Importance of Relative Permeability - PDF
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Added on 2021-04-17
Importance of Relative Permeability - PDF
Added on 2021-04-17
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RELATIVE PERMEABITYImportance of relative permeabilityIn hydrocarbon reservoirs, the flow of fluids involves multi-fluids, each of which has its ownpermeability. The permeability of a particular fluid is minimized by the presence of the otherliquids and or gases in the voids. The flow of the multi-phased system is best described usingrelative permeability; relative permeability described as the ratio of effective permeability of afluid to the absolute permeability of a rock.kri=kikRelative permeability is depended on by water breakthrough. In heavy oil production, waterbreakthrough is a huge challenge which causes increased water cut during the productionprocess. However, if water breakthrough is delayed, it increases the volume of pure oilsproduced and also reduces the operational and maintenance costs (Ediriweera & Halvorsen,2015). Therefore, manipulating relative permeability; through oil recovery methods; will delaywater break through.Measurement of relativity permeabilityRelative permeability can be determined using laboratory techniques; steady and unsteady statetechniques; and also, empirical techniques and also calculations from field data (Honarpour &Mahmood, 1988).The steady state system utilizes Darcy's law and gives the most dependable relative permeabilitydata ("5. Measurement of Relative Permeability | Global CCS Institute", 2018). In this strategy, afew fluids are injected at the same time at the same rates or pressure for stretched out spans toachieve equilibrium. Parameters such as flow rates, saturation, pressure are estimated andutilized as a part of Darcy's law to acquire the effective permeability for every stage and in thusrelative permeability. Changes in saturation are controlled to be unidirectional (i.e., imbibition ordrainage) so that hysteresis can be prevented.Unsteady-State Techniques maybe the fastest strategies for getting relative permeability in thelaboratory. In these procedures, saturation equilibrium isn't accomplished; hence, a batch ofrelative-permeability versus saturation curves can be acquired within a couple of hours.Typically, it includes displacing on site fluids by constant-rate or pressure, then a driving fluid isinjected while observing the effluent volumes consistently. Analysis of the production data isdone; a set of relative-permeability curves is obtained using various mathematical methods.Experimental Technique models are now and then used to estimate relative permeability due tothe huddles involved in measurement. Limited laboratory data may be extrapolated using thesemodels. The porous medium h’s been idealized as a bundle of capillaries in several proposedpredictive models. The flow via a single capillary is portrayed numerically, thereafter, thevolume through the entire set of capillaries is obtained using the idea of capillary pressure.Mathematical methods have likewise been utilized to portray irregularity of pore-sizedistribution in a porous media.1
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