Analytical study of flowing and in-situ compositions in unconventional liquid-rich gas plays

Miao Zhang, Luis F. Ayala

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

2 Citations (Scopus)

Abstract

Liquid-rich gases in unconventional reservoir environments can exhibit complex phase and flow behavior due to gas condensation and re-vaporization and differences in phase mobilities that results in compositional variations inside the system. To date, the analysis of in situ and flowing composition variation in unconventional liquid-rich wells has been largely limited to numerical modeling. This work uses an analytical approach to study the in situ and flowing fluid composition of gas condensate wells producing under infinite-acting linear flow - a commonly observed flow regime in hydraulically-fractured horizontal wells in unconventional formations. We propose a semi-analytical solution to the governing partial differential equations (PDEs) written in terms a compositional fluid formulation. The proposed solution is developed using Boltzmann's transformation and is validated by both analytical development and numerical simulation data. Results corroborate that when hydraulically-fractured horizontal wells are producing against a constant bottomhole pressure (BHP) constraint, the producing wellbore fluid composition remains constant as long as the system remains infinite acting, leading to a constant producing gas-oil ratio (GOR). This constant wellstream composition is shown to be very different from in situ composition, which varies according to pressure and production condition inside the reservoir.

Original languageEnglish (US)
Title of host publicationSociety of Petroleum Engineers - SPE Annual Technical Conference and Exhibition, ATCE 2016
PublisherSociety of Petroleum Engineers (SPE)
ISBN (Electronic)9781613994634
StatePublished - Jan 1 2016
EventSPE Annual Technical Conference and Exhibition, ATCE 2016 - Dubai, United Arab Emirates
Duration: Sep 26 2016Sep 28 2016

Publication series

NameProceedings - SPE Annual Technical Conference and Exhibition
Volume2016-January

Other

OtherSPE Annual Technical Conference and Exhibition, ATCE 2016
CountryUnited Arab Emirates
CityDubai
Period9/26/169/28/16

Fingerprint

Liquids
Chemical analysis
Gases
Horizontal wells
Fluids
Gas condensates
Gas oils
Vaporization
Partial differential equations
Condensation
Computer simulation

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

Zhang, M., & Ayala, L. F. (2016). Analytical study of flowing and in-situ compositions in unconventional liquid-rich gas plays. In Society of Petroleum Engineers - SPE Annual Technical Conference and Exhibition, ATCE 2016 (Proceedings - SPE Annual Technical Conference and Exhibition; Vol. 2016-January). Society of Petroleum Engineers (SPE).
Zhang, Miao ; Ayala, Luis F. / Analytical study of flowing and in-situ compositions in unconventional liquid-rich gas plays. Society of Petroleum Engineers - SPE Annual Technical Conference and Exhibition, ATCE 2016. Society of Petroleum Engineers (SPE), 2016. (Proceedings - SPE Annual Technical Conference and Exhibition).
@inproceedings{35b4211017be4c34aa7df20d5726d998,
title = "Analytical study of flowing and in-situ compositions in unconventional liquid-rich gas plays",
abstract = "Liquid-rich gases in unconventional reservoir environments can exhibit complex phase and flow behavior due to gas condensation and re-vaporization and differences in phase mobilities that results in compositional variations inside the system. To date, the analysis of in situ and flowing composition variation in unconventional liquid-rich wells has been largely limited to numerical modeling. This work uses an analytical approach to study the in situ and flowing fluid composition of gas condensate wells producing under infinite-acting linear flow - a commonly observed flow regime in hydraulically-fractured horizontal wells in unconventional formations. We propose a semi-analytical solution to the governing partial differential equations (PDEs) written in terms a compositional fluid formulation. The proposed solution is developed using Boltzmann's transformation and is validated by both analytical development and numerical simulation data. Results corroborate that when hydraulically-fractured horizontal wells are producing against a constant bottomhole pressure (BHP) constraint, the producing wellbore fluid composition remains constant as long as the system remains infinite acting, leading to a constant producing gas-oil ratio (GOR). This constant wellstream composition is shown to be very different from in situ composition, which varies according to pressure and production condition inside the reservoir.",
author = "Miao Zhang and Ayala, {Luis F.}",
year = "2016",
month = "1",
day = "1",
language = "English (US)",
series = "Proceedings - SPE Annual Technical Conference and Exhibition",
publisher = "Society of Petroleum Engineers (SPE)",
booktitle = "Society of Petroleum Engineers - SPE Annual Technical Conference and Exhibition, ATCE 2016",
address = "United States",

}

Zhang, M & Ayala, LF 2016, Analytical study of flowing and in-situ compositions in unconventional liquid-rich gas plays. in Society of Petroleum Engineers - SPE Annual Technical Conference and Exhibition, ATCE 2016. Proceedings - SPE Annual Technical Conference and Exhibition, vol. 2016-January, Society of Petroleum Engineers (SPE), SPE Annual Technical Conference and Exhibition, ATCE 2016, Dubai, United Arab Emirates, 9/26/16.

Analytical study of flowing and in-situ compositions in unconventional liquid-rich gas plays. / Zhang, Miao; Ayala, Luis F.

Society of Petroleum Engineers - SPE Annual Technical Conference and Exhibition, ATCE 2016. Society of Petroleum Engineers (SPE), 2016. (Proceedings - SPE Annual Technical Conference and Exhibition; Vol. 2016-January).

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

TY - GEN

T1 - Analytical study of flowing and in-situ compositions in unconventional liquid-rich gas plays

AU - Zhang, Miao

AU - Ayala, Luis F.

PY - 2016/1/1

Y1 - 2016/1/1

N2 - Liquid-rich gases in unconventional reservoir environments can exhibit complex phase and flow behavior due to gas condensation and re-vaporization and differences in phase mobilities that results in compositional variations inside the system. To date, the analysis of in situ and flowing composition variation in unconventional liquid-rich wells has been largely limited to numerical modeling. This work uses an analytical approach to study the in situ and flowing fluid composition of gas condensate wells producing under infinite-acting linear flow - a commonly observed flow regime in hydraulically-fractured horizontal wells in unconventional formations. We propose a semi-analytical solution to the governing partial differential equations (PDEs) written in terms a compositional fluid formulation. The proposed solution is developed using Boltzmann's transformation and is validated by both analytical development and numerical simulation data. Results corroborate that when hydraulically-fractured horizontal wells are producing against a constant bottomhole pressure (BHP) constraint, the producing wellbore fluid composition remains constant as long as the system remains infinite acting, leading to a constant producing gas-oil ratio (GOR). This constant wellstream composition is shown to be very different from in situ composition, which varies according to pressure and production condition inside the reservoir.

AB - Liquid-rich gases in unconventional reservoir environments can exhibit complex phase and flow behavior due to gas condensation and re-vaporization and differences in phase mobilities that results in compositional variations inside the system. To date, the analysis of in situ and flowing composition variation in unconventional liquid-rich wells has been largely limited to numerical modeling. This work uses an analytical approach to study the in situ and flowing fluid composition of gas condensate wells producing under infinite-acting linear flow - a commonly observed flow regime in hydraulically-fractured horizontal wells in unconventional formations. We propose a semi-analytical solution to the governing partial differential equations (PDEs) written in terms a compositional fluid formulation. The proposed solution is developed using Boltzmann's transformation and is validated by both analytical development and numerical simulation data. Results corroborate that when hydraulically-fractured horizontal wells are producing against a constant bottomhole pressure (BHP) constraint, the producing wellbore fluid composition remains constant as long as the system remains infinite acting, leading to a constant producing gas-oil ratio (GOR). This constant wellstream composition is shown to be very different from in situ composition, which varies according to pressure and production condition inside the reservoir.

UR - http://www.scopus.com/inward/record.url?scp=84994121252&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84994121252&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84994121252

T3 - Proceedings - SPE Annual Technical Conference and Exhibition

BT - Society of Petroleum Engineers - SPE Annual Technical Conference and Exhibition, ATCE 2016

PB - Society of Petroleum Engineers (SPE)

ER -

Zhang M, Ayala LF. Analytical study of flowing and in-situ compositions in unconventional liquid-rich gas plays. In Society of Petroleum Engineers - SPE Annual Technical Conference and Exhibition, ATCE 2016. Society of Petroleum Engineers (SPE). 2016. (Proceedings - SPE Annual Technical Conference and Exhibition).