Production data analysis for dual-porosity gas/liquid systems: A density-based approach

Zhenzihao Zhang, F. Luis, Luis Ayala H.

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Production data analysis impacts assets value and financial decisions significantly. Naturally fractured reservoirs exist widely around the world. A common method to represent naturally fractured reservoirs is dual-porosity model. Intrinsic characteristics of dual-porosity systems and their unique rate-transient profile require models able to capture well behavior and to achieve production data analysis, which is a proven difficulty for dual-porosity gas system and not completely solved. Moreover, past studies on dual-porosity systems assume constant bottom-hole pressure (BHP) or constant rate production, which impose significant constraint to production data analysis. Recently a density-based approach for analyzing production data was proposed for single-porosity system, which has been proven to successfully describe gas well behavior under boundary-dominated flow (BDF). Using depletion-driven parameters, λ and β this state-of-the-art approach circumvents pseudo time. It was then extended to variable-pressure-drawdown/variable-rate gas systems and proven successful. In this study, we adopt a rigorously derived interporosity flow equation for gas, which captures viscosity-compressibility change of matrix outflow. Based on that, a density-based, rescaled exponential model for variable pressure drawdown/variable rate production was developed for dual-porosity gas system. Also, we explore straight-line analysis for convenient prediction of OGIP and production rate. The density-based model is tested in a variety of scenarios to showcase its validity. Moreover, based on Warren and Root model, a density-based exponential model for variable pressure drawdown/variable rate in dual-porosity liquid system is proposed and fully verified. A straight-line analysis is proposed to enable explicit OOIP prediction and convenient future production calculation. Moreover, a convenient double-exponential decline model under constant BHP is developed for liquid. To summarize our work, we developed rate-transient analysis method for two types of reservoirs-naturally fractured gas reservoir and naturally fractured oil reservoirs-producing at arbitrary type of production scenario in boundary-dominated-flow stage. The proposed method can evaluate reserve in a convenient and accurate manner. Moreover, the method to predict production using the theory is also provided. An explicit equation correlating dimensionless production rate and dimensionless time is also developed for dual-porosity liquid system producing at constant bottomhole pressure in both early transient stage and boundary-dominated-flow stage.

Original languageEnglish (US)
Pages (from-to)143-159
Number of pages17
JournalJournal of Natural Gas Science and Engineering
Volume46
DOIs
StatePublished - Jan 1 2017

Fingerprint

Density (specific gravity)
Porosity
Liquids
Gases
Bottom hole pressure
Compressibility
Transient analysis
Viscosity

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology

Cite this

@article{fd967ac45f884a029b67071a84a2f36c,
title = "Production data analysis for dual-porosity gas/liquid systems: A density-based approach",
abstract = "Production data analysis impacts assets value and financial decisions significantly. Naturally fractured reservoirs exist widely around the world. A common method to represent naturally fractured reservoirs is dual-porosity model. Intrinsic characteristics of dual-porosity systems and their unique rate-transient profile require models able to capture well behavior and to achieve production data analysis, which is a proven difficulty for dual-porosity gas system and not completely solved. Moreover, past studies on dual-porosity systems assume constant bottom-hole pressure (BHP) or constant rate production, which impose significant constraint to production data analysis. Recently a density-based approach for analyzing production data was proposed for single-porosity system, which has been proven to successfully describe gas well behavior under boundary-dominated flow (BDF). Using depletion-driven parameters, λ and β this state-of-the-art approach circumvents pseudo time. It was then extended to variable-pressure-drawdown/variable-rate gas systems and proven successful. In this study, we adopt a rigorously derived interporosity flow equation for gas, which captures viscosity-compressibility change of matrix outflow. Based on that, a density-based, rescaled exponential model for variable pressure drawdown/variable rate production was developed for dual-porosity gas system. Also, we explore straight-line analysis for convenient prediction of OGIP and production rate. The density-based model is tested in a variety of scenarios to showcase its validity. Moreover, based on Warren and Root model, a density-based exponential model for variable pressure drawdown/variable rate in dual-porosity liquid system is proposed and fully verified. A straight-line analysis is proposed to enable explicit OOIP prediction and convenient future production calculation. Moreover, a convenient double-exponential decline model under constant BHP is developed for liquid. To summarize our work, we developed rate-transient analysis method for two types of reservoirs-naturally fractured gas reservoir and naturally fractured oil reservoirs-producing at arbitrary type of production scenario in boundary-dominated-flow stage. The proposed method can evaluate reserve in a convenient and accurate manner. Moreover, the method to predict production using the theory is also provided. An explicit equation correlating dimensionless production rate and dimensionless time is also developed for dual-porosity liquid system producing at constant bottomhole pressure in both early transient stage and boundary-dominated-flow stage.",
author = "Zhenzihao Zhang and F. Luis and {Ayala H.}, Luis",
year = "2017",
month = "1",
day = "1",
doi = "10.1016/j.jngse.2017.07.007",
language = "English (US)",
volume = "46",
pages = "143--159",
journal = "Journal of Natural Gas Science and Engineering",
issn = "1875-5100",
publisher = "Elsevier",

}

Production data analysis for dual-porosity gas/liquid systems : A density-based approach. / Zhang, Zhenzihao; Luis, F.; Ayala H., Luis.

In: Journal of Natural Gas Science and Engineering, Vol. 46, 01.01.2017, p. 143-159.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Production data analysis for dual-porosity gas/liquid systems

T2 - A density-based approach

AU - Zhang, Zhenzihao

AU - Luis, F.

AU - Ayala H., Luis

PY - 2017/1/1

Y1 - 2017/1/1

N2 - Production data analysis impacts assets value and financial decisions significantly. Naturally fractured reservoirs exist widely around the world. A common method to represent naturally fractured reservoirs is dual-porosity model. Intrinsic characteristics of dual-porosity systems and their unique rate-transient profile require models able to capture well behavior and to achieve production data analysis, which is a proven difficulty for dual-porosity gas system and not completely solved. Moreover, past studies on dual-porosity systems assume constant bottom-hole pressure (BHP) or constant rate production, which impose significant constraint to production data analysis. Recently a density-based approach for analyzing production data was proposed for single-porosity system, which has been proven to successfully describe gas well behavior under boundary-dominated flow (BDF). Using depletion-driven parameters, λ and β this state-of-the-art approach circumvents pseudo time. It was then extended to variable-pressure-drawdown/variable-rate gas systems and proven successful. In this study, we adopt a rigorously derived interporosity flow equation for gas, which captures viscosity-compressibility change of matrix outflow. Based on that, a density-based, rescaled exponential model for variable pressure drawdown/variable rate production was developed for dual-porosity gas system. Also, we explore straight-line analysis for convenient prediction of OGIP and production rate. The density-based model is tested in a variety of scenarios to showcase its validity. Moreover, based on Warren and Root model, a density-based exponential model for variable pressure drawdown/variable rate in dual-porosity liquid system is proposed and fully verified. A straight-line analysis is proposed to enable explicit OOIP prediction and convenient future production calculation. Moreover, a convenient double-exponential decline model under constant BHP is developed for liquid. To summarize our work, we developed rate-transient analysis method for two types of reservoirs-naturally fractured gas reservoir and naturally fractured oil reservoirs-producing at arbitrary type of production scenario in boundary-dominated-flow stage. The proposed method can evaluate reserve in a convenient and accurate manner. Moreover, the method to predict production using the theory is also provided. An explicit equation correlating dimensionless production rate and dimensionless time is also developed for dual-porosity liquid system producing at constant bottomhole pressure in both early transient stage and boundary-dominated-flow stage.

AB - Production data analysis impacts assets value and financial decisions significantly. Naturally fractured reservoirs exist widely around the world. A common method to represent naturally fractured reservoirs is dual-porosity model. Intrinsic characteristics of dual-porosity systems and their unique rate-transient profile require models able to capture well behavior and to achieve production data analysis, which is a proven difficulty for dual-porosity gas system and not completely solved. Moreover, past studies on dual-porosity systems assume constant bottom-hole pressure (BHP) or constant rate production, which impose significant constraint to production data analysis. Recently a density-based approach for analyzing production data was proposed for single-porosity system, which has been proven to successfully describe gas well behavior under boundary-dominated flow (BDF). Using depletion-driven parameters, λ and β this state-of-the-art approach circumvents pseudo time. It was then extended to variable-pressure-drawdown/variable-rate gas systems and proven successful. In this study, we adopt a rigorously derived interporosity flow equation for gas, which captures viscosity-compressibility change of matrix outflow. Based on that, a density-based, rescaled exponential model for variable pressure drawdown/variable rate production was developed for dual-porosity gas system. Also, we explore straight-line analysis for convenient prediction of OGIP and production rate. The density-based model is tested in a variety of scenarios to showcase its validity. Moreover, based on Warren and Root model, a density-based exponential model for variable pressure drawdown/variable rate in dual-porosity liquid system is proposed and fully verified. A straight-line analysis is proposed to enable explicit OOIP prediction and convenient future production calculation. Moreover, a convenient double-exponential decline model under constant BHP is developed for liquid. To summarize our work, we developed rate-transient analysis method for two types of reservoirs-naturally fractured gas reservoir and naturally fractured oil reservoirs-producing at arbitrary type of production scenario in boundary-dominated-flow stage. The proposed method can evaluate reserve in a convenient and accurate manner. Moreover, the method to predict production using the theory is also provided. An explicit equation correlating dimensionless production rate and dimensionless time is also developed for dual-porosity liquid system producing at constant bottomhole pressure in both early transient stage and boundary-dominated-flow stage.

UR - http://www.scopus.com/inward/record.url?scp=85030865568&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85030865568&partnerID=8YFLogxK

U2 - 10.1016/j.jngse.2017.07.007

DO - 10.1016/j.jngse.2017.07.007

M3 - Article

AN - SCOPUS:85030865568

VL - 46

SP - 143

EP - 159

JO - Journal of Natural Gas Science and Engineering

JF - Journal of Natural Gas Science and Engineering

SN - 1875-5100

ER -