Trajectory design of oblique section in nearly horizontal directional hole in inclined formation in underground coal mine

Authors

ZHANG Yingjie, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
ZHAO Yongzhe, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
YANG Zhong, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
MO Haitao, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China

Abstract

Trajectory design of the near-horizontal directional drilling technology in underground coal mine is one of key aspects to successfully implement the technology. The trajectory of hole in a nearly horizontal formation is designed generally by two-dimensional method, and this method usually leads to the problem that the deflecting section of the hole travels out of the inclined target formation.Therefor, the calculation methods of the drilled formation true thickness were studied in the paper, the method using the unit normal vector of formation was proposed, and computation table in Excel was developed to guide trajectory design of near-horizontal directional drilling. The reliability of the method is verified in oblique section construction of a nearly horizontal directional hole in the limestone of Taiyuan Formation in Pansidong Mine, which has certain guiding significance for similar engineering problems.

Keywords

directional drill, inclined formation, oblique section, trajectory design

DOI

10.3969/j.issn.1001-1986.2019.02.005

Recommended Citation

ZHANG Yingjie, ZHAO Yongzhe, YANG Zhong, et al. (2019) "Trajectory design of oblique section in nearly horizontal directional hole in inclined formation in underground coal mine," Coal Geology & Exploration: Vol. 47: Iss. 2, Article 6.
DOI: 10.3969/j.issn.1001-1986.2019.02.005
Available at: https://cge.researchcommons.org/journal/vol47/iss2/6

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