By trapping gas, foam can improve the sweep efficiency in enhanced oil recovery. In this study, to understand gas trapping in fractures, we have conducted experiments in a model fracture with a hydraulic aperture of 80 μm. One wall of the fracture is rough, and the other wall is smooth. The fracture is made of two glass plates and the direct visualization of foam flow inside the fracture is facilitated using a high-speed camera. ImageJ has been used to perform image analysis and quantify the properties of the foam. We find that pre-generated foam has been further refined inside the model. Foam flow reaches local equilibrium, where the rate of bubble generation equals that of bubble destruction, within the model. Foam texture becomes finer and less gas is trapped as the interstitial velocity and pressure gradient increase. Shear-thinning rheology of foam has also been observed. The behavior of gas trapping in our model fracture is different from that in other geological porous media. The fraction of trapped gas is much lower (less than 7%). At the extreme, when velocity increases to 6.8 mm/s (pressure gradient to 1.8 bar/m), all the foam bubbles are flowing and there is no gas trapped inside the fracture.
|Title of host publication||IOR 2021 - 21st European Symposium on Improved Oil Recovery|
|Subtitle of host publication||21st European Symposium on Improved Oil Recovery, 19-22 April 2021, Online Event|
|Number of pages||10|
|Publication status||Published - 2021|
|Event||21st European Symposium on Improved Oil Recovery: Sustainable Ways to Maximize Recovery - Online event|
Duration: 19 Apr 2021 → 22 Apr 2021
|Conference||21st European Symposium on Improved Oil Recovery|
|Abbreviated title||IOR 2021|
|Period||19/04/21 → 22/04/21|
Bibliographical noteGreen Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
- Gas trapping
- Foam EOR
- Foam mobility