Systems and methods for determining mechanical properties of materials using SENB testing

Patent metadata

Field	Value
Publication number	US-11669659-B2
Application number	US-201916667097-A
Country	US
Kind code	B2
Filing date	Oct 29, 2019
Priority date	Oct 29, 2019
Publication date	Jun 6, 2023
Grant date	Jun 6, 2023

Abstract

Systems and methods for determining mechanical properties of formation rock using, for example, millimeter-scale test samples of the formation rock are disclosed. The test samples may be single edge notched beam (SENB) test samples. The systems and methods may include performing laboratory testing on the SENB test samples and recording laboratory testing data obtained from the laboratory testing and performing a simulation on a numerical model of the SENB test samples and recording the simulation data obtained from the simulation. The laboratory testing data and the simulation data may be compared, and a determination may be made as to whether a selected degree of correlation is present between the laboratory testing data and the simulation exists. Mechanical properties of the formation rock are obtained from the simulation data when the selected degree of correlation exists between the laboratory testing data and the simulation data.

First claim

What is claimed is:

1. A computer-implemented method, comprising:
performing laboratory testing of at least two single edge notched beam (SENB) test samples formed from formation rock by:
loading a first SENB test sample of the at least two SENB test samples in a direction perpendicular to one or more bedding layers of the formation rock of the first SENB test sample, and
loading a second SENB test sample of the at least two SENB test samples in a direction parallel to one or more bedding layers of the formation rock of the second SENB test sample;

recording laboratory testing data obtained from the laboratory testing;
for each SENB test sample of the at least two SENB test samples:
determining one or more elastic parameters of a material representing the formation rock by performing a first set of one or more simulations on a numerical model corresponding to the respective SENB test sample and determining when a first variance between a linear-elastic segment of a load-displacement curve generated from simulation data of the first set of one or more simulations and a linear-elastic segment of a load-displacement curve generated from the laboratory testing data is within a first predetermined level or correlation;
determining an ultimate tensile strength of the material representing the formation rock by estimating an ultimate tensile strength of the material representing the formation rock based on a peak load of the laboratory testing data, performing a second set of one or more simulations on the numerical model corresponding to the respective SENB test sample using the determined one or more elastic parameters, and determining when a second variance between a peak of a load-displacement curve generated from simulation data of the second set of one or more simulations and a peak of the load-displacement curve generated from the laboratory testing data is within a second predetermined level or correlation; and
determining one or more plastic parameters of the material representing the formation rock by performing a third set of one or more simulations on the numerical model corresponding to the respective SENB test sample using the determined one or more elastic parameters and the determined ultimate tensile strength, and determining when a third variance between a crack-propagation segment of a load-displacement curve generated from simulation data of the third set of one or more simulations and a crack-propagation segment of the load-displacement curve generated from the laboratory testing data is within a third predetermined level or correlation;

wherein the determined one or more elastic parameters, the determined ultimate tensile strength, and the determined one or more plastic parameters for the at least two SENB test samples represent linear-elastic behavior, peak loading behavior, and crack-propagation behavior of the formation rock for both perpendicular loading and parallel loading of the formation rock.

2. The computer-implemented method of claim 1 , further comprising forming the at least two SENB test samples as millimeter-scale test samples from drill cuttings of the formation rock.

3. A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations comprising:
performing laboratory testing of at least two single edge notched beam (SENB) test samples formed from formation rock by:
loading a first SENB test sample of the at least two SENB test samples in a direction perpendicular to one or more bedding layers of the formation rock of the first SENB test sample, and
loading a second SENB test sample of the at least two SENB test samples in a direction parallel to one or more bedding layers of the formation rock of the second SENB test sample;

recording laboratory testing data obtained from the laboratory testing;
for each SENB test sample of the at least two SENB test samples:
determining one or more elastic parameters of a material representing the formation rock by performing a first set of one or more simulations on a numerical model corresponding to the respective SENB test sample and determining when a first variance between a linear-elastic segment of a load-displacement curve generated from simulation data of the first set of one or more simulations and a linear-elastic segment of a load-displacement curve generated from the laboratory testing data is within a first predetermined level or correlation;
determining an ultimate tensile strength of the material representing the formation rock by estimating an ultimate tensile strength of the material representing the formation rock based on a peak load of the laboratory testing data, performing a second set of one or more simulations on the numerical model corresponding to the respective SENB test sample using the determined one or more elastic parameters, and determining when a second variance between a peak of a load-displacement curve generated from simulation data of the second set of one or more simulations and a peak of the load-displacement curve generated from the laboratory testing data is within a second predetermined level or correlation; and
determining one or more plastic parameters of the material representing the formation rock by performing a third set of one or more simulations on the numerical model corresponding to the respective SENB test sample using the determined one or more elastic parameters and the determined ultimate tensile strength, and determining when a third variance between a crack-propagation segment of a load-displacement curve generated from simulation data of the third set of one or more simulations and a crack-propagation segment of the load-displacement curve generated from the laboratory testing data is within a third predetermined level or correlation;

wherein the determined one or more elastic parameters, the determined ultimate tensile strength, and the determined one or more plastic parameters for the at least two SENB test samples represent linear-elastic behavior, peak loading behavior, and crack-propagation behavior of the formation rock for both perpendicular loading and parallel loading of the formation rock.

4. The non-transitory, computer-readable medium of claim 3 , further comprising forming the at least two SENB test samples as millimeter-scale test samples from drill cuttings of the formation rock.

5. A computer-implemented system, comprising:
one or more processors; and
a non-transitory computer-readable storage medium coupled to the one or more processors and storing programming instructions for execution by the one or more processors, the programming instructions instructing the one or more processors to:
perform laboratory testing of at least two single edge notched beam (SENB) test samples formed from formation rock by:
loading a first SENB test sample of the at least two SENB test samples in a direction perpendicular to one or more bedding layers of the formation rock of the first SENB test sample, and
loading a second SENB test sample of the at least two SENB test samples in a direction parallel to one or more bedding layers of the formation rock of the second SENB test sample;

record laboratory testing data obtained from the laboratory testing;
for each SENB test sample of the at least two SENB test samples:
determining one or more elastic parameters of a material representing the formation rock by performing a first set of one or more simulations on a numerical model corresponding to the respective SENB test sample and determining when a first variance between a linear-elastic segment of a load-displacement curve generated from simulation data of the first set of one or more simulations and a linear-elastic segment of a load-displacement curve generated from the laboratory testing data is within a first pr

Assignees

• Saudi Arabian Oil Co

Inventors

• Han Yanhui
• Haque Mohammad Hamidul
• Fan Ming
• Abousleiman Younane N

Classifications

• G01N2203/027

  Specimens with holes or notches · CPC title

• G06F30/17

  Mechanical parametric or variational design · CPC title

• G01N2203/0066

  Propagation of crack · CPC title

• G01M5/005

  by means of external apparatus, e.g. test benches or portable test systems · CPC title

• G01N3/40

  Investigating hardness or rebound hardness · CPC title