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UNIVERSTTITEKNOLOGIP ETRONAS
GOURSE : PAB2O94 WELL COMPLETIONS AND PRODUCTION
DATE : 18 NOVEMBER 2009 (WEDNESDAY)
TIME = 2.30 PM - 5.30 PM (3 HOURS)
INSTRUGTIONS TO GANDIDATES
1. Answer ALL questions from the Question Booklet.
2. Begin EACH answer on a new page in the Answer Booklet.
3. lndicate clearly answers that are cancelled, if any'
4. Where applicable, show clearly steps taken in arriving at the solutions and
indicate ALL assumptions.
5. Do not open this Question Booklet until instructed.
Note : i. There are NINETEEN (19) pages in this Question Booklet
including the cover page and Appendices.
ii. Graph and Semi Log papers are provided.
iii. Engineering Formula Booklet are given.
Unlversiti TeknologiPETRONAS
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a..
PAB 2094
A reservoir is producing at stable conditions with following data:
average reservoir pressure' P'= 1800 psi
bottom hole flowing pressure'P*f= 1000 psi
bubble Point Pressure' P6 = 2000 Psi
oil flow rale, qo=210 bbl/daY
By using Vogel's equation,
calculate the maximum oil production' \
{".r .. [2 marks]
\*\plottheinflowperformancerelationshipassumingbottomhole
flowingpressuresofl350psi,g00psi,450psi,and0psi(graphg
paper is provided)'[6 marks]
(vDetermine the specific productivity index for a well producing ttpj{'""
bbl/daywithaflowingbottomholepressureof2350psi.Thereservotrl'
thickness is 40 ft and average reseryoir pressure is 3390 psi.\'...4.
[4 marks] \t"'
,1'-il.
b.
c. lf a second well in the same oil
reservoir at a location where the
the flowing bottom hole Pressure
(b).
field as in Part (b) j=tftes the
reservoir thickness i. 99ii calculate
at the same rate as the well in Part".\.,*
[4 marks]
2
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2.
PAB 2094
An oil well has been drilled by Myanmar oil and Gas Enterprise. when it was
found that therewere three_P19duqtive zones in this well, it is required to
accomplish bottom-hole completions to produce well fluid from this well. well
completions should include apprgry|a! :91pl_"li:: ::1incomponelts' rhe
information on these three productive zones is listed"lii-.fhe tottowing table.
TABLE Q2
Productive
Zone
Depth Bottom-hole
Pressure
TYPe
of Fluid andconstituents
Specific
Gravity ofFAd
Tone I 10000 ft 3550 psi oil aJjT
Zone 2 10050 ft 3600 psi Oil, with sand
particles \
0.78
Ir*'\ /
Zone 3 10150 ft 3700 psi oil \ \?Ii
t. To produce oil from zone 1 and
segregated whilst zone 2 shut-in.
zone 3 commingled or
[3 marks]
: '/ii. To produce oil from .9n*g"gregated with no sand p-articles 0
whilst zone l and zone 3 shut-in.
[3 marks]
iii. To produce oil from zone 1 and zone 2 segregated, and
simultaneously whilst zone 3 shut-in
[3 marks]
Draw
fnecpmpletion configuration for each of the following cases.
,t\r
I,t:
\r
{1.'
i1L
. btr'
J:'''r
a.
.
,J\'
It\-
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tv.
PAB 2094
To produce oil from zone 1, zone 2 and zone 3 segregated' and
simultaneouslY.
[3 marksJ
List THREE (3) completion string components consisted in your
suggestedwellcompletiontype,andgiveanexplanationfor-eacft
component.
,'
Svd11* ,-fr
.\d{
rfl.
/-lI"Y(iis'z-Jr
,\\u o r"{f; r!, r-'' \\'' ,r'
1f"'- rr-{rr
l-
4
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PAB 2094
operating principle of ESP system with the aid of a neat
[4 marks]
ListFoUR(4)componentsofanEsPsystemandexplainthefunctions
of these comPonents'
[4 marks]
Make a proper drawirlg of surface equipment layout for gravel pT[]g
o p e ratio n a n d ex p I a i n s-u rra ce iiEia-ti*o n-p
roce.gure f o r g rave I
?":::;r,
Discuss the suitability of ESP and GL artificial lift systems for both
onshore and offshore application'
[4marks]
tthe
,1"t"
\:
,\,
d.
t,
r'\\'
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PAB 2094
ln Field X, three wells were completed in similar formations at depths
ranging from 5,000 ft to 10,000 ft. The individuat well information is
given in TABLE Qaa(i).
The
well
ideal producing rate, q of an undamaged
in a steady state flow can be estimated
Using your answer in part (ii), indicate
from an acid treatment and estimate
increase after the treatment'
(skin S = 0) oil Producing
from the reservoir data
[4 marks]
[4 marks]
which well would benefit
the potential Production
tabulated in TABLE Qaa(ii)'
TABLE Qaa(ii)
OilviscositY
ffi@
6cp
1.2
800 ft
Wellbore radius 0.25 ft
Calculatetheidealwellproducingratesforallwells'
ii. Compute the skin factor for each well'
6
TABLE Q4a(i)
Flowrate (bbl/d)
Reservoir thickness (ft)
Drawdown (Psia)
0il PermeabilitY (mD)
iii.
12 marks)
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b.
PAB 2094
A well was completed over a 500 mD formation with a well spacing of
40 acres (r, = 745 ft). The wellborediameter is 7
ftinch. lf it is decided
to case the hole, the pay zone will be perforated with a through ,Y!]nn
gun where the perforation charges have a depth of penetration of
1 4 inch rh" dtrhg'S-"9{r.9g$'m?1iy fllf i".:trnJ o"pttl 9f dfllle"d-Jgsi"11lgry the wellbore' rABLE Q4b
tabulate the available mud tYPe.\il-
TABLE Q4b
Mud A B C D
Permeability in damaged zone (mD) 100 20 300 200
Depth of invasion (ft) 16 0.8 2.0 2.3
From a well productivity point of view, which mud system would you
recommend for the following completions? Justify your answer'
Open hole.[5 marks]
ii. Cased hole.
[5 marks]
7
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a..
PAB 2094
Data for a completed well in Field Y are tabulated in TABLE QSa'
TABLE QSA
Tubing length 8500 ft
Flowrate 4000 barrel liquid Per daY
Tubing diameter 4 inch
Well head Pressure 120 psi
Average reservoir Pressure 2500 psi
ProductivitY lndex 4.0 (linear)
Gas Oil Ratio 400 scf/bbl
Water cut 50%
b lr!
\\q
i.
y(. --\i !.,"
l ,,1
,:l:
t"t
t.-l
. /ri\ '\-'
' [3 marks]
ui,l
/"
// * ,'j'
v'
Determine the following:
i. The gas liquid ratio to flow the well'
,lt' '^, I Vi,'t''
TABLE Qsb
Depth of tubing 7000 fr
Average reservoir Pressure 2700 psi
Pl (linear) 3.5 b/d/psi
Wellhead pressure 1 20 psi
Gas Liquid Ratio 300 scf/bbl
Tubing diameter 4 inch
, )r
\\t\
ii. Amount of injection gas per day required if gas is injected at the
bottop of the tubing.
i; t [6 marks]
b. A well and reservoir have the following completion and reservoir data,
tabulated in TABLE QSb. The flow is 100% oil',).1
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Using the Gilbert Chart attached in the APPENDIX l,
the inflow performance relationship curve andintake
curve. Use the graph paper provided.\\:
PAB 2094
construct
pressure
[5 marks]
ii. From answer in part (bxi), determine the operating point.
[2 marks]
iii. Discuss the effect of tubing size and water cut towards the
operating rate.
[4 marks]
(Note: Show all your workings in Gilbert Charts in APPENDIX I and submit all
the working together with the answer script).
o
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PAB 2094
6000
5600
5200
g 4800oO
Ec 44@o4o)Ei 4000
:sE
$*mo
3200
2800
., t'.\O.Vt Gas lift performance curve for Well 1, Well 2 and Well 3 are shown in FIGURE
\l-\ 6a, 6b and 6c respectively.
34 345rale (MM sc'l/d)Gas iniectlon rate {M[,] sct/d]
FIGURE 6b
Gas Llft Perbrmance - Well 3
G* iniesden r{b ruM ec{/d}
FIGURE 6c
10
3200
2800
24W
P ?ooo
5osc 1600oujtod 1?m
3'F
$u*(5
400
I
FIGURE 6A
Ot00
2EOO
2&O
I 20005{!Es 1600
IgE6E troo
E'3F
B aoo
u
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0
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