Patent ID: 11933932
Assignee: VINEGAR TECHNOLOGIES LLC
Field: Measurement (Instruments)
Classification: CPC G  E | IPC E  G

Claim 16:
17. A method comprising performing NMR restricted diffusion measurements on a core with connate water present by:
a) pressure-saturating the core with two hydrocarbons (sequentially high-pressure methane and decane, or high-pressure methane and high-pressure butane),
b) measuring NMR restricted diffusion of the two hydrocarbons under pressure in the core to obtain their restricted diffusivity in the hydrocarbon-bearing porosity of the core,
c) estimating the tortuosity and surface-to-volume ratio of the hydrocarbon-filled pore space of the core, and
d) using the tortuosity, surface-to-volume ratio, and porosity occupied by the hydrocarbon fluids, and estimating the pore body-to-pore-throat ratio for the lithology, determining the permeability of the mobile hydrocarbons in the core.