Decline Curves_By Gustavo Milla Flores_English Intermediate Two_final Version

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Instituto Mexicano del Petrleo

Classroom G2

ENGLISH INTERMEDIATE

Decline Curves

Teacher: Roberto Hinojosa

Gustavo Milla Flores

Date: 24/July/2014


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ObjectiveTo present a easy and practical tool in the reservoir engineering toforecast the average reservoir rate to plan what actions are necessary tomaintenance a economical production.


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Introduction

Reservoir

life

cycle

Reservoir

performance

Natural

R

eservoir

T

endence

Forecast

:Decline Curves

Exponential

Hyperbolic

Harmonic

Example

Closure

Content


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Introduction

Reservoir management

Maximize profits/proftitability indexfrom a reservoir

Optimizing recovery

Minimizing capital investment.


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Discovery

Delineation

Development

Primary

Secondary

Tertiary

Abandonment

Exploration

Reservoir

life

CycleBasinProspectPlay


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Reservoir

performance

WOR

Oil Rate

GOR

Pressure

No Well

Time Years

Oilproduct

ionstb/day

Pr

essure[psi]

WOR

GOR

NoWell


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Natural Reservoir Tendence

Oilproductionstb

/day

Time Years


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Economic limit

The so-called Economic Limit is when extrapolating the graphreaches a point where the value of the production of oil or gas,is equivalent to the cost of production. To continue with theoperation, the expenses would be higher than income.

Qo

t

E.L.


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Flowregimes

Semi steady-State flow

Exponential Hyperblic Harmonic

Unsteadystate flow

Decline curves


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Decline Curves


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Clasification of productiondecline curves

Decline Curves


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Example Exponentialdeclination

Fecha T[aos] Qo [m3/da]

ene-81 1 100

ene-82 2 60

ene-83 3 44

ene-84 4 34

ene-85 5 28ene-86 6 23.5

ene-87 7 20

ene-88 8 17

ene-89 9 14.5

ene-90 10 12.3

ene-91 11 10.4

ene-92 12 8.9


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Declination curves are used to forecast the production

rate and predict the limit economic.

It is a tool to analize the reservoir behavior versustime.

Its important to compare with other methods likenumerical simulation

Closure


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Agarwal, R. G., Gardner, D. C., Kleinsteiber, S. W., and Fussell, D. D.,Analyzing Well Production Data Using Combined Type Curve andDecline Curve Analysis Concepts, SPE 49222, SPE Annual TechnicalConference and Exhibition, New Orleans, LA, September 1998.

2. Agarwal, R. G., Al-Hussainy, R., and Ramey, H. J. (1970). AnInvestigation of Wellbore Storage and Skin Effect t in Unsteady LiquidFlow. SPE J. September 1970, pp. 279290.

3. Anash, J., Blasingame, T. A., and Knowles, R. S., A Semi-Analytic

(p/z) RateTime Relation for the Analysis and Prediction of Gas WellPerformance , SPE Reservoir Eval. & Eng. 3(6), December 2000

References

Decline Curves_By Gustavo Milla Flores_English Intermediate Two_final Version

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