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The Pulsed Neutron Capture Gamma Borehole Logging Tool
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Book Synopsis The Pulsed-neutron, Capture Gamma Borehole Logging Tool by : P. L. Ølgaard
Download or read book The Pulsed-neutron, Capture Gamma Borehole Logging Tool written by P. L. Ølgaard and published by . This book was released on 1987 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Reactor Physics Model for a Pulsed-neutron Capture-gamma Borehole Logging Tool by : P. L. Ølgaard
Download or read book A Reactor Physics Model for a Pulsed-neutron Capture-gamma Borehole Logging Tool written by P. L. Ølgaard and published by . This book was released on 1987 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pulsed Neutron Logging written by and published by . This book was released on 1979 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Principles and Applications of Well Logging by : Hongqi Liu
Download or read book Principles and Applications of Well Logging written by Hongqi Liu and published by Springer. This book was released on 2017-06-15 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book primarily focuses on the principles and applications of electric logging, sonic logging, nuclear logging, production logging and NMR logging, especially LWD tools, Sondex production logging tools and other advanced image logging techniques, such as ECLIPS 5700, EXCELL 2000 etc. that have been developed and used in the last two decades. Moreover, it examines the fundamentals of rock mechanics, which contribute to applications concerning the stability of borehole sidewall, safety density window of drilling fluid, fracturing etc. As such, the book offers a valuable resource for a wide range of readers, including students majoring in petrophysics, geophysics, geology and seismology, and engineers working in well logging and exploitation.
Book Synopsis Calibration and Field Test of a Pulsed, Delayed Fission Neutron Logging Probe by : John W. Reichardt
Download or read book Calibration and Field Test of a Pulsed, Delayed Fission Neutron Logging Probe written by John W. Reichardt and published by . This book was released on 1977 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Physics and Rapid Forward Modeling of Logging-while-drilling Neutron-Gamma Density Measurements by : Mathilde Michèle Luycx
Download or read book Physics and Rapid Forward Modeling of Logging-while-drilling Neutron-Gamma Density Measurements written by Mathilde Michèle Luycx and published by . This book was released on 2018 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although radioactive chemical sources have long been used in borehole nuclear tools for in-situ porosity estimation, they pose non-negligible health, safety, and environmental risks. Pulsed neutron generators were successfully introduced as replacements for americium-beryllium (AmBe) sources in neutron-based measurements. However, bulk density is still generally measured using Gamma-Gamma density tools operating with cesium-137 sources. Neutron-activated gamma-ray measurements (Neutron-Gamma) are a safer alternative to Gamma-Gamma density measurements because cesium-137 is replaced with a pulsed neutron generator. Thereafter, bulk density is estimated from neutron-induced non-capture gamma-ray counts corrected for neutron transport. Field studies with commercial Neutron-Gamma density tools revealed several practical limitations, including sensitivity to borehole conditions and decreased accuracy in high-density formations, shales, and shaly formations. The main purpose of this dissertation is to develop new measurement and interpretation procedures to mitigate such limitations. With the objective of accurately capturing the measurement physics, I designed a new theoretical, albeit realistic logging-while-drilling (LWD) Neutron-Gamma density tool. This new tool combines inputs from two gamma-ray detectors and two fast neutron detectors to deliver density accuracies that favorably compare to those obtained with traditional Gamma-Gamma density measurements, i.e., 0.013 g/cm3 in shale-free formations, and 0.019 g/cm3 in shale and shaly formations. Similar to other nuclear measurements, Neutron-Gamma density is affected by bed-boundary and layer-thickness effects that can mask the true formation bulk density when implementing conventional interpretation methods. Borehole environmental effects are additionally mitigated using empirical corrections because “spine-and-rib” compensation is impractical. However, for standoff values greater than 0.63 cm (0.25 in), such empirical corrections should be avoided as they no longer remain independent of formation properties. Three-dimensional geometrical and borehole effects can be mitigated using fast numerical simulations coupled with inversion-based interpretation. To simulate borehole LWD Neutron-Gamma density measurements, I developed a fast-forward modeling algorithm based on first-order approximations and flux sensitivity functions. The algorithm is over 500,000 times faster than industry-standard Monte Carlo methods and achieves root-mean-square errors of less than 1% (0.023 g/cm3) in formations with spatially complex geometry, including high-angle wells, thinly-bedded formations, and invaded beds. However, fast numerical simulations based on first-order approximations have limited accuracy when modeling borehole environmental effects. The Neutron-Gamma density fast-forward algorithm can improve the interpretation of measurements when standoff is less than 1.27 cm (0.5 in). Conversely, for larger values of standoff, spatial flux perturbations give rise to higher-order measurement responses that are not captured with first-order approximations, yielding density errors of up to 0.04 g/cm3 for 2.54 cm (1 in) standoff. The second part of this dissertation introduces new methods to improve borehole environmental corrections of nuclear measurements based on single-particle transport. They rely on higher-order rapid forward simulations wherein sensitivity flux perturbations are quantified using approximations to the Boltzmann transport equation. For neutron measurements, the diffusion flux-difference method is enhanced with a two-step algorithm that minimizes the size of the perturbation and yields average errors of 1 porosity unit (p.u.) in boreholes with up to 2.5-cm (1-in) standoff. For Gamma-Gamma density measurements, the gamma flux-difference (GFD) method is introduced to quantify gamma-ray flux perturbations using exponential point kernels and a Rytov approximation. This latter procedure yields maximum density errors of 0.02 g/cm3 in boreholes with up to 4.44 cm (1.75 in) standoff. The methods developed in this dissertation represent the first step toward future improvements in fast modeling of borehole environmental effects for nuclear measurements based on coupled neutron and gamma-ray transport, such as Neutron-Gamma density
Book Synopsis Geophysical Well Logging by : Jay Tittman
Download or read book Geophysical Well Logging written by Jay Tittman and published by Elsevier. This book was released on 2012-12-02 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geophysical Well Logging is a three-chapter text that discusses the physics of well logging measurements. This book describes the techniques universally used in formation evaluation, including electrical, nuclear, and sonic techniques. Chapter 1 deals with the special features of logging measurements, tool design, and the relation between logging and coring. This chapter also examines the hostile downhole environment as basic sonde configurations and combination tools. Chapter 2 discusses elementary interpretation principles, the role of logging in formation evaluation, and the uninitiated to the motivation for the wide variety of measurements found in practice. Chapter 3 investigates the physics behind electrode and induction methods for measuring electrical resistivity, as well as the concepts of geometric factor, skin effect, focused measurements, and pseudo-geometric factor. It also considers significant topics on neutron transport and moderation and their application to neutron sonde design and logging measurements; gamma-ray transport and its application to density and photoelectric-absorption logging; methods for the measurement of gamma-ray spectra; and scintillation and germanium spectrometers. This chapter further explores the body and borehole waves of the sonic methods; waves in porous media; conventional interval-transit-time techniques; and full-waveform analysis methods. Physicists, chemists, and engineers who are interested in geophysical field-measurement methods will greatly benefit from this book.
Book Synopsis Development of a Neutron Logging Tool for Uranium Exploration by : John Reichardt
Download or read book Development of a Neutron Logging Tool for Uranium Exploration written by John Reichardt and published by . This book was released on 1976 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NBS Special Publication written by and published by . This book was released on 1968 with total page 1064 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nuclear Cross Sections for Technology by : Joseph L. Fowler
Download or read book Nuclear Cross Sections for Technology written by Joseph L. Fowler and published by . This book was released on 1980 with total page 1062 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Well Logging written by Yury I. Gorbachev and published by . This book was released on 1995-05-09 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: The key well logging methods of prospecting exploration, and production of oil, gas ores, and coals are all considered in this volume. The trends in the Soviet Union's development of well logging are similar to those elsewhere, the main difference is that due to the difficulties of bringing ideas into commercial practice, Soviet scientists concentrate on the solutions to theoretical problems. This book presents some of these Russian solutions.
Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1977 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Official Gazette of the United States Patent and Trademark Office by :
Download or read book Official Gazette of the United States Patent and Trademark Office written by and published by . This book was released on 1994 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Encyclopedia of Well Log... by : Robert Desbrandes
Download or read book Encyclopedia of Well Log... written by Robert Desbrandes and published by Editions OPHRYS. This book was released on with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The aim of this book is to provide students, trainees and engineers with a manual covering all wel-logging measurements ranging from drilling to production, from oil to minerals going by way of geothermal energy. Each chapter is necessarily a summary, especially in the field of conventional measurements which are effectively described by service companies and some authors, but each topic can be followed further by means of the bibliographic lists which give the best references in each field."--Preface
Download or read book The Log Analyst written by and published by . This book was released on 1997 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the Ocean Drilling Program by : Ocean Drilling Program
Download or read book Proceedings of the Ocean Drilling Program written by Ocean Drilling Program and published by . This book was released on 1997 with total page 894 pages. Available in PDF, EPUB and Kindle. Book excerpt: