analysis of wor performance
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Pe523AnalysisofWORPerformance
Dr. Saber Elmabrouk
Steady-State WOR Model
)/ln(. we rrp
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Linear log(krw/kro) versus Sw rorww kk
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Conventional WOR Analysis
ow
ww qq
qf ow
qqWOR
Np fw
Conventional WOR Analysis log(fw) versus Np
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fw = 1
Conventional WOR Analysis log(fw) versus Np
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bpss m
Pseudosteady-State WOR Model
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Blasingame and Lee
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qqWOR
Pseudosteady-State WOR Model
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Pseudosteady-State WOR Model
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WOR
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Nt
w
pw q
Wt
Pseudosteady-State WOR Model
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WOR
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Pseudosteady-State WOR Model log(fw) versus Np
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fw tw to
Pseudosteady-State WOR Model log(fw) versus Np
Pseudosteady-State WOR Model Results from the PSS WOR model versus the field production data
10-2
10-1
100
101
Cal
cula
ted
Wat
er-O
il R
atio
(pss
mod
el)
10-2 10-1 100 101
Measured Water-Oil Ratio (WOR = qw/qo)
Unit Slope Line
Pseudosteady-State WOR Model Results from the PSS WOR model versus the field production data
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Estimation of Movable Oil Conventional techniques
log(qo) versus production time, t qo versus cumulative oil production, Np fo versus cumulative oil production, Np log(fw) versus cumulative oil production, Np Ershagi's X-function 1/fw versus cumulative oil production, Np 1/qo versus oil material balance time, to
Analysis of WOR Data
Qualitative Analysis log(fwc) versus cumulative oil production, Np log(WORc) versus cumulative oil production,
Np log(WOR) versus total production, (Np+Wp) log(fo) versus total material balance time, tt WOR and WOR associated functions versus
time, t (to)
Analysis of WOR Data
Analysis of WOR Data log(qo) and log(qw) versus t
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qo=0
Analysis of WOR Data qo versus Np
fo=0
Analysis of WOR Data fo versus Np
fw = 1
Analysis of WOR Data log(fw ) versus Np
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1/fw=1
Analysis of WOR Data 1/fw versus Np
1/qo
Np /qo
Analysis of WOR Data 1/qo versus Np/qo
)/(/ opo qNbaq 1po bNaq 1
0oq bNp /1
Reciprocal of qo versus oil material balance time
Analysis of WOR Data
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bNp1
b
Analysis of WOR Data 1/qo versus Np/qo
Np,mov = 164,500 STB
0.20
0.15
0.10
0.05
0.00
Rec
ipro
cal o
f Oil
Rat
e, 1
/qo,
1/S
TB/D
ay
8,0006,0004,0002,0000
Oil Material Balance Time (Np/qo), days
1/qo = 1.5927x10-2 + 5.6306x10-6(Np/qo) 1/STB/D
Np, mov = 177,600 STB
Legend: NRU 104 1/qo Function 1/qo Linear (Np/qo) Model
Analysis of WOR Data 1/qo versus Np/qo
Np,mov = 164,500 STB
Analysis of WOR Data fwc versus Np
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Comparison of the estimated Np values
Analysis of WOR Data
Method Np value,STB
Method Np value,STB
1 log(qo) versus t 86,800 5 1/fw versus Np 86,800
2 qo versus Np 86,800 6 1/qo versus Np/qo 86,800
3 fo versus Np 86,800 7 Ershagis X-plot 145,000
4 log(fw) versus Np 86,800 8 Log(fwc) versus Np 95,000
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