| Due to the tiny size,nanoparticles have distinctive properties in terms of electrical conductivity,thermal conductivity and magnetic property,which traditional material is limited Based on above,nanoparticles have a broad prospect in the technology development and practical application of well logging.In order to improve the interpretation accuracy of intercommunicating porosity in formation by combining the traditional well logging and advanced Nano-science,this study set up several series of experiments to measure the properties of porous media with nanoparticles injection considering the context of nuclear magnetism and electrical conductivityThe experimental conductivity of deionized water based nanofluids has been measured in different controlling factors comprised of temperature,volume concentration,nanoparticle variety and particle size.Permeability in core flooding experiment is affected by the nanofluids concentration and injecting rate.The resistivity of porous media is measured with the influence of temperature,volume concentration,nanoparticle variety and particle size.The nuclear magnetic resonance relaxation time is measured under the influence of paramagnetic fluid concentration.The results are compared with scanning electron micrograph images and constant speed mercury injection data to explore the mechanism of nanometer fluid migration in porous media and to explain the nanoparticles' influence on electrical and nuclear magnetic characteristics of porous mediaWith the evidence of experimental results,all kinds of hydrophilic nanoparticles which used in this paper will not influence the resistivity logging under the low-concentration condition which is lower than 0.4%.Meanwhile,iron oxide nanoparticle has the capacity to improve the interpretation accuracy of nuclear magnetic logging to interconnected pores in complex porous formation.The threshold of interconnected pores could be adjusted by the diameter of nanoparticles ranging from tens to hundreds nanometer. |
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