Drilling fluid lubricants

Patent metadata

Field	Value
Publication number	US-11814569-B2
Application number	US-202217655518-A
Country	US
Kind code	B2
Filing date	Mar 18, 2022
Priority date	Mar 19, 2021
Publication date	Nov 14, 2023
Grant date	Nov 14, 2023

Abstract

A drilling fluid may include a carrier and a lubricant composition. The lubricant composition includes ethylene bottoms heavy pyrolysis oil. For example, the heavy pyrolysis oil may be bottoms of a fractionated fuel oil product separated from ethylene gas produced by a cracking of a hydrocarbon feedstock in a furnace.

First claim

We claim:

1. A drilling fluid comprising:
a carrier selected from a water-based carrier and an oil-based carrier; and
a lubricant composition present in a range of from 0.1% to 5.0% by weight of the drilling fluid,
wherein the lubricant composition comprises ethylene bottoms heavy pyrolysis oil comprising from 75% to 80% by weight of petroleum hydrocarbons.

2. The drilling fluid of claim 1 , wherein the heavy pyrolysis oil comprises bottoms from a hydrocarbon feedstock steam cracker furnace comprising one or more of ethane, propane, butane, liquefied petroleum gas (LPG), natural gas liquids (NGL), light (C 2 -C 5 ) hydrocarbons, or naphtha (C 6 -C 10 ).

3. The drilling fluid of claim 1 , wherein the heavy pyrolysis oil comprises:
naphthalene in a range of from 10% to 30% by weight,
biphenyl in a range of from 1% to 10% by weight,
phenanthrene in a range of from 1% to 10% by weight, and
anthracene in a range of from 1% to 10% by weight.

4. The drilling fluid of claim 1 , wherein the heavy pyrolysis oil comprises:
less than 1000 ppm of C 1 to C 6 organic compounds,
less than 1000 ppm of C 7 to C 8 organic compounds,
about 500 ppm of C 9 to C 10 organic compounds,
from about 15,000 ppm to about 35,000 ppm of C 11 to C 12 organic compounds,
from about 250,000 ppm to about 450,000 ppm of C 13 to C 16 organic compounds,
from about 150,000 ppm to about 350,000 ppm of C 17 to C 21 organic compounds,
from about 50,000 ppm to about 150,000 ppm of C 22 to C 35 organic compounds, and
from about 20,000 ppm to about 70,000 ppm of C n organic compounds, wherein n>35.

5. The drilling fluid of claim 1 , wherein the lubricant composition further comprises a non-ionic surfactant present in a range of from 1% to 20% by weight of the lubricant composition.

6. The drilling fluid of claim 5 , wherein the surfactant comprises an ethoxylated mercaptan.

7. The drilling fluid of claim 1 , wherein the lubricant composition is present in a range of more than 1.0% by weight and less than 5.0% by weight of the drilling fluid.

8. The drilling fluid of claim 1 , wherein the lubricant composition further comprises an asphalt sulfonate salt in a concentration of from 15% to 30% by weight of the lubricant composition.

9. The drilling fluid of claim 1 , wherein the coefficient of friction of the drilling fluid is 0.60 or lower.

10. The drilling fluid of claim 1 , wherein the coefficient of friction of the drilling fluid is less than 50% of the coefficient of friction of a similar drilling fluid without the lubricant composition.

11. The drilling fluid of claim 1 , wherein the coefficient of friction of the drilling fluid is in a range of from 0.01 to 0.20 at a pressure of 100 pounds per square inch.

12. The drilling fluid of claim 1 , wherein the lubricant composition comprises a surfactant, and wherein the coefficient of friction of the drilling fluid is in a range of from 0.40 to 0.60 at a pressure of 600 pounds per square inch.

13. The drilling fluid of claim 1 , wherein the lubricant composition comprises an asphalt sulfonate salt, and wherein the coefficient of friction of the drilling fluid is in a range of from 0.01 to 0.10 at a pressure of 100 pounds per square inch.

14. The drilling fluid of claim 1 , wherein the drilling fluid does not exhibit saponification in a Bakken brine or in a calcium chloride-based brine.

15. The drilling fluid of claim 14 , wherein the drilling fluid has a pH of 11.0 or lower.

16. A lubricant composition for a drilling fluid, the lubricant composition comprising:
an ethylene bottoms heavy pyrolysis oil comprising from 75% to 80% by weight of petroleum hydrocarbons; and
one or both of
a) an asphalt sulfonate salt in a concentration of from 15% to 30% by weight of the lubricant composition; or
b) a non-ionic surfactant present in a range of from 1% to 20% by weight of the lubricant composition.

17. The lubricant composition of claim 16 , wherein the surfactant comprises an ethoxylated mercaptan.

18. The lubricant composition of claim 16 , wherein the heavy pyrolysis oil consists essentially of bottoms from a hydrocarbon feedstock steam cracker furnace comprising one or more of ethane, propane, butane, liquefied petroleum gas (LPG), natural gas liquids (NGL), light (C 2 -C 5 ) hydrocarbons, or naphtha (C 6 -C 10 ).

19. The lubricant composition of claim 16 , wherein the heavy pyrolysis oil comprises:
naphthalene in a range of from 10% to 30% by weight,
biphenyl in a range of from 1% to 10% by weight,
phenanthrene in a range of from 1% to 10% by weight, and
anthracene in a range of from 1% to 10% by weight.

20. The lubricant composition of claim 16 , wherein the heavy pyrolysis oil comprises:
less than 1000 ppm of C 1 to C 6 organic compounds,
less than 1000 ppm of C 7 to C 8 organic compounds,
about 500 ppm of C 9 to C 10 organic compounds,
from about 15,000 ppm to about 35,000 ppm of C 11 to C 12 organic compounds,
from about 250,000 ppm to about 450,000 ppm of C 13 to C 16 organic compounds,
from 150,000 ppm to about 350,000 ppm of C 17 to C 21 organic compounds,
from about 50,000 ppm to about 150,000 ppm of C 22 to C 35 organic compounds, and
from about 20,000 ppm to about 70,000 ppm of C n organic compounds, wherein n>35.

Assignees

• Chevron Phillips Chemical Co Lp

Inventors

• Watson Elan
• Jackson Christopher B
• Bishop Marshall D

Classifications

• C09K8/035 Primary

  Organic additives · CPC title

• C09K8/08

  containing natural organic compounds, e.g. polysaccharides, or derivatives thereof · CPC title

• C09K8/24

  Polymers · CPC title

• C09K8/34

  Organic liquids · CPC title

• E21B21/00

  Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (freeing objects stuck in boreholes by flushing E21B31/03) · CPC title