Results 121 to 130 of about 240 (159)

A New Multivariate Optical Computing Microelement and Miniature Sensor for Spectroscopic Chemical Sensing in Harsh Environments: Design, Fabrication, and Testing. [PDF]

Sensors (Basel), 2019
Jones CM, Dai B, Price J, Li J, Pearl M, Soltmann B, Myrick ML.   +6 more
europepmc   +1 more source

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Analysis of the Acoustic Wavefields Excited by the Logging-While-Drilling (LWD) Tool

Geosystem Engineering, 2003
ABSTRACTS Synthetic seismograms recorded with a logging-while-drilling (LWD) tool in the presence of slow formation are computed by the discrete wavenumber method. Monopole, dipole, and quadrupole logging tools are simulated with a source center frequency of 4 kHz.
Joongmoo Byun
exaly   +2 more sources

A novel lateral resistivity logging-while-drilling (LWD) method in oil-based drilling fluid

2017 Chinese Automation Congress (CAC), 2017
Well logging technology is of great significance to oil production. A new lateral resistivity logging-while-drilling (LWD) method applied in oil-based drilling fluid condition is proposed in this paper by combining capacitive coupling with inductive coupling principle.
Baoliang Wang, Haifeng Ji, Zhiyao Huang   +2 more
exaly   +2 more sources

Effects on Logging-While-Drilling (LWD) data of mismatch between multipole sources

Exploration Geophysics, 2009
Using a discrete wavenumber method, we examine the effects on Logging-While-Drilling (LWD) logs when a mismatch exists between the amplitudes or generating times of the signals from individual monopoles in a LWD multipole source. An amplitude-mismatched LWD dipole/quadrupole source produces non-dipole/non-quadrupole modes as well as flexural and screw ...
Joongmoo Byun
exaly   +2 more sources

Experimental studies of monopole, dipole, and quadrupole acoustic logging while drilling (LWD) with scaled borehole models

Geophysics, 2008
Abstract We develop a 1:12 scale model logging-while-drilling (LWD) acoustic tool for laboratory measurements in borehole models to investigate the effects of tool wave modes on our ability to determine formation velocities in acoustic LWD.
Zhenya Zhu
exaly   +2 more sources

Using Machine Learning Methods To Identify Coal Pay Zones from Drilling and Logging-While-Drilling (LWD) Data

SPE Journal, 2020
SummaryAccurate coal identification is critical in coal seam gas (CSG) (also known as coalbed methane or CBM) developments because it determines well completion design and directly affects gas production. Density logging using radioactive source tools is the primary tool for coal identification, adding well trips to condition the hole and additional ...
Raymond L Johnson, Johnson Raymond L, Chen Zhongwei   +2 more
exaly   +5 more sources

Logging-While-Drilling (LWD) Results in Indonesia

Offshore Technology Conference, 1992
ABSTRACT The engineering of well log sensors into drill collars enables the recording of Formation Resistivity, Gamma Ray, Neutron Porosity, Bulk Density and Photoelectric Factor (Pe). Data are recorded Downhole and selected data are transmitted to the surface in real time by way of mud pulse telemetry.
Phil Nordy, K. Henry
openaire   +2 more sources

Features of Logging-While-Drilling (LWD) in Horizontal Wells

SPE/IADC Drilling Conference, 1991
ABSTRACT Logging While Drilling (LWD)* tools are formation evaluation sensors engineered into drill collars. Using LWD in horizontal wells offers significant advantages over other logging systems for formation evaluation. When LWD is provided in real-time via mud pulse telemetry the system becomes a geological steering tool which can be ...
R.R. Hansen, J. White
openaire   +1 more source

Effects of tool eccentricity on acoustic logging while drilling (LWD) measurements

SEG Technical Program Expanded Abstracts 2004, 2004
Summary Effects of eccentric tools on acoustic LWD measurements are investigated in both time domain and frequency domain using stretched grid finite difference algorithm and finite element eigenvalue approach, respectively. Monopole, dipole and quadrupole LWD tools are discussed. The study shows that an eccentric LWD tool affects the acoustic field in
Xiaojun Huang, Yibing Zheng, M. Nafi Toksöz   +2 more
openaire   +1 more source