internal Friction Angle On Damage Constitutive Model Of Freeze-Thaw Rock,
2019
College of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
Influence Of Internal Friction Angle On Damage Constitutive Model Of Freeze-Thaw Rock, Yuan Chao, Zhang Huimei, Meng Xiangzhen, Yang Gengshe, Wu Luyuan
Coal Geology & Exploration
Based on Weibull random distribution and damage mechanics theory, starting from the characteristics of rock deformation process, the Drucker-Prager criterion was used to establish a damage constitutive model that can reflect the characteristics of rock various deformation stages. Through the conventional triaxial compression test of frozen-thawed sandstone, the Mohr stress circle was used to obtain the cohesion and internal friction angle of the sandstone under different freeze-thaw cycles. The model theoretical curve and the test curve of freeze-thaw sandstone were compared to verify the model rationality. By varying the internal friction angle, whether the friction angle has an effect on …
Accurate Test Technology And Device For Coal Seam Gas Content In Long Boreholes In Underground Coal Mines,
2019
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Accurate Test Technology And Device For Coal Seam Gas Content In Long Boreholes In Underground Coal Mines, Sun Siqing, Zhang Qun, Long Weicheng, Zheng Kaige, Hei Lei
Coal Geology & Exploration
In order to get actual gas content of underground coal mine during large-scale advanced detection, the sealed coring method for gas content was proposed. The sealed coring device of "three-cylinders, single motion and ball valve sealing" suitable for accurate test of gas content of long boreholes in underground coal mines was designed and trial-produced, the outer diameter of the device is 89 mm, and the diameter of the coal core can reach 38 mm, the pressure holding capacity of the sealed coring device is above 11 MPa, which satisfies the requirement of sealing sampling for the determination of coal seam …
Geological Characteristics And High Efficiency Development Technology Of Coalbed Methane In Duijiangnan Coal Mine, Guizhou Province,
2019
China Coal Research Institute, Beijing 100013, China; Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Geological Characteristics And High Efficiency Development Technology Of Coalbed Methane In Duijiangnan Coal Mine, Guizhou Province, Gong Zewen
Coal Geology & Exploration
The development progress of coalbed methane in Duijiangnan mine field is slow. The main problems are low drilling efficiency, serious cementing leakage, long fracturing transformation period and low single well production in the block. Objectively evaluating the geological characteristics and development technology of coalbed methane is very im-portant for coalbed methane in the future. The coalbed thickness, coal body structure, reservoir pressure, gas content and permeability are systematically studied, combining with the past drilling, fracturing and drainage practices. It is proposed that directional wells are the main method of coalbed methane development in the coalfield. The coal seam M18 which …
Corrosion Behavior Analysis Of Sucker Rod For Coalbed Methane Wells In The Eastern Block Of Ordos Basin,
2019
Petrochina Coalbed Methane Company Limited, Beijing 100028, China; College of Mechanical and Electronic Engineering in China University of Petroleum(Huadong), Qingdao 266580, China
Corrosion Behavior Analysis Of Sucker Rod For Coalbed Methane Wells In The Eastern Block Of Ordos Basin, Pang Bin, Wang Hanxiang, Lan Wenjian
Coal Geology & Exploration
In order to make clear the corrosion rule of sucker rod for coalbed methane wells in the eastern block of Ordos basin, the paper summarizes the corrosion types and corrosion intensities of the sucker rod, based on the test of produced gas, produced water, corrosion products and weight loss of sucker rod. The paper analyzes the effect of different drainage stages, coal seam and mineralization degree of water on the corrosion. The results of the research indicate that corrosion is mainly caused by CO2 and H2S originated from No.5 coal seam and No.11 coal seam. The corrosion …
Study On Uniaxial Compression Mechanical Properties Of Sandstone With Different Moisture Content And Wave Velocity Method,
2019
Chongqing Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Chongqing 400039, China
Study On Uniaxial Compression Mechanical Properties Of Sandstone With Different Moisture Content And Wave Velocity Method, Duan Tianzhu, Ren Yaping
Coal Geology & Exploration
In order to investigate the mechanical properties and damage of sandstone under different uniaxial compression, the static uniaxial compression tests of five sandstones with different moisture content were carried out, and the physical and mechanical parameters were obtained. And the wave velocity of the sandstone samples with different moisture content were measured by ultrasonic detector. Then the sandstone was loaded to 80% peak intensity and then unloaded to 0. The acoustic wave velocity of sandstone was measured at this time. The damage was determined by acoustic wave method. The results show that the peak strength of sandstone under uniaxial compression …
A Method Of Random Noise Suppression Based On Compressed Sensing,
2019
Tarim Oilfield Company, PetroChina, Korla 841000, China; School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
A Method Of Random Noise Suppression Based On Compressed Sensing, Yang Liangang, Li Lingyun, Yang Yumei, Qu Yuanji, Yan Ke
Coal Geology & Exploration
With the development of high precision seismic exploration technology, the use of high fidelity methods to improve the SNR of seismic data becomes the key to denoising. Curvelet threshold method can effectively suppress random noise, but at the same time the method is easy to produce pseudo Gibbs shock phenomenon, resulting in local distortion of the signal, thus affecting the processing effect. To solve this problem, a method of seismic signal denoising based on compressing sensing(CS) is presented in this paper. The method uses the difference between sparse representation of random noise and effective signal in curvelet sparse domain to …
Channel Wave Advanced Detection Method Based On Kirchhoff Migration And Its Application,
2019
Jizhong Energy Xingtai Mining Group Co., Ltd., Xingtai 054000, China
Channel Wave Advanced Detection Method Based On Kirchhoff Migration And Its Application, Zhao Yunpei, Wang Wei, Hou Xianhua
Coal Geology & Exploration
In order to detect the geological structures in the front of the working face 1199 in Gequan mine of Xingtai mining area, underground channel wave seismic exploration was used to conduct advanced detection, linear Radon transform was used to extract the reflection wave from the front of the roadway, parameter information of the surrounding rocks were obtained through velocity analysis in time domain, The abnormal geological bodies in the front of the roadway were imaged through Kirchhoff migration. The results indicated that there existed anomalies at 205 m and 237 m away from the geophone point G12 in the front …
Shale Gas Potential Of Yanguanjie Formation And Longtan Formation In Central And Southeastern Hunan Province,
2019
Hunan Provincial Key Laboratory of Shale Gas Resource Utilization, Hunan University of Science and Technology, Xiangtan 411201, China
Shale Gas Potential Of Yanguanjie Formation And Longtan Formation In Central And Southeastern Hunan Province, Cao Taotao, Deng Mo, Liu Hu, Huang Yanran, Stefan Andrew Hurssthouse
Coal Geology & Exploration
In order to reveal the shale gas potential and exploration direction of the marine-continental transitional shale in central and southeastern Hunan, samples were collected from the Lower Carboniferous Yanguanjie Formation and Upper Permian Longtan Formation, measurements were conducted on TOC, Rran, kerogen carbon isotope, maceral composition, X-ray diffraction, scanning electron microscopy, porosity, permeability and methane sorption capacity. The results indicate that Yanguanjie Formation and Longtan Formation shale are at the mature stage, and mainly dominated by type Ⅲ kerogen. The Longtan shale generally has higher TOC content, while Yanguanjie shale has usually low TOC content. The minerals are …
Management Of National Planned Coal Mining Areas And Discrimination With Coal Mining Areas,
2019
China Coal Pingshuo Group Co., Ltd., Shuozhou 036006, China
Management Of National Planned Coal Mining Areas And Discrimination With Coal Mining Areas, Wang Xiangsheng, Wang Meng, Liu Jingchun
Coal Geology & Exploration
In view of the confusion between national planned coal mining areas and coal mining areas, based on the relevant standards and notices, the definitions of national planned coal mining areas and coal mining areas are interpreted in detail. This paper introduces the basic situation of the first and second batches of national planned coal mining areas and the《National Mineral Resources Planning (2016-2020)》. The differences between the two are expounded in detail from the aspects of delineation purpose, delimitation basis and formation period. It is pointed out that the competent department of national planned coal mining areas is the Ministry of …
Research And Application Of Cbm Surface Extraction Based On Coal Mine With “Gas Drainage First, Construction Later” And Resource Development,
2019
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Research And Application Of Cbm Surface Extraction Based On Coal Mine With “Gas Drainage First, Construction Later” And Resource Development, Wang Jing, Yao Tuanqi, Cheng Bin
Coal Geology & Exploration
Aiming at the safety index put forward by "gas drainage first, construction later" of coal mine at present and the resource characteristics of many coal seams in northern Guizhou Province, and at the same time making up for the lack of systematization and large blind area of surface gas drainage deployment at present, this paper took Duijiangnan coal mine as an example to carry out the research of coal bed methane surface drainage deployment. Based on the complex topographic conditions, coal seam development characteristic(multiple layers, thin thickness, group distribution), coal body structure, development and deployment requirements in this area, the …
Influencing Factors Of Surface Gas Extraction Effect In Wangpo Minefield Of Jincheng Mining Area,
2019
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Influencing Factors Of Surface Gas Extraction Effect In Wangpo Minefield Of Jincheng Mining Area, Du Zhiqiang
Coal Geology & Exploration
The effect of surface gas extraction in Wangpo minefield of Jincheng mining area is poor. In order to find out the causes and to guide the construction of future surface gas extraction, the occurrence conditions of CBM resources in the study area were analyzed and compared with those of adjacent Chengzhuang minefield where the extraction effect is good, the quality of the produced water was tested, at the same time the fracture forms were observed underground. The comprehensive analysis indicated that the abundance of coal gas resources and the reservoir conditions were the major intrinsic basic factors influencing the gas …
Coal Control Factors Of Middle Jurassic Shimengou Formation In Beidatan Area, East Part Of The Northern Qaidam Basin,
2019
Institute of Earth Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
Coal Control Factors Of Middle Jurassic Shimengou Formation In Beidatan Area, East Part Of The Northern Qaidam Basin, Peng Minghong, Tian Jingchun, Zhang Xiang, Chen Lei, Zeng Jianqiang, Wang Suying
Coal Geology & Exploration
The key of the coal exploration in Beidatan area of Qinghai Province is the coal accumulation environment in the sedimentary period and the control of coal seam occurrence by tectonic action before and after sedimentation. To identify Shimengou Formation coal controlling factors in Beidatan area, east part of the northern Qaidam basin, effectively guide the coal exploration of the coal bearing area, through field outcrops, drilling, geophysical prospecting and other geological information system, based on the analysis of coal accumulating environment and structural function of Shimengou Formation in Beidatan area, the control factors of coal were deeply discussed from coal …
Table Of Contents,
2019
China Coal Technology and Engineering Group (CCTEG)
Technology And Application Of Indirect Fracturing In Cbm Vertical Well Of Broken And Soft Coal Seam With Low Permeability,
2019
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Crop., Xi'an 710077, China
Technology And Application Of Indirect Fracturing In Cbm Vertical Well Of Broken And Soft Coal Seam With Low Permeability, Zhou Jiajia
Coal Geology & Exploration
In order to solve the problems of pulverized coal output and fracturing fracture not easy to extend during fracturing operation in the broken and soft coal seam with low permeability, the adaptability and fracturing fracture distribution of CBM during indirect fracturing are studied by means of in-situ stress and numerical simulation, and the engineering practice of indirect fracturing has been tested in Hongshandian mining area of Hunan Province. The results show that indirect fracturing can effectively improve the fracturing effect of the broken and soft coal seam with low permeability, and increase the fracture length. When the roof and floor …
Coalbed Methane Migration Mechanism Under Adsorption-Desorption Condition In Coal,
2019
Mine Safety Technology Branch, China Coal Research Institute, Beijing 100013, China; National Key Lab of Coal High Efficient Mining and Clean Utilization(China Coal Research Institute), Beijing 100013, China
Coalbed Methane Migration Mechanism Under Adsorption-Desorption Condition In Coal, Liu Yongqian, Zhang Shulin, Shu Longyong
Coal Geology & Exploration
The migration law of coalbed methane(CBM) with adsorption has always been the focus of attention in the field of coalbed methane geology. In order to study the mechanism of CBM migration under adsorption-desorption state, the deduction of gas adsorption-desorption equation and theoretical analysis of gas diffusion-seepage in porous media were carried out, and new viewpoints were put forward by means of experimental analysis of CBM migration. The results identified that:(1) for the CBM migration, pore structure of coal body has the storage-resistance effect, the dual functions of gas storage and gas pressure drop form the basic feature of coal matrix, …
Occurrence Of Antimony In Magmatic Intrusive Coal Seam: A Case Study From The Wolonghu Coal Mine, Huaibei Coalfield, China,
2019
Institute of Physical Science and Information Technology, Anhui University, Hefei 230601, China
Occurrence Of Antimony In Magmatic Intrusive Coal Seam: A Case Study From The Wolonghu Coal Mine, Huaibei Coalfield, China, Ou Jinping, Zheng Liugen, Wei Xiangping, Liu Sikui, Li Liyuan, Liu Meng, Huang Xiaoyu
Coal Geology & Exploration
In order to investigate the influence of magmatic alteration on the occurrence characteristics of antimony in coal seam, 12 samples of magmatic magma and coal were collected from Wolonghu coal mine in Huaibei coalfield, Anhui Province, and the content of Sb was determined by atomic fluorescence spectrometry(AFS). The coal quality parameters are analyzed. The results are as follows:the coal in Wolonghu magmatic intrusion area has the characteristics of ultra-low volatile matter, medium ash content and ultra-low sulfur content. And the main forms of sulfur in coal are organic sulfur and pyrite sulfur. Under the influence of magmatic hydrothermal solution, ash …
Analysis Of Reservoir Conditions Of Shale Gas In Middle Permian Wenbishan Formation In Fujian Province,
2019
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China; Fujian Administration of Coal Geology, Fuzhou 350005, China
Analysis Of Reservoir Conditions Of Shale Gas In Middle Permian Wenbishan Formation In Fujian Province, Chen Quanlin
Coal Geology & Exploration
This study is performed on the geological conditions of shale gas in Middle Permian Wenbishan Formation in Fujian Province. It is based on organic geochemistry, rock minerals and reservoir physical property after geology survey and drilling. The results indicate that kerogen is Ⅲ-type, organic carbon is usually between 1% to 2%, Rran is between 3.76% to 4.91% in the shale of Wenbishan Formation, and the shale is in the mature stage. The content of brittle minerals is generally low. The shale has medium porosity and extremely low permeability, the micro and meso-pores constitute the major space for gas adsorption. …
Water Inflow Law Of The First Working Face Based On Water Pre-Draining From Roof,
2019
Uxin Banner Mengda Mining Industry Co. Ltd., Uxin Banner, Wushenqi 017307, China
Water Inflow Law Of The First Working Face Based On Water Pre-Draining From Roof, Li Yongtao, Yang Jian
Coal Geology & Exploration
In order to establish water control technology system in Inner Mongolia-Shaanxi contiguous area, we carried out some researches(e.g. overburden failure law, hydrogeological conditions, prediction of water inflow and pre-drainage of roof water) in Nalinhe No.2 coal mine. The results showed that three methods(i.e. coring, drilling fluid leakage observation and borehole color TV detection) were used to explore water-conducting fracture zone(103.23 m), and the ratio of the height of the fractured zone to the mining height was 18.8. Water-conducting fracture zone could connect three aquifers, and the Zhiluo Formation bottom aquifer was the main aquifer threatening safety mining. Water inflow and …
