Methods of NMR measurement of crushed porous media
AssigneeGreen Imaging Technologies, Inc.
InventorsMichael J. Dick, Derrick P. Green, Dragan Veselinovic, Taylor Kenney
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Abstract
A method of measuring petrophysical information from a crushed porous media including performing one or more NMR measurements on the porous media fully submerged in an NMR visible fluid, performing one or more NMR measurements on the porous media alone following centrifugation, performing one or more NMR measurements on the porous media after rinsing with a NMR invisible fluid, and analyzing the NMR measurements to extract a petrophysical property.
Claims32
A method of extracting a petrophysical property of crushed porous media comprising:
- filling an NMR invisible sample vessel to a given level with an NMR visible fluid, performing an NMR measurement of the NMR visible fluid in the vessel to measure a storage volume of the vessel,
- placing the crushed porous media inside the vessel having the NMR visible fluid such that the crushed porous media is submerged in the NMR visible fluid in the vessel,
- performing one or more NMR measurements on the NMR visible fluid and the crushed porous media submerged in the NMR visible fluid in the vessel,
- removing the NMR visible fluid from the vessel and from outer surfaces of the crushed porpous media,
- rinsing the crushed porous media in the vessel with an NMR invisible fluid, wherein the NMR invisible fluid helps remove any remaining of the NMR visible fluid from the vessel and from the outer surfaces of the crushed porous media,
- performing one or more NMR measurements on the crushed porous media in the vessel with the NMR visible fluid already removed from the vessel and from the outer surfaces of the crushed porous media, and
- analyzing the NMR measurements to extract a petrophysical property of the crushed porous media.
A method for determining a petrophysical property of a crushed porous media sample, where the crushed porous media sample is at least as large as a pore size of the porous media, comprising:
- providing an NMR invisible sample vessel of a known volume,
- placing the sample in the sample vessel and saturating the sample with a first fluid,
- measuring the volume of the sample and the first fluid by an NMR scan, removing the first fluid from the sample vessel,
- subjecting the sample in the sample vessel to a centrifugal force,
- adding a second fluid to the sample vessel and subjecting the second fluid and sample to a centrifugal force,
- measuring the volume of the first fluid still inside the pores of the sample by an NMR scan following the centrifugation, and
- determining the petrophysical property of the sample using the known volume of the sample vessel, the measured volume of the sample and the first fluid and the measured volume of the the first fluid still inside the pores.
Dependencies are inferred from the claim text.