# US 2013/0152671 A1 · Capillary-Based Calibration Standards For Measurement of Permeability

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- Number: US 2013/0152671 A1
- Document ID: US20130152671A1
- Status: Published application
- Kind: A1
- Application number: 13/660,922
- Filed: 2012-10-25
- Published: 2013-06-20
- Earliest claimed: 2011-12-20
- Assignees: ExxonMobil Upstream Research Company
- Inventors: Somnath Sinha; Edward M. Braun; Quinn R. Passey; Sergio A. Leonardi; Alexander C. Wood, III; Timothy E. Zirkle; Ryan A. Kudva
- Web page: https://patentgrep.com/patent/US20130152671A1

## CPC

- G01N 15/0826: {and measuring fluid flow rate, i.e. permeation rate or pressure change}
- G01N 2001/2893: {Preparing calibration standards}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A calibration standard or check plug provides calibration standards in the permeability range of 10-10,000 nanoDarcy. The check plug is of similar exterior dimensions to a core sample that would be used with existing permeameters. The check plug is constructed from an impermeable material that is insensitive to moisture. The check plug has one or more channels of known diameter from which the permeability may be calculated. Methods for use thereof and methods of manufacture thereof are also disclosed.

## Claims

### Claim 1

A method of creating a check plug of known permeability comprising:
creating a cylinder with a diameter D with an impermeable matrix;
creating one or more channels in the cylinder,
wherein the channel has a known diameter d; and
calculating the permeability through the check plug by the equation
k
effective
=
nd
4
32

D
2
,
wherein n is the number of channels.

### Claim 2 (depends on 1)

The method of claim 1 wherein the diameter d of the one or more channels is less than 50 microns.

### Claim 3 (depends on 1)

The method of claim 1 wherein the diameter d of the one or more channels is within the range of 5-30 microns.

### Claim 4 (depends on 3)

The method of claim 3 wherein the creating one or more channels in the cylinder further comprises:
forming a passage in the cylinder;
attaching a glass capillary tube containing the channel within the passage,
wherein the glass capillary tube has a diameter d; and
sealing the annulus between the passage and the glass capillary tube.

### Claim 5 (depends on 3)

The method of claim 3 wherein the creating one or more channels in the cylinder further comprises micro fabrication techniques.

### Claim 6 (depends on 1)

The method of claim 1 wherein the diameter D of the cylinder is within a range of 0.5 to 4 inches.

### Claim 7 (depends on 1)

The method of claim 1 wherein the cylinder has a length within a range of 0.5 to 5 inches.

### Claim 8 (depends on 1)

The method of claim 1 wherein the impermeable matrix is a metal.

### Claim 9 (depends on 1)

The method of claim 1 wherein the impermeable matrix is a polymer.

### Claim 10 (depends on 1)

The method of claim 1 wherein the impermeable matrix is a material that is insensitive to humidity.

### Claim 11 (depends on 1)

The method of claim 1 wherein the impermeable matrix is a material whose permeability does not change in response to mechanical stress.

### Claim 12 (depends on 1)

The method of claim 1 wherein the calculated permeability is in a range of 10-10,000 nanoDarcy.

### Claim 13

A check plug of known permeability comprising:
a cylinder with a diameter D,
wherein the cylinder comprises an impermeable matrix;
one or more channels in the cylinder,
wherein the channel has a known diameter d; and
the permeability through the check plug is calculated by the equation
k
effective
=
nd
4
32

D
2
,
wherein n is the number of channels.

### Claim 14 (depends on 13)

The check plug of claim 13 wherein the diameter d of the one or more channels is less than 50 microns.

### Claim 15 (depends on 13)

The check plug of claim 13 wherein the diameter d of the one or more channels is within the range of 5-30 microns.

### Claim 16 (depends on 15)

The check plug of claim 15 wherein the creating one or more channels in the cylinder further comprises:
forming a passage in the cylinder;
attaching a glass capillary tube containing the channel within the passage,
wherein the glass capillary tube has a diameter d; and
sealing the annulus between the passage and the glass capillary tube.

### Claim 17 (depends on 15)

The check plug of claim 15 wherein the creating one or more channels in the cylinder further comprises micro fabrication techniques.

### Claim 18 (depends on 13)

The check plug of claim 13 wherein the diameter D of the cylinder is within a range of 0.5 to 4 inches.

### Claim 19 (depends on 13)

The check plug of claim 13 wherein the cylinder has a length within a range of 0.5 to 5 inches.

### Claim 20 (depends on 13)

The check plug of claim 13 wherein the impermeable matrix is a metal.

### Claim 21 (depends on 13)

The check plug of claim 13 wherein the impermeable matrix is a polymer.

### Claim 22 (depends on 13)

The check plug of claim 13 wherein the permeability does not change in response to humidity.

### Claim 23 (depends on 13)

The check plug of claim 13 wherein the permeability does not change in response to mechanical stress.

### Claim 24 (depends on 13)

The check plug of claim 13 wherein the calculated permeability is in a range of 10-10,000 nanoDarcy.

### Claim 25 (depends on 13)

The check plug of claim 13 wherein the permeability could be lowered to any number practically detectable by increasing the external diameter D of the plug.