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One problem with inside fishing necks

is that debris may prevent the prong

from entering and latching.

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Inside fishing neck for a GS running tool

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Fish Type and Dimensions

Many fishing tools only catch on limited size range(OD or ID)

When dimensions of fish are known:

Prepare accurate fishing diagramPrepare wellbore or completion diagram

Factors influencing selection of tools/techniques:Fish stuck/free

Fill or junk on top of fishFish material properties

e.g. small ferrous objects retrieved by magnetic devices

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Fishing Diagram - Fishing NeckDetail

4.250 in.3.500 in.

2.000 in. 1.500 in.

3.750 in.

2.313 in.2.000 in.

1.813 in.Depth to top of fish

3455.50 ft

Wellbore tubular

Fish OD and length information

are presented in a general

fishing diagram

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The top of a gas lift

valve, bent over in the

wellbore.

DHV Inc.

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Wellbore and CompletionGeometry

Minimum tubular or restriction sizeDetermines maximum OD of CT/toolstring which can be used

When assessing drift clearances

Consider removal of fillPressure differential may exist across the fishCan force toolstring up or down wellbore

When determining overpull available at fish

Consider wellbore geometry

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Bailer Bottom

Flapper in the bottom of the bailer

tube.

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Tools for running and retrieving gas lift valves note:

maximum length of tools and valve or dummy must fit into the

tool body. Latching too long a valve can stick assembly.

Detent finger on tool body indexes tool and orients for

running and retrieval.

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