research on one borehole hydraulic coal mining system

hydraulic system of coal mining machinery

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 paper presents a case study of ...

Application of Hydraulic Flushing in Coal Seams To Reduce ...

Application of Hydraulic Flushing in Coal Seams To Reduce Hazardous Outbursts in the Mengjin Mine, China ... Xuzhou 221116, China, and National Engineering Research Center for Coal and Gas Control, Faculty of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China ... between three monitoring boreholes at different ...

University of Wollongong Research Online

2020-10-13 · Research Online Coal Operators'' Conference Faculty of Engineering and Information ... Resin anchored roof bolts are the basis for the primary roof support system of every underground coal mine in Australia. ... Bolts were installed according to manufacturer''s recommendations on a specially devised hydraulic bolting rig, albeit one that may ...

US Patent Application for HYDRAULIC BOREHOLE MINING …

2014-10-13 · A hydraulic borehole mining system controlled and operated above-ground includes a high-pressure cutting nozzle that is delivered to an underground resource body through a relatively small diameter borehole. A series of water and air fluid streams at various pressures are delivered to the resource body, and the target resource is disaggregated and/or fluidized and …

Research and Application of Hydraulic Measures …

2020-12-21 · hydraulic fracturing on low permeability coal seam, the author selected a floor roadway of No.2 level and mining area in Huainan mine. the occurrence structure of one group of coal in the mining area is stable, with an average coal thickness of 70 m., and there is 0.9 m thick gangue in the middle. The gas content is 9.1 ~ 11.7 m

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

The Application of Water Jets in Coal Mining

2020-11-4 · the coal market. In more than one mine where hydraulic mining sections were es­ tablished, although the hydraulic section remained profitable, the mine as a whole did not (15). The volume of coal mining research fell away, and hydraulic mining practice passed from the American scene. In Russia, however, the methods were be­ ing refined and ...

Hydraulic Stimulation of a Surface Borehole for Gob ...

2012-8-30 · Hydraulic Stimulation of a Surface Borehole for Gob Degasif ication ... during coal mining may vary substantially from one mine to another. In some very gassy mines, a single section may produce several million cubic feet per ... All authors are with the Pittsburgh Mining and Safety Research Center, Pitts- burgh, Pa.

Borehole Microseismic Imaging of Hydraulic Fracturing: …

2020-4-26 · Borehole Microseismic Imaging of Hydraulic Fracturing: A Pilot Study on a Coal Bed Methane Reservoir in Indonesia . Rexha Verdhora Ry. 1,*, Tepy Septyana. 2, Sri Widiyantoro. 1, Andri Dian Nugraha. 1 & Arii Ardjuna. 3. 1. Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering,

The Effect of Natural Fracture Heterogeneity on …

2019-11-21 · hydraulic fracture propagation and associated seismic response. This research aimed at conducting hydraulic fracturing experiments on two 0.3 × 0.3 m × 0.3 m cubic blocks, one shale and one coal, under true tri-axial stress conditions. The shale block used was highly homogeneous and without visible fractures, while the coal block contained a

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 Research & Design Institute Co., Ltd., Chongqing …

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 Science & Technology Co., Ltd, Chongqing

Hydraulic fracturing of hard top coal and roof for ...

2018-8-20 · Abstract. Due to the poor cavability of top coal, the connection between the high-level gas drainage lane and the gob is not sufficient during the initial minin

Evaluation of In-Seam Borehole Stability in Coal Mines

The cost of the system is extremely high and it remains to be seen if it will be a viable system for underground coal mines. The mechanism that seems to control borehole failure is the tensile stress developed at the skin in the crown of the borehole, or high shear stress developed slightly behind the borehole wall.

EVALUATION OF BOREHOLE MINING AT THE HANSEN …

2012-2-12 · Hydraulic Borehole Mining (HBHM) has been utilized in several applications in varying geological conditions since the 1970''s when the United States Bureau of Mines (USBM) developed an experimental mining system to research this mining technology. Remote mining from a borehole by cutting the target ore with

mining borehole supply mine

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 ...

Research on Hydraulic Technology for Seam Permeability ...

Downloadable! 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 paper, the principal techniques …

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 …

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 paper presents a case study of hydraulic borehole coal mining.

University of Wollongong Research Online

2020-10-13 · Croft, G.A. (1980) Summary of Research into Incremental Hydraulic Fracturing of Coal Seams at the M.W. Haenke Colliery, Ipswitch, The Research Section of the Queensland Dept of Mines, Report, Feb. 21, 1980. Diamond, W.P., and Oyler, D.C. 1987 Effects of Stimulation Treatments on Coalbeds and Surrounding Strata, RI

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

Variation in the Pore Structure of Coal after Hydraulic ...

2018-3-1 · The borehole hydraulic coal mining system was demonstrated to be a feasible method for hydraulic mining (Xia et al. 2008). The method involves fragmenting coal seams by high-pressure water jet and removing coal slump through a drilled hole by hydraulic or airlifting methods. More recently, a novel hydraulic method for underground mining of a ...

Hydraulic fracturing technology for

2012-9-17 · In hydraulic fracturing of coal seams, the borehole water pressure is used to change the stress state in the coal mass adjacent to the borehole, leading to crack initiation and propagation (Figure 1). Fissure water pressure is used to control the extension of the main hydraulic crack. Meanwhile, with the expansion of the main hydraulic crack ...

US4536035A

A method of hydraulically mining an underground pitched mineral vein comprising drilling a vertical borehole through the earth''s lithosphere into the vein and drilling a slant borehole along the footwall of the vein to intersect the vertical borehole. Material is removed from the mineral vein by directing a high pressure water jet thereagainst.

A Review of In Situ Stress Measurement ...

2020-10-13 · the 2018 Coal Operators'' Conference, Mining Engineering, University of Wollongong, 18-20 February 2019 https://ro.uow /coal/690 Research Online is the open access institutional repository for the University of Wollongong. For further information contact the UOW Library: [email protected] . Research Online

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 paper presents a case study of ...

A new cross‐borehole hydraulic caving technique in the ...

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. 3-6 As shown in …