Results 231 to 240 of about 19,345 (302)

Reasonable drilling angle and technology application for pre-cracking thick-hard roofs before driving gob-side roadways in ultra-thick seams. [PDF]

Sci Rep
He F, Wu Y, Wang D, Zhang J, Tao K.
europepmc   +1 more source

Weighting Material in Drilling Fluids: Sagging Mechanisms, Influencing Factors, and Prevention Strategies. [PDF]

ACS Omega
Li MC, Yang D, Sun J, Lv K, Zhang Y, Shen H, Wang Q, Liu C.   +7 more
europepmc   +1 more source

Utility and outcome of piezoelectric bone conduction implant in managing mixed hearing loss with incomplete partition type 2 and enlarged vestibular aqueduct. [PDF]

SAGE Open Med Case Rep
Bukhari AF, Kullab AA, Garrada M, Zawawi F.   +3 more
europepmc   +1 more source

Study on crack propagation law of overlying strata in the process of small coal pillar mining in inclined extra-thick coal seam. [PDF]

Sci Rep
Lu W, Zhao P, Jin Q, Jin H, Li S, Bai J.
europepmc   +1 more source

Deviation of exhaust air and hammer drills.

La Medicina del lavoro, 1968
E, Bartalini, N, Lo Martire, L, Metrico
openaire   +1 more source

Air leakage characteristics and comprehensive prevention of goaf side retained roadway of fully mechanized mining faces in Qincheng coal mine. [PDF]

Sci Rep
Luo X, Chen L, Wu B, Sun M, Yang T, Yu H.   +5 more
europepmc   +1 more source

Numerical analysis on the drilling force of pneumatic impactors under different working conditions and structural parameters. [PDF]

Sci Rep
Li D, Tong L, Huang Z, Xu X, Wang S, Mao J, Zhu H, Deng Y, Chen X.   +8 more
europepmc   +1 more source

Theory calculation and testing of air injection parameters in ice core drilling with air reverse circulation

Polar Science, 2018
Drilling with air reverse circulation is considered one of the most promising technologies in ice core drilling, especially in firn-ice drilling, as it has many advantages in preventing air circulation loss, improving stability of the borehole, and ...
Pinlu Cao, Baoyi Chen
exaly   +2 more sources

Air and Gas Drilling Manual

, 2009
The third edition of Air and Gas Drilling describes the basic simulation models for drilling deep wells with air or gas drilling fluids, gasified two-phase drilling fluids, and stable foam drilling fluids.
Lyons, William C.
openaire   +2 more sources

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Mechanism of Drilling Wells with Air as the Drilling Fluid

Proceedings of Conference on Drilling and Rock Mechanics, 1965
Abstract A microbit apparatus has been used to study how and why field drilling rates are usually higher when air is circulated rather than liquids. Our laboratory results with air are compared with the work of others who have circulated liquids to remove cuttings, and a theory for air drilling has been developed ...
Madan Singh Jr., Robert Goodwin
openaire   +2 more sources