PRODUCT MANUAL
Series 70 and 150
Overshots
DOCUMENT
Manual A120
PAGE
7
FISHING TOOLS
11006 Lucerne Street | Houston, Texas 77016 | T: +1 281 219 6613 | Fax: +1 281 219 6638 | [email protected]
Revision: March 2022.
OVERVIEW
The Logan Series 150 Releasing and Cir-
culating Overshot is the most versa-tile
and commonly used fishing tool in the
industry. It is designed to externally
engage, pack-off, retrieve, and release
various types of fish, including tubing,
casing, drill pipe, drill collars, couplings,
and tool joints that have been lost or
twisted off. It is engineered to withstand
heavy pulling, torsional and jarring
strains without damaging or distorting
the tool or the fish. Its rugged construc-
tion, simplicity, and strength make the
Logan Series 150 Releasing and Cir-
cu-lating Overshot the standard choice
among all external catch fishing tools.
USE
The Logan Series 150 Releasing and
Circulating Overshot is designed to
ex-ternally engage, pack-off, retrieve,
and release various types of fish, includ-
ing tubing, casing, drill pipe, drill collars,
couplings, and tool joints that have been
twisted off or lost.
Each overshot is designed to engage,
pack-off, and pull a specific size of
tubing, casing, drill pipe, drill collars,
couplings, and tool joints, or other tools
with smooth outer diameters. With the
installation of proper undersize parts,
they may be adapted to engage and
pack-off smaller sizes.
Logan Overshots are coded (A – E) with
the following strength designations:
• A = Full Strength (FS)
For all torsional pulling and jarring
strain
• B = Extra Full Strength (XFS)
For extreme abuse
• C = Semi Full Strength (SFS)
Maximum strength for special hole
conditions
• D = Slim Hole (SH)
For heavy pulling strains only
• E = Extra Slim Hole (XSH)
For pick up jobs only
Type A (full strength) overshots are rec-
ommended when casing, hole size, and
fish size will permit.
CONSTRUCTION
The Logan Series 150 Releasing and
Circulating Overshots are constructed of
the highest quality material for strength
and efficiency.
Overshots consist of three main ex-
ter-nal parts: a top sub, a bowl, and a
guide. Internal catch and pack-off parts
are determined by the diameter of the
fish. Each assembly is designed for a
maximum catch diameter. A spiral grap-
ple, spiral grapple control, and a Type
A packer are used in the overshot bowl
when the diameter of the fish is near the
published maximum catch diameter of
the overshot.
When the diameter of the fish is
con-siderably below the maximum catch
diameter of the overshot (usually 1/2"),
a basket grapple, a mill control packer,
or basket grapple control are used in the
overshot bowl.
COMPONENTS
Gripping and Releasing Mechanism
Top Sub
The top sub is the uppermost com-
ponent of the overshot assembly. It is
equipped with a customer specified box
connection to assure proper make-up
with the fishing string.
Bowl
The bowl, the major working component
of the overshot, is located between the
top sub and the guide.
The inside diameter features a threaded
section that conforms to the exterior
threads of the grapple. This design
permits any expansion or compression
strain to be evenly distributed over the
entire working surface of the bowl, grap-
ple, and the fish. Any possible damage
to the fish or overshot is minimized.
Guide
The lowermost component of the over-
shot assembly is the guide. As its name
implies, it guides the fish into the in-
ter-nal gripping mechanism (grapple) of
the overshot. The guide also minimizes
possible damage to the overshot by
blocking the entry of a fish that exceeds
the maximum catch size of the overshot.
Grapples
The grapple fits into the bowl and is the
gripping mechanism of the overshot.
There are two basic types of grapples:
spiral and basket.
