A density-based material balance equation for the analysis of liquid-rich natural gas systems

Miao Zhang, Luis Ayala H.

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This study analytically cross examines the consistency among available zero-dimensional material balance equations (MBEs) for liquid-rich gas equations and derive a new simple yet rigorous MBE starting from governing equations applicable to these systems. We propose a new zero-dimensional (tank) material balance equation directly applicable to the analysis of liquid-rich (wet and retrograde) gas reservoirs expressed as a function of an equivalent gas molar density, as well as investigate and critically compare its predictions against other zero-dimensional (tank) models proposed in the past for gas reservoir cases with different amounts of condensate content (lean, intermediate and rich). All models are employed to predict reservoir performance given reservoir original-fluids-in-place and compared against benchmark examples created by numerical simulation. Actual field examples are also analyzed using existing and proposed models to test their ability to provide reliable reserve estimations using straight-line methods. The proposed density-based equation is proven to be straightforward to implement since it is written in terms of density, which allows it be directly expressed as an extension of the dry gas MBE, while not requiring the implementation of two-phase Z-factors.

Original languageEnglish (US)
Pages (from-to)705-718
Number of pages14
JournalJournal of Petroleum Exploration and Production Technology
Volume6
Issue number4
DOIs
StatePublished - Dec 1 2016

Fingerprint

liquefied natural gas
Natural gas
Liquids
Gases
gas
liquid
condensate
analysis
material
Fluids
Computer simulation
fluid
prediction
simulation

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Energy(all)

Cite this

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A density-based material balance equation for the analysis of liquid-rich natural gas systems. / Zhang, Miao; Ayala H., Luis.

In: Journal of Petroleum Exploration and Production Technology, Vol. 6, No. 4, 01.12.2016, p. 705-718.

Research output: Contribution to journalArticle

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