PETE 406

1
PETE 406

• Fishing Operations

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Outline

• Cardinal Rules
• Pipe Sticking
• Determining the Stuck Point
• Parting the Pipe String
• Catch Tools
• Jarring
• Wash-over

• Loose-Junk
• Mills and Rotary Shoes
• Wireline Fishing
• Stuck Packers
• Fishing in Cavities

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Cardinal Rules

• Evaluate the situation
• Communicate
• Collect complete information
• Notify the fishing tool company
• All parties understand the situation
• Keep all parties informed

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Cardinal Rules

• Gather information
• OD, ID, length of fishing string
• Know limitations of fishing string
• Accurate weight indicator
• Locate the top of the fish
• Determine freepoint
• Leave one to two joints above freepoint

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Cardinal Rules

• Keep track of pipe tallies
• Do not rotate fishing string
• Do not pull out of the rope socket

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Pipe Sticking

• Sand Sticking
• Mud Sticking

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Pipe Sticking

• Mechanical Sticking
• Stuck packers
• Multiple strings wrap around
• Crooked pipe
• Junk in the hole

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Mechanical Sticking
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Pipe Sticking

• Keyseat

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Pipe Sticking

• Cement Sticking

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Pipe Sticking

• Undergauge Hole

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Pipe Sticking

• Differential Sticking

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Blowout Sticking
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Lost Circulation Sticking
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Sloughing-Hole Sticking
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Determining the Stuck Point

• DL Pipe Stretch,in
• L Length of free pipe, ft
• E Modulus of Elasticity
• a cross section of pipe
• SC Stretch constant
• FPC Free point constant

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Determining the Stuck Point

• SC 0.4/as
• FPC 2500 X as
• There are stretch tables and stretch graphs
  available

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Determining the Stuck Point

• The best way though is with a Freepoint tool.
• This is a wireline tool that is run inside the
  stuck pipe.
• Periodically (based on calculations) the pipe is
  stretched and rotated.
• The freepoint tool detects movement in the pipe.
  
• If there is no movement, the pipe is stuck.
• The deepest point where the freepoint tool
  detects movement is the freepoint

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Parting the Pipe String

• Backoff
• Chemical Cut
• Jet Cut
• Mechanical Cut

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Backoff

• Blind backoff
• Backoff tool
• Inside
• outside

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Chemical Cut
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Jet Cut
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Mechanical Cut
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Catch Tools

• Overshot
• Basket Grapple
• Spiral Grapple

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Catch Tools

• Spear

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Jarring Assembly
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Wash-over
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Loose-Junk
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Mills and Rotary Shoes