Straightline analysis of flow rate vs. cumulative-production data for the explicit determination of gas reserves

Peng Ye, F. Luis, H. Ayala

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Production forecasting and prediction of original fluids in place are important gas-well-performance evaluations which are routinely conducted using rate/time decline-curve analysis. Currently, rate/time decline-curve analysis of natural-gas reservoirs relies heavily on the use of empirical curve fitting of boundarydominated rate/time production data using type curves or the Arps hyperbolic decline model. In this study, we show that originalfluids-in-place prediction and gas-well-performance evaluations can be conducted simply by straightline analysis of boundarydominated data in flow-rate vs. cumulative-production plots. We first analytically demonstrate that the hyperbolic decline exponent describing the depletion of single-phase volumetric gas reservoirs is not subject to empirical determination from rate/time data. Decline behaviour of gas wells producing at less than full potential is also shown to exhibit a hybrid decline character: hyperbolic during early boundary-dominated flow and exponential at later times. In both cases, explicit calculations of hyperbolic decline coefficients are possible, thus enabling the explicit calculation of gas reserves using flow-rate vs. cumulative-production straightline plots. Numerical and field case studies are presented to demonstrate the applicability and generality of the proposed reservesdetermination methodology.

Original languageEnglish (US)
Pages (from-to)296-305
Number of pages10
JournalJournal of Canadian Petroleum Technology
Volume52
Issue number4
DOIs
StatePublished - Jul 2013

Fingerprint

Gases
Flow rate
Curve fitting
Natural gas
Fluids

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

@article{fd61f5155f6e4baf836f6049f4928c0e,
title = "Straightline analysis of flow rate vs. cumulative-production data for the explicit determination of gas reserves",
abstract = "Production forecasting and prediction of original fluids in place are important gas-well-performance evaluations which are routinely conducted using rate/time decline-curve analysis. Currently, rate/time decline-curve analysis of natural-gas reservoirs relies heavily on the use of empirical curve fitting of boundarydominated rate/time production data using type curves or the Arps hyperbolic decline model. In this study, we show that originalfluids-in-place prediction and gas-well-performance evaluations can be conducted simply by straightline analysis of boundarydominated data in flow-rate vs. cumulative-production plots. We first analytically demonstrate that the hyperbolic decline exponent describing the depletion of single-phase volumetric gas reservoirs is not subject to empirical determination from rate/time data. Decline behaviour of gas wells producing at less than full potential is also shown to exhibit a hybrid decline character: hyperbolic during early boundary-dominated flow and exponential at later times. In both cases, explicit calculations of hyperbolic decline coefficients are possible, thus enabling the explicit calculation of gas reserves using flow-rate vs. cumulative-production straightline plots. Numerical and field case studies are presented to demonstrate the applicability and generality of the proposed reservesdetermination methodology.",
author = "Peng Ye and F. Luis and H. Ayala",
year = "2013",
month = "7",
doi = "10.2118/165583-PA",
language = "English (US)",
volume = "52",
pages = "296--305",
journal = "Journal of Canadian Petroleum Technology",
issn = "0021-9487",
publisher = "Canadian Institute of Mining",
number = "4",

}

Straightline analysis of flow rate vs. cumulative-production data for the explicit determination of gas reserves. / Ye, Peng; Luis, F.; Ayala, H.

In: Journal of Canadian Petroleum Technology, Vol. 52, No. 4, 07.2013, p. 296-305.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Straightline analysis of flow rate vs. cumulative-production data for the explicit determination of gas reserves

AU - Ye, Peng

AU - Luis, F.

AU - Ayala, H.

PY - 2013/7

Y1 - 2013/7

N2 - Production forecasting and prediction of original fluids in place are important gas-well-performance evaluations which are routinely conducted using rate/time decline-curve analysis. Currently, rate/time decline-curve analysis of natural-gas reservoirs relies heavily on the use of empirical curve fitting of boundarydominated rate/time production data using type curves or the Arps hyperbolic decline model. In this study, we show that originalfluids-in-place prediction and gas-well-performance evaluations can be conducted simply by straightline analysis of boundarydominated data in flow-rate vs. cumulative-production plots. We first analytically demonstrate that the hyperbolic decline exponent describing the depletion of single-phase volumetric gas reservoirs is not subject to empirical determination from rate/time data. Decline behaviour of gas wells producing at less than full potential is also shown to exhibit a hybrid decline character: hyperbolic during early boundary-dominated flow and exponential at later times. In both cases, explicit calculations of hyperbolic decline coefficients are possible, thus enabling the explicit calculation of gas reserves using flow-rate vs. cumulative-production straightline plots. Numerical and field case studies are presented to demonstrate the applicability and generality of the proposed reservesdetermination methodology.

AB - Production forecasting and prediction of original fluids in place are important gas-well-performance evaluations which are routinely conducted using rate/time decline-curve analysis. Currently, rate/time decline-curve analysis of natural-gas reservoirs relies heavily on the use of empirical curve fitting of boundarydominated rate/time production data using type curves or the Arps hyperbolic decline model. In this study, we show that originalfluids-in-place prediction and gas-well-performance evaluations can be conducted simply by straightline analysis of boundarydominated data in flow-rate vs. cumulative-production plots. We first analytically demonstrate that the hyperbolic decline exponent describing the depletion of single-phase volumetric gas reservoirs is not subject to empirical determination from rate/time data. Decline behaviour of gas wells producing at less than full potential is also shown to exhibit a hybrid decline character: hyperbolic during early boundary-dominated flow and exponential at later times. In both cases, explicit calculations of hyperbolic decline coefficients are possible, thus enabling the explicit calculation of gas reserves using flow-rate vs. cumulative-production straightline plots. Numerical and field case studies are presented to demonstrate the applicability and generality of the proposed reservesdetermination methodology.

UR - http://www.scopus.com/inward/record.url?scp=84884519429&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84884519429&partnerID=8YFLogxK

U2 - 10.2118/165583-PA

DO - 10.2118/165583-PA

M3 - Article

AN - SCOPUS:84884519429

VL - 52

SP - 296

EP - 305

JO - Journal of Canadian Petroleum Technology

JF - Journal of Canadian Petroleum Technology

SN - 0021-9487

IS - 4

ER -