Introduction - Cased-Hole Log Analysis and Reservoir Performance Monitoring - page 6

Well bore
High pressure
water sand
Casing leak
Water channel along
bad cement job
Low pressure
oil reservoir
Fig. 1.5 Water production through casing leak and channel leak. Reprinted by permission of the
Petroleum Engineer International from Cesak and Schultz (1956)
Tools for Completion Inspection
Tools for monitoring the mechanical status of the completion string include:
Cement bond logs: (CBL, CET)
Casing-collar logs: (CCL)
Casing inspection logs: (ETT, PAL, calipers)
Casing potential logs
In addition to these direct measurements of the status of the completion string,
all the fl uid typing and monitoring tools may be used to infer completion problems.
For example, a temperature log may indicate a tubing leak.
Quick Reference to Production Logging Tools
Table 1.1 summarizes the majority of the common production logging tools and
their spheres of measurement. Examples of each type of log will be shown in the
chapters that follow.