Abstract: A method for monitoring the oleophilic fluid to aqueous fluid ratio of a drilling fluid includes selecting a sample of the drilling fluid that has been recirculated, measuring the NMR response of the sample of the drilling fluid and determining the oleophilic fluid to aqueous fluid ratio of the drilling fluid based at least in part on the NMR response.

Abstract: Various embodiments include a method for determining a viscosity for heavy oil in a formation by obtaining viscosity data and nuclear magnetic resonance (NMR) relaxation time distribution data for a plurality of oil samples. A correlation is determined between a set of viscosity data for the plurality of oil samples and an NMR relaxation time geometric mean for the plurality of oil samples. An NMR relaxation time geometric mean intrinsic value is determined based on the correlation, apparent hydrogen index, and TE. Electromagnetic energy may then be transmitted into a formation and NMR relaxation time distributions determined for oil in the formation based on secondary electromagnetic field responses associated with the electromagnetic energy. A viscosity of the oil in the formation may then be determined based a correlation between the set of viscosity data and the NMR relaxation time geometric mean intrinsic value of the distribution data.

Abstract: In some embodiments, an apparatus and a system, as well as a method and article of manufacture, may operate to measure nuclear magnetic resonance relaxation times in a fluid. Further activity may include determining a viscosity of the fluid based on at least one ratio of the relaxation times, and operating a controlled device based on the viscosity. Additional apparatus, systems, and methods are disclosed.

Abstract: In some embodiments, an apparatus and a system, as well as a method and article of manufacture, may operate to measure nuclear magnetic resonance relaxation times in a fluid. Further activity may include determining a viscosity of the fluid based on at least one ratio of the relaxation times, and operating a controlled device based on the viscosity. Additional apparatus, systems, and methods are disclosed.

Abstract: A method for monitoring the oleophilic fluid to aqueous fluid ratio of a drilling fluid includes selecting a sample of the drilling fluid that has been recirculated, measuring the NMR response of the sample of the drilling fluid and determining the oleophilic fluid to aqueous fluid ratio of the drilling fluid based at least in part on the NMR response.

Abstract: Analyzing crude oils and, more specifically, indirectly measuring asphaltene concentration in crude oils may be performed via nuclear magnetic resonance (NMR) techniques. For example, determining the asphaltene concentration of a crude oil sample having an unknown concentration of asphaltene and having the API gravity of about 20 to about 41 may be achieved by applying a measured NMR property of the unknown sample to a mathematical regression for asphaltene concentration in crude oil as a function of an NMR property according to the following equation where C is the asphaltene concentration, k is the Huggins constant that describes the solvent quality, [?] is the intrinsic viscosity.

Abstract: Systems, methods, and software for estimating the viscosity of a subterranean fluid based on NMR logging data are described. In some aspects, a viscosity model relates subterranean fluid viscosity to apparent hydrogen index. An apparent hydrogen index value for a subterranean region is computed based on nuclear magnetic resonance (NMR) logging data acquired from a subterranean region. A subterranean fluid viscosity value is computed for the subterranean region based on the viscosity model and the apparent hydrogen index value.