SPE 00022720 Pressure Pulse Controlled DST System Iris Valve

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


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


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


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


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


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


7/8

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


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


1

COMMAND EXECUTED Y

Vb: oo009.7v -Vb: - 000

OPERATION 00005


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


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






Disable Flow Control Valve

I dS

T

c Q

I

0

l

(I )

CD

T

Documents

SPE 00022720 Pressure Pulse Controlled DST System Iris Valve