Jet Research Center
Drill Collar Severing Tool
P/N 101293224 Rev. K
Page 17 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
6.
Disarming and Disassembly Procedures with Electric Detonators
In the event of having to disarm and disassemble the DCST use the following procedure.
If the DCST was run in the well but was unable to detonate it is imperative to use these
procedures to remove the cutter and detonator assembly before attempting to perform any
investigation and testing to find the problem.
If the DCST is run into a well and returned to surface without detonating JRC normally
recommends the replacement of all explosive components and o-ring seals. JRC always
recommends the replacement of all explosive components and o-ring seals if the cutter has
been exposed to temperatures or pressures significantly above ambient conditions.
6.1 The same safety procedures applied while assembling and arming the cutter apply for
disarming and disassembly. While the cutter is still deeper than 200 feet (70 m) below
the ground level on land or 200 feet (70 m) below the sea bed offshore; ensure that
cable is in the
‘SAFE’
position; grounding lines are attached; If required
‘Radio Silence’
is in place; and that the disassembly and disarming area is clear of non-essential
personnel.
6.2 Remove the DCST from the adapter (11), while monitoring the disassembly for
indications of trapped pressure.
6.3 Install the protective holder (17) over the adapter (11), extension mandrel (10) and
detonator assembly (13).
6.4 Lay the DCST explosive assembly safely aside while disarming the detonator.
6.5 Disconnect the firing head (19) and extension mandrel, with detonator assembly
adapter and protective holder attached, from the tool string and install the shunt plug
(16) into the top of the firing head.
6.6 Remove the protective holder and adapter from the extension mandrel.
6.7 Disassemble the detonator assembly from the extension mandrel and re-shunt with
appropriate wire.
6.8 Return the detonator with associated labeling to its original packaging and label
appropriately for further use or disposal and store appropriately.
6.9 Disassemble the DCST assembly and return its contents to its original packaging with
appropriate labeling and store appropriately.
WARNING
BE AWARE OF POTENTIAL TRAPPED PRESSURE WHEN BREAKING
CONNECTIONS ON THE TOOLSTRING ASSEMBLY.
