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Teledrift Argentina
Training Course
Tema 9-2
Pesca a pozo abiertoBasics
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Qu es una pesca ??
What Constitutes a Fishing Job? Anti!e there is an
impedimentto continued drilling or production" #$a!ples%
A stuck or parteddrill string or B&A"
'oosejunkthat !a i!pede drilling( causing da!age to all coring e)uip!ent"
'ogging toolsstuckor *ireline parted during logging operations"
+r ,ust a need to change the directionof the *ellbore"
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Evaluate the Problem
What is in the hole?
-s the drilling string stuc.?
What is the B&A /Botto! &ole
Asse!bl0
Where is the top of the fish( if the
string is parted?
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Gather Information
Get accurate fish description and dimensions.
Have background information such as:
Formation type at fish top.
Mud type and weight throughout system.
Casing sies! weights and depths.
"peration at time of troub#e.
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Communication
Be clear and precise( use *ritten co!!unication
*hen possible"
-nsure that all concerned parties understand and
agree on the procedures to be used"
1eep all concerned parties infor!ed throughout
e$ecution of procedures"
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$ossib#e reasons for stuck dri##ing
strings. Differential Sticking (Was there mud loss pryor to
being stuck? or a possible gas kick?)
Mechanical Sticking:
!ossible "ey seats in #ellbore ($ot stuck coming out
of the %ole?)
&unk in the hole from damaged or lost e'uipment.
nade'uate hole cleaning such as rig do#ntime or
circulation problems.
*nder gauged hole ($ot stuck follo#ing pulled under
gauged drilling bit.)
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Differential ticking
-ndications%
2rill ste! cannot be rotated( raised( or lo*ered(
but circulating pressure is nor!al" Part of the drill string is across a per!eable
for!ation" Chec. pre3ious drilling records to
chec. for possible for!ation candidates"
The !ud contains large )uantities of drilled solids"
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Pegado por Presi!n Diferencial
'as barras dde
sondeo )uedan en
contacto con una
for!aci4npermeab#e e$puestaen el pozo
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2ifferential 5tic.ing
5olutions%
6educe the !ud *eight" 78"9:; "9: < 78:
5pot oil" Free point and bac. off"
Jar"
Washo3er"
=easured 2epth 79(>>>
True @ertical2epth 7>(>>> ">9 7>(>>> "9
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