PETE 406PETE 406

Fishing OperationsFishing Operations

OutlineOutline

• Cardinal RulesCardinal Rules• Pipe StickingPipe Sticking• Determining the Determining the

Stuck PointStuck Point• Parting the Pipe Parting the Pipe

StringString• Catch ToolsCatch Tools• JarringJarring• Wash-overWash-over

• Loose-JunkLoose-Junk• Mills and Rotary Mills and Rotary

ShoesShoes• Wireline FishingWireline Fishing• Stuck PackersStuck Packers• Fishing in CavitiesFishing in Cavities

Cardinal RulesCardinal Rules

• Evaluate the situationEvaluate the situation

• CommunicateCommunicate– Collect complete informationCollect complete information– Notify the fishing tool companyNotify the fishing tool company– All parties understand the situationAll parties understand the situation– Keep all parties informedKeep all parties informed

Cardinal RulesCardinal Rules

• Gather informationGather information– OD, ID, length of fishing stringOD, ID, length of fishing string– Know limitations of fishing stringKnow limitations of fishing string– Accurate weight indicatorAccurate weight indicator– Locate the top of the fishLocate the top of the fish– Determine freepointDetermine freepoint– Leave one to two joints above freepointLeave one to two joints above freepoint

Cardinal RulesCardinal Rules

• Keep track of pipe talliesKeep track of pipe tallies

• Do not rotate fishing stringDo not rotate fishing string

• Do not pull out of the rope socketDo not pull out of the rope socket

Pipe StickingPipe Sticking• Sand Sticking Sand Sticking

• Mud StickingMud Sticking

Pipe StickingPipe Sticking

• Mechanical StickingMechanical Sticking– Stuck packersStuck packers– Multiple strings wrap aroundMultiple strings wrap around– Crooked pipeCrooked pipe– Junk in the holeJunk in the hole

Mechanical StickingMechanical Sticking

Pipe StickingPipe Sticking

• KeyseatKeyseat

Pipe StickingPipe Sticking

• Cement StickingCement Sticking

Pipe StickingPipe Sticking

• Undergauge Undergauge HoleHole

Pipe StickingPipe Sticking

• Differential Differential StickingSticking

Blowout StickingBlowout Sticking

Lost Circulation StickingLost Circulation Sticking

Sloughing-Hole StickingSloughing-Hole Sticking

Determining the Stuck PointDetermining the Stuck PointL= Pipe Stretch,inL= Pipe Stretch,in

• L = Length of free pipe, L = Length of free pipe, ftft

• E = Modulus of ElasticityE = Modulus of Elasticity

• a = cross section of pipea = cross section of pipe

• SC = Stretch constantSC = Stretch constant

• FPC = Free point FPC = Free point constantconstantF

FPCLL

SCLFL

aE

LFL

s

12

Determining the Stuck PointDetermining the Stuck Point

• SC = 0.4/aSC = 0.4/ass

• FPC = 2500 X aFPC = 2500 X ass

• There are stretch tables and stretch There are stretch tables and stretch graphs availablegraphs available

Determining the Stuck PointDetermining the Stuck Point

• The best way though is with a Freepoint The best way though is with a Freepoint tool.tool.

• This is a wireline tool that is run inside the This is a wireline tool that is run inside the stuck pipe. stuck pipe.

• Periodically (based on calculations) the pipe Periodically (based on calculations) the pipe is stretched and rotated.is stretched and rotated.

• The freepoint tool detects movement in the The freepoint tool detects movement in the pipe. pipe.

• If there is no movement, the pipe is stuck.If there is no movement, the pipe is stuck.• The deepest point where the freepoint tool The deepest point where the freepoint tool

detects movement is the freepointdetects movement is the freepoint

Parting the Pipe StringParting the Pipe String

• BackoffBackoff

• Chemical CutChemical Cut

• Jet CutJet Cut

• Mechanical CutMechanical Cut

BackoffBackoff

• Blind backoffBlind backoff

• Backoff toolBackoff tool– InsideInside– outsideoutside

Chemical CutChemical Cut

Jet CutJet Cut

Mechanical CutMechanical Cut

Catch ToolsCatch Tools

• OvershotOvershot

• Basket GrappleBasket Grapple

• Spiral GrappleSpiral Grapple

Catch ToolsCatch Tools

• SpearSpear

Jarring AssemblyJarring Assembly

Wash-overWash-over

Loose-JunkLoose-Junk

Mills and Rotary ShoesMills and Rotary Shoes