Drilling fluid for downhole electrocrushing drilling

Patent metadata

Field	Value
Publication number	US-11319475-B2
Application number	US-202016898068-A
Country	US
Kind code	B2
Filing date	Jun 10, 2020
Priority date	Jun 16, 2016
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

The disclosure relates to an electrocrushing drilling fluid with an electrocrushing drilling base fluid including a non-polar oil, water, and glycerin. The base fluid may further include a polar oil and an alkylene carbonate. The electrocrushing drilling fluid may further contain at least one additive. The electrocrushing drilling fluid may have a dielectric constant or dielectric strength of at least a set amount, an electric conductivity less than a set amount, or a combination of these properties. The disclosure further relates to an electrocrushing drilling system containing the electrocrushing drilling fluid and an electrocrushing drill bit.

First claim

What is claimed is:

1. An electrocrushing drilling fluid comprising a electrocrushing drilling base fluid comprising at least water, an alkylene carbonate, and a polar oil, wherein the electrocrushing drilling base fluid has a dielectric constant of at least 6 at 100 kHz frequency.

2. The electrocrushing drilling fluid of claim 1 further comprising non-polar oil, glycerin, or a combination thereof.

3. The electrocrushing drilling fluid of claim 1 , wherein the electrocrushing drilling base fluid has a dielectric strength of at least 100 kV/cm at 10 microseconds rise time.

4. The electrocrushing drilling fluid of claim 1 , wherein the electrocrushing drilling base fluid has an electric conductivity of less than 10 −4 mho/cm.

5. The electrocrushing drilling fluid of claim 1 , wherein the electrocrushing drilling base fluid has an oil:water ratio between 50:50 and 99:1 (v:v).

6. The electrocrushing drilling fluid of claim 1 , wherein the polar oil comprises a vegetable oil, an ester oil, or any combinations thereof.

7. The electrocrushing drilling fluid of claim 1 , wherein the alkylene carbonate comprises butylene carbonate, propylene carbonate, or any combinations thereof.

8. The electrocrushing drilling fluid of claim 1 , wherein the non-polar oil comprises a mineral oil, a diesel oil or fuel, a paraffin-based oil, an oil containing branched and linear aliphatic hydrocarbons having between 8 and 26 carbon atoms and a boiling point in the range of 120° C. to 380° C., an oil containing hydrocarbons having between 10 and 16 carbon atoms and a viscosity of 1.5 to 2 cSt at 40° C., or any combinations thereof.

9. The electrocrushing drilling fluid of claim 1 , further comprising at least one additive comprising an electrical additive, a lost circulation material, a rheology modifier, a weighting agent, an emulsifier, a corrosion inhibitor, a defoamer, a shale stabilizer, a lubricant, a wetting agent, a dispersing agent, a shale inhibitor, a pH-control agent, a filtration-control agent, an alkalinity source, or any combinations thereof.

10. The electrocrushing drilling fluid of claim 1 , wherein the electrocrushing drilling fluid has a dielectric constant of at least 13 at 100 kHz.

11. The electrocrushing drilling fluid of claim 1 , wherein the electrocrushing drilling fluid has a dielectric constant of at least 10 at 100 kHz.

12. The electrocrushing drilling fluid of claim 1 , wherein the electrocrushing base fluid has a polar oil:alkylene carbonate ratio between 75:25 to 85:15.

13. The electrocrushing drilling fluid of claim 1 , wherein the electrocrushing base fluid has a glycerine:polar oil and alkylene carbonate ratio between 5:95 and 15:85.

14. The electrocrushing drilling fluid of claim 1 , wherein the water:glycerine ratio is between 25:75 and 35:65.

Assignees

• Halliburton Energy Services Inc
• Chevron Usa Inc

Inventors

• Van Slyke Donald Curtis
• Shumway William Walter

Classifications

• C10M2207/401

  used as base material · CPC title

• C10M2207/2805

  used as base material · CPC title

• C09K2208/32

  Anticorrosion additives · CPC title

• C10M2201/103

  Clays; Mica; Zeolites · CPC title

• C10M2215/04

  having amino groups bound to acyclic or cycloaliphatic carbon atoms · CPC title