Determination of Long Horizontal Borehole Height in Roofs and Its Application to Gas Drainage

Gang Wang, Cheng Fan, Hao Xu, Xuelin Liu and Rui Wang
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Gang Wang: Shandong University of Science and Technology, Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base, Qingdao 266590, China
Cheng Fan: Shandong University of Science and Technology, College of Mining and Safety Engineering, Qingdao 266590, China
Hao Xu: Shandong University of Science and Technology, College of Mining and Safety Engineering, Qingdao 266590, China
Xuelin Liu: Shandong University of Science and Technology, College of Mining and Safety Engineering, Qingdao 266590, China
Rui Wang: College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, China

Energies, 2018, vol. 11, issue 10, 1-18

Abstract: Accurately determining the height of the gas-guiding fracture zone in the overlying strata of the goaf is the key to find the height of the long horizontal borehole in the roof. In order to determine the height, in this study we chose the 6306 working face of Tangkou Coal Mine in China as a research example and used both the theoretical model and discrete element method (DEM) numerical simulation to find the height of the gas-guiding fracture zone and applied the height to drill a long horizontal borehole in the roof of the 6303 working face. Furthermore, the borehole was utilized to deep into the roof for coalbed methane drainage and the results were compared with conventional gas drainage measures from other aspects. The height of the gas-guiding fracture zone was found to be 48.57 m in theoretical model based on the bulk coefficient and the void ratio and to be 51.19 m in the DEM numerical simulation according to the temporal and spatial variation characteristics of porosity. Taking both the results of theoretical analysis and numerical simulation into consideration, we determined that gas-guiding fracture zone is 49.88 m high and applied it to drill a long horizontal borehole deep into the roof in the 6303 working face field. Compared with conventional gas drainage measures, we found that the long horizontal borehole has the high stability, high efficiency and strong adaptability for methane drainage.

Keywords: long horizontal borehole; bulk coefficient; DEM; gas-guiding fracture zone; gas drainage (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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