Gas-cap effects in pressure transient response of naturally fractured reservoirs

A. S. Al-Bemani, I. Ershaghi

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

Abstract

This paper presents a theoretical framework of gas cap effects in naturally fractured reservoirs. General pressure solutions are derived for both pseudo-steady state and unsteady state matrix-fracture interporosity flow. Deviation from the fracture or fracture-matrix response occurs as the gas cap effect is felt. Anomalous slope changes, during the transition period, depends entirely on the contrast between the fracture anisotropy parameter λ1 and matrix-fracture interporosity parameter λ, and between the total gap cap storage capacitance ω-1$/ and oil zone matrix storage ω. A composite double porosity response is observed for ω-1$/ ≤ ω-1c$/ and 1.0 ≤ λ1/λ ≤ 100.0. A triple porosity response is observed for ω-1$/ > ω-1c$/ and 140 < ωλ1/λ ≤ 1.0E05.

Original languageEnglish
Title of host publicationFormation Evaluation and Reservoir Geology
Editors Anon
PublisherPubl by Soc of Petroleum Engineers of AIME
Pages371-382
Number of pages12
VolumeOmega
Publication statusPublished - 1990
EventProceedings: SPE Annual Technical Conference and Exhibition 1990 - New Orleans, LA, USA
Duration: Sep 23 1990Sep 26 1990

Other

OtherProceedings: SPE Annual Technical Conference and Exhibition 1990
CityNew Orleans, LA, USA
Period9/23/909/26/90

Fingerprint

Transient analysis
matrix
Gases
gas
porosity
fracture flow
Porosity
pressure solution
anisotropy
Anisotropy
Capacitance
effect
oil
Composite materials
parameter

ASJC Scopus subject areas

  • Geology
  • Geotechnical Engineering and Engineering Geology

Cite this

Al-Bemani, A. S., & Ershaghi, I. (1990). Gas-cap effects in pressure transient response of naturally fractured reservoirs. In Anon (Ed.), Formation Evaluation and Reservoir Geology (Vol. Omega, pp. 371-382). Publ by Soc of Petroleum Engineers of AIME.

Gas-cap effects in pressure transient response of naturally fractured reservoirs. / Al-Bemani, A. S.; Ershaghi, I.

Formation Evaluation and Reservoir Geology. ed. / Anon. Vol. Omega Publ by Soc of Petroleum Engineers of AIME, 1990. p. 371-382.

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

Al-Bemani, AS & Ershaghi, I 1990, Gas-cap effects in pressure transient response of naturally fractured reservoirs. in Anon (ed.), Formation Evaluation and Reservoir Geology. vol. Omega, Publ by Soc of Petroleum Engineers of AIME, pp. 371-382, Proceedings: SPE Annual Technical Conference and Exhibition 1990, New Orleans, LA, USA, 9/23/90.
Al-Bemani AS, Ershaghi I. Gas-cap effects in pressure transient response of naturally fractured reservoirs. In Anon, editor, Formation Evaluation and Reservoir Geology. Vol. Omega. Publ by Soc of Petroleum Engineers of AIME. 1990. p. 371-382
Al-Bemani, A. S. ; Ershaghi, I. / Gas-cap effects in pressure transient response of naturally fractured reservoirs. Formation Evaluation and Reservoir Geology. editor / Anon. Vol. Omega Publ by Soc of Petroleum Engineers of AIME, 1990. pp. 371-382
@inproceedings{a73fcf1d9e554dcfbbf7a74b4b91ac2a,
title = "Gas-cap effects in pressure transient response of naturally fractured reservoirs",
abstract = "This paper presents a theoretical framework of gas cap effects in naturally fractured reservoirs. General pressure solutions are derived for both pseudo-steady state and unsteady state matrix-fracture interporosity flow. Deviation from the fracture or fracture-matrix response occurs as the gas cap effect is felt. Anomalous slope changes, during the transition period, depends entirely on the contrast between the fracture anisotropy parameter λ1 and matrix-fracture interporosity parameter λ, and between the total gap cap storage capacitance ω-1$/ and oil zone matrix storage ω. A composite double porosity response is observed for ω-1$/ ≤ ω-1c$/ and 1.0 ≤ λ1/λ ≤ 100.0. A triple porosity response is observed for ω-1$/ > ω-1c$/ and 140 < ωλ1/λ ≤ 1.0E05.",
author = "Al-Bemani, {A. S.} and I. Ershaghi",
year = "1990",
language = "English",
volume = "Omega",
pages = "371--382",
editor = "Anon",
booktitle = "Formation Evaluation and Reservoir Geology",
publisher = "Publ by Soc of Petroleum Engineers of AIME",

}

TY - GEN

T1 - Gas-cap effects in pressure transient response of naturally fractured reservoirs

AU - Al-Bemani, A. S.

AU - Ershaghi, I.

PY - 1990

Y1 - 1990

N2 - This paper presents a theoretical framework of gas cap effects in naturally fractured reservoirs. General pressure solutions are derived for both pseudo-steady state and unsteady state matrix-fracture interporosity flow. Deviation from the fracture or fracture-matrix response occurs as the gas cap effect is felt. Anomalous slope changes, during the transition period, depends entirely on the contrast between the fracture anisotropy parameter λ1 and matrix-fracture interporosity parameter λ, and between the total gap cap storage capacitance ω-1$/ and oil zone matrix storage ω. A composite double porosity response is observed for ω-1$/ ≤ ω-1c$/ and 1.0 ≤ λ1/λ ≤ 100.0. A triple porosity response is observed for ω-1$/ > ω-1c$/ and 140 < ωλ1/λ ≤ 1.0E05.

AB - This paper presents a theoretical framework of gas cap effects in naturally fractured reservoirs. General pressure solutions are derived for both pseudo-steady state and unsteady state matrix-fracture interporosity flow. Deviation from the fracture or fracture-matrix response occurs as the gas cap effect is felt. Anomalous slope changes, during the transition period, depends entirely on the contrast between the fracture anisotropy parameter λ1 and matrix-fracture interporosity parameter λ, and between the total gap cap storage capacitance ω-1$/ and oil zone matrix storage ω. A composite double porosity response is observed for ω-1$/ ≤ ω-1c$/ and 1.0 ≤ λ1/λ ≤ 100.0. A triple porosity response is observed for ω-1$/ > ω-1c$/ and 140 < ωλ1/λ ≤ 1.0E05.

UR - http://www.scopus.com/inward/record.url?scp=0025592939&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0025592939&partnerID=8YFLogxK

M3 - Conference contribution

VL - Omega

SP - 371

EP - 382

BT - Formation Evaluation and Reservoir Geology

A2 - Anon, null

PB - Publ by Soc of Petroleum Engineers of AIME

ER -