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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 31 to 40 of 234 (0.05 seconds)| 31 |
Vibration and shock amplification of drilling toolsVijayan, Kiran January 2012 (has links)
No description available.
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| 32 |
Avoiding borehole failure by time-dependent stability analysis of stressed poroelastic rocksHodge, Martin Owen, Petroleum Engineering, Faculty of Engineering, UNSW January 2006 (has links)
Wellbore stability is a critical issue when drilling through tectonically stressed and complex geological conditions. Understanding wellbore stability issues before a well is drilled enables better planning of the drilling operation and helps to avoid borehole failure. This is of particular importance in underbalanced drilling where we are limited with our choice of drilling mud densities. This thesis examines the impact of fluid pressure change on wellbore stability during underbalanced drilling by using a timedependent poroelastic model. The poroelastic behaviour is analysed using numerical and analytical models. The finite element method (FEM) is used for the numerical model. Some simple techniques are developed and implemented to increase the speed and stability of the FEM solution. The common assumptions of plane strain and plane stress are explored. It is shown that the plane strain assumption results in high error while the error for plane stress is low. It is also shown that use of plane strain predicts more instability than use of plane stress and the stability difference is significant. From this it is concluded that the plane stress assumption should be used instead of the commonly used plane strain assumption. A sensitivity analysis is conducted to demonstrate the effect of several variables on wellbore stability during underbalanced drilling. These variables include mean in-situ horizontal stress, deviatoric in-situ horizontal stress, bulk compressibility and permeability. I various ways changes in these variables were shown to change the chance of shear failure, early time tensile failure through exfoliation and late time tensile failure through hydraulic fracture initiation.
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| 33 |
A numerical and experimental investigation of rectangular abrasive jets for drilling operationsYin-Shing, Chong 21 April 1995 (has links)
Graduation date: 1995
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| 34 |
Machining and drilling of hybrid composite materials /Kim, Dae-Wook. January 2002 (has links)
Thesis (Ph. D.)--University of Washington, 2002. / Vita. Includes bibliographical references (leaves 231-236).
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| 35 |
Development and applications of a drilling process monitoring system for pneumatic drills /Sugawara, Jun. January 2002 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2002. / Includes bibliographical references (leaves 117-120).
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| 36 |
The stovepipe or California method of well drilling as practiced in ArizonaSchwalen, Harold Christy, 1895-1987 January 1924 (has links)
No description available.
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| 37 |
Cost parameters of drillings in mining explorationsDeWilliam, Patrick P., 1920- January 1967 (has links)
No description available.
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| 38 |
Application of drill monitoring to rock mass characterizationPeck, Jonathan Philip. January 1986 (has links)
No description available.
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| 39 |
Rock breakage in percussive drilling.Drouin, Claude. January 1971 (has links)
No description available.
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| 40 |
Design of a device for drilling long, small-diameter tunnelsUppaluri, Baparao 12 1900 (has links)
No description available.
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