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7/24/2019 SPE 00022720 Pressure Pulse Controlled DST System Iris Valve
1/8
S
SPE 7
Testing Green
anyon Wells With a
Pressure Pulse ontrolled
DST System
J.C. Healy, * Mobil Oil Corp., and J.P. Maratier* and M.W. Fruge, Schlumberger
SPE
Members
Copyright 1991, Society of Petroleum Engineers Inc.
This paper was prepared for presentation at the 66th Annual Technical Conference and Exhibition of the Society of Petroleum Engineers held
in Dallas, TX, October 6 9 1991.
This paper was selected lor presentation by
an
SPE Program Committee following review of information contained in
an
abstract submitted by the author s . Contents of the paper,
as presented, have not been reviewed by the Society of Petroleum Engineers and are subject to correction by the author s . The material, as presented, does not necessarily reflect
any position of the Societyof Petroleum Engineers, its officers, or members. Papers presented at SPE meetings are
bject
to publication review by Editorial Committees of the Society
of Petroleum Engineers. Permission to copy
is
restricted to
an
abstract of notmore than300words. Illustrations maynot be copied. Theabstract should contain conspicuous acknowledgment
of where and by whom the paper
is
presented. Write Publications Manager, SPE, P.O. Box 833836, Richardson, TX 75083-3836 U.S.A. Telex, 730989 SPEDAL.
STR CT
Green Canyon development w ells are perforated
and tes ted using the IMPULSE* t e s t ing method
before completion or recomplet ion
This
method
allows a control led underbalance s t imula t ion of
unconsolidated format ions
so
t ha t an i n i t i a l
reservoi r pressure an d reservoi r data
can
be
obta ined
A
pressure pulse
controlled d r i l l
stem
t e s t DST system i s used to carry out these
well tes t ing operat ions
This new DST contro l concept
overcomes
some
of
the l imi ta t ions
o f co nv en tio nal
DST
t oo l s ;
equipment
r e li ab il it y i s i nc re as ed i n
di f f i cu l t
well condi t ions This new system has improved
the eff ic iency and
safety
of wel l
t e s t ing
in
th i s
area
INTROpUCTION
Convent ional DST s t r ings requi re mechanical
p ipe
manipUlations
and/or
increasing levels
of
annulus
or p ipe pressure
to
ac tua te
sequentia lly
the
too l s in the DST s t r ing during
the dif feren t
t e s t phases These opera t ions can
become
d i f f i c u l t t ime consuming or l imi ted under
cer tain
condi t ions
for the following reasons:
Th e
con t ro l
of DST t oo l s through
pipe
manipula t ion i s d if f i c ul t to monitor
in
deviated
wells
because
of pipe
drag inside
IReferences an d
i l lus t r a t ions
a t
en d o f p ap er
* Mark
of
schlumberger
6
the casing an d on offshore f loa t e r s because
of r ig movement
with
th e
heave; t h i s
d i f f i cu l t y
in
con t ro l l i ng the
s t r ing
may
j eopardize the
operat ion
with
unwanted
s i tua t ions such as
an
u n se at ed p a ck e r
Pipe
manipula t ions
are dangerous when
operat ing with di f f e r en t ia l pressure between
the
pipe
an d the
annulus;
t h i s
i s
the
case
during
underbalanced per fora t ing
- Conventional
DST
too ls operated by
pressure
ca n only be a ct ua te d in the sequence planned
during
the
design
of
the
t e s t
no
devia t ion
from t h i s prese t sequence i s allowed once
the
to ol s t r in g i s
in
th e
hole
Excessive
pressure may
j eo pa rd iz e w el l
safety with
for example a
burst
casing or a collapsed
too l ; th e
number
of i nc re as in g s eq u en ti al
pressure levels to be applied to the
annulus
to
operate the d i f fe ren t too l s in the s t r ing
i s therefore
l imi ted
Th e problem i s
worse
when
perforat ing
a devia ted wel l s ince a
p r e s su r e
ac tua t ed t ub i ng conveyed
per fora t ing
TCP
f i r ing
system
i s
normally
pre fe r r ed to
a drop bar system In a
workover
s i tua t ion where
an
inplace casing
must
be
protec ted because o f q ue st io na bl e
in tegr i ty
the
maximum pressure tha t
can be
appl ied
to the
annulus
can be
quickly
reached
- Fina l ly severe
sand
production
during
the
flow period of a t e s t af f ec t s th e co rre ct
mechanical
opera t ion of conventional
DST
too ls
7/24/2019 SPE 00022720 Pressure Pulse Controlled DST System Iris Valve
2/8
2
TESTING GREEN
NYON WELLS WITH
A
PRESSURE PULSE
ONTROLLED
DST
SYSTEM
SPE 227
A DST s t r ing , con t ro l l ed by low pressure
pu l ses in
the
annulus ,
e l im ina tes
these
convent iona l s t r ing l im i ta t ions
in d i f f i cu l t
condi t ions . This new t e s t ing technique, the
I n t e l l i g en t Remote Implementa t ion System
IRIS* , provides f l ex ib l e and
s impl i f i ed
control
of
the d if fe r en t t oo ls
in
the
s t r ing and
re l i ab le and safe opera t ion
to opt imize
t e s t
data
acquis i t ion .
THE PRESSURE PULSE ONTROL SYSTEM
Control commands,
or
s ignature commands , are
sen t
th rough th e annulus in
th e form of
p redef ined
seq uen tia l p res sure p ulse s .
A
s igna ture command i s
def ined no t on ly
by i t s
pressure
l eve l s but
also
by th e
t iming
of th e
di f feren t pulses; a t yp i ca l command i s
shown
in
Figure 1 . Each t oo l of th e
DST
s t r ing i s
assigned
a given
s igna ture
command.
A ba t t e r y powered downhole i n t e l l i g en t
elect ron ic con t ro l l e r analyzes the output
data
of a
pressure
t ransducer to recognize
commands,
confirm
t he i r val idi ty
and t ransfer the
order to
the
hydraul ic
and mechanical ac tua tor section
of
th e
t oo l
to
be
operated . The
downhole
mechanical energy
used
to
physically
ac tua te the
t oo l s i s genera t ed
by th e
t r a n s f e r
of
hydrostatic pressure to
an
atmospheric chamber.
EOUIPMENT
DESCRIPTION
Today s
p re ss ur e p ul se ac t iva ted
too l consis ts
of a combined
flow con t ro l
va lve and a
multicycle ci rcu la t ing
v alv e, b oth
independently
operated. The appl ica t ion
of
t h i s too l i s cased
hole
DST
s ince th e valves are
annulus
opera ted .
This fu l lbore t oo l ha s a 5- in . outside diameter
and
2 1/4- in .
ins ide diameter;
i t s
lS - f t length,
i s
cons iderab ly shor te r than
th e
leng th of
t yp i c a l
equ iva len t convent ional
t o o l s .
A
s impl i f i ed
diagram
o f
t h i s equipment i s
presented in F ig ure 2 .
The IRIS system i s combinable with
any
ex is t ing complementary DST too l (Figure 3 . I t
i s
designed
to operate
without spec ia l i zed
surface equipment; conventional mud pumps and
bleed-off l ines have
been
used successfully to
send commands down th e annulus . A
l ap top
commerc ia l computer i s used a t the r ig f loor to
i n i t i a l i z e th e
e le ct ro n ic c o nt ro ll er
before
running in the hole and to re t r ieve a downhole
his to ry f i l e a f t e r the job to use for qual i ty
contro l .
EOUIPMENT
OPER TION
To ensure t o t a l opera t ing f l ex ib i l i t y , the
system
accepts
an d imp leme nt s
th ree types of
commands
to
independently
contro l
in
any order
th e flow control
valve
and the ci rcu la t ing valve
The command types used by the valves of
on
s t r ing are se lec ted during
job
des ign . Th
available commands are:
p i rec t command: The cont ro l ler recognizes
single
pressure
s ignal
s igna ture
and
alway
implements regard less o f previou s event
or
s ta te of
th e
too l .
This mode i s used t
opera te
ei ther valve in the s t r ing .
Sequent
a
J commands: Th e con t ro l l e
recognizes
not only commands but also t he i
sequence .
Typical ly , a
se t
of
command
enables
/ d is ab le s t he mode,
an d another
se
of commands c on tr ol s th e too l once
enabled
This set i s used
to ensure a short , re l iab l
flow control
valve operat ion.
These two
commands
assume tha t the
annulus i
f i l led
with
an incompressible
f luid:
N it rogen command: This spec i a l comman
sequence
c loses
the
c i rcu la t ing
valve whe
nitrogen
i s present
in
the tubing /
pipe. I
overcomes th e command p re s su re
pu l s
t ransmission
s t ab i l i t y
problem
crea ted
by
th
compress ib i l i ty of th e gas . The ni t roge
close
command
i s
ac t iva ted only
a f t e r
ni t rogen
open
command i s executed .
Th
nitrogen open command i s s imila r to a di rec
command
bu t
with di f feren t
t iming
pat tern .
Figure 4
shows
a sketch of these
th re
commands which
are
available any t im e d ur in g
job. The downhole
sof tware iden t i f i e s the typ
of
command received
thanks to
the pressur
l evels and
t iming
pat terns
of
the pulses . Th
pressure levels
and
t iming pat terns of
th
d i f f e r en t
commands
are def ined
in
th e too
software
and cannot
be
modif ied
by th e DS
operator
a t
th e
wel l s i t e .
A
fourth
command
typ
exis ts :
Surface prese t command: This command i
executed
au tomat ical ly
when predetermine
downhole c on di ti on s a re
met. F or example , th
c irC U la tin g v alv e
wi l l c lose when th
required hydros ta t ic underbalance i s reache
wh il e running
in the hole .
This
array of
commands allows the operat ion
o
any pulse contro l led t oo l tha t
may be
require
during
a DST even i f unplanned a t
the
time o
the t e s t design.
OPER TION L EFFICIENCY
The
too l
i s
functionally
t e s t ed and programme
with th e proper
job
setup a t the r ig s i t e in
s ho rt p er io d
of
time r ight
before
running
in th
hole .
There i s
no
need
for
th e
high
pressur
nitrogen charging or
mechanical
cyc li ng r equ ir e
with convent ional too l s . Fie ld redress and
rese
Mark
of
Schlumberger.
6
7/24/2019 SPE 00022720 Pressure Pulse Controlled DST System Iris Valve
3/8
SPE
22720
J . HEALY
J .
MARATIER
M FRUGE
3
ca n
also be done
promptly
case a second
ru n
the
hole
immediately required.
This
new t e s t
system ha s
improved
r e l i a b i l i t y
compared t o
conventional DST
t o o l s
wells
f lowing
d e b r i s sand,
gun debris or mud
s o l i d s .
I t mud-immuned by design; c r i t i c a l moving
p a r t s
a re p ro t ec te d from wellbore f l u i d s .
F i n a l l y
dur ing
th e
w ~ l l t e s t operat ion,
th e
t oo l c o nt ro ll er recordJ annulus pressure
d a t a
v er su s tim e a i s r e ~ e e l e c t r o n i c
memory;
it
a l s o c r e a t e s
an d
redords a
command
s t a t u s
h i s t o r y
f i l e i n d i c a t i n g commands r ec e iv ed ve rs u s
commands executed. Back a t s urf ac e, th es e
f i l e s
are downloaded on a p o r t a b l e
computer and used
as
a
post jo b evaluat ion check Figure 7 .
In
some
cases p r e s s u r e l e v e l s
r e q u i r e d
by
convent ional DST
t o o l s cannot be allowed the
annulus. The
weak
point can be the casing, th e
l i n e r a t th e packer l e v e l t h e
top
of the l i n e r
or
a
t o o l
the
DST
s t r i n g
Figure
6 .
In such
c a s e s where t h e
d i f f e r e n c e between
t h e
h y d r o s t a t i c
p r e s s u r e
and th e maximum al lowed
pressure
small , a
p re ss ur e p ul se
c o n t r o l l e d
s t r i n g required.
o b j e c t i v e s
following:
e f f e c t s
o f
In case of emergency, both
c i r c u l a t i n g
and
flow c o n t r o l valves can
be s h i f t e d
in
a
p r e s e l e c t e d f a i l s a f e p o s i t i o n by applying
a
s e l e c t e d pressure
t o th e
annulus.
o p e r a t i o n s .
Low
p re ss ur e p uls es minimum
250
psi
t o
c o n t r o l
the t o o l s
a r e
always
within
the
maximum al lowable
pressure
t h a t may
be
applied
t o a c a s i n g . This p a r t i c u l a r l y important
whenever
t h e s e
o pe r a t io ns a re contemplated
dur ing
a workover
or
recompletion where
casing
i n t e g r i t y
must
be
pro tec ted .
These
pUlse c o nt ro ll ed t o o ls can be
operated
a t
any depth,
going
in or coming out
of the
hole.
This
f e a t u r e
allows
b e t t e r
well
control
while t r i p p i n g
in or
out case the
mud
weight
has
t o
be adjusted
t o control
a
zone l e f t with
open
p e r f o r a t i o n s .
A d d i t i o n a l
s af e ty f e at u re s t o preven t
an
unsafe s i t u a t i o n a r e :
In a
s i m i l a r
fash ion th e
l o g i c
o f
t h e
downhole
c o n t r o l l e r
prevents
the c i r c u l a t i n g
valve from opening i f
th e
flow
control
valve
i s enabled
e i t h e r
open or closed.
The
flow
c o n t r o l
valve can be preprogrammed
t o c lo s e a u to m at ic a l ly in t h e event
t h e
annulus
i s overpressured.
Also, th e
t o o l
designed
t o
close in th e
event
th e annulus
pressure
i s
bled or l o s t .
In
b oth c as es
th e
flow
c o n t r o l valve
can be reopened
once
th e
problem i s
solved.
FIELD
EXPERIENCE
Both
the
operat ional
an d s a f e t y
features
of
t h i s
p r e s s u r e p u l s e
c o n t r o l l e d
system
a l l o w
p e r f o r a t i n g and
t e s t i n g
in
wells
with condi t ions
to o
r e s t r i c t i v e fo r conventional
DST
equipment.
The
l o g i c o f t h e downhole
c o n t r o l l e r
prevents
th e
flow control
valve from
opening
i f the c i r c u l a t i n g
valve
i s open.
Mobil
p e r f o r a t i n g
and t e s t
normally include one or more of
t h e
Clean-up
and
s t i m u l a t i o n
underbalanced p e r f o r a t i n g .
niti l
r e s e r v o i r p r e s s u r e
p e r m e a b i l i t y - t h i c k n e s s p r o d u c t i v i t y
index
and
sk in .
H y d r o s t a t i c
p r e s s u r e of
t h e complet ion
f l u i d .
Occasionally
an
extended
DST 12-hr
i s
required
t o
t e s t
f o r d ep le ti o n or t o measure drainage
r a d i u s sand product ion p o t e n t i a l
an d
g a t h e r
well
productivity
parameters. The above da ta are
used f o r adjusting
t h e
completion f l u i d weight,
determining reserves
t o j u s t i f y development or
complet ion
c o s t s an d e va lu at in g g ra ve l pack
e f f i c i e n c y .
o ol s pe ci f i c at i o n s
p e r f o r a t i n g an d DST
B u i l t - i n
o p e r a t i o n a l
improve th e s a f e t y
of
S FETY FE TURES
n automatic underbalance closure
feature
also
s im p li fi es t he
operat ion; it al lows e i t h e r
th e
t e s t valve
or
the c i r c u l a t i n g
valve
t o
be run
th e
hole
th e
open
p o s i t i o n
and
t o
be closed
when t h e
r e q u i r e d
underbalance
h y d r o s t a t i c
p r e s s u r e r e a c h e d . T h i s
o p e r a t i o n
automatical ly takes place whi le r un ni ng th e
hole without
any r i g floor
i n t e r v e n t i o n .
This
an
important feature devi a ted we l ls .
I f required, f u l l redurydancy
can be
provided
with
a
second
pressure poIse
c o n t r o l l e d
system
operated with d i f f e r e n t
s i g n a t u r e commands
or
with conventional DST t o q l s .
Pressure
control
p uls es a re t y p i c a l l y of a
few
hundred p s i
magnitude
an d s e v e r a l minutes
long. Tolerances on
th e p re ss u re l e v e l s an d
t i m i n g of t h e s e commands a r e
a d j u s t e d
t o
accommodate
u s u a l
r i g
pump output an d
t o
e l i m i n a t e
p a r a s i t i c nonvalid
commands.
The
c o n t r o l and o p e r a t i o n of
t h e
d i f f e r e n t DST
s t r i n g
t o o l s
a r e
t h er e fo r e s im p li fi ed
compared
t o annulus pressures
excess of
1000 p s i or
d r i l l f l o o r
p i p e manipula t ions
r e q u i r e d by
convent iona l DST s t r i n g s . P r e s s u r e p r o f i l e s
.
r e q u i r e d
f o r a t y p i c a l job
by b o t h
a
conventional and a p r e s s u r e
pUlse
c o n t r o l l e d
s t r i n g are
i l l u s t r a t e d
on
F ig ure 5 . As
seen on
t h i s
f i g u r e
p r e s s u r e pUlse c o n t r o l l e d
s t r i n g s
require considerably lower
pressure
l e v e l s for
operat ion.
6
7/24/2019 SPE 00022720 Pressure Pulse Controlled DST System Iris Valve
4/8
4
TESTING
GREEN
CANYON
WELLS
WITH A
PRESSURE PULSE
CONTROLLED
DST SYSTEM
SPE
227
Both
th e convent iona l an d new DST
t o o l
s t r ings have
been
success fu l ly used
in
placing
seawater underbalances
ranging from 300
to 1000
ps i .
At
Green Canyon, sand product ion i s
f requent
dur ing the
pe r f o r a t i ng
and DST
operation. To date,
no
g uns hav e rema in ed
stuck
in the hole. However, convent ional DST
too ls
are
s us ce ptib le t o
debr is
and sanding
problems;
consequen t ly they may f a i l
to
opera te as
desired. The new
DST
to ols o ffe r the advantage
of
sand immunity,
as
demonstrated
in
case
history i l .
The second
case
h i s to ry presen ted in
t h i s
paper i s
a t yp ica l IMPULSE t e s t ,
as ru n in
the
Green Canyon area . P re ss ur e pu ls e con tro l led
DST
t oo l s , a
flow
cont ro l
valve
an d a c i rcu la t ing
valve p er fo rm ed a s spec i f i ed .
Maximum
1000-psi
pressure
was
applied to the annulus to
operate
these
too ls .
So far , nine
per fo ra ti ng /DST j ob s
have been
completed
in t h i s area with p re ss ure p ulse
con tro l led too ls .
Case
Hj s t
y
During recent completion
of
a development
wel l , a DST
was
requi red
to
t e s t th e
c ommerc ia lity o f
a
sand. The
s i l t y
sand
contained
a
water contac t , an d
i t s
ae r i a l
exten t was
unknown.
A
shor t
flow per iod
IMPULSE t e s t followed by an extended 2 4
hour
f low /b uild -u p p er io d was proposed.
Actua l
wel l
r e s u l t s found th e sand
uncommercial.
Following
the IMPULSE t e s t , the
sand
watered
out during
the
extended
flow
pe r iod .
By
t h i s
method,
unneces sa ry
completion costs
were
avoided
and
a dif feren t
in te rva l up-hole
was completed.
The DST jo b fea tured
a
pressure
pulse
con t r o l l ed
c i r cu l a t i ng
valve
ru n
in
a
conventional
DST s t r i ng . This c i r cu la t ing
valve was ru n
in the
hole
in
the open
pos i t ion . The
valve
was closed with a d i rec t
command af te r d is pl ac in g t he tubing with sea
water .
The wel l was produced
for seve ra l
hours
with
25 to
45
sand product ion.
At
the
en d
of
th e
shut - in ,
the
valve was re-opened
with
a
second
d i rect command to
reverse out
t he tu bin g.
Two addi t ional commands
were sent
subsequently:
on e
to
rec lose the
valve
to
bul lhead th rough th e
convent iona l f low
con t ro l
valve an d a
second to reopen the
c i r cu l a t i ng
valve to p u l l o u t
a f t e r
the
conventional
flow
cont ro l valve was plugged
by
sand.
Four
commands
were
sen t
and
executed;
the
range
of
t he p re ss ur e
p uls es s en t
was 490 to
540 ps i . The
pressure
pulse
cont ro l l ed t oo l
was
operated in sp i t e
of
important
sand
product ion.
The pressure pulse prof i le of t h i s DST
is
presented in F ig ure 8 .
Case History
2
The
completion of
t h i s development
we
included
a per fora t ing / IMPULSE t e s t . T
job,
in a
41-degree
d ev ia te d w ell,
w
completed
with
a pressure
pulse
cont ro l l e
flow con tro l
valve and
a c i rcula t ing valve
primary
t e s t too ls . The
wel l
was perforate
during the
same
t r ip using
tubing-conveye
guns.
During
t h i s
job,
the
ci rcu lat ing
valve
w
opera ted in di rec t
mode whi le
the flo
con t ro l
valve was
operated in
sequent i
mode.
Eleven commands
were sen t
to
the
flo
con t ro l valve ,
an d
tw o commands to th
ci rcu lat ing
valve; a l l
commands,
staying we
below the sa fe wel l maximum a l lowab
pressure,
were
accepted.
The pressure
pulse
prof i le
of
t h i s jo b
shown in
Figure
9.
CONCLUSION
The
pressure
pulse
control led
DST system
ha
improved the
ef f ic iency and
the
safe ty of we
t e s t ing
operat ions
in the Green
Canyon
area
Downhole t oo l i s simplif ied and
more
f lex ib le
Qual i ty cont ro l of the t e s t va l i d i t y i
ava i lab le , and bu i l t - i n equipment f ea tu re
ensure
a safer
well t e s t
environment. Associate
with the IMPULSE well t e s t ing
method,
the
IR
system i s pa r t i cu l a r l y usefu l
in
wells wi
r es t r ic t ive condit ions
such as
deviated wellbo
prof i le ,
casing pressure
l imi ta t ion
or
potent i
sand
product ion.
ACKNOWLEDGMENTS
The authors
thank Mobil
and
Schlumberger fo
permission to publish t h i s paper.
SI METRIC
CONyERS
ION
FACTORS
f t
x 3.048
E-01
m
x 2.54
E+01
m
ps i
x
6.894
757 E=OO
kPa
7/24/2019 SPE 00022720 Pressure Pulse Controlled DST System Iris Valve
5/8
Pressure
Pressure Pulse
Controlled
String
Conventional
String
Fig 3 New string versus conventional string
Reversing
Valve
Circulating
D
Reversing
Valve
Valve
Flowcontrol
Valve
g
f81
Combined FlowControl
Reference
and Circulating Valves
Tool
Recorder
Recorder
Carrier
carrier
Jars
Jars
SafetyJoint
r J I r J I
Safety Joint
Packer
Packer
Slotted Pipe
Slotted Pipe
Firing Head
Firing Head
Guns Guns
Bullnose Bullnose
I Minimum
t r s s u ~
ctuator
irculating
alve
low
ontrol
alve
ensor
Fig. 1 Signature command profile
Time
Electronic
Controller
Defined time pattern
Hydrostatic
Oil Chamber
r ssur
Atmospheric
Dump Chamber
yd ro s t a t i c
ressure
500psi
Fig. 2 The pressure pulse controlled CST system
7/24/2019 SPE 00022720 Pressure Pulse Controlled DST System Iris Valve
6/8
Pressure
Direct Command
Fig.
4
Pressure pulse commands
Reversing
Out
Conventional
String
I
I
I
Firing Running
Guns Test
I
I Pressure Pulse
I Controlled.Strin
g
Opening Flow
Control Valve
Fig. Required annulus pressure profiles
Annulus
Overpressure
Level psi)
500
1500
2500
1000
2000
Time
0
l
o
[5
Time
Time
sequenti l Command
N itrogen
Command
pen
Q
c
S
c
W
Pressure
JtJ t
Pressure
11
7/24/2019 SPE 00022720 Pressure Pulse Controlled DST System Iris Valve
7/8
Fig. 7- Downhole job history file
CMMD RCVD: 70-SM OPEN TV
TL TIME RCVD: 00019 HRS 00002 MIN
dP: 00505psl dt: 00000, 00000 sec
CMMD RCVD: 01-CLOSECV 1
TL TIME RCVD: 00009 HRS,00054 MIN
dP: 00466psl
dt:
00018,00024 sec
NAM 4
12-MAR-91
09 hr52 m
MAR14DV
MAR14DV
Test Number:
Tool Powerup Date:
Tool Powerup Hour:
Header Filename:
Data Filename:
OPERATION 00001
TOOLID: 2 VLV TOOL, TOOL
1
COMMAND EXECUTED
y
Vb: 00009.5v -Vb: - 000
OPERATION 00002
TOOLID: 2 VLV TOOL, TOOL
1
COMMAND EXECUTED
?
Vb: 00009.7v
Vb:
000
OPERATION 00003
TOOLlD: 2 VLV TOOL, TOOL
1
COMMAND EXECUTED Y
Vb: oo009.7v -Vb: - 000
OPERATION 00004
TOOLID: 2 VLV TOOL, TOOL
1
COMMAND EXECUTED Y
Vb: oo009.7v -Vb: - 000
OPERATION 00005
TOOLID: 2 VLV TOOL, TOOL
1
COMMANDEXECUTED ?
Vb: 00009.7v -Vb: - 000
329001
ALPHA OIL
PC 72
CMMD RCVD: A3-ENABLETL 1 SM
TL TIME RCVD: 00018 HRS, 00059 MIN
dP: 01039psl dt: 00102,00000 sec
CMMD RCVD: 7A-SMCLOSE TV
TL TIME RCVD: 00019 HRS, 00013 MIN
dP:
ooOOOpsl
dt: 00000,00000 sec
CMMD RCVD: 75-LO PR DISABLE SM
TL TIME RCVD: 00020 HRS,00008MIN
dP:
OOooOpsl dt:
00000, 00000 sec
Client:
Well Name:
Well Location:
service Order :
PipelTool
ollapse
Liner Top
Failure
asing urst
asing
ollapse
-
Fig.
6-
Pressures in a
DST
design
Reservoir
Pressure
Pump , .-oJ
Pressure
7/24/2019 SPE 00022720 Pressure Pulse Controlled DST System Iris Valve
8/8
I
Enable Flow Control Valve
Open Flow Control Valve
Close Flow Control Valve
[
Displacing
Tubing
Reversing Valve
losed
=
3
CD
Disable Flow Control Valve
Reversing Valve Open
Reversing Valve Close
Enable Flow Control Valve
Open Flow Control Valve
Close Flow Control Valve
Open Flow Control Valve
Close Flow Control Valve
Open Flow Control Valve
Disable Flow Control Valve
I dS
T
c Q
I
0
l
(I )
CD
T