| Autor: |
Romero-Zerón, Laura, Kantzas, Apostolos |
| Předmět: |
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| Zdroj: |
SPE Reservoir Evaluation & Engineering; Apr2007, Vol. 10 Issue 2, p150-163, 14p, 2 Black and White Photographs, 4 Diagrams, 14 Graphs |
| Abstrakt: |
Excessive gas and/or water production is a common problem encountered throughout the lifetime of oil-producing wells. High-producing gas/oil or water/oil ratios are normally responsible for both rapid productivity decline and increased operating costs caused by gas or water processing. The result is often a premature shut-in of wells because production has become uneconomical. Foamed gels have been used as selective barriers to counteract disproportionate gas/oil and/or water/oil ratios in oil production. However, research on the effects of critical parameters such as wettability of the porous medium and pore geometry on foamed-gel-blockage performance remains incomplete. In this work, microscale experiments, which involve the magnified observation of flowing and trapped foamed gel in etched-glass micromodels, were performed. The purpose of this research is to provide new insights into the sensitivity of foamed-gel-blockage performance as a function of porous-media wettability (strongly water-wet or strongly oil-wet systems) and pore geometry. The experimental results indicate that foamed gels presented higher blocking efficiency in strongly oil-wet systems than in strongly water-wet systems. Under these experimental conditions, foamed gels exhibited higher blocking efficiency at lower pore-body-/pore-throat-size aspect ratios. The plugging treatment exhibited stability after subsequent steps of gas and brine injection. Ultimately, these results indicate that the combination of foam and gel systems has technical advantages that make foamed gels superior mobility-control and plugging agents. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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