Results 201 to 210 of about 5,423 (259)

Deep microbial colonization during impact-generated hydrothermal circulation at the Lappajärvi impact structure, Finland. [PDF]

Nat Commun
Gustafsson J, Osinski GR, Roberts NMW, Quade J, Wang Z, Whitehouse MJ, Jeon H, Karlsson A, Hietala S, Drake H.   +9 more
europepmc   +1 more source

An equivalent circulating density prediction model for extended-reach horizontal wells considering drill strings sinusoidal buckling. [PDF]

Sci Rep
Huang Z, Li Y, Jiang K, Ge J, Gu Y, Hu Z.   +5 more
europepmc   +1 more source

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Rock penetration into cemented carbide drill buttons during rock drilling

Wear, 2008
In percussive and rotary percussive rock drilling, the rock is crushed into small fragments by the repeated hard impact of the drill bit, and subsequently removed by flushing water or air. To avoid excessive wear, the steel drill bit is equipped with a set of cemented carbide buttons that protrude from the bit to take the actual impact.
Sture Hogmark, Staffan Jacobson
exaly   +2 more sources

An investigation into rock drilling

International Journal of Surface Mining, Reclamation and Environment, 1991
ABSTRACT Drilling is a pre-requisite operation in mining, oil and constructional industry. The choice of drilling method depends on rock properties, specific production requirement, equipment availability, size and shape of tools, nature of forces, etc. For economical drilling, higher drilling rate with minimum bit wear is required.
A. K. Pandey, A. K. Jain, D. E Singh
openaire   +1 more source

Rock fracture by diamond drilling. [PDF]

The mode of fracture in rocks that necessitate the use of diamond drilling techniques is normally brittle. Such rocks, which may be regarded as polycrystalline materials, maintain their uniaxial mode of brittle fracture up to relatively high constraining pressures, that is pressures higher than those normally associated with diamond drilling.
openaire   +1 more source

Rock Drill

2023
Ma Fei, Xu Kuangdi
openaire   +1 more source

Rock Drill

Scientific American
  +5 more sources

Rock Drilling—The Burleigh Drill

Scientific American, 1878
openaire   +1 more source

Study of the effect of drill bits hardness, drilling machine operating parameters and rock mechanical parameters on noise level in hard rock drilling process

Measurement: Journal of the International Measurement Confederation, 2021
Reza Mikaeil, Alireza Baghbanan
exaly  

A new view of the deterioration and wear of WC/Co cemented carbide rock drill buttons

Wear, 2008
Staffan Jacobson
exaly