modul iv pressure drawdown.pptx

8/9/2019 Modul IV Pressure Drawdown.pptx

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Pressure Drawdown

Muhammad Taufq Fathaddin


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Pressure Drawdown Test

Pressure drawdown tests are perormed ater thewell has been shut in or a period sucient toestablish static pressure conditions. The well isopened and produced at a steady ow while the

pressure (and optionally the rate chan!e isobser"ed at the sandace.


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Tu#uan $#i PDD

Men!u%ur permeabilitas& %& rata'ratabatuan reser"oir di dalam daerahpen!urasan sumur. Dari data

transmisibilitas T %h)& pay *one& h&dan "is%ositas .

Menentu%an "olume pori& +p. Dari data

+p,tdan %ompressibilitas total ,t.Mendete%si %etida%homo!enan

reser"oir dalam daerah pen!urasan.


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$#i PDD

$#i PDD dila%u%an den!an caramenutup sumur hin!!a tercapai%estabilan te%anan Pi (initial pressure

di seluruh daerah pen!urasannya.Menurun%an pere%am te%anan %e

%edalaman sedi%it di atas perorasi.

Membu%a sumur untu% mewmprodu%siuida pada la#u yan! tetap.

Pere%am mencatat te%anan awal Pi&

dan te%anan alir dasar sumur& Pw.


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-%ema %ondisiinfnite actin!dan semi steadystate


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Pen!u%uran PDD

o /.01 2)-T

o 3.4 cp

h 53 t

6/33 b)dPi7333 psi

t&hr pw&psi t&hr pw&psi

3.3/ 0875.98 /3 0483.//

3.3/: 0808.5/ /: 044:.10

3.351 0801.4 51 0440./5

3.37 0805.55 73 0498.1

3.3:1 0854.1/ :1 0490.70

3./ 0851.50 43 04:8.94

3./: 085/.:1 /33 04:7.80

3.51 08/4.57 /:3 0413.01

3.4 0838.04 513 0454.78

/ 0839.79 733 0985.3:

/.: 0837.38 :13 090/.00

5.1 0833.:4 433 0:87.8

:.1 0480.08 /333 0:7:.05


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;nalisa Periode Transien

Dimana:

m = 162.6 q Bo/ kh (2)


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;nalisa Periode -emi -teady-tate

-emi steady state) pseudo steady state) quasisteady state

Dimana:

t'ss

o'

,m

%.%"1!qB0 =

hr

&.61&0

2e

'

=

m'ss= (P2- P1)/(t2 t1)

root ,,,, ++=

(2)P

r

r%."!2log2mt

,0

%.%"1!qBPPP skin

/

e

t'

o/i +

+==


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=e% -%in DPskin 3 % (Damage)

DPskin 4 % (timulation) DPskin = % 5o Damage or timulation

ek skin 7i7einisikan se*agai:

+= 2$.$

r,-

ktlogmPP1.1&1s

2/t

/i

8ntuk P= P19am

($)2$.$r,-

klogmPP1.1&1s

2/t

19ami

+=

(")sm%.:!shk

-Bq1"1.2P oskin ==


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Pen!aruh -%in Terhadap Tampan!Te%anan


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;nalisa >ur"a PDD


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Pada Periode Pen!in#e%sian (#am

Pada Periode Fallo? (#am

@a%tu untu% ;liran 2adial


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Pada Periode Pen!in#e%sian (#am

Pada Periode Fallo? (#am

>oefsien @ellbore -tora!e& ,

Didasar%an pada sumuryan! terisi penuh oleh

uida. Te%ananpermu%aandipertahan%an selamapen!u#ian.

Permu%aan uida turunsehin!!a sumurdiba!ian atas men#adi"a%um


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@a%tu untu% mencapai batas dapatdihitun! dari persamaan #ari'#aripen!amatanA

r #ara% dari sumur %e batas pen!urasan

t wa%tu untu% mencapai bataspen!urasan

@a%tu untu% Pseudo -teady -tate


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,ontoh -oal Dt (minutes Pressure (psi/3./597 /478.77

73.0:/9 /903.91

43.1177 /::/.98/3/.397 /:71.55

/55.97: /:55.05

/75.947 /:38./7

/18.311 /18:.3:

078.1:/ /744.70

14:.59: /087.59

9:9.347 /05:.00

83/.3:1 /597.:4

/3:8.94 /5/:.:

/758.5 ///8.94

/948.77 /35:.00

5/55.75 800.337

5783.30 40:.130

5984 97:.1/10575.:: 184.940

The pressure data were obtained roma 13'hour drawdown test in a well in a

Den"er asin reser"oir. Data pertinentto the test are as ollowsA6 433 -T)D& /.3 cp& 3./&h 4 t&

rw 3.00 t&Pi /481 psi!&,t /9.9 B /3':psi'/&o /.51&-w 3.01

P T t


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Penye esa an Trans ent;nalysis

P T t


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Penye esa an Trans ent;nalysis

P l i (C t T i t


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Penyelesaian (Cate Transient;nalysis

P l i (C t T i t


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Penyelesaian (Cate Transient;nalysis

t'ss

o'

,m%.%"1!qB0 =

(-6))1%;1&.:(1!.!

modul iv pressure drawdown.pptx

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