Environmental Engineering Reference
In-Depth Information
Comments
Joint from 2090 to 2130 ft has moderate outside-wall corrosion which becomes
severe below about 2115 ft. A through hole appears to exist at 2116 ft. Note decrease
in ETT phase shift from good casing above and along joint, verifying severe corro-
sion. Joint from 2130 to 2170 ft has moderate to severe interval-corrosion from
2130 to 2155 ft, and corrosion on inside is increasingly severe for remainder of
joint. ETT verifi es increasingly severe corrosion in lower part of joint from about
2130 to 2170 ft.
Borehole Televiewers
Three visualization tools are available for borehole scanning. The oldest is the
Borehole Televiewer (BHTV) which uses a rotating ultrasonic transmitter and
receiver to produce an image of the borehole or casing. An example of the BHTV
log is given in Fig.
13.17
.
Fig. 13.17
BHTV log
showing perforations (
left
)
and split casing (
right
)
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