Systems and methods for determining grain density of an untreated rock sample using a gas porosimeter and nuclear magnetic resonance
AssigneeSaudi Arabian Oil Company
InventorsStacey M. Althaus, Jin-Hong Chen, Mohammed Boudjatit
Life of this patent
Estimating the term…
Abstract
Techniques for determining grain density of a rock sample include identifying an untreated rock sample that includes a solid matrix and a fluid entrained within the solid matrix; measuring, using a gas porosimeter, a grain density of the untreated rock sample; measuring, using nuclear magnetic resonance (NMR), a volume of the fluid entrained within the solid matrix; and determining, based on the measured grain density of the untreated rock sample and the measured volume of the fluid, a grain density of the solid matrix of the untreated rock sample.
Claims38
A method of determining grain density of a rock sample, comprising:
- (i) identifying an untreated rock sample that comprises a solid matrix and a fluid entrained within the solid matrix;
- (ii) measuring, using a gas porosimeter, a grain density of the untreated rock sample;
- (iii) measuring, using nuclear magnetic resonance (NMR), a volume of the fluid entrained within the solid matrix;
- and
- (iv) determining, based on the measured grain density of the untreated rock sample and the measured volume of the fluid, a grain density of the solid matrix of the untreated rock sample.
A system for determining grain density of a rock sample, comprising:
- a gas porosimeter configured to determine a grain density of an untreated rock sample that comprises a solid matrix and a fluid entrained within the solid matrix;
- a nuclear magnetic resonance (NMR) measurement device configured to determine one or more NMR measurements of the untreated rock sample;
- and
- a control system configured to perform operations comprising:
- identifying a measured grain density of the untreated rock sample from the gas porosimeter;
- determining a measured volume of the fluid entrained within the solid matrix from the one or more NMR measurements;
- and
- determining, based on the measured grain density of the untreated rock sample and the measured volume of the fluid, a grain density of the solid matrix of the untreated rock sample.
A computer-implemented method performed with a computing system that comprises one or more hardware processors, the method comprising:
- operating, with the one or more hardware processors, a gas porosimeter to measure a pressure of a pressurized gas in the gas porosimeter that encloses an untreated rock sample that comprises a solid matrix and a fluid entrained within the solid matrix;
- determining, with the one or more hardware processors, a value of a measurement of a grain density of the untreated rock sample based at least in part on the measured pressure of the pressurized gas;
- determining, with the one or more hardware processors, a value of a measurement of a volume taken by a nuclear magnetic resonance (NMR) device of the fluid entrained within the solid matrix;
- and
- determining, with the one or more hardware processors, a grain density of the solid matrix of the untreated rock sample based on the measured value of the grain density of the untreated rock sample and the measured value of the volume of the fluid.
Dependencies are inferred from the claim text.