Document Type

Article

Research Focus Area

Catalysis and Reaction Engineering, Computational Fluid Dynamics

Publication Date

7-6-2005

Journal or Book Title

Geophysical Research Letters

Volume

32

Issue

13

First Page

L13303

DOI

10.1029/2005GL023123

Abstract

Elastic waves have been observed to increase productivity of oil wells, although the reason for the vibratory mobilization of the residual organic fluids has remained unclear. Residual oil is entrapped as ganglia in pore constrictions because of resisting capillary forces. An external pressure gradient exceeding an ‘‘unplugging’’ threshold is needed to carry the ganglia through. The vibrations help overcome this resistance by adding an oscillatory inertial forcing to the external gradient; when the vibratory forcing acts along the gradient and the threshold is exceeded, instant ‘‘unplugging’’ occurs. The mobilization effect is proportional to the amplitude and inversely proportional to the frequency of vibrations. We observe this dependence in a laboratory experiment, in which residual saturation is created in a glass micromodel, and mobilization of the dyed organic ganglia is monitored using digital photography.We also directly demonstrate the release of an entrapped ganglion by vibrations in a computational fluid-dynamics simulation.

Comments

This article is from Geophysical Research Letters 32 (2005): L13303, doi:10.1029/2005GL023123. Posted with permission.

Copyright Owner

American Geophysical Union

Language

en

File Format

application-pdf

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