Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 322 for “"borehole"”.
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Seismic borehole tomography
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1988.
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Borehole effects on downhole seismic measurements
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1994.
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Borehole Breakouts in Transversely Isotropic Posidonia Shale
Borehole instabilities are frequently encountered when drilling through finely laminated, organic rich shales (Økland and Cook, 1998; Ottesen, 2010; etc.); such instabilities should be avoided to assure a successful exploitation and safe production of the contained unconventional hydrocarbons. …
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Resolving Terrain Effects in Borehole Temperature Profiles
<p>The study of borehole paleoclimatology aids scientists in determining past climate changes and in understanding current climate trends. Accurate borehole temperature logs are necessary to obtain a useful temperature profile. However, as many climate workers have discovered, borehole temperature …
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Waterflood monitoring using borehole self-potential data
… water flooding of an oil reservoir. I simulate borehole electric potentials associated with a two-phase flow between two wells in a heterogeneous reservoir. The flow of the water phase generates a source (streaming) current density, which is responsible for the occurrence of an electrical field …
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Borehole electroseismic phenomena : field measurements and theory
A Stoneley wave propagating in a borehole generates a flow of pore fluid in permeable zones intersected by the borehole. In turn, this flow of pore fluid induces a streaming electrical field. This thesis is an experimental and theoretical investigation of the electrical fields induced by Stoneley …
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Combination of Borehole Seismic and Downhole Logging to Investigate the Vicinity of the COSC‑1 Borehole in Western Scandinavia
In dieser Arbeit werden bohrlochseismsiche Messungen sowohl mit Bohrlochmessungen als auch mit oberflächenseismischen Messungen ausgewertet und verglichen um das bohrlochnahe Umfeld der Forschungsbohrung COSC-1 (Collisional Orogeny in the Scandinavian Caledonides) zu beschreiben. Die …
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Numerical modelling of geothermal borehole heat exchanger systems
… This work is concerned with the modelling of borehole heat exchangers (BHEs), the commonest form of ground heat exchangers found in GSHP systems. Their careful design is critical to both the short timescale and long timescale performance of geothermal heat pump systems. Unlike conventional …
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Effects of borehole stability on well log data
In this thesis we analyze the effects of borehole irregularities on well logs and develop methods to obtain reliable formation properties from such logs. Data from a well in eastern Venezuela are analysed. Borehole irregularities in this well consist mainly of borehole enlargements perpendicular to …
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Fracture characterization from seismic measurements in a borehole
… fractures using seismic measurements in a borehole. We first develop methods to characterize a fracture intersecting an open borehole by studying tubewave generation and attenuation at the fracture. By numerically studying the dispersion relation for fluid pressure in the fracture, we show …
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Analytical and Experimental Study on Coaxial Borehole Heat Exchangers
… geothermal energy considering a coaxial borehole heat exchanger (BHE) as a major component in a ground-source heat pump (GSHP) system. A GSHP system is a sustainable energy system that transfers thermal energy between the surrounding ground and the conditioned space of a building. Various …
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Canister design for deep borehole disposal of nuclear waste
… nuclear fuel and other high-level waste in deep borehole repositories using currently available and proven oil, gas, and geothermal drilling technology. The canister is suitable for disposal of various waste forms, such as fuel assemblies and vitrified waste. The design addresses real and …
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A drop-in-concept for deep borehole canister emplacement
Disposal of high-level nuclear waste in deep boreholes drilled into crystalline bedrock (i.e., "granite") is an interesting repository alternative of long standing. Work at MIT over the past two decades, and more recently in collaboration with the Sandia National Laboratory, has examined a broad …
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Formation property estimation from guided waves in a borehole
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1987.
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Multiattribute utility functions for the deep borehole filter restoration problem
… decision problems using the example of the deep borehole filter restoration problem from the uranium extraction industry. In this problem, the filter of the production borehole (or well) is periodically contaminated or clogged, causing significant uranium output reduction. The efficient modeling …
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A 500kHz-5MHz CW stepped frequency borehole tomographic imaging system
This dissertation involves a study of Cross-Borehole Tomography. The mathematical physical models of the Radon Transform are reviewed. The entire Cross-Borehole Tomographic process is simulated, based on these physical models of the Radon Transform. The system specifications for the final design …
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Elastic wave propagation along a borehole in an anisotropic medium
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1990.
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Long-term ground response For borehole heat exchangers in clay
… to transfer heat to and from the ground via borehole heat exchangers is among the most energy efficient techniques for space heating and cooling. Designs for seasonal heat exchange systems are becoming increasingly popular in urban environments to reduce energy costs and contribute in …
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A ray model for head waves in a fluid-filled borehole
… source on the axis of an ideal fluid-filled borehole. An impulse response is derived, and its frequency characteristics are investigated. The waves are compared to those obtained by the real axis integration method of Tsang and Rader, which results in a complete waveform, including the modes …
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