PRODUCT MANUAL
Series 70 and 150
Overshots
DOCUMENT
Manual A120
PAGE
11
FISHING TOOLS
11006 Lucerne Street | Houston, Texas 77016 | T: +1 281 219 6613 | Fax: +1 281 219 6638 | [email protected]
Revision: March 2022.
Sheared Drill Pipe
Inside Blowout Preventer
Mill Operation
The Series 150 Overshot outfitted with a mill
extension and a special long guide with a soft
metal bottom.
Sheared Drill Pipe Retrieval
The Series 150 Overshot outfitted with a basket
grapple, mill control packer, top sub extension,
and a special short guide with a soft metal
bottom.
SHEARED DRILL PIPE RETRIEVAL
The long length of the guide also pre-
vents the mill extension from touching
and causing damage to the tool joint in
the BOP. This is of utmost importance as
the outer diameter of this joint is where
the string will be engaged.
After milling is completed, The Logan
Series 150 Releasing and Circulating
Overshot is elevated to the surface. It
is then dressed with a flat-bottomed
short guide, an extension sub, a basket
grapple, and a mill control packer sized
to engage the tool joint. The overshot is
lowered again. As the BOP is entered,
the milled flare-end will pass through
the grapple and the mill control packer.
Once in the extension sub, the grapple
will engage and pack-off the tool joint.
Exert an upward pull on the overshot
to ensure enagement. Then retract the
BOP pipe rams. Raise the string to the
rig floor and remove the severed joint.
Replace the joint and resume normal
operations.
Logan Sheared Pipe Retrieval Overshot
assemblies are available for all sizes
of drill pipe and BOPs. Please inquire.
