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

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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.