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2022

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Articles 91 - 120 of 612

Full-Text Articles in Mining Engineering

Stress Sensitivity Characteristics And Control Mechanism Of Different Coal Rank Reservoirs, Sun Fenjin, Yang Jiaosheng, Wang Meizhu, Sun Bin, Zhang Jidong, Zhao Yang, Deng Ze Sep 2022

Stress Sensitivity Characteristics And Control Mechanism Of Different Coal Rank Reservoirs, Sun Fenjin, Yang Jiaosheng, Wang Meizhu, Sun Bin, Zhang Jidong, Zhao Yang, Deng Ze

Coal Geology & Exploration

The stress sensitivity of coal reservoir reduces the permeability, which in turn affects the productivity of coalbed methane (CBM)wells. So how to reduce this effect from stress sensitivity deserves further study in the CBM wells drainage process. To clarify the stress sensitivity characteristic and differences of different rank coal reservoirs, coal samples collected respectively from Fanzhuang block (high rank coal), Baode block (medium rank coal) and Erlian Basin (low rank lignite) were employed in this study. The stress sensitivity experiments of different rank coal samples were systematically carried out during loading and unloading process. Meanwhile, stress sensitivity mechanism was analyzed. …

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Optimum Selection Of Favorable Areas For Multi-Layer Cbm Mining And Reservoir Characterstics In North Yunnan And Guizhou Exploration Area, Sun Bin, Tian Wenguang, Yang Zhaobiao, Yang Minfang, Li Cunlei Sep 2022

Optimum Selection Of Favorable Areas For Multi-Layer Cbm Mining And Reservoir Characterstics In North Yunnan And Guizhou Exploration Area, Sun Bin, Tian Wenguang, Yang Zhaobiao, Yang Minfang, Li Cunlei

Coal Geology & Exploration

Due to the abundance of coal-bearing synclines, multiple seams and high gas content, the exploration area in North Yunnan and Guizhou Provinces is an important expansion block in the periphery of Junlian County. Based on a large number of coalfield holes and test wells, the geological conditions of CBM are analyzed, and the optimization and evaluation method of multi-layer favorable area is established, i.e. multi-level fuzzy mathematics plus key indicators. Firstly, the evaluation model is constructed based on hierarchical optimization, and the key indicators are determined as co-mining coefficient, coal structure and gas content. The co-mining coefficient is composed of …

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Damage Mechanism Of Cbm Reservoirs And Double-Layered Screen Pipes In The Horizontal Well Completion, Xian Bao'an, Zhang Long, Ha Erheng Tu’Ersong, Yu Peng, Wang Kai, Zhang Yafei, Zhang Yang, Wang Sanshuai, Li Zongyuan Sep 2022

Damage Mechanism Of Cbm Reservoirs And Double-Layered Screen Pipes In The Horizontal Well Completion, Xian Bao'an, Zhang Long, Ha Erheng Tu’Ersong, Yu Peng, Wang Kai, Zhang Yafei, Zhang Yang, Wang Sanshuai, Li Zongyuan

Coal Geology & Exploration

Coal reservoirs have the characteristics of high adsorption, low permeability, easy compression and easy breakage. At the drilling and completing stage of horizontal coalbed methane wells, coal reservoir damage often occurs and leads to a significant reduction in coal seam permeability, thereby resulting in single well production. Through experimental analysis, the solid phase particles in drilling and completion fluids for horizontal well and the solid phase components induced by fluid flow are found to block the micro-fractures in the coal reservoir, and the damage mechanism for coal reservoir is elucidated to the drilling and completion reservoir of the horizontal well …

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Table Of Contents, The Editors Sep 2022

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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Coal Measures Superimposed Gas Reservoir And Its Exploration And Development Technology Modes, Sang Shuxun, Zheng Sijian, Yi Tongsheng, Zhao Fuping, Han Sijie, Jia Jinlong, Zhou Xiaozhi Sep 2022

Coal Measures Superimposed Gas Reservoir And Its Exploration And Development Technology Modes, Sang Shuxun, Zheng Sijian, Yi Tongsheng, Zhao Fuping, Han Sijie, Jia Jinlong, Zhou Xiaozhi

Coal Geology & Exploration

Coal measures superimposed gas reservoir is a key reservoir type of coal-measure gas in coal bearing formation. The discovery, exploration and development practice of coal measures superimposed gas reservoirs in China have opened up a new chapter for the coal-measure gas exploration. In this study, the concept, main types, development characteristics and occurrence distribution of coal measures superimposed gas reservoir are proposed and expounded. The formation prerequisite, accumulation process and reservoir forming mechanism of coal measure superimposed gas reservoir are analyzed. Specifically, the geological suitability exploration and development technology modes of two typical coal measures superimposed gas reservoirs are emphatically …

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Key Technology And Engineering Demonstration For Cascade Utilization Of Gas In Key Coal Mining Areas Of Shanxi Province, China, Li Guofu, Li Chao, Huo Chunxiu, Yan Zhiming, Zhang Diankun, Wang Chaoshuai, Wang Zheng Sep 2022

Key Technology And Engineering Demonstration For Cascade Utilization Of Gas In Key Coal Mining Areas Of Shanxi Province, China, Li Guofu, Li Chao, Huo Chunxiu, Yan Zhiming, Zhang Diankun, Wang Chaoshuai, Wang Zheng

Coal Geology & Exploration

The key coal mining areas of Shanxi Province, including Jincheng, Yangquan, Xishan, Fenxi and Lu’an, are the main implementation sites of the “13th Five-Year” national science and technology major project “Demonstration Project of Coordinated Development of Coalbed Methane and Coal in Key Coal Mining Areas of Shanxi”. Relying on the high-end platform of the national science and technology major project, a series of technologies for cascade utilization of coal mine gas have been developed and demonstrated to guide the enhancement of gas drainage and utilization from 6.02 billion m3 and 2.23 billion m3 in 2015 to 6.403 billion …

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Analysis On Influencing Factors Of Single/Multi-Layer Development Of Coalbed Methane Field: A Case Study Of Baode Block, Zhang Lei, Xu Fengyin, Li Ziling, Zhang Wei, Hou Wei, Zhang Qingfeng, Zhang Wen, Fan Hongbo, Li Yongchen Sep 2022

Analysis On Influencing Factors Of Single/Multi-Layer Development Of Coalbed Methane Field: A Case Study Of Baode Block, Zhang Lei, Xu Fengyin, Li Ziling, Zhang Wei, Hou Wei, Zhang Qingfeng, Zhang Wen, Fan Hongbo, Li Yongchen

Coal Geology & Exploration

Baode Block in the eastern margin of Ordos Basin is the first coalbed methane field of middle-low rank coal with 500 million cubic meters of production capacity constructed and reached in China, and it is also a benchmark in the coalbed methane industry there. During the development of Baode Block, good results are obtained by the commingled development of two sets of main coal layers, which are better than that of single-layer development. However, poor development result is obtained locally in the commingled development of some wells under the same development conditions, which is poorer than that of single-layer development. …

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Exploration Of Integrated Technology For Deep Coalbed Methane Drainage In Full Life Cycle: A Case Study Of Daning‒Jixian Block, Zeng Wenting, Ge Tengze, Wang Qian, Pang Bin, Liu Yinhua, Zhang Kang, Yu Lizhu Sep 2022

Exploration Of Integrated Technology For Deep Coalbed Methane Drainage In Full Life Cycle: A Case Study Of Daning‒Jixian Block, Zeng Wenting, Ge Tengze, Wang Qian, Pang Bin, Liu Yinhua, Zhang Kang, Yu Lizhu

Coal Geology & Exploration

The first deep coalbed methane (CBM) field with a depth of more than 2 000 meters in China has been proven in Daning‒Jixian Block on the eastern margin of Ordos Basin, where the deep coal bed has the characteristics of large buried depth, high pressure, high gas content, high gas saturation and low permeability. Besides, the features of early gas occurrence, high gas-liquid ratio and high salinity of produced liquid are shown in the production process. Problems such as corrosion, anti-eccentric wearing, gas locking and pump blocking were encountered in the application of suction pump based lifting system in the …

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Co2 Adsorption Of Anthracite With Different Moisture Contents And Its Implications For Geological Storage, Zhang Jinchao, Sang Shuxun, Han Sijie, Zhang Fengbi, Xu Ang, Liu Qishan Sep 2022

Co2 Adsorption Of Anthracite With Different Moisture Contents And Its Implications For Geological Storage, Zhang Jinchao, Sang Shuxun, Han Sijie, Zhang Fengbi, Xu Ang, Liu Qishan

Coal Geology & Exploration

CO2 geological storage in deep coal seams is regarded as an important pathway to achieve “2030 carbon peak and 2060 carbon neutrality goals”. The moisture content in coal seams plays a significant role in the CO2 storage capacity mainly based on CO2 adsorption. In this study, the anthracite from the Qinshui Basin was collected to conduct high-pressure CO2 adsorption isothermal experiments under dry, moisture-equilibrated and moisture-saturated conditions at 45℃. The CO2 excess adsorption curve was corrected by the reduction of CO2 dissolution. The adsorption capacity and adsorption heat were calculated using the modified D-R …

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Lithofacies And Sedimentary Environment Evolution Of The Shan2 3 Sub-Member Transitional Shale Of The Shanxi Formation In The Daning-Jixian Area, Eastern Ordos Basin, Sun Yue, Jiang Yuqiang, Xiong Xianyue, Li Xingtao, Li Shuxin, Qiu Zhen, Sun Xiongwei Sep 2022

Lithofacies And Sedimentary Environment Evolution Of The Shan2 3 Sub-Member Transitional Shale Of The Shanxi Formation In The Daning-Jixian Area, Eastern Ordos Basin, Sun Yue, Jiang Yuqiang, Xiong Xianyue, Li Xingtao, Li Shuxin, Qiu Zhen, Sun Xiongwei

Coal Geology & Exploration

The Shan2 3 Sub-member transitional facies shale of the Permian Shanxi Formation in the eastern margin of the Ordos Basin is a crucial target for future unconventional oil and gas exploration. Based on field outcrop observation, core description and thin-section identification, combined with X-ray diffraction, trace elements test and other analyses, four types of shale lithofacies were identified, including siliceous, siliceous-argillaceous, calcareous-siliceous (or siliceous-calcareous) and argillaceous lithofacies. The petrological characteristics and geochemical indicators show that the depositional environment of the Shan2 3 Sub-member inherited the epicontinental sea pattern with relatively gentle topography of the late Taiyuan Epoch. The …

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Construction Concept Of Integrated Geological Engineering Platform For Coalbed Methane, Li Guihong, Zhao Peipei, Wu Xinbo Sep 2022

Construction Concept Of Integrated Geological Engineering Platform For Coalbed Methane, Li Guihong, Zhao Peipei, Wu Xinbo

Coal Geology & Exploration

The production of coalbed methane (CBM) wells in China is generally low, and the CBM geological research is seriously divorced from the engineering, so it is urgent to introduce the idea of geological engineering integration, which is helpful to form a scientific engineering decision. In this paper, the idea of constructing a CBM geological engineering integration platform is proposed, and its business framework and function framework are built. Various professional software tools are integrated, such as Petrel for geological modeling, compass for drilling and completion design, MFrac for fracturing design, and CBM-SIM for reservoir numerical simulation. An integrated shared database …

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Stable-Production Period Prediction Method And Application In High-Rank Coalbed Methane Wells：A Case Study Of Fanzhuang-Zhengzhuang Block In Southern Qinshui Basin, Hu Qiujia, Jia Huimin, Zhang Cong, Fan Bin, Mao Chonghao, Zhang Qing Sep 2022

Stable-Production Period Prediction Method And Application In High-Rank Coalbed Methane Wells：A Case Study Of Fanzhuang-Zhengzhuang Block In Southern Qinshui Basin, Hu Qiujia, Jia Huimin, Zhang Cong, Fan Bin, Mao Chonghao, Zhang Qing

Coal Geology & Exploration

The prediction of stable-production period of Coalbed Methane (CBM) wells is of great significance to the prediction of reasonable stable gas rate and optimization of drainage strategy. Based on mass production data of different well types in Fanzhuang-Zhengzhuang Block, southern Qinshui Basin, the basic concepts of stable-production stage and period of CBM wells are clarified, and the empirical formula for the prediction of stable-production period is proposed and its influencing factors are analyzed. The results show that the CBM well keeps stable production by continuously reducing the bottom-hole-flowing pressure JHH, and the stable-production period is the time required for the …

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Reservoir Properties And Gas Production Difference Between No.15 Coal And No.3 Coal In Zhengzhuang Block, Southern Qinshui Basin, Zhang Cong, Li Mengxi, Feng Shuren, Hu Qiujia, Qiao Maopo, Wu Dingquan, Yu Jiasheng, Li Kexin Sep 2022

Reservoir Properties And Gas Production Difference Between No.15 Coal And No.3 Coal In Zhengzhuang Block, Southern Qinshui Basin, Zhang Cong, Li Mengxi, Feng Shuren, Hu Qiujia, Qiao Maopo, Wu Dingquan, Yu Jiasheng, Li Kexin

Coal Geology & Exploration

With the in-depth exploration and development of coalbed methane (CBM), the development differences between different strata in the same region are gradually emerging. Deepening the understanding of reservoir is crucial to formulate development strategies. Taking the Zhengzhuang Block in the southern Qinshui Basin as an example, in the past, the focus was on the main No.3 coal resources. With the stimulation demand in this block, the CBM needs to be gradually recovered in multiple layers. In this paper, the CBM resource of No.15 coal is analyzed. Comparative analysis with well developed No.3 CBM resources is carried to probe into the …

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Acid Fracturing Technology Of Deep Cbm Wells And Its Field Test In Daning-Jixian Block, Liu Changsong, Zhao Haifeng, Chen Shuai, Zhen Huaibin, Wang Chengwang Sep 2022

Acid Fracturing Technology Of Deep Cbm Wells And Its Field Test In Daning-Jixian Block, Liu Changsong, Zhao Haifeng, Chen Shuai, Zhen Huaibin, Wang Chengwang

Coal Geology & Exploration

There are abundant deep coalbed methane resources in China, but the coupling problem of coal reservoir reconstruction technology and deep geological quality conditions needs to be solved urgently. With Daning-Jixian Block as the geological background, the feasibility of volumetric fracturing is evaluated from the perspective of rock mechanical parameters of the No.8 coal seam in a deep layer of the block, and verified by the indoor triaxial acid fracturing model experiment, in order to explore the coal reservoir reconstruction technology under deep geological conditions. Based on the above basic research, the volume acid fracturing technology characterized by high displacement, low …

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Geosteering Technology And Application In Horizontal Wells For Coal Measure Tight Gas Reservoirs In The Areas Of Low Exploration Degree：Taking Dj-P37 Bore Field As An Example, Zhang Wen, Zhang Lei, Huang Li, Li Xiaogang, Shi Shi, Sun Xuedong, Zhao Longmei, Dai Ruirui, Tong Jiangnan Sep 2022

Geosteering Technology And Application In Horizontal Wells For Coal Measure Tight Gas Reservoirs In The Areas Of Low Exploration Degree：Taking Dj-P37 Bore Field As An Example, Zhang Wen, Zhang Lei, Huang Li, Li Xiaogang, Shi Shi, Sun Xuedong, Zhao Longmei, Dai Ruirui, Tong Jiangnan

Coal Geology & Exploration

In the 2D seismic area, the reservoir with a low well control degree, frontal sedimentary of the meandering river's delta and other complex lithology reservoirs, the drilling ratio of reservoirs is low when horizontal wells are implemented. The application of the geosteering technology combining the iterative updating of 3D geologic models and geologic-engineering integration has been gradually extensive. Multiple tight sandstone reservoirs, such as the Beichagou sandstone in the Shan2 3 Submember of the Shanxi Formation, develop in the Neopaleozoic coal measure at the southeastern margin of the Ordos Basin. Among them, the DJ-P37 bore field of the Daning–Jixian …

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Practice And Understanding Of Coalbed Methane Co-Production In Zhijin Area, Guizhou, Li Jiaxin, Chen Zhenlong, Guo Tao Sep 2022

Practice And Understanding Of Coalbed Methane Co-Production In Zhijin Area, Guizhou, Li Jiaxin, Chen Zhenlong, Guo Tao

Coal Geology & Exploration

Guizhou Province is a typical area where thin-to-medium thick coalbeds are developed, where the resource endowment characteristics, including multiple coalbeds, small thickness, low permeability, high in-situ stress and multi-layer superposition of pressure system, lead to the difficulties in localization of the mainstream technologies at home and abroad for the development of coalbed methane (CBM) and the utilization of CBM resources. The particularity of these geological characteristics of the multiple and thin CBM determines the obvious selectivity of technologies for its development, and thus the co-production of multiple coalbeds becomes the essential method for effective development and utilization of CBM resources …

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Out Of The Blue: Volcanic So2 Emissions During The 2021–2022 Eruptions Of Hunga Tonga—Hunga Ha’Apai (Tonga), S. A. Carn, N. A. Krotkov, B. L. Fisher, C. Li Sep 2022

Out Of The Blue: Volcanic So2 Emissions During The 2021–2022 Eruptions Of Hunga Tonga—Hunga Ha’Apai (Tonga), S. A. Carn, N. A. Krotkov, B. L. Fisher, C. Li

Michigan Tech Publications, Part 1

Most volcanism on Earth is submarine, but volcanic gas emissions by submarine eruptions are rarely observed and hence largely unquantified. On 15 January 2022 a submarine eruption of Hunga Tonga-Hunga Ha’apai (HTHH) volcano (Tonga) generated an explosion of historic magnitude, and was preceded by ∼1 month of Surtseyan eruptive activity and two precursory explosive eruptions. We present an analysis of ultraviolet (UV) satellite measurements of volcanic sulfur dioxide (SO2) between December 2021 and the climactic 15 January 2022 eruption, comprising an unprecedented record of Surtseyan eruptive emissions. UV measurements from the Ozone Monitoring Instrument (OMI) on NASA’s Aura satellite, the …

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Pre-Eruptive Excess Volatiles And Their Relationship To Effusive And Explosive Eruption Styles In Semi-Plugged Volcanoes, Sri Budhi Utami, Juan Andùjar, Fidel Costa, Bruno Scaillet, Hanik Humaida, Simon Carn Sep 2022

Pre-Eruptive Excess Volatiles And Their Relationship To Effusive And Explosive Eruption Styles In Semi-Plugged Volcanoes, Sri Budhi Utami, Juan Andùjar, Fidel Costa, Bruno Scaillet, Hanik Humaida, Simon Carn

Michigan Tech Publications, Part 1

Understanding the role of various factors influencing eruption style is challenging, but it can aid in adapting different hazard mitigations and crisis responses for explosive or effusive events. Here, we focus on the role of magma storage conditions in controlling eruption styles at basaltic andesite volcanoes, and how they can be related to monitoring data. We study the cycle of explosive (1990, sub-Plinian) → effusive (2007, dome) → explosive (2014, sub-Plinian) eruptions from Kelud (Kelut) volcano, Indonesia. We conducted petrological analyses of the eruption products and phase equilibria experiments using pumice and explored a range of temperatures, pressures, oxygen fugacity, …

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Wettability Alteration Process At Pore-Scale During Engineered Waterflooding Using Computational Fluid Dynamics, Yongqiang Chen, Ping Chang, Guang Xu, Quan Xie Sep 2022

Wettability Alteration Process At Pore-Scale During Engineered Waterflooding Using Computational Fluid Dynamics, Yongqiang Chen, Ping Chang, Guang Xu, Quan Xie

Mining Engineering Faculty Research & Creative Works

Engineered waterflooding modifies chemistry of injected brine to efficiently and environmentally friendly enhance oil recovery. The common practice of engineered waterflooding includes low salinity waterflooding (LSW) and carbonated waterflooding. Among these oil recovery methods, wettability alteration has been perceived as a critical physicochemical process for additional oil recovery. While extensive work has been conducted to characterize the wettability alteration, the existing theory cannot explain the conflict oil recovery between secondary mode (injecting engineered water at the very beginning of flooding) and tertiary mode (injecting engineered water after conventional waterflooding), where secondary engineered waterflooding always gives a greater incremental oil recovery …

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A Heuristic Approach To Predict The Tensile Strength Of A Non-Persistent Jointed Brazilian Disc Under Diametral Loading, Mostafa Asadizadeh, Nima Babanouri, Taghi Sherizadeh Sep 2022

A Heuristic Approach To Predict The Tensile Strength Of A Non-Persistent Jointed Brazilian Disc Under Diametral Loading, Mostafa Asadizadeh, Nima Babanouri, Taghi Sherizadeh

Mining Engineering Faculty Research & Creative Works

The mechanical response of rock bridges plays a key role in the stability of concrete and rock structures. In particular, the tensile failure of non-persistent discontinuities can result in their coalescence and the failure of rock or concrete engineering structures. The effect of non-persistent joint parameters on rock structures' failure under tensile mode has not been investigated by many researchers yet. Many non-persistent jointed Brazilian concrete discs are tested under diametral loading in this work, to study the influence of joint spacing, joint continuity factor, loading direction with regard to joint angle, and bridge angle on their tensile behavior. Heuristic …

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Table Of Contents, The Editors Aug 2022

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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Experimental Study On The Mechanical Properties Of Coal-Like Materials For Hydraulic Fracturing Simulation, Zhai Cheng, Zheng Yangfeng, Yu Xu, Xu Jizhao, Sun Yong, Cong Yuzhou, Tang Wei, Li Yujie, Zhu Xinyu, Chen Aikun Aug 2022

Experimental Study On The Mechanical Properties Of Coal-Like Materials For Hydraulic Fracturing Simulation, Zhai Cheng, Zheng Yangfeng, Yu Xu, Xu Jizhao, Sun Yong, Cong Yuzhou, Tang Wei, Li Yujie, Zhu Xinyu, Chen Aikun

Coal Geology & Exploration

Simulation experiments on hydraulic fracturing of the coal seam in the laboratory are an effective method to study the mechanism of fracturing and enhancing permeability of coal-rock mass by hydraulic fracturing in coal mines. However, the technology in-situ sampling for large-size coal mass is immature, and the existing large-size coal samples are mostly taken from the stress-relaxation area, which can be further damaged in the transportation and preparation processes, causing large dispersion in test results. Therefore, The use of coal-like materials is a viable option to replace large-size raw coal for hydraulic fracturing simulation experiments. The mechanical properties of coal-like …

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High-Efficiency Regional Gas Drainage Model After Hydraulic Fracturing Of Comb-Shaped Long Boreholes In The Roof Of Broken Soft And Low Permeability Coal Seam, Chen Dongdong, Wang Jianli, Jia Bingyi, Xi Jie Aug 2022

High-Efficiency Regional Gas Drainage Model After Hydraulic Fracturing Of Comb-Shaped Long Boreholes In The Roof Of Broken Soft And Low Permeability Coal Seam, Chen Dongdong, Wang Jianli, Jia Bingyi, Xi Jie

Coal Geology & Exploration

Advanced management of gas enrichment area is an important guarantee to realize safe, efficient and intelligent mining in coal mine. Aiming at the problem of high-efficiency gas drainage in broken and soft coal seam region, taking No.3 coal seam in Hancheng mining area as the research object, a gas drainage mode of comb-shaped long borehole hydraulic fracturing in the roof of coal seam is proposed. The applicability of the model is verified by means of theoretical analysis, numerical simulation and field test, and the fracture propagation law, gas drainage mechanism, and fracturing curve features of comb-shaped borehole in adjacent roof …

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Experimental Study Of Hydraulic Fracture Evolution With Materials Similar To The Structural Plane, Li Quangui, Wu Xiaobin, Hu Qianting, Liu Le, Shi Jialin, Song Mingyang Aug 2022

Experimental Study Of Hydraulic Fracture Evolution With Materials Similar To The Structural Plane, Li Quangui, Wu Xiaobin, Hu Qianting, Liu Le, Shi Jialin, Song Mingyang

Coal Geology & Exploration

The structural plane extensively occurs in coal measures, and is one of the key factors affecting the hydraulic fracturing effect of coal/rock. The fabrication time and filling material types of the structural plane were adjusted to obtain the coal/rock specimens without the filling structural plane, or the coal/rock specimens with the filling structural plane. The physical experiment for hydraulic fracturing was carried out to find out the effect and action mechanism of the structural plane type and injected flow rate on hydraulic fracture extension. As indicated by the result, in the condition of the injected flow rate of 50 mL/min, …

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Research On Hydraulic Fracturing Technology And Equipment Of Directional Long Drilling With Sand In Coal Seam Roof, Zhang Jian, Liu Le, Zhao Jizhan, Sun Siqing, Wang Chenyang Aug 2022

Research On Hydraulic Fracturing Technology And Equipment Of Directional Long Drilling With Sand In Coal Seam Roof, Zhang Jian, Liu Le, Zhao Jizhan, Sun Siqing, Wang Chenyang

Coal Geology & Exploration

Due to low permeability, fast gas-rate decline, uneven fracturing, easy fracture closure, it is difficult to perform advance gas extraction in broken-soft coal seams. Aimed at these issues, this study has been proposed a new idea to enhance the coalbed permeability and eventually the gas extraction, which is based on roof-supporting, long-reach directional drilling, and hydraulic fracturing. Corresponding equipment including fracturing pump unit, directional sandblasting perforation assembly, sand control packer and tools have been developed. Specifically, the pumping unit is capable of a pumping rate up to 90 m3/h, a pumping pressure up to 70 MPa, and a …

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Optimized Design And Surface Additive Technology Of Pdc Bit For Hard Rock Directional Drilling, Wang Chuanliu, Jin Xin, Gao Xiaoliang, Zhang Peng Aug 2022

Optimized Design And Surface Additive Technology Of Pdc Bit For Hard Rock Directional Drilling, Wang Chuanliu, Jin Xin, Gao Xiaoliang, Zhang Peng

Coal Geology & Exploration

Directional long drilling is the main technical means of gas and water hazard control in coal mines, and the performance of PDC directional bit is an important factor which affects the drilling efficiency in hard rock. In view of frequent tripping and low that caused by the broken PDC bit body and PDC tooth collapse in the construction of directional long drilling in the roof and floor of coal seams, the principle of equal cutting teeth distribution is used to optimize the blade teeth distribution to reduce the impact damage of the cutter. Through the simulated analysis of fluid mechanics, …

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Research Progress And Development Trend Of Staged Hydraulic Fracturing Technology In Long-Borehole Underground Coal Mine, Sun Siqing, Li Wenbo, Zhang Jian, Chen Dongdong, Zhao Jizhan, Zheng Kaige, Long Weicheng, Wang Chenyang, Jia Bingyi, Du Tianlin, Liu Le, Yang Huan, Dai Nan Aug 2022

Research Progress And Development Trend Of Staged Hydraulic Fracturing Technology In Long-Borehole Underground Coal Mine, Sun Siqing, Li Wenbo, Zhang Jian, Chen Dongdong, Zhao Jizhan, Zheng Kaige, Long Weicheng, Wang Chenyang, Jia Bingyi, Du Tianlin, Liu Le, Yang Huan, Dai Nan

Coal Geology & Exploration

Since the “13th Five-Year Plan”, significant progress has been made in the directional long-borehole staged hydraulic fracturing technology, equipment development and engineering demonstration application of underground coal mine through the technical research, equipment development and engineering test with directional long-borehole and staged hydraulic fracturing technology in combination, focusing on the two major issues of regional permeability enhancement, efficient gas drainage and rock weakening treatment of hard roof for coal seams in underground coal mine in China. It is mainly manifested in the following four aspects: (1) Two staged hydraulic fracturing technologies and tools with/without rig movement have been developed. Specifically, …

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Dynamic Disaster Evolution Mechanism Of High Mine Pressure At Hard Roof And Advance Area Prevention And Control Technology, Zheng Kaige, Wang Lintao, Li Bingang, Li Yanjun, Yang Huan, Yang Sen, Dai Nan, Wang Haojie, Wang Zeyang, Xi Jie Aug 2022

Dynamic Disaster Evolution Mechanism Of High Mine Pressure At Hard Roof And Advance Area Prevention And Control Technology, Zheng Kaige, Wang Lintao, Li Bingang, Li Yanjun, Yang Huan, Yang Sen, Dai Nan, Wang Haojie, Wang Zeyang, Xi Jie

Coal Geology & Exploration

The overlying roof on the hard roof working bench is usually not likely to fall off, while tends to form dynamic pressure disaster. The stress evolution characteristics and roof breaking mechanism before and after hard roof weakening were analyzed and revealed using the methods of numerical simulation and theoretical analysis, and the advance area prevention and control technology were proposed and applied in the field practice, for the typical dynamic disaster problem of high mine pressure that was caused by the hard roof against the background of the Buertai Coal Mine in the Shendong Mine Area. As indicated by the …

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Study Of Constitutive Model Of Frozen Sandstone Damage Based On Weibull Distribution, Yi Ming, Zhao Tao, Ma Feifei, Wang Lei, Yuan Chao Aug 2022

Study Of Constitutive Model Of Frozen Sandstone Damage Based On Weibull Distribution, Yi Ming, Zhao Tao, Ma Feifei, Wang Lei, Yuan Chao

Coal Geology & Exploration

Abstract: The deformation and destruction characteristics of frozen rock is a basic mechanical problem encountered during the construction using the freezing method. Under the action of load, the mechanical characteristics and deformation characteristics are greatly different for the rock with different freezing temperatures, which significantly affects the safety and stability of the freezing wall. Therefore, the study of the damage constitutive relation of the frozen rock is significant for instructing the freezing method design and construction. In order to analyze the whole process of the frozen rock deformation and destruction under load action, the Weibull distribution was adopted to describe …

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Experimental Study On Power Matching Of Modular Double Pumping Stations Of Tunnel Drilling Rig, Lu Feifei, Fan Dong, Tian Hongliang Aug 2022

Experimental Study On Power Matching Of Modular Double Pumping Stations Of Tunnel Drilling Rig, Lu Feifei, Fan Dong, Tian Hongliang

Coal Geology & Exploration

In order to solve the problems of heavy weight, relocation and transportation of the power pumping station of tunnel drilling rigs, it is proposed to divide the pumping station through modular design, and adopt the solution of small-displacement, dual-power and dual-pump confluence, effectively reducing the transportation size and weight of a single pump station. A single-pump station or a double-pump confluence is chosen according to the working conditions to improve the flexibility of the drilling rig and reduce energy consumption. The load-sensing system has the advantages of energy saving, good load adaptability, and convenient speed regulation. However, when the dual-load-sensing …

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