Calculating Borehole Geometry from Standard Measurements of Borehole Inclinometry.

This report describes two new methods for computing borehole geometry from discrete measurements of borehole inclination (theta) and azimuth (alpha). In the first method theta and alpha are assumed to vary linearly with arc length. This results in an analytic model of the borehole that is continuous...

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Bibliographic Details
Main Authors: Jezek,K C, Alley,R B
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Format: Text
Language:English
Published: 1984
Subjects:
Snow
Ice and Permafrost
Theoretical Mathematics
*BOREHOLES
MATHEMATICAL MODELS
MEASUREMENT
TRANSFORMATIONS(MATHEMATICS)
APPROXIMATION(MATHEMATICS)
SLOPE
GEOMETRY
AZIMUTH
GREENLAND
CALCULATORS
ICE CAPS
CARTESIAN COORDINATES
Linear variation models
Quadratic variation models
Inclinometry data
Greenland
Dye 3
Dye-3
Ice
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA145006
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA145006
Description
Summary:This report describes two new methods for computing borehole geometry from discrete measurements of borehole inclination (theta) and azimuth (alpha). In the first method theta and alpha are assumed to vary linearly with arc length. This results in an analytic model of the borehole that is continuous but not smooth. The second model, which takes theta and alpha to vary quadratically with arc length between three measuring points, improves the smoothness of the model but the analysis must be carried out numerically. These models were applied to the borehole inclinometry data collected at DYE-3, Greenland. The methods were found convenient to use and it is claimed that the results represent physically reasonable approximations to the borehole geometry. (Author)

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