A general compositional rescaled-exponential model for multiphase boundary-dominated performance analysis

Ryan Will, Luis F. Ayala

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Hydrocarbon reservoir performance forecasting is an integral component of the resource development chain and is typically accomplished via reservoir modeling using either numerical or analytical methods. Although complex numerical models provide rigorous means of capturing and predicting reservoir behavior, reservoir engineers also rely on simpler analytical models to analyze well performance and estimate reserves when uncertainties exist. Arps, for example, empirically demonstrated that certain reservoirs may decline according to simple, exponential, hyperbolic, or harmonic relationships; such behavior, however, does not extend to more complex scenarios, such as multi-phase reservoir depletion. Due to this limitation, an important research area for many years has been to transform the equations governing flow through porous media in such a way as to express complex reservoir performance in terms of closed analytical forms. In this work, it is demonstrated that rigorous compositional analysis may be coupled with analytical well performance estimations for reservoirs with complex fluid systems, and that the molar decline of individual hydrocarbon fluid fractions can be expressed in terms of rescaled-exponential equations for well performance analysis. This work demonstrates that, by the introduction of a new partial pseudo-pressure variables, it is possible to predict the decline behavior of individual fluid constituents of a variety of gas condensate reservoir systems characterized by widely varying richness and complex multi-phase flow scenarios. A new four-region flow model is proposed and validated to implement gas-condensate deliverability calculations at late times during variable bottomhole pressure production. Five case studies are presented to support each of the model capabilities stated above and validate the use of liquid-analog rescaled-exponentials for the prediction of production decline behavior for each of the hydrocarbon species.

Original languageEnglish (US)
Title of host publicationSociety of Petroleum Engineers - SPE Kingdom of Saudi Arabia Annual Technical Symposium and Exhibition 2018, SATS 2018
PublisherSociety of Petroleum Engineers
ISBN (Electronic)9781613996201
StatePublished - Jan 1 2018
EventSPE Kingdom of Saudi Arabia Annual Technical Symposium and Exhibition 2018, SATS 2018 - Dammam, Saudi Arabia
Duration: Apr 23 2018Apr 26 2018

Publication series

NameSociety of Petroleum Engineers - SPE Kingdom of Saudi Arabia Annual Technical Symposium and Exhibition 2018, SATS 2018

Conference

ConferenceSPE Kingdom of Saudi Arabia Annual Technical Symposium and Exhibition 2018, SATS 2018
CountrySaudi Arabia
CityDammam
Period4/23/184/26/18

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Fuel Technology

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  • Cite this

    Will, R., & Ayala, L. F. (2018). A general compositional rescaled-exponential model for multiphase boundary-dominated performance analysis. In Society of Petroleum Engineers - SPE Kingdom of Saudi Arabia Annual Technical Symposium and Exhibition 2018, SATS 2018 (Society of Petroleum Engineers - SPE Kingdom of Saudi Arabia Annual Technical Symposium and Exhibition 2018, SATS 2018). Society of Petroleum Engineers.