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A method for creating 3D printed cores representing a rock/formation

IP.com Disclosure Number: IPCOM000249039D
Publication Date: 2017-Jan-27
Document File: 6 page(s) / 677K

Publishing Venue

The IP.com Prior Art Database

Abstract

A method is disclosed for 3D printing rock cores with desired characteristics. Steps required to create such a specimen are described and few examples are provided. Creating synthetic rock cores can be useful in obtaining a medium with controlled physical properties that can be used for example for calibrating logging tools with respect to a known and controlled environment or even testing and validating particular petrophysical models or in case of lack of valid model investigating the significance of each petrophysical parameter and its sensitivity for a particular physical phenomenon.

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Title:   A method for creating 3D printed cores representing a rock/formation

Abstract:   A method is disclosed for 3D printing rock cores with desired characteristics. Steps required to create such a specimen are described and few examples are provided. Creating synthetic rock cores can be useful in obtaining a medium with controlled physical properties that can be used for example for calibrating logging tools with respect to a known and controlled environment or even testing and validating particular petrophysical models or in case of lack of valid model investigating the significance of each petrophysical parameter and its sensitivity for a particular physical phenomenon.

Description: 

 

1- A method to produce synthetic medium (e.g. a core) representing key features of a rock core in a controlled form

2- Using synthetic cores obtained from previous claim to test and validate performance of tools and test fixtures in a controlled environment. Examples include creating mediums for calibration of resistivity, dielectric, acoustic, NMR, fluid diffusivity and any other logging tools or sensors.

3- Using synthetic cores obtained from claim 1 to validate or develop new theoretical models and identify the key petrophysical parameters.

4- Using medium obtained from claim 1 to study the sensitivity of physical response of the medium to changes in structure of the rock (examples are aspect ratio of inclusions, anisotropic electromagnetic behavior of medium due to distribution of orientation of inclusions, layers or any feature representing a phase, effect of pore throat size distribution on NMR, effect of micro cracks on acoustic time delay and effect of tortuosity on fluid diffusivity.

5- Creating a replica of formation based on information from logging tool

Following example provides details on using the disclosed method in validating the effect of shapes and orientation of inclusions on electromagnetic properties of a medium.

Micro CT scans at different depth or surface pictures from electron microscopic images are used to obtain statistical distribution of orientation, size and shape of inclusions. Figure 1 shows a microstructure image taken from surface of a  sandstone using an electron microscope.

 

Figure 1. (Left) Micro structure of a sandstone, (Right) The same picture with estimation of size of principal axes of inclusions

A mathematical model representing the statistical distribution obtained in previous step is selected. A computer model generates realization of inclusions with orientation, size and shape using the probability distribution obtained in previous step. The size of medium is predetermined and the location of each inclusion can be either fixed or selected by a probability distribution. Size, shape and orientation are selected from a joint probability distribution obtained in previous step. The inclusions can have overlap due to proximity. In that case they would be emerged into one entity. The number of inclusions dep...