Construction Technology of Directional Long Drilling in Roof Fracture Zone of Coal Seam Mining Pressure Relief Gas Drainage#br#

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Modern Mining ›› 2020, Vol. 36 ›› Issue (12): 225-.

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Construction Technology of Directional Long Drilling in Roof Fracture Zone of Coal Seam Mining Pressure Relief Gas Drainage#br#

CAO Jianming

Online:2020-12-25 Published:2021-10-06

Abstract

CAO Jianming. Construction Technology of Directional Long Drilling in Roof Fracture Zone of Coal Seam Mining Pressure Relief Gas Drainage#br#[J]. Modern Mining, 2020, 36(12): 225-.

Construction Technology of Directional Long Drilling in Roof Fracture Zone of Coal Seam Mining Pressure Relief Gas Drainage#br#

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