Results 131 to 140 of about 3,047 (185)

Improved Density Processing for LWD Density

Proceedings of SPE Annual Technical Conference and Exhibition, 2006
Abstract Density measurements are intrinsically sensitive to standoff. In wireline logging, it is possible to have the detectors on a pad, reduce the standoff to a minimum, and correct for other effects with a high-level of accuracy. Logging while drilling (LWD) is more challenging because the standoff is much more important than with ...
O. Desport, J. Crowe
openaire   +1 more source

Ballast Requirements for LWD Habitat Structures

Engineering Approaches to Ecosystem Restoration, 1998
A theoretical analysis is presented that forms the basis for determining ballast requirements for LWD habitat structures. Limited field testing of the analysis indicates good agreement with the theory. Tentative design curves have been developed. A monitoring and assessment program is currently underway to test the stability of LWD structures, and to ...
Robert G. Millar, Stéphane G. D'Aoust
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An Efficient FDTD Method for Axially Symmetric LWD Environments

IEEE Transactions on Geoscience and Remote Sensing, 2008
In this paper, an unconditionally stable finite- difference time-domain (FDTD) method in cylindrical coordinates is developed to analyze electromagnetic responses under axially symmetric measure-while-drilling/logging-while-drilling (MWD/LWD) environments.
Dagang Wu, Ji Chen, Ce Richard Liu
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LWD Sonic Data Applications

Proceedings, 2013
LWD sonic data can be used in a broad variety of applications, ranging from classic pore pressure prediction to geosteering in unconventional reservoirs. This paper will review the applications of LWD sonic data and consider the types of tools available in the industry and what sort of data can be transmitted real-time.
openaire   +1 more source

Improving LWD Image and Formation Evaluation by Utilizing Dynamically Corrected Drilling-Derived LWD Depth and Continuous Inclination and Azimuth Measurements

SPE Annual Technical Conference and Exhibition, 2007
Abstract The paper illustrates the improvements in logging while drilling (LWD) images and subsequent formation evaluation by utilizing a new methodology for depth and survey measurements correction. LWD depth measurements are often considered inaccurate and therefore not as reliable for well-to-well correlations ...
G. A. Bordakov, A. V. Kostin, J. Rasmus, D. Heliot, H. Laastad, E. J. Stockhausen   +5 more
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Differences and Similarities: Wireline and LWD Images

Proceedings, 2014
Historically during the development of logging while drilling technologies, LWD, there has been a tendency to compare real time LWD data with wireline data, and expect an overlay. This simplification is in most reservoirs not favorable to any of the data acquired, this due to the differences in the technologies and physical conditions of the wellbore ...
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A New Method for Improving LWD Logging Depth

SPE Annual Technical Conference and Exhibition, 2006
Abstract This paper will describe a new method for improving Logging While Drilling (LWD) depth accuracy. Case studies that describe this technique will also be presented. It is generally accepted that using the Drillers depth measurement for LWD applications has been the most practical solution to a complex depth problem.
Christopher Chia, Harald Laastad, Alexander Kostin, Frode Hjortland, Georgiy Bordakov   +4 more
openaire   +1 more source

Forward modeling and inversion of LWD induction data

Russian Geology and Geophysics, 2015
Abstract The processing algorithms for high-frequency induction resistivity data are applied to logs acquired at different stages of well construction. Open-hole induction logging while reaming of vertical wells provides a priori information on geology and resistivity distribution.
M.I. Epov, V.N. Glinskikh, K.V. Sukhorukova, M.N. Nikitenko, V.N. Eremin   +4 more
openaire   +1 more source

LWD For Imaging, Wellbore Placement, And Formation Evaluation

Offshore Technology Conference, 2005
Abstract Logging while drilling measurements are now widely available throughout the world for a variety of applications. Many of the first generation LWD measurements are similar to what was traditionally obtained using wireline methods. However, there are now measurements available that are either complementary or
J.C. Rasmus, C. Esmersoy, J. Seydoux, A. Hawthorn   +3 more
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Models In LWD Applications

1999
A model for a fluid-filled borehole with an LWD tool is used to identify and analyze the monopole, dipole, and quadrupole modes that are present. The modes can be classified into three groups and have dispersion behavior that is influenced predominantly by the geometry and material properties of the three borehole layers (inner fluid column, tool, and ...
Rao, V. N. Rama, Burns, Daniel R., Toksoz, M. Nafi   +2 more
openaire   +1 more source