Environmental Engineering Reference
In-Depth Information
Noise and Temperature Combinations
Often a judicious combination of a noise log with a temperature survey can provide
a superior analysis than could be obtained from either one singly. It is now possible
to make accurate heat transfer models of the formations traversed by a well based
on thermal conductivity and specifi c heat data and/or assumptions. When coupled
with spectral noise analysis and/or fl owmeter profi les obtained in the borehole a
much more accurate and precise picture can be drawn of the fl ow of fl uids into, out
of, and around the cased well. Figure 9.8 illustrates a combination of noise and
temperature logging where the challenge was to quantify the relative production
from two perforated zones. Temperature logs were run both during production and
after shut-in and warm-back was permitted. During the dynamic fl ow period a noise
spectrum was also recorded as shown in the right-hand track. The color coded
images show the noise amplitude (dB) by the colored band (red is loud, blue is qui-
eter) across the track and the noise frequency distribution via position from the left
edge of the track (100 Hz on the left, 30 kHz on the right).
Fig. 9.8
Combination noise and temperature logs. Courtesy TGT
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