a time function havlena and odeh mbe.ppt

8/18/2019 A time function Havlena and Odeh MBE.ppt

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178408

A time function Havlena and Odeh M

Engr. Buduka Stanley, Energia Limited


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PRESENTATON O!T"NE

Introduction

Concept of material balance equation

Rational of study

Matematical model

!rapical approac

Case study

Conclusion

178408 " # time function $a%lena and &de MBE" Buduka St


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NTRO#!$TON

&ne of te goals of a reser%oir engineer is to obtain rele%ant data

ydrocarbon initially in place.

'rior to te estimation( )en te oil block is acquired, it sounds in

geologists and reser%oir engineers )o carry out e%aluation on t

importantly to te o)ners of te block.

#t te onset, it looks as if te reser%oir is filled )it large bubblescontrary to )at is obtainable in reality.



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NTRO#!$TON $ONT%#

*e oil and gas in te reser%oirs is actually distributed troug t

bet)een sand grains in te reser%oir layers.

$ence, one of te fundamental callenges before te geopysi

engineers and geologists is te ability for tis integrated

armoniously to obtain a near+eact %alue of te oil in plac

de%elopment and optimi-ation start.



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NTRO#!$TON $ONT%#

*ere are se%eral metods of estimating ydrocarbon %o

tese tecniques is te material balance metod )iclimitations toug can be used as a pre+processing tool to in

/luid in place, dri%e mecanisms and identify aquifer

sopisticated tool 0reser%oir simulation1 )ic gi%es insigt

rock and fluid properties for e%aluation of past reser%oir prediction of future reser%oir performance, and reser%e estim



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$ON$EPT O& MATERA" BA"AN$E E'!ATON

*e material balance equation is a comple equation for calculat

oil in place, cumulati%e )ater influ and te original si-e of tcompared to te oil -one si-e.

*is compleity prompted $a%lena and &de 234567 to epress

straigt line metod )ic in%ol%ed rearranging te MBE into a line

*e straigt lines metod requires te plotting of a %ariable anoter %ariable group selected depending on te dri%e mecanis

relationsip does not eist, ten tis de%iation suggests tat re

performing as anticipated.



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$ON$EPT O& MATERA" BA"AN$E E'!ATON $O

*e straigt line metod considered te underground reco%erab

epansion function Eg, dissol%ed gas+oil epansion function Eo, )rock contraction function Ef) as %ariable for plotting by considering

production at eac pressure.



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RATONA" O& ST!#(

*e alternati%e $a%lena and &de MBE model take a step up by c

reser%oir a%erage production rate per day as against cumulati%e use it to build te / function )ile te time remain as an indepe

making te plot a time function plot.

*e ad%antage and elegance of tis can be more appreciated

entreated and )orked out by it.



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MATHEMAT$A" MO#E"

*e &riginal $a%lena and &de Model

*e MBE for saturated reser%oir )ritten in symbols is



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MATHEMAT$A" MO#E" $ONT%#



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MATHEMAT$A" MO#E" $ONT%#



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)RAPH$A" APPROA$H

$ence

# plot of /8 against Eo9t: sould result in a straigt line scattered d

initial state and stabili-e into a linear form )it ; being te slop

noted tat te origin is not a must point.



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)RAPH$A" APPROA$H $ONT%#



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$ASE ST!#(

&uro 'rieto reser%oir )ic is an undersaturated reser%oir )it act

is considered )it a compreensi%e analysis of fluid data befomaterial balance model.



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$ASE ST!#( $ONT%#


Figure 1: Original material balance using F against E 0


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$ASE ST!#( $ONT%#


Figure 2: Alternative material balance model using the proposed m


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$ASE ST!#( $ONT%#

*able 3 Result from models


Original MBE Alternative MBE

Initial oil in place 2,303,332.45 2,213,838.27

Intercept 96.83 1.997

SSE 0.043%


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$ON$"!SON

Careful interest sould be paid to issues relating to incons

production rate and also uncertainty in te fluid properties

*e model is more applicable for ne)ly disco%ered reser

information on future production data pro%ided fluid data from n

)it similar reser%oir caracteristics are a%ailable

*e model duly ser%ed as a ceck to te original material baand &de straigt line MBE, terefore can be used to %alid

result.



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a time function havlena and odeh mbe.ppt

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