Methods of drilling with resistivity tools

Patent metadata

Field	Value
Publication number	US-11280184-B2
Application number	US-201716099160-A
Country	US
Kind code	B2
Filing date	May 3, 2017
Priority date	May 3, 2016
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

A method of electrically logging a section of a wellbore includes circulating an oil-based wellbore fluid comprising a conductive carbon material therein, the oil-based wellbore fluid having a conductivity of at most 0.01 S/m when measured at 20 kHz, within the wellbore while drilling the wellbore with a drill bit on a drill string; applying electrical current from a logging tool on the drill string above the drill bit; and collecting an electrical log of the portion of the wellbore that has had electrical current applied thereto.

First claim

What is claimed is:

1. A method of electrically logging a section of a wellbore, comprising:
circulating an oil-based wellbore fluid comprising a conductive carbon material therein, the oil-based wellbore fluid having a surface area loading factor of at least 2,000 lbm 2 /gbbl and a conductivity of at most 0.01 S/m when measured at 20 kHz, within the wellbore while drilling the wellbore with a drill bit on a drill string;
applying electrical current from a logging tool on the drill string above the drill bit; and
collecting an electrical log of the portion of the wellbore that has had electrical current applied thereto.

2. The method of claim 1 , wherein the electrical current is applied continuously as the wellbore is drilled by the drill bit.

3. The method of claim 1 , further comprising:
transmitting the electrical log to the surface.

4. The method of claim 1 , wherein the electrical current is applied from the logging tool by at least one electrode thereon.

5. The method of claim 1 , wherein the carbon material is a carbon black that has spheroidal primary particles from about 5 nm to about 150 nm in diameter.

6. The method of claim 1 , wherein the carbon material is a carbon black wherein a circumscribing sphere encompassing a carbon black aggregate has a diameter from about 60 nanometers to 3 micrometers.

7. The method of claim 1 , wherein the carbon material is a carbon black having a pore volume of at least about 200 cm 3 DBP/100 g carbon black and up to about 500 cm 3 DBP/100 g carbon black.

8. The method of claim 1 , wherein the carbon material is a carbon black having a volatile content below about 1% by weight.

9. The method of claim 1 , wherein the carbon material is present in the wellbore fluid in an amount of about 1 to 30 pounds per barrel.

10. The method of claim 1 , wherein the oil-based wellbore fluid is an invert emulsion.

11. A system for electrically logging a section of a wellbore, comprising:
a wellbore containing an oil-based wellbore fluid comprising a conductive carbon material therein, wherein the carbon material is a carbon black having a pore volume of at least about 200 cm 3 DBP/100 g carbon black and up to about 500 cm 3 DBP/100 g carbon black, and wherein the oil-based wellbore fluid has a conductivity of at most 0.01 S/m when measured at 20 kHz; and
a logging tool capable of applying an electrical current to a portion of the wellbore on a drill string above the drill bit, the drill string being in the wellbore.

12. The system of claim 11 , wherein the electrical current is applied from the logging tool by at least one electrode thereon.

13. The system of claim 11 , wherein the oil-based wellbore fluid has a surface area loading factor of at least 2,000 lbm 2 /gbbl.

14. The system of claim 11 , wherein the carbon material is a carbon black that has spheroidal primary particles from about 5 nm to about 150 nm in diameter.

15. The system of claim 11 , wherein the carbon material is a carbon black wherein a circumscribing sphere encompassing a carbon black aggregate has a diameter from about 60 nanometers to 3 micrometers.

16. The system of claim 11 , wherein the carbon material is a carbon black having a volatile content below about 1% by weight.

17. The system of claim 11 , wherein the carbon material is present in the wellbore fluid in an amount of about 1 to 30 pounds per barrel.

18. The system of claim 11 , wherein the oil-based wellbore fluid is an invert emulsion.

19. A method of electrically logging a section of a wellbore, comprising:
circulating an oil-based wellbore fluid within the wellbore while drilling the wellbore with a drill bit on a drill string, wherein the oil-based wellbore fluid comprises a conductive carbon material therein, wherein the carbon material is a carbon black having a pore volume of at least about 200 cm 3 DBP/100 g carbon black and up to about 500 cm 3 DBP/100 g carbon black, and wherein the oil-based wellbore fluid has a conductivity of at most 0.01 S/m when measured at 20 kHz;
applying electrical current from a logging tool on the drill string above the drill bit; and
collecting an electrical log of the portion of the wellbore that has had electrical current applied thereto.

20. A method of electrically logging a section of a wellbore, comprising:
circulating an oil-based wellbore fluid within the wellbore while drilling the wellbore with a drill bit on a drill string, wherein the oil-based wellbore fluid comprises a conductive carbon material therein, wherein the carbon material is a carbon black having a volatile content below about 1% by weight, and wherein the oil-based wellbore fluid has a conductivity of at most 0.01 S/m when measured at 20 kHz;
applying electrical current from a logging tool on the drill string above the drill bit; and
collecting an electrical log of the portion of the wellbore that has had electrical current applied thereto.

21. A system for electrically logging a section of a wellbore, comprising:
a wellbore containing an oil-based wellbore fluid comprising a conductive carbon material therein, wherein the oil-based wellbore fluid has a surface area loading factor of at least 2,000 lbm 2 /gbbl and a conductivity of at most 0.01 S/m when measured at 20 kHz; and
a logging tool capable of applying an electrical current to a portion of the wellbore on a drill string above the drill bit, the drill string being in the wellbore.

22. A system for electrically logging a section of a wellbore, comprising:
a wellbore containing an oil-based wellbore fluid comprising a conductive carbon material therein, wherein the carbon material is a carbon black having a volatile content below about 1% by weight, and wherein the oil-based wellbore fluid has a conductivity of at most 0.01 S/m when measured at 20 kHz; and
a logging tool capable of applying an electrical current to a portion of the wellbore on a drill string above the drill bit, the drill string being in the wellbore.

Assignees

• Mi Llc
• Schlumberger Technology Corp

Inventors

• Price Hoelscher Brandi Katherine
• Bovet Cara
• Okhrimenko Albert

Classifications

• C09K8/34 Primary

  Organic liquids · CPC title

• C09K8/032 Primary

  Inorganic additives · CPC title

• G01V3/20

  operating with propagation of electric current · CPC title

• C09K8/32

  Non-aqueous well-drilling compositions, e.g. oil-based · CPC title

• E21B49/00 Primary

  Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells · CPC title