Description

Design Features

The Conical Side Entry Sub (CSES).

Specifications

Conical SideEntry Sub

♦ Stronger than the drill string and thus does notpresent a weak point when in the drill string.

♦ Allows for normal circulation through the drill stringwhether logging tools are in the drill string or not.

♦ Both right and left hand torque may be applied tothe CSES while attempting to free stuck pipe. (Log-ging tools must be removed from the drill string be-fore applying torque or rotating the drill string.)

The Conical Side Entry Sub (CSES) is designed to allowlogging tools and the associated logging line to enterthe drill string through a port in the side of the tool.This allows pipe to be added to, or removed from, thedrill string above the CSES during logging operations.When logging through the CSES, the drill string canbe raised or lowered independent of the logging tools.Therefore, in unstable holes, the drill string can be raisedor lowered as needed to protect the logging tools andkeep the borehole open, independent of the actuallogging operation.

ODP Logging Services, Lamont-Doherty Earth Observatory, Rt. 9W, Palisades, NY 10964

Schematic diagram of the CSES.

Drillpipe Connection

Removable Line Wiper

Side Entry Port forLogging Tools & Wireline

Float Valve

Logging Tool

Drillpipe Connection

23' 4-3/8"O.A.L.

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During lo

ggin

g o

pera

tions in

unsta

ble

hole

s, t

he C

SE

S

allo

ws t

he d

rill

str

ing t

o b

e r

ais

ed o

r lo

were

d a

s r

e-

quired t

o p

rote

ct

the l

oggin

g t

ools

and t

o k

eep t

he

bore

hole

open.

Loggin

g t

ools

are

loaded into

the d

rill

str

ing t

hro

ugh

the C

SE

S fro

m the r

ig flo

or

in m

uch the s

am

e w

ay a

s

they a

re loaded thro

ugh o

pen e

nded p

ipe.

Should

the d

rill

pip

e b

ecom

e s

tuck, th

e loggin

g tools

can b

e retr

ieved w

ithout h

avin

g to

bre

ak th

e d

rill

str

ing.

Appro

xim

ate

ly 6

hours

of

rig t

ime a

re r

equired t

o r

ig

up a

nd r

ig d

ow

n the C

SE

S.

The d

rill

str

ing c

annot

be r

ota

ted w

hile

loggin

g t

ools

are

insid

e,

havin

g b

een l

oaded t

hro

ugh t

he C

SE

S

sid

e p

ort

. T

his

se

ve

rely

lim

its t

he

ab

ility

to

bre

ak

thro

ugh b

ridges a

nd f

ree s

tuck p

ipe.

If the d

rill

str

ing b

ecom

es s

tuck w

hile

loggin

g thro

ugh

the C

SE

S, th

e lo

ggin

g tools

must be retr

ieved thro

ugh

the o

pen w

ate

r colu

mn.

If t

he w

irelin

e b

ecom

es s

tuck w

hile

loggin

g t

hro

ugh

the C

SE

S,

the K

inle

y c

utter

crim

per

can o

nly

be d

e-

plo

yed if th

e C

SE

S is a

ccessib

le fro

m the m

oonpool

or

rig f

loor.

Gre

ate

r riggin

g tim

e required v

s. short

er ru

nnin

g tim

e.

Pers

onnel are

exposed t

o w

ork

conducte

d o

ver

the

open m

oonpool.

Th

e d

rill

str

ing

ma

y b

e a

t ri

sk d

uri

ng

ba

d w

ea

the

r

conditio

ns if

the u

pper

guid

e h

orn

is n

ot in

use d

uring

CS

ES

loggin

g o

pera

tions.

Ad

va

nta

ge

s

Dis

ad

va

nta

ge

s

Sp

ecia

l C

on

sid

era

tio

ns

��Lo

gg

ing

To

ol

Co

nic

al S

ide

En

try S

ub

Lo

gg

ing

Ca

ble

Re

-en

try C

on

e

Re

-en

ter

ho

le a

nd

ru

n p

ipe

an

d lo

gg

ing

to

ol to

bo

tto

m

of

bo

reh

ole

Re

trie

ve

pip

e a

nd

lo

gg

ing

too

l sim

ulta

ne

ou

sly

Pu

ll u

p p

ipe

to

exp

ose

log

gin

g t

oo

l in

op

en

ho

le

Co

nic

al S

ide

En

try S

ub

De

plo

ym

en

t

11/2001