Patent ID: 11921069
Assignee: VINEGAR TECHNOLOGIES LLC
Field: Measurement (Instruments)
Classification: CPC G  E | IPC E  G

Claim 0:
1. A method of determining, for each of three different fluid phases (water, oil and gas), a set of one or more fluid-phase-specific petrophysical properties (FPS-PP) of geological core where FPS-PPWATER is the FPS-PP for the water phase, FPS-PPOIL is the FPS-PP for the oil phase, FPS-PPGAS is the FPS-PP for the gas phase, where the FPS-PP is selected from a FPS-PP group which is defined below, the method comprising:
a. subjecting the geological core to NMR restricted diffusion measurements for multiple NMR active nuclei with at least two different hydrocarbons for at least the oil and gas phases, and
b. centrifuging the geological core over multiple drainage or imbibition cycles so as to produce effluent from the geological core;
c. as the geological core is centrifuged, measuring a time dependence of a flow rate of effluent from the geological core;
d. computing, from results of the NMR restricted diffusion measurements and from the time dependence of the flow rate of effluent, all of (i) FPS-PPWATER, (ii) FPS-PPOIL and (iii) FPS-PPGAS, wherein the FPS-PP group is defined as the group consisting of: (A) a fluid-phase-specific tortuosity value; (B) a fluid-phase-specific porosity value, the fluid-phase-specific porosity being defined as a fraction of a total pore volume which is occupied by a specific phase (oil, water or gas); (C) a fluid-specific-phase pore diameter, the fluid-specific-phase pore diameter being defined as a pore diameter which is occupied by the specific phase (oil, water, or gas); (D) a fluid-phase-specific body-to-throat ratio, the fluid-phase-specific body-to-throat ratio being defined as a body-to-throat ratio of respective throat and pore volumes which are occupied by the specific phase (oil, water or gas); (E) a fluid-phase-specific permeability, the fluid-phase-specific permeability being defined as the permeability of a specific phase (oil, water, or gas); (F) a fluid-phase-specific relative permeability curve for two specific phases.