Environmental Engineering Reference
In-Depth Information
Water front encroachment (deploying DAS with special sensors at the producing
well in waterflood process to detect water arrival at the producer).
Vertical Seismic Profiling ( VSP ) (this number of sweep signals to make DAS com-
petitive with VSP is in the range of 20-40, which means more improvement is
still required).
Thus the days of intervening in a completed well with production logging tools
to make measurements at a single point in time have now potentially been replaced
with the possibility of “running” a PL survey as often as the operator requires.
Spatial resolution/accuracy is in the order of 10/5 cm. Strain/Temperature accuracy:
ᄆ 2ʼʵ/0.1 ᄚC.
Fig. 14.4 Raman and Brillouin backscattering. Courtesy SPE 153131
Fiber Optic Placement
Figure 14.5 shows some of the methods of deployment of fiber optic cables. The left
panel shows how the cable can be run into the well strapped between two strings of
tubing. The center panel shows the cable placed on the outside of 5½″ casing which
is cemented in place while the right hand panel shows the well-site running of a
DTS cable on 5½″ casing.
 
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