000			02284nab a2200241 4500
005			20260520004411.0
008			260224s2012 xxu ing
041			_aInglés
245	0	0	_aWater Mixing During Waterflood Oil Recovery _bThe Effect of Initial Water Saturation
260			_a _b _cmar. 2012
270			_a03/12/2012 ; 03/12/2012
300			_a9 p. ; 43-52
520			_aTranscripción del resumen del autor This work studies the mixing of injected water and in-situ water during waterfloods and demonstrates that the mixing process is sensitive to the initial water saturation. The results illustrate differences between a waterflooded zone and a preflooded zone during, for example, water-based EOR displacement processes. The mixing of in-situ, or connate, water and injected water during laboratory waterfloods in a strongly water-wet chalk core sample was determined at different initial water saturations. Dynamic 1D fluid-saturation profiles were determined with nuclear-tracer imaging (NTI) during waterfloods, distinguishing between the oil phase, connate water, and injected water. The mixing of connate and injected water during waterfloods, with the presence of an oil phase, resulted in a displacement of all connate water from the core plug. During displacement, connate water banked in front of the injecting water, separating (or partially separating) the injected water from the mobile oil phase. This may impact the ability of chemicals dissolved in the injected water to contact the oil during secondary recovery and EOR processes. The effect of the connate-water-bank separation was sensitive to the initial water saturation Swi ). The time difference between breakthrough of connate water and breakthrough of injected water at the outlet showed a linear correlation to the initial water saturation (Swi ). The results obtained in chalk confirmed earlier findings in sandpacks (Brown 1957) and thus demonstrated the generality in the results.
581			_a1
773	0		_tSPE Journal _g17
942			_cARTICULO
100	1		_aGraue, Arne _952805
100	1		_aFerno, Martin A. _952806
100	1		_aMoe, Robert W. _952807
100	1		_aBaldwin, Bernard A. _952808
100	1		_aNeedham, Riley _952809
999			_c187472 _d187472