Well and Field Monitoring - Cased-Hole Log Analysis and Reservoir Performance Monitoring - page 248

Fig. 14.7 DTS monitoring of a fracking operation. Courtesy SPE 118831
Post operational analysis is also made possible by the use of the DTS system to
monitor changes in wellbore temperature with time after the treatment has been
made. Figure 14.8 depicts the process of fracking stage 2 of the same well. The
perforations are at depth of 9,129-9,139 ft. During the process of fracturing, a broad
cooling response from 8,945 to 9,220 ft is recorded which demonstrates a very large
annular communication resulting from a poor cement job in the annulus. The warm-
back profile of stage 1 demonstrates a constrained transverse fracture extension
from stage 1 perforations.
Fig. 14.8 DTS fracking and “Warm-back” monitoring. Courtesy SPE 118831