The Series 70
Short Catch Overshot is an external fishing tool specially engineered for
retrieving tubular fish when the exposed top of the fish is too short for
conventional overshot engagement. The tool utilizes a unique internal
configuration where the Basket Grapple Control is positioned above the Basket
Grapple, allowing the grapple to occupy the lowest possible position inside the
bowl.
This design
enables the overshot to securely engage and retrieve short fish efficiently
during difficult downhole fishing operations.
The Series 70 Overshot assembly consists of:
- Top Sub
- Bowl
- Basket
Grapple Control
- Basket
Grapple
Although the
tool does not include a guide assembly, its operating principle is similar to
the standard Series 150 Releasing and Circulating Overshot.
During fishing
operations, the overshot is rotated slowly to the right while being lowered
over the fish. Once the fish enters the expandable grapple system, upward pull
is applied to securely capture the fish. For releasing operations, a downward
bump force is applied to release the grapple grip before rotating and lifting
the tool from the fish.
Manufactured
using high-strength alloy materials and precision machining, GREAT Series 70
Overshots provide reliable performance, operational flexibility, and durable
service life in demanding fishing environments.
Key Features
- Specialized
short fish engagement design
- Basket
Grapple positioned at lowest bowl position
- Reliable
gripping mechanism for short tubular fish
- Simple
right-hand rotation operation
- Compact
and durable downhole construction
- Available
in Slim Hole (S.H.) and Full Strength (F.S.) types
- Wide
range of connection options
- Suitable
for complex fishing operations
Applications
- Short
Fish Retrieval Operations
- Drill
Pipe Fishing
- Tubular
Recovery Operations
- Workover
& Intervention Services
- Downhole
Fishing Applications
- Wellbore
Clean-Out & Recovery Operations
- Slim Hole
Fishing Environments
Operating
Procedure
Catching the
Fish
- Attach
the overshot to the fishing string
- Run the
tool into the wellbore
- Rotate
slowly to the right while lowering over the fish
- Stop
rotation once the fish enters the grapple
- Apply
upward pull to secure and retrieve the fish
Releasing the
Fish
- Apply
sharp downward bump force
- Rotate
slowly to the right while elevating
- Continue
lifting until the overshot releases from the fish
Advantages
- Excellent
performance for retrieving very short fish
- Improved
fish engagement reliability
- Simple
and efficient operation
- Reduced
risk of losing fish engagement
- Durable
high-strength construction
- Flexible
configuration for different fish sizes
- Wide
compatibility with various tubing and drill string sizes
- Reliable operation in challenging downhole conditions
