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

Claim 0:
1. A method of mapping, in at least a vertical direction, subsurface permeability as a function of downhole-location, the method comprising:
a. acquiring a set CORE_SET of N core samples {CS1, CS2 . . . CSN} where CSi is the ith core sample, and N is a positive integer, and 1≤i≤N, wherein each core-sample CSi is extracted from a respective downhole extraction-location EXTRACTION-LOC(CSi) within the subsurface;
b. for each core sample CSi of CORE_SET, respectively performing the following set of measurements:
(i) a respective lab-NMR measurement of a respective porosity ϕM(CSi) describing the porosity of movable hydrocarbons;
(ii) a respective lab-NMR measurement of one or more pore-dimension properties; and
(iii) a respective lab measurement of the permeability k(CSi) of the core sample CSi;

c. for each core sample CSi of CORE_SET, estimating a respective downhole hydraulic tortuosity τhy(EXTRACTION-LOC(CSi)) representing the downhole tortuosity at the extraction-location from which core sample CSi was extracted;
d. computing, from the results of steps (b) and (c), an at least 1-D BTR-map of subsurface BTR (body throat ratio) as a function of subsurface location;
e. for a plurality of downhole locations, downhole-NMR-logging the following parameters: (i) subsurface porosity; and (ii) a subsurface pore-size parameter;
f. computing an at least 1-D map of subsurface permeability as a function of downhole-location from all of the following: (i) the at least 1-D BTR-map; (ii) the results of the downhole-NMR-logging; and (iii) the results of step (c).