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To test the future reality of having molecular devices in the reservoir, we embarked on a research initiative to run core-flooding experiments on carbonate samples from ARAB-D formations using inert nanoparticle suspensions. This was aimed also to set the stage for injecting traceable nanoparticles into the rock. Broadly, the study intendedto generate baseline data for tile injection response of nanoparticles in the carbonate bimodal samples and correlate the impact on the rock permeability and the particle transport efficiency in terms of particle size, concentration, and surface chemistry.
Nanofluid technology promises large-scale performance gains from tight reservoirsThe underlying concept that allows nanofluids to remove fluids from a reservoir with such a high level of efficiency is called disjoining pressure, Due to their extremely small size, the nanofluid's particles can easily move into very tight formations, which have porosities in the microdarcy range, without the need for an external pumping force. When they come into contact with a discontinuous phase, such as an oil-rock interface, these particles self assemble to form a thin film known as a wedge layer. This wedge film then exerts a pressure on the discontinuous phase, called a disjoining pressure, which effectively works to separate the oil from the rock surface and carry it out of the rock pore. 2011
Design and Application of Novel Nano Drilling Fluids to Mitigate Circulation Loss Problems during Oil Well Drilling OperationsThe research also aimed at developing a new class of highly specialized nanoparticle based drilling fluids with superior ability to plug the pore throat of the formation and prevent fluid loss while drilling. Application of nano calcium carbonate and nano iron hydroxide were considered in the drilling fluid to fill the gaps between larger particles forming the plug. Nano materials are capable of reducing the permeability and the porosity of the media and increase its yield point and mechanical strength. Filtration and Rheology tests performed on nano-fluids unveiled the significant capabilities of nano calcium carbonate to increase the consistency and sealing capabilities of the filter cakes. University of Calgary, CA