R
Richard A. Rosthal
Researcher at Schlumberger
Publications - 59
Citations - 1787
Richard A. Rosthal is an academic researcher from Schlumberger. The author has contributed to research in topics: Electromagnetic coil & Antenna (radio). The author has an hindex of 26, co-authored 59 publications receiving 1776 citations. Previous affiliations of Richard A. Rosthal include Schlumberger Oilfield Services.
Papers
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Patent
Induction logging method and apparatus including means for combining on-phase and quadrature components of signals received at varying frequencies and including use of multiple receiver means associated with a single transmitter
TL;DR: The skin effect of the formation is used advantageously by operating a simple induction sonde at a plurality of frequencies simultaneously as mentioned in this paper, which depends for its operation not only upon its arrangement of coils, but also upon the skin depth.
Patent
Method and apparatus for directional well logging with a shield having sloped slots
Brian Clark,Richard A. Rosthal,Dean M. Homan,Dzevat Omeragic,Bonner Stephen D,Scott S. Chesser,Thomas D. Barber +6 more
TL;DR: In this paper, a new antenna coil shield is proposed to filter interacting electromagnetic energy field components to pass those components corresponding to a magnetic dipole oriented at an angle from the tool axis.
Patent
Apparatus and method for determining the resistivity of earth formations
TL;DR: In this article, an apparatus for determining the resistivity of formations surrounding an earth borehole is presented, where an electrode is mounted on the body and has a surface that is electrically isolated from the surface of the body.
Patent
Directional electromagnetic measurements insensitive to dip and anisotropy
TL;DR: In this article, the distance of the logging tool to a bed boundary is obtained using "up-down" measurements with antenna configurations having tilted magnetic dipoles, which are insensitive to anistropy and dip, undesirable complications of directional measurements.
Patent
Dipmeter apparatus and method using transducer array having longitudinally spaced transducers
TL;DR: In this paper, a disclosed embodiment utilizes one or more toroidal coil antennas mounted, in an insulating medium, on a drill collar to induce currents which travel in a path that includes the drill and earth formations around the drill collar.