Application of electrochemical impedance spectroscopy for analyzing sag of drilling fluids

Patent metadata

Field	Value
Publication number	US-11143024-B2
Application number	US-201716606361-A
Country	US
Kind code	B2
Filing date	Dec 21, 2017
Priority date	Dec 21, 2017
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

Systems and methods for determining the composition of a drilling fluid using electro-rheology may be provided. A method for drilling a wellbore may include: circulating a drilling fluid in a wellbore; extending the wellbore into one or more subterranean formations; measuring impedance of at least a portion of the drilling fluid over time as one or more particulate additives in the drilling fluid settle; determining one or more model elements of an equivalent circuit model for modeling frequency responses of the drilling fluid from the impedance; and determining sag behavior of the drilling fluid based, at least partially, on the one or more model elements.

First claim

What is claimed is:

1. A method for drilling a wellbore comprising:
circulating a drilling fluid in a wellbore;
extending the wellbore into one or more subterranean formations;
measuring impedance of at least a portion of the drilling fluid over time as one or more particulate additives in the drilling fluid settle;
determining one or more model elements of an equivalent circuit model for modeling frequency responses of the drilling fluid from the impedance; and
determining sag behavior of the drilling fluid based, at least partially, on the one or more model elements.

2. The method of claim 1 , wherein the measuring the impedance of the portion of the drilling fluid comprises controlling temperature of the drilling fluid.

3. The method of claim 1 , wherein the measuring the impedance of the portion of the drilling fluid comprises placing the portion in a probe comprising an outer container and an inner container, the portion being disposed in a gap between the outer container and the inner container.

4. The method of claim 1 , wherein the equivalent circuit model comprises a first capacitor C 1 , a second capacitor C 2 , a resistor R 1 , a first constant phase element CPE 1 , and a first constant phase element CPE 2 , and wherein an equivalent circuit impedance (Zeq) is given by:

Z
eq

⁡

(
ω
)

=

Z

CPE
⁢

⁢
1

⁡

(
ω
)

+

Z

R
⁢
1

⁢

Z

C
⁢
1

⁡

(
ω
)

⁢

(

Z

C
⁢
2

⁡

(
ω
)

+

Z

CPE
⁢

⁢
2

⁡

(
ω
)

)

Z

C
⁢
1

⁡

(
ω
)

⁢

(

Z

C
⁢
2

⁡

(
ω
)

+

Z

CPE
⁢

⁢
2

⁡

(
ω
)

)

+

Z

R
⁢
1

⁡

(

Z

C
⁢
1

⁡

(
ω
)

+

Z

C
⁢
2

⁡

(
ω
)

+

Z

CPE
⁢

⁢
2

Assignees

• Halliburton Energy Services Inc

Inventors

• Ye Xiangnan
• Jamison Dale E
• Gao Li

Classifications

• G01N33/2823

  Raw oil, drilling fluid or polyphasic mixtures · CPC title

• E21B47/18

  through the well fluid {, e.g. mud pressure pulse telemetry} · CPC title

• G01N27/026

  Dielectric impedance spectroscopy (electrochemical impedance spectroscopy for measuring corrosion G01N17/02) · CPC title

• E21B49/005 Primary

  Testing the nature of borehole walls or the formation by using drilling mud or cutting data · CPC title

• E21B47/113

  using electrical indications; using light radiations · CPC title