Jet Research Center Drill Collar Severing Tool P/N 101293224 Rev. K
Page 7 of 20
Jet Research Center, 8432 South I-35W, Alvarado, Texas, 76009-9775, USA
Telephone 1-817-761-2000; Toll Free 1-800-451-5403; Fax 1-817-783-5812; Website www.jetresearch.com
For maximum effectiveness, a Free Point Log should always be run prior to any cutter so
the cut is made at the proper depth. The tool will not free the string if initiated below or at
the stuck section of pipe.
If possible, tension should be applied to the drill string prior to tool initiation in order to
increase the likelihood of severance. The amount of over pull to be applied above string
weight at the desired cut depth should be determined by the drilling representative and not
exceed safe working limits of the pipe.
Figure 1: Example of failed cut attempt above drill collar connection
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General