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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