US 11,965,844 B2 · Methods and systems for characterizing a porous rock sample employing combined capillary pressure and NMR measurements

Abstract

A method (and corresponding system) that characterizes a porous rock sample is provided, which involves subjecting the porous rock sample to an applied experimental pressure where a first fluid that saturates the porous rock sample is displaced by a second fluid, and subsequently applying an NMR pulse sequence to the rock sample, detecting resulting NMR signals, and generating and storing NMR data representative of the detected NMR signals. The application of experimental pressure and NMR measurements can be repeated over varying applied experimental pressure to obtain NMR data associated with varying applied experimental pressure values. The NMR data can be processed using inversion to obtain a probability distribution function of capillary pressure values as a function of NMR property values. The probability distribution function of capillary pressure values as a function of NMR property values can be processed to determine at least one parameter indicative of the porous rock sample.

Claims20

Dependent claims

A method of characterizing a porous rock sample, comprising:

i) subjecting the porous rock sample to an applied experimental pressure where a first fluid that saturates the porous rock sample is displaced by a second fluid;
and
ii) subsequent to the operations of i), applying an NMR pulse sequence to the porous rock sample, detecting resulting NMR signals from the porous rock sample, and generating and storing NMR data representative of the detected resulting NMR signals;
iii) repeating the operations of i) and ii) over varying applied experimental pressure to obtain NMR data associated with varying applied experimental pressure values;
iv) processing the NMR data associated with varying applied experimental pressures of iii) to obtain a probability distribution function of capillary pressure values as a function of NMR property values;
and
v) processing the probability distribution function of capillary pressure values as a function of NMR properties values of iv) to determine at least one parameter indicative of the porous rock sample.

4 more elements

Dependencies are inferred from the claim text.

Methods and systems for characterizing a porous rock sample employing combined capillary pressure and NMR measurements

Life of this patent

Methods and systems for characterizing a porous rock sample employing combined capillary pressure and NMR measurements

Life of this patent

Abstract

Claims20