1

Pe523AnalysisofWORPerformance

Dr. Saber Elmabrouk

Steady-State WOR Model

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Linear log(krw/kro) versus Sw rorww kk

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Conventional WOR Analysis

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Conventional WOR Analysis log(fw) versus Np

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Conventional WOR Analysis log(fw) versus Np

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Pseudosteady-State WOR Model

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Blasingame and Lee

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Pseudosteady-State WOR Model

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Pseudosteady-State WOR Model

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Pseudosteady-State WOR Model

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Pseudosteady-State WOR Model log(fw) versus Np

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Pseudosteady-State WOR Model log(fw) versus Np

Pseudosteady-State WOR Model Results from the PSS WOR model versus the field production data

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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

5

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

6

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

7

1/fw=1

Analysis of WOR Data 1/fw versus Np

1/qo

Np /qo

Analysis of WOR Data 1/qo versus Np/qo

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Reciprocal of qo versus oil material balance time

Analysis of WOR Data

8

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Analysis of WOR Data 1/qo versus Np/qo

Np,mov = 164,500 STB

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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

9

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