Jet Research Center Drill Collar Severing Tool P/N 101293224 Rev. K
Page 6 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
1 3/8" OD X 36.5" - HMX
589.2g
3 1/2" Drill Collar 400F 15,000psi 20,000psi
1 3/4" OD X 36.5" - HMX
993.5g
6 1/2" Drill Collar 400F 15,000psi 20,000psi
2" OD X 36.5" - HMX
1340.4g
8" Drill Collar 400F 15,000psi 20,000psi
2 5/8" OD X 36.5" - HMX
2355g
11" Drill Collar 400F 15,000psi 20,000psi
2 1/8"OD HP X 36.5" - HMX
1340.4g
8" Drill Collar 400F
1 3/8" OD X 36.5" - HNS
589.2g
3 1/2" Drill Collar 460F 15,000psi 20,000psi
1 3/4" OD X 36.5" - HNS
993.5g
6 1/2" Drill Collar 460F 15,000psi 20,000psi
2" OD X 36.5" - HNS
1340.4g
8" Drill Collar 460F 15,000psi 20,000psi
2 5/8" OD X 36.5" - HNS
2355g
11" Drill Collar 460F 15,000psi 20,000psi
Table 1: Drill Collar Severing Tools
3. Best Practices
In general it is advised to run the largest size of severing tool that can pass through the
wellbore restrictions when shooting in open hole.
In the case of severing tool operations, the main objective is to shoot the pipe in open hole
to free the pipe. Since the DCST is typically the cutter of last resort for recovery operations,
a successful cut is more important than if the recovered pipe is flared, split or otherwise
damaged.
For maximum efficiency, the best option when the DCST is used for drill collars is to shoot
the connection (shooting the box side of the connection is ideal but generally difficult to be
too precise with the positioning).
If the DCST is used to cut drill pipe, the cut can be made at either the connection or in the
tubular section of the joint. Drill pipe has a thinner wall in the tube and the cut may be more
effective.
Care should be taken when positioning the DCST for the shot. Depending on conditions,
cable creep (relaxation) can move the DCST off depth from the intended shot depth and
result in a failed attempt.
The DCST differs from a jet cutter. A Jet Cutter produces a jet which radiates in a plane to
achieve a cut. The DCST shock wave is generated by an explosive collision resulting in a
spherical wave radiating from the center of the device.
See the photos below for examples of a DCST fired directly above a drill collar connection,
which failed, and a subsequent cut directly below the first attempt but in the connection
which was successful.
To Next Page
Loading...
General