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

Ali Soud Al-Bemani, U. Sultan Qabous, Iraj Ershaghi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This paper presents a theoretical framework of gas-cap effects in naturally fractured reservoirs. General pressure solutions are derived for both pseudosteady-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 depend entirely on the contrast between the fracture anisotropy parameter,λ1, and matrix-fracture interporosity parameter, λ, and between the total gas-cap storage capacitance (1 - ω1) and oil-zone matrix storage (1 - ω). A composite double-porosity response is observed for ω1 ≤ ω1c and 1.0 ≤ λ1/λ ≤ 1000. A triple-porosity response is observed for ω1 ≥ ω1c and 140 < ωλ1/λ < 1.0E05.

Original languageEnglish
Pages (from-to)40-45
Number of pages6
JournalSPE Formation Evaluation
Volume12
Issue number1
Publication statusPublished - Mar 1997

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Transient analysis
Gases
Porosity
Oils
Anisotropy
Capacitance
Composite materials

ASJC Scopus subject areas

  • Process Chemistry and Technology

Cite this

Gas-cap effects in pressure-transient response of naturally fractured reservoirs. / Al-Bemani, Ali Soud; Sultan Qabous, U.; Ershaghi, Iraj.

In: SPE Formation Evaluation, Vol. 12, No. 1, 03.1997, p. 40-45.

Research output: Contribution to journalArticle

Al-Bemani, Ali Soud ; Sultan Qabous, U. ; Ershaghi, Iraj. / Gas-cap effects in pressure-transient response of naturally fractured reservoirs. In: SPE Formation Evaluation. 1997 ; Vol. 12, No. 1. pp. 40-45.
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