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 language | English |
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Pages (from-to) | 40-45 |
Number of pages | 6 |
Journal | SPE Formation Evaluation |
Volume | 12 |
Issue number | 1 |
DOIs | |
Publication status | Published - Mar 1997 |
Externally published | Yes |
ASJC Scopus subject areas
- Process Chemistry and Technology