(TI-59) Borehole Geometry

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An excerpt from Calculating borehole geometry from standard measurements of borehole inclinometry, US-ACoE, CRREL, Special Report 84-15, June 1984, 19 pages

"ABSTRACT
This report describes two new methods for computing borehole geometry from
discrete measurements of borehole inclination.(e) and azimuth (a). In the first
method e and a 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 e and a to vary quadratically with arc length between
three measuring points, improve.s 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.
…
CONTENTS                                                                    page
…
Appendix A: Texas Instruments TI-59 calculator program for
  linear-variation model------------------------------------    9
Appendix B: Texas Instruments TI-59 calculator program for
  quadratic-variation model---------------------------------  15
…"

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