Final report for SNL/NM environmental drilling project Page: 69 of 109
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Depth Start 34.4 ft. (relative to grade at entry)
End 31.5 ft.
148 ft. solid, 420 ft. to 568 ft.
Horizontal 415.9 ft. to 536 ft. - at surface
MSL 364 ft. (grade at exit)
Coordinates (Plant)
South end (entry) East 48604.04 North 102209.05
North end (exit) East 48719.33 North 102758.78
Distance between casing end points at the surface 561.7 ft.
Plant North is 36 deg. 22 min. west of True North
Declination is 4 deg. 21 min. west
CRITIQUE
Drill Performance: The X-810 experimental boring unit had undergone only slight
modifications since its use at M-Area at this same location in June. These changes primarily
involved the water injection and the breakout systems. The only problem encountered were
some slight damage to the survey tool during assembly and the drive end breakout system got
fouled with rod grease causing it to fail. Each of these items are easily corrected.
The launch pit worked very well. Because of the intercept of the old well and the subsequent
fact of having to deal with the casing from the June attempt the forces required of the drill
were higher than those observed in June. The drill frame held its position very well and only
slight motion occurred and it did not require extra attention to the anchor system. The only
pit associated problem was the water which accumulated during the heavy rain on Thursday.
The rain also caused the west bank of the pit to become unstable and it is recommended that
if possible the sides not used by the drill be sloped to provide better access to each side of the
machinery.
Steering Tool: The steering tools were the same ones that had been used before and worked
well except as before the azimuth produced some inconsistent readings at this near north
heading. Since the bit was in the old hole from RI = 25 ft. the steering tool depth data was
compared with that acquired in June. The only real difference was in depth where a portion
of the new track appeared to be about 1 ft. deeper this time. This is not surprising since the
inclination calibration was off and all calculations were done by hand during the first attempt.
All readings from the newly calibrated survey tool were entered in a laptop computer which
kept track of all the data and did a running plot which improved the steering bookkeeping.
Casing: The casing performed very well with no difficulties during assembly or pull back.
The only disadvantage encountered was the 30 ft. joints made the two ends of the casing
terminate without threaded ends. If a couple of 10 ft. lengths had been available the surface
completion would have been a little easier. Samples of the casing material have been
provided to Sandia Org. 1723 for analysis of the temperature driven off gas by-products to
150 deg. C. This work is now (Nov. 1992) in progress and will be reported separately.A-14
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Wemple, R. P.; Meyer, R. D.; Staller, G. E. & Layne, R. R. Final report for SNL/NM environmental drilling project, report, November 1, 1994; Albuquerque, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1280825/m1/69/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.