TECHNIQUE OF EXPERIMENTAL TESTING OF THE TECHNOLOGY OF CYCLIC HYDRO IMPACT ON COAL SEAM THROUGH WELLS FROM THE SURFACE

2018 ◽  
Vol 6 (32) ◽  
pp. 17-25
Author(s):  
S.V. Slastunov ◽  
◽  
A.A. Meshkov ◽  
E.V. Mazanik ◽  
I.A. Komissarov ◽  
...  
Keyword(s):  
Coal Seam ◽  
Experimental Testing

scholarly journals Analysis of Application Parameters of Hydraulic Slotting Technology in Jointed Coal Reservoirs

2019 ◽  
Vol 9 (24) ◽  
pp. 5536
Author(s):  
Zhaolong Ge ◽  
Shaojie Zuo ◽  
Yingwei Wang ◽  
Youchang Lyu ◽  
Xinyan Feng
Keyword(s):  
Coal Seam ◽  
Rotation Speed ◽  
Experimental Testing ◽  
Water Pressure ◽  
High Water ◽  
Fracture Network ◽  
Field Application ◽  
Water Jet ◽  
Jet Impact ◽  
Complex Fracture Network

Hydraulic slotting technology is typically used in coal mines to enhance permeability and prevent gas outbursts. Because a coal seam contains many cleats and joints, this study investigated the influence of conventional application parameters on the hydraulic slotting effect by numerical simulation and experimental testing. The cleats in the coal generated stress concentration and initiated with the water jet impact, which promoted the formation of a complex fracture network. The optimized arrangement included angles with an inclination of 20–45° between the borehole and the coal seam strike. The water jet pressure and rotation speed determined the shape of the slot. A high water jet pressure and low rotation speed promoted the formation of cracks at the end of the slot and strengthened the permeability-enhancing effect. Coal fragments could more easily peel off from the sides of the seam and block the borehole. The high water pressure and low rotation speed application parameters were optimized without blocking the borehole. Results obtained by field application revealed that the gas extraction flow after optimization was 1.3 times that of conventional hydraulic slotting. An appropriate angle between the cleats and borehole can more effectively increase the permeability of the coal seam and results in higher gas drainage flow. The results of this study can be useful as guidelines for field applications of hydraulic slotting technology.

Experimental Testing of Older AASHTO Type II Bridge Girders with Corrosion Damage at the Ends

PCI Journal ◽  
2019 ◽  
Vol 64 (1) ◽  
Author(s):  
Cameron D. Murray ◽  
Brittany N. Cranor ◽  
Royce W. Floyd ◽  
Jin-Song Pei
Keyword(s):  
Experimental Testing ◽  
Corrosion Damage ◽  
Bridge Girders ◽  
Type Ii

DESIGN, MANUFACTURING AND EXPERIMENTAL TESTING OF A SELF-CLEANING EXIT PORT MECHANISM FOR A SOLAR REACTOR

2019 ◽  
Author(s):  
Joppe Rutten ◽  
Jens Verschoren ◽  
Nesrin Ozalp ◽  
Cédric Ophoff ◽  
David Moens
Keyword(s):  
Experimental Testing ◽  
Solar Reactor ◽  
Exit Port ◽  
Self Cleaning

Phosphorus minerals in tonstein; coal seam 405 at Sośnica-Makoszowy coal mine, Upper Silesia, southern Poland

2013 ◽  
Vol 63 (2) ◽  
pp. 271-281 ◽  
Author(s):  
Magdalena Kokowska-Pawłowska ◽  
Jacek Nowak
Keyword(s):  
Trace Elements ◽  
Coal Seam ◽  
Mineral Composition ◽  
Coal Mine ◽  
Chemical Compositions ◽  
Coal Basin ◽  
Upper Silesia ◽  
Southern Poland ◽  
Basin Area

Abstract Kokowska-Pawłowska, M. and Nowak, J. 2013. Phosphorus minerals in tonstein; coal seam 405 at Sośnica- Makoszowy coal mine, Upper Silesia, southern Poland. Acta Geologica Polonica, 63 (2), 271-281. Warszawa. The paper presents results of research on tonstein, which constitutes an interburden in coal seam 405 at the Sośnica- Makoszowy coal mine, Makoszowy field (mining level 600 m), Upper Silesia, southern Poland. The mineral and chemical compositions of the tonstein differ from the typical compositions described earlier for tonsteins from Upper Silesia Coal Basin area. Additionally, minerals present in the tonsteins include kaolinite, quartz, kaolinitised biotite and feldspars. The presence of the phosphatic minerals apatite and goyazite has been recognized. The presence of gorceixite and crandallite is also possible. The contents of CaO (5.66 wt%) and P2O5 (6.2 wt%) are remarkably high. Analysis of selected trace elements demonstrated high contents of Sr (4937 ppm) and Ba (4300 ppm), related to the phosphatic minerals. On the basis of mineral composition the tonstein has been identified as a crystalline tonstein, transitional to a multiplied one.

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