Reply to discussion of measurements of supersaturation and critical gas saturation

Journal Article · Wed Jun 01 00:00:00 EDT 1994 · SPE Formation Evaluation (Society of Petroleum Engineers); (United States)

OSTI ID:6993098

Firoozabadi, A; Mikkelsen, M; Ottesen, B

The authors fail to see the validity of this discussion. However, they hope this response will clarify some misconceptions of Saidi and in the literature on the subject of critical gas saturation in porous media. They divide Said's discussion into two main propositions. (1) Initial gas flow in a core during depressurization is caused by the flow of gas bubbles from the top of the core. This may be different from the bulk-gas flow; therefore, the critical gas saturations reported in a cited reference may be too low. (2) Material balance (based on the equilibrium criterion) should be used to calculate gas saturation and critical gas saturation. Supersaturation has a negligible effect on gas saturation. Propositions 1 and 2 are false, and they reject them unequivocally. In this response the authors briefly state the physical principles of gas evolution in porous media and discuss the invalidity of these propositions.

• OSTI ID: 6993098
• Journal Information: SPE Formation Evaluation (Society of Petroleum Engineers); (United States), Vol. 9:2; ISSN 0885-923X
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
NATURAL GAS
FLOW MODELS
RESERVOIR ROCK
FLUID FLOW
GAS SATURATION
BENCH-SCALE EXPERIMENTS
POROUS MATERIALS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
MATERIALS
MATHEMATICAL MODELS
SATURATION
030300* - Natural Gas- Drilling
Production
& Processing
033000 - Natural Gas- Properties & Composition