In-situ experimental study on hydro-borehole technology
1 Altmetric Metrics Abstract The hydro-mining technology is considered as a promising method of bituminous coal excavation. The paper presents the results of the in-situ experimental campaign... With extensive application of nearly-horizontal drilling equipment in the coal mining industry, in for example the gas drainage, (PDF) The Underground Directional Drilling
احصل على السعر
Implementation of underground longhole directional
A new method of coal and gas mining by roadway retaining and borehole drilling behind the face has been developed and proved to be successful in the Huainan Intelligent mining equipment and coal mine robots are the core support of intelligent coal mines. At the beginning of 2019, the National Coal Mine Safety Research and practice of intelligent coal mine technology
احصل على السعر
Research and application of high-pressure water jets drilling
Obviously, the underground gas drainage from coal seams is the main method of CBM exploitation in China, accounting for more than 68%. And the current Coal seam gas predrainage technology is considered to be one of the most effective measures to prevent coal mine gas disasters 1,2,3,4,5,6.However, with Study on the technology of enhancing permeability by deep
احصل على السعر
Research on One Borehole Hydraulic Coal Mining System
This paper presents a case study of hydraulic borehole coal mining. The three key techniques of the BHCMS, namely, hydraulic lift of jet pump, air lift, and water , Tao Fan b Add to Mendeley https://doi/10.1016/j.jappgeo.2022.104894 Get rights and content • BHR can be used to detect coal formation interface, combined Using BHR to detect coal seam interface in coal mine
احصل على السعر
Tree-Type Boreholes in Coal Mines for Enhancing
Tree-type borehole drilling (TTBD) is a novel stress relief method for stimulating methane drainage from coal in underground coal mines. This paper is a re Abstract. Water outbursts and rock bursts often occur during the mining of coal seams under water-rich sandstone strata with thicknesses exceeding 50 m, otherwise called ultrathick-and-hard strata Minerals Free Full-Text Borehole-Based
احصل على السعر
(PDF) The Underground Directional Drilling
With extensive application of nearly-horizontal drilling equipment in the coal mining industry, The borehole offset was reduced from 9.9 m to 2.9 m, a decrease of 71%, which improved the gasHere's a general list of mining tools and equipment: Miner tools —tools that miners carry on them, like pickaxe and chisels. Mining PPE —equipment that miners use to stay safe while working. Surface mining Mining Tools in 2022—A Guide to Mining
احصل على السعر
Development of Portable Shallow Hole
Due to the special requirements of borehole measurement work in coal mines, in this paper, a portable shallowhole inclinometer is developed in response to the current situation of shallow boreholeAccording to the development requirements of green mining of coal resources, it is imperative to improve the extraction rate of coal and the application of safe and efficient mining technology. Pre-splitting and roof cutting technology is widely used in reducing residual coal pillars and safe pressure relief mining, which has become the Energies Free Full-Text Application of Pre-Splitting and
احصل على السعر
(PDF) Boreholes: A brief history of an essential mineral
1993 / 94 The last deep borehole for British Coal Engineering noise controls were also evaluated for each piece of highwall mining equipment. The operator and helper working on a modernThe Department of Energy is currently funding a program to develop a borehole mining system that accesses the mineral seam through a small hole drilled through the overburden, remotely crushes the material with a high pressure water jet, and then transports it in a slurry to the surface. The system has been tested in coal seams, uraniumHydraulic borehole mining (Conference) OSTI.GOV
احصل على السعر
Advanced directional drilling technology for gas drainage
Shimada S, Ohga K, Deguchi G. Technologies recovering and utilizing coal seam gas in Japan. Energy Conversion and Management 1996; 37:795-800. [17] Scott T. The Role of Directional Drilling for Safety in Coal Mining. 11 th Turkish Coal Congress, Turkey; 1998, p. 111-115. [18] Thomson S. Directional drilling for safety in coal mining.Based on this, for soft and hard composite coal seams, in order to accurately extract soft layers, a directional hydraulic coal mining equipment has been developed, including a drilling rig pumpIntegrated histogram and mechanical parameters of the experimental coal
احصل على السعر
History and methodology of horizontal drilling ScienceDirect
The history of horizontal drilling can be traced back to 1942 when a 1000-ft.-long borehole was drilled in Pennsylvania, USA. The technology was actually perfected in 1970s by CONOCO when a guided horizontal borehole was drilled in coal to 3000 ft.The equipment consists of a drilling rig, an auxiliary unit for power, a bit guidance device, and Most coal mines in China use model BZW200/31.5 pumps (Liuhe Coal Mining Machinery Co., Ltd., Nanjing, China) with a maximum rated capacity of 200 L/min at their maximum rated pressure of 31.5 MPa(PDF) A Novel Method for Borehole Blockage Removal and
احصل على السعر
Optimization of the Plastic Area of a Borehole
Gas extraction is most commonly used to control gas disasters in coal mines. The distribution of the plastic zone around a borehole and the sealing quality are key factors affecting gas extraction. Overview. 1. Introduction. The origins of the modern-day use of geophysics in coal mining date back to the 1970s and lie mainly in the United Kingdom and West Germany. At that time, the coal mines of these countries were mainly underground. They were getting deeper and the coal was becoming more difficult to win.Overview on the application of geophysics in coal mining
احصل على السعر
Applied Sciences Free Full-Text Numerical Study on the
Large-diameter drilling is an effective method for preventing rock burst disasters in coal mines. In this paper, the roadway stability of the W1123 fully mechanized caving work face of the Kuangou coal mine, located in northwest China, is investigated. A set of numerical modelling techniques were carried out to study the characteristics of The mining coal seam 9# is 12.44–12.94 m below the 10# coal seam and 14–16.55 m above the coal seam 8#. The coal seam spacing is relatively close, so it is easy to cause disturbance to the adjacent coal seam due to the excavation of the working face, making the pressure relief gas flows to the working face through the cracks.The Drainage Horizon Determination of High Directional Long Borehole
احصل على السعر
Mechanism of Coal Permeability Enhancement by a Series of
To solve the difficult problems of gas drainage in coal seams with a high gas content and low permeability, a novel technology based on a series of mechanically over-excavated cavities along drainage boreholes in coal seams to increase permeability was proposed. In this paper, the fluid–solid coupled model of the mechanically over break blockage to dredge borehole. Abstract Draining gas from coal seams in under-ground coal mines is the main method of the coalbed methane exploitation in China. When the gas drain-age boreholes are located at soft, fractured coal rock seams, phenomena such as borehole collapse and blockage occur frequently, resulting in the signi-Research and application of high-pressure water jets
احصل على السعر
DESIGN PROTOCOLS OF CAVITIES CREATED BY
situ applications for the extraction of coal and other economic minerals through boreholes. For example, Dr. George Savanick of the U.S. Bureau of Mines conducted experiments using in-situ borehole mining equipment on several different commodities including coal, gold, and industrial minerals, beginning in the mid-1980s [6].Gas drainage through boreholes can effectively reduce gas disasters and significantly promote the efficient drainage and clean utilization of gas during mining activities. Gas drainage boreholes will deform and fail as the mining proceeds, but there is a lack of effective measures for real-time monitoring of borehole stability currently. Experimental study and field verification of stability monitoring of
احصل على السعر
Ismet CANBULAT Professor (Full) PhD UNSW Sydney
Coal burst occurrences are affected by a range of mining and geological factors. Excessive slipping between the strata layers may release a considerable amount of strain energy, which can beWhen coal bed methane (CBM) drainage boreholes cross fractured, soft, or water-swelling strata, they collapse and block frequently. Borehole blockages result in a rapid decrease in CBM extraction ability, which leads to a reduction in CBM output and threatens coal mine safety production. To solve these problems, a novel method that Energies Free Full-Text A Novel Method for Borehole
احصل على السعر