Results 161 to 170 of about 9,817 (229)

Global change factors differ in effect when acting alone and in a multi-factor background. [PDF]

Nat Commun
Rongstock R, Li H, Lehmann A, Wulf A, Rillig MC.   +4 more
europepmc   +1 more source

Downhole Recording System for MWD [PDF]

Proceedings of SPE Annual Technical Conference and Exhibition, 1981
ABSTRACT Downhole recording systems are an important category of measurement-while-drilling (MWD) systems that has been obscured by the recent concentration of development work on mud-pulse communications systems. The recording system can serve a segment of the MWD market that cannot be economically served, at present, by systems having ...
Donald S. Grosso, Jean C. Raynal, Dennis Rader   +2 more
core   +3 more sources

Prospects of Applying MWD Technology for Quality Management of Drilling and Blasting Operations at Mining Enterprises

Minerals (Basel, Switzerland), 2020
This paper presents a review of measurement while drilling (MWD) technology as applied to the mining industry, describes its development path, provides a global review of literature on this topic, and outlines further trends of development for research ...
V A Isheyskiy, JOSÉ A Sanchidrían, Sanchidrían JOSÉ A   +2 more
exaly   +2 more sources

Improved filtering and normalizing of Measurement-While-Drilling (MWD) data in tunnel excavation

Tunnelling and Underground Space Technology, 2020
Measurement-While-Drilling (MWD) data are complex because of the drilling process and drilling system. Swift and accurate normalization and filtration processes are required if MWD data are to be used for rock mass characterization.
Jeroen Van Eldert, Håkan Schunnesson, David Saiang   +2 more
exaly   +2 more sources

CONTROL ORIENTATED B-SPLINE MODELLING OF A DYNAMIC MWD SYSTEM

IFAC Postprint Volumes IPPV / International Federation of Automatic Control, 2006
A detailed dynamic model has been developed for the molecular weight distribution (MWD) of styrene bulk polymerization in a continuous stirred tank reactor (CSTR).
Hong Yue, Liulin Cao
exaly   +1 more source

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AN MWD DOWNHOLE ASSISTANT DRILLER

Proceedings of SPE Annual Technical Conference and Exhibition, 1995
Abstract Identification of drilling problems is most commonly achieved by simple comparisons of surface and downhole time-averaged measurements of weight and torque, or by shock and vibration sensors located either downhole or at the surface.
Mark Hutchinson, Vladimir Dubinsky, Henry Henneuse   +2 more
openaire   +1 more source