000			02387nab a2200229 4500
005			20260520003059.0
008			260224s2012 xxu ing
041			_aInglés
245	0	0	_aAxisymmetric Drainage in Hydrophobic Porous Media Micromodels
260			_a _b _cnov./dic. 2012
270			_a07/05/2013 ; 03/05/2013
300			_a9 p. ; 953-962
520			_aTraducción del resúmen del autor: We present studies of axisymmetric drainage in two-dimensional micromodels of porous media using up to date microfabrication and image analysis methods. Drainage of model oil by aqueous solutions is studied at low capillary numbers (Ca) typically encountered during oil recovery operations. We use two types of oil-wet micromodels: one is based on a deposition method for creating a random monolayer of micronic glass beads, while the other is made using computer generated random networks etched in glass using wet-lithography. Both models have a central injection scheme and a radial geometry, resulting in a continuous variation of the capillary number during the course of drainage. We first carry out an analysis of experiments at global micromodel scale using computer based image analysis coupled with flow rates and pressure drop measurements. Basic relevant parameters such as permeability, porosity of the micromodel and residual oil in place after waterflooding are extracted. We then take advantage of the ease of observation in transparent micromodels to investigate the drainage phenomenon at local scale. Local saturation and front width are measured as a function of the local capillary number. Interestingly, because of the radial flow geometry, our experiments allow a continuous plotting of the micromodels capillary desaturation curve on several decades. As expected but never precisely observed, all points of various experiments collapse on a single capillary desaturation curve for a given micromodel. However, we observe dissimilar behaviors between the two types of micromodels. We discuss this phenomenon in light of the pore scale geometrical differences between the two models.
581			_a6
773	0		_tOil and Gas Science and Technology _g67
942			_cARTICULO
100	1		_aCuenca, A. _953098
100	1		_aChabert, M. _953099
100	1		_aMorvan, M. _951351
100	1		_aBodiguel, H. _953100
999			_c187654 _d187654