Calibrating electromagnetic corrosion detection tools via core saturation

Patent metadata

Field	Value
Publication number	US-12448880-B2
Application number	US-202217723241-A
Country	US
Kind code	B2
Filing date	Apr 18, 2022
Priority date	Jun 8, 2017
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

Methods and devices used to calibrate EM corrosion detection tools may estimate the effects of the presence of a core on measurements to enable more accurate corrosion detection in the well line. The methods may involve sending voltages to a core of a well tool disposed in the well line to obtain signals while the core is in a saturated and unsaturated state. Subsequent measurements using the core may be calibrated using a constant resulting from the division of the signals achieved at the core in the saturated and unsaturated states.

First claim

What is claimed is:

1. An electromagnetic detection system for a well tool, comprising:
a saturable magnetic core;
at least one transmitter coil disposed around the saturable magnetic core; and
at least one receiver coil spaced apart a predefined distance from the at least one transmitter coil.

2. The electromagnetic detection system for a well tool of claim 1 , further comprising a first power source coupled to the well tool and connected to saturate the saturable magnetic core.

3. The electromagnetic detection system for a well tool of claim 2 , further comprising a second power source coupled to the well tool and connected to demagnetize the saturable magnetic core.

4. The electromagnetic detection system for a well tool according to claim 1 , wherein the at least one transmitter coil and the at least one receiver coil are separate coils.

5. The electromagnetic detection system for a well tool according to claim 1 , wherein the at least one transmitter coil circumscribes the at least one receiver coil.

6. The electromagnetic detection system for a well tool according to claim 1 , wherein the at least one receiver coil is disposed around the saturable magnetic core.

7. The electromagnetic detection system for a well tool according to claim 1 , further including a computer-readable medium coupled with the saturable magnetic core, the computer-readable medium having a calibration coefficient stored therein resulting from at least one measurement obtained using the well tool with the saturable magnetic core.

8. The electromagnetic detection system for a well tool according to claim 1 , wherein the saturable magnetic core may be cylindrical in shape.

9. The electromagnetic detection system for a well tool of claim 3 , wherein the saturable magnetic core is coupled in series to both the first power source and the second power source.

10. A well tool having an electromagnetic detection system according to claim 1 , the well tool configured to log at least one first signal while a first voltage is applied to the saturable magnetic core and log at least one second signal while the first voltage is removed from the saturable magnetic core, wherein at least one measurement made by the well tool is calibrated using both the first signal and the second signal.

11. The well tool of claim 10 , wherein the at least one measurement is calibrated by taking a product of the at least one measurement and one or more of the at least one first signal divided by one or more of the at least one second signal.

12. The electromagnetic detection system for a well tool of claim 1 , wherein the at least one receiver coil spaced apart a predefined distance from the at least one transmitter coil is a first receiver coil spaced a predefined first distance from the at least one transmitter coil, and further including a second receiver coil spaced apart a predefined second different distance from the at least one transmitter coil.

13. The electromagnetic detection system for a well tool of claim 12 , wherein the predefined distance is 15 inches.

14. The electromagnetic detection system for a well tool of claim 13 , wherein the predefined second distance is 22 inches.

15. The electromagnetic detection system for a well tool of claim 12 , further including a third receiver coil spaced apart a predefined third different distance from the at least one transmitter coil.

16. The electromagnetic detection system for a well tool of claim 15 , wherein the predefined distance is 15 inches, the predefined second distance is 22 inches, and the predefined third distance is 30 inches.

17. The electromagnetic detection system for a well tool of claim 1 , wherein the saturable magnetic coil has a relative permeability of 70.

18. The electromagnetic detection system for a well tool of claim 1 , wherein the saturable magnetic coil has a conductivity of 0.01 S/m.

Assignees

• Halliburton Energy Services Inc

Inventors

• Donderici Burkay
• Fouda Ahmed E

Classifications

• G01N17/04

  Corrosion probes · CPC title

• G01N27/90

  using eddy currents · CPC title

• G01V13/00 Primary

  Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups G01V1/00 – G01V11/00 · CPC title

• G01N17/006 Primary

  of metals · CPC title

• E21B47/006 Primary

  Detection of corrosion or deposition of substances · CPC title