Gas-production-data analysis of variable-pressure-drawdown/variable-rate systems: A density-based approach

Miao Zhang, Luis Ayala H.

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

This study demonstrates that production-data analysis of variablebottomhole-flowing-pressure/variable-rate gas wells under boundary-dominated flow (BDF) is possible by use of a density-based approach. In this approach, governing equations are expressed in terms of density variables and dimensionless viscosity/compressibility ratios. Previously, the methodology was successfully used to derive rescaled exponential models for gas-rate-decline analysis of wells primarily producing at constant bottomhole pressure (Ayala and Ye 2013a, b; Ayala and Zhang 2013; Ye and Ayala 2013; Zhang and Ayala 2014). For the case of natural-gas systems experiencing BDF, gas-well-performance analysis has been made largely possible by invoking the concepts of pseudotime, normalized pseudotime, or material-balance pseudotime. The density-based methodology rigorously derived in this study, however, does not use any type of pseudotime calculations, even for variable-rate/variablepressure-drawdown cases. The methodology enables straightforward original-gas-in-place calculations and gas-well-performance forecasting by means of type curves or straight-line analysis. A number of field and numerical case studies are presented to showcase the capabilities of the proposed approach.

Original languageEnglish (US)
Pages (from-to)520-529
Number of pages10
JournalSPE Reservoir Evaluation and Engineering
Volume17
Issue number4
DOIs
StatePublished - Nov 1 2014

Fingerprint

gas well
drawdown
gas production
methodology
Gases
compressibility
gas
natural gas
viscosity
well
Compressibility
Density (specific gravity)
Natural gas
rate
analysis
data analysis
Viscosity
calculation

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Energy Engineering and Power Technology
  • Geology

Cite this

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title = "Gas-production-data analysis of variable-pressure-drawdown/variable-rate systems: A density-based approach",
abstract = "This study demonstrates that production-data analysis of variablebottomhole-flowing-pressure/variable-rate gas wells under boundary-dominated flow (BDF) is possible by use of a density-based approach. In this approach, governing equations are expressed in terms of density variables and dimensionless viscosity/compressibility ratios. Previously, the methodology was successfully used to derive rescaled exponential models for gas-rate-decline analysis of wells primarily producing at constant bottomhole pressure (Ayala and Ye 2013a, b; Ayala and Zhang 2013; Ye and Ayala 2013; Zhang and Ayala 2014). For the case of natural-gas systems experiencing BDF, gas-well-performance analysis has been made largely possible by invoking the concepts of pseudotime, normalized pseudotime, or material-balance pseudotime. The density-based methodology rigorously derived in this study, however, does not use any type of pseudotime calculations, even for variable-rate/variablepressure-drawdown cases. The methodology enables straightforward original-gas-in-place calculations and gas-well-performance forecasting by means of type curves or straight-line analysis. A number of field and numerical case studies are presented to showcase the capabilities of the proposed approach.",
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Gas-production-data analysis of variable-pressure-drawdown/variable-rate systems : A density-based approach. / Zhang, Miao; Ayala H., Luis.

In: SPE Reservoir Evaluation and Engineering, Vol. 17, No. 4, 01.11.2014, p. 520-529.

Research output: Contribution to journalArticle

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