Method for measuring the diffusion coefficient of water within a porous medium by a nuclear magnetic resonance method

Patent metadata

Field	Value
Publication number	US-2020116616-A1
Application number	US-201816621587-A
Country	US
Kind code	A1
Filing date	May 15, 2018
Priority date	Jun 19, 2017
Publication date	Apr 16, 2020
Grant date	—

Abstract

The present invention relates to a method of measuring the diffusion coefficient of water in a porous medium, wherein the coefficient is measured using a nuclear magnetic resonance (NMR) technique (2, 3, 4) and wherein the sample (1) has the shape of a hollow cylinder.

First claim

1 .- 10 . (canceled)

11 . A method of measuring a diffusion coefficient of water in a porous medium, comprising:
a) preparing a sample of the porous medium in a hollow cylinder; b) saturating the sample of the porous medium with water; c) immersing the water-saturated sample of the porous medium in a water-miscible tracer fluid which is not detectable by a Nuclear Magnetic Resonance NMR method; d) measuring the water concentration in the sample using a Nuclear Magnetic Resonance NMR method; and e) determining the water diffusion coefficient in the porous medium by use of the measured water concentration in the sample, by accounting for the hollow cylinder shape of the sample of the porous medium.

12 . A method as claimed in claim 11 , wherein the porous medium is one of a cement paste, concrete or rock.

13 . A method as claimed in claim 12 , wherein the concrete contains aggregates which are millimeters in size.

14 . A method as claimed in claim 11 , wherein an outside diameter of the hollow cylinder ranges between 20 and 80 mm, and an inside diameter of the hollow cylinder ranges between 2 and 25 mm.

15 . A method as claimed in claim 12 , wherein an outside diameter of the hollow cylinder ranges between 20 and 80 mm, and an inside diameter of the hollow cylinder ranges between 2 and 25 mm.

16 . A method as claimed in claim 13 , wherein an outside diameter of the hollow cylinder ranges between 20 and 80 mm, and an inside diameter of the hollow cylinder ranges between 2 and 25 mm.

17 . A method as claimed in claim 11 , wherein the tracer fluid which is not detectable by a Nuclear Magnetic Resonance NMR method is deuterium.

18 . A method as claimed in claim 12 , wherein the tracer fluid which is not detectable by a Nuclear Magnetic Resonance NMR method is deuterium.

19 . A method as claimed in claim 14 , wherein the tracer fluid which is not detectable by a Nuclear Magnetic Resonance NMR method is deuterium.

20 . A method as claimed in claim 11 , comprising:
double coring the porous medium.

21 . A method as claimed in claim 12 , comprising:
double coring the porous medium.

22 . A method as claimed in claim 14 , comprising:
double coring the porous medium.

23 . A method as claimed in claim 17 , comprising:
double coring the porous medium.

24 . A method as claimed in claim 11 , wherein the diffusion coefficient D p of the water in the porous medium is determined by means of a formula:

C
*

=

C

p



s



C
cylcreux

with

C

p



s

=

∑

n
=
0

∞



8

(

2

n

+
1

)

2



π
2



exp


(

-

D
p



(

2

n

+
1

)

2



π
2



t

4




l
2

)

,



C
cylcreux

=

4

b
2

-

a
2



∑

n
=
0

∞



J
0



(

ak
n

Assignees

• Ifp Energies Now

Inventors

• Fleury Marc

Classifications

• G01R33/44

  using nuclear magnetic resonance [NMR] (G01R33/24, G01R33/62 take precedence) · CPC title

• G01N24/081

  Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity · CPC title

• G01N2013/003

  Diffusion; diffusivity between liquids · CPC title

• G01N13/00 Primary

  Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects (scanning-probe techniques or apparatus G01Q) · CPC title

• G01N33/383

  Concrete or cement · CPC title