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Research on One Borehole Hydraulic Coal Mining System
2008-7-1 The Borehole Hydraulic Coal Mining System (BHCMS) causes fragmentation of coal seams and removes coal slump through a drilled hole using high-pressure water jet. Then the mixture of coal and water as slurry are driven out of the borehole by hydraulic or air-lifting method, and are separated at the surface. This stone presents a case study of
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Research on One Borehole Hydraulic Coal Mining System
The Borehole Hydraulic Coal Mining System (BHCMS) causes fragmentation of coal seams and removes coal slump through a drilled hole using high-pressure water jet. Then the mixture of coal and water as slurry are driven out of the borehole by hydraulic or air-lifting method, and are separated at the surface. This stone presents a case study of
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Research on One Borehole Hydraulic Coal Mining System
The Borehole Hydraulic Coal Mining System (BHCMS) causes fragmentation of coal seams and removes coal slump through a drilled hole using high-pressure water jet. Then the mixture of
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Research on One Borehole Hydraulic Coal Mining System
The Borehole Hydraulic Coal Mining System (BHCMS) causes fragmentation of coal seams and removes coal slump through a drilled hole using high-pressure water jet. Then the mixture of coal and water as slurry are driven out of the borehole by hydraulic or air-lifting method, and are separated at the surface. This stone presents a case study of hydraulic borehole coal mining.
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Evaluation of Borehole Hydraulic Fracturing in Coal Seam
2020-11-17 Accurate evaluation of the influence range of borehole hydraulic fracturing (HF) in coal seam is crucial for optimizing the design scheme of HF. In this study, we adopted the microseismic (MS) monitoring technology to monitor and characterize the spatial shape of cracks caused by borehole HF in coal seam in an underground coal mine. And we also tested and
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Underground hydraulic mining of thin sub-layer as
[14][15][16][17] In regards to the hydraulic mining, a feasible method named borehole hydraulic coal mining system was developed, which involves
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Cross-borehole hydraulic slotting technique for preventing
2015-9-1 Research on one borehole hydraulic coal mining system Earth Sci. Front.,15 ( 2008 ),pp. 222 226 Article Download PDF View Record in Scopus Google Scholar
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The novel technology of drilling arrangement of rock cross
The ideal jet of the monitor in the borehole hydraulic coal-mining system is a nonsubmergible free jet. Through air lift, the nonsubmergible free jet can be set up in the mining hole. Read more
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In-Situ LeachingBorehole Mining
2019-1-14 Borehole Mining. Although the Bureau had not been engaged in hydraulic borehole mining research prior to FY 1974, it had been actively
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Experimental research on the performances of water jet
2018-6-20 It follows the same basic principles as the high-pressure jet grouting and hydraulic coal mining, they all use high-pressure jet to break the ore bed or the rock and soil mass [14–17]. Moreover, borehole hydraulic mining technology has many advantages. The most significant advantage is that the method does not need to remove the overlying strata.
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Evaluation of Borehole Hydraulic Fracturing in Coal Seam
2020-11-17 Accurate evaluation of the influence range of borehole hydraulic fracturing (HF) in coal seam is crucial for optimizing the design scheme of HF. In this study, we adopted the microseismic (MS) monitoring technology to monitor and characterize the spatial shape of cracks caused by borehole HF in coal seam in an underground coal mine. And we also tested and
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Underground hydraulic mining of thin sub-layer as
[14][15][16][17] In regards to the hydraulic mining, a feasible method named borehole hydraulic coal mining system was developed, which involves
Contact
A new cross‐borehole hydraulic caving technique in the
2020-1-16 1 INTRODUCTION. Coal mine methane (CMM) is a kind of coal‐associated energy that can be used directly. 1 The gas storage has reached 36.81 trillion cubic meters with the depth of <2000 m in China. 2 In normal conditions, gas extraction is required before mining methane‐bearing coal seams to eliminate coal and gas outburst and use methane reasonably.
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A new cross‐borehole hydraulic caving technique in the
borehole and the permeability of the coal around the borehole are. Hydraulic slotting can enhance permeability by cutting coal seam fractures with high-pressure water jet. Therefore, hydraulic flushing and hydraulic slotting are often used to enhance permeability in coal mines. A lot of research on hydraulic slotting have been done in
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In-Situ LeachingBorehole Mining
2019-1-14 Borehole Mining. Although the Bureau had not been engaged in hydraulic borehole mining research prior to FY 1974, it had been actively engaged in research to utilize hydraulic jet cutting technology for safer, more efficient
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Research and application of hydraulic fracturing borehole
Aiming at the problems existing in the sealing of fracturing boreholes using the regular bag sealing device in the conventional ‘two sealing and one injection’ process, this stone investigated a practical and reliable ZBQ-30/1.0 modified pneumatic grouting pump for coal mines, optimized the ‘B’ sealing material which was applied for the sealing of fracturing boreholes designed the
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Research on Application of Hydraulic Fracturing Enhanced
2019-10-25 Coal and gas outburst accident is one of the critical disasters restricting the safety production of coal enterprises in China. To solve the problems of low permeability and difficulty in gas extraction, a hydraulic fracturing test was carried out according to the occurrence characteristics of coal and rock gas in Pingdingshan Coal Mine No. 12; and the change law of
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Experimental research on the performances of water jet
2018-6-20 It follows the same basic principles as the high-pressure jet grouting and hydraulic coal mining, they all use high-pressure jet to break the ore bed or the rock and soil mass [14–17]. Moreover, borehole hydraulic mining technology has many advantages. The most significant advantage is that the method does not need to remove the overlying strata.
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Study on Borehole Arrangement Methods for Gas
2020-10-28 Research Article Study on Borehole Arrangement Methods for Gas Extraction by Hydraulic Slotting in Long-Distance Through-Coal Seam Tunnel Cunfang Zhu1 and Shuang Cai 2 1Qinghai Local Railway Construction Investment Co. Ltd., Xining 810001, China 2China Merchants Chongqing Communication ResearchDesign Institute Co., Ltd., Chongqing
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An experimental investigation into the borehole drilling
2021-7-20 Nevertheless, borehole drilling is an adaptive system in coal mines. The drilling parameters all change accordingly when the drill bit encounters different rock formations [ 18 ]. At present, many scholars have studied the relationship between drilling parameters and rock mechanical properties in the laboratory [ 19,20 ].
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A new cross‐borehole hydraulic caving technique in the
borehole and the permeability of the coal around the borehole are. Hydraulic slotting can enhance permeability by cutting coal seam fractures with high-pressure water jet. Therefore, hydraulic flushing and hydraulic slotting are often used to enhance permeability in coal mines. A lot of research on hydraulic slotting have been done in
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A new cross‐borehole hydraulic caving technique in the
2020-1-16 1 INTRODUCTION. Coal mine methane (CMM) is a kind of coal‐associated energy that can be used directly. 1 The gas storage has reached 36.81 trillion cubic meters with the depth of <2000 m in China. 2 In normal conditions, gas extraction is required before mining methane‐bearing coal seams to eliminate coal and gas outburst and use methane reasonably.
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Hydraulic Mining Methods 911 Metallurgist
2018-10-3 Hydraulic Borehole Mining. From 1975 to 1982 the U.S. Bureau of Mines and the Department of Energy funded a program to develop a manless mining technique that accessed the coal seam through a 400 mm borehole
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An experimental investigation into the borehole drilling
2021-7-20 Nevertheless, borehole drilling is an adaptive system in coal mines. The drilling parameters all change accordingly when the drill bit encounters different rock formations [ 18 ]. At present, many scholars have studied the relationship between drilling parameters and rock mechanical properties in the laboratory [ 19,20 ].
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Energies Free Full-Text Research on Hydraulic
Coalbed methane (gas) is a high quality and clean resource, but it also causes disasters in coal mines in China. The low permeability of coal seams is the main reason that developing coalbed methane (CBM) as an energy resource is difficult, so increasing coal seam permeability is the key to CBM development in China. In this , the principal techniques for seam permeability
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Research and application of hydraulic fracturing borehole
Aiming at the problems existing in the sealing of fracturing boreholes using the regular bag sealing device in the conventional ‘two sealing and one injection’ process, this stone investigated a practical and reliable ZBQ-30/1.0 modified pneumatic grouting pump for coal mines, optimized the ‘B’ sealing material which was applied for the sealing of fracturing boreholes designed the
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Study on Borehole Arrangement Methods for Gas
2020-10-28 Research Article Study on Borehole Arrangement Methods for Gas Extraction by Hydraulic Slotting in Long-Distance Through-Coal Seam Tunnel Cunfang Zhu1 and Shuang Cai 2 1Qinghai Local Railway Construction Investment Co. Ltd., Xining 810001, China 2China Merchants Chongqing Communication ResearchDesign Institute Co., Ltd., Chongqing
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How to Seal Hydraulic Fracturing Boreholes in the Large
2021-9-22 This research was funded by the Open Research Fund Program of the State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines (SKLMRDPC20KF04); the Open Research Fund Program of the Key Laboratory of Safety and High-efficiency Coal Mining, Ministry of Education (Anhui University of Science and
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Research on Monitoring Technology of Influence Range
2018-12-17 Research on Monitoring Technology of Influence Range of Coal Mine Hydraulic Fracturing . Wang Kai . 1, a *, Dai Linchao. 2, Zhou Dongping. 1. 1. Gas Research Branch, Chongqing Energy Investment Group ScienceTechnology Co., Ltd, Chongqing
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hydraulic mining addition fotowalkiewicz.pl
Research on One Borehole Hydraulic Coal Mining System. Jul 01, 2008 The ideal jet of the monitor in the borehole hydraulic coal-mining system is a nonsubmergible free jet. Through air lift, the nonsubmergible free jet can be set up in the mining hole. References 1 Dibble M F. Borehole mining improved technology expands horizon.
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