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The contact angle, interfacial tension and viscosity of reservoir fluids: experimental data and modelling
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The contact angle, interfacial tension and viscosity of reservoir fluids: experimental data and modelling
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Dissertation
The contact angle, interfacial tension and viscosity of reservoir fluids: experimental data and modelling
2000
Overview
Surface and viscous forces play a major role in the flow characteristics of fluids in petroleum reservoirs, hence, in the recovery of hydrocarbons. In reservoir engineering, surface forces are expressed by the interfacial tension (IFT) between different co-existing phases and the contact between the reservoir rock and in-situ fluids; whereas viscous forces are expressed by the viscosity of the flowing phases. The determination of these properties are essential in planning, management and operation of reservoirs for optimum recovery.Novel techniques based on the characteristics of gas-liquid interface have been developed and employed for measuring the liquid-vapour-solid contact angle and IFT of various binary and real reservoir fluids. The results show that the contact angle remains fairly constant for a wide range of IFT values and then decreases as the fluid approaches its critical region. A generalised correlation between the contact angle and IFT was developed and evaluated using the generated data.A systematic investigation of viscosity of pure compounds at various pressure and temperature levels indicated the need to include both structural and thermal effects for accurate viscosity prediction of dense fluids. A residual viscosity method has been modified to include the above effects and its reliability for calculating viscosity of mixtures has been demonstrated. Furthermore a model to predict the viscosity enhancement at near-critical conditions has been developed and tested against measured data at such conditions.A methodology has been developed to determine the viscosity and IFT of the original reservoir fluid from samples contaminated by drilling fluids. The method, which relies on retrieving the original fluid composition and fluid property predictive models, has been tested for a large number of volatile oil and gas condensate samples contaminated at different levels with satisfactory results.
Publisher
ProQuest Dissertations & Theses
Subject
