A time function Havlena and Odeh MBE.ppt
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Transcript of A time function Havlena and Odeh MBE.ppt
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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.
178408 " # time function $a%lena and &de MBE" Buduka St
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NTRO#!$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
178408 " # time function $a%lena and &de MBE" Buduka St
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$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
178408 " # time function $a%lena and &de MBE" Buduka St
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MATHEMAT$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 $ONT%#
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)RAPH$A" APPROA$H $ONT%#
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)RAPH$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%#
178408 " # time function $a%lena and &de MBE" Buduka St
Figure 1: Original material balance using F against E 0
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$ASE ST!#( $ONT%#
178408 " # time function $a%lena and &de MBE" Buduka St
Figure 2: Alternative material balance model using the proposed m
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$ASE ST!#( $ONT%#
*able 3 Result from models
178408 " # time function $a%lena and &de MBE" Buduka St
Original MBE Alternative MBE
Initial oil in place 2,303,332.45 2,213,838.27
Intercept 96.83 1.997
SSE 0.043%
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$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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